Abstrict A measurement system (200) is disclosed comprising a Coriolis flow
meter (222) and a control system (224). A base fluid (250) is first
flowed through the Coriolis flow meter. The Coriolis flow meter
measures a density of the base fluid and transmits a base fluid
density measurement to the control system. A proppant (252) is then
added to the base fluid to create a fracture fluid (202). The fracture
fluid is then flowed through the Coriolis flow meter. The Coriolis
flow meter measures a density of the fracture fluid and transmits
a fracture fluid density measurement to the control system. The
control system determines an amount of proppant in the fracture
fluid based on the base fluid density measurement, the fracture
fluid density measurement, and a density of the proppant.
Claims 1. A measurement system comprising a Coriolis flow meter and a
control system, said measurement system characterized by: said Coriolis
flow meter being configured to measure a density of a base fluid
flowing through said Coriolis flow meter to generate a base fluid
density measurement, transmit said base fluid density measurement,
measure a density of a fracture fluid flowing through said Coriolis
flow meter to generate a fracture fluid density measurement, wherein
said fracture fluid comprises a mixture of said base fluid and a
proppant, and transmit said fracture fluid density measurement;
and said control system being configured to receive said base fluid
density measurement and said fracture fluid density measurement,
and determine an amount of said proppant in said fracture fluid
based on said base fluid density measurement, said fracture fluid
density measurement, and a density of said proppant.
2. The measurement system of claim 1 wherein said Coriolis flow
meter comprises a straight tube Coriolis flow meter.
3. The measurement system of claim 1 wherein said Coriolis flow
meter is configured to receive a slip stream of said fracture fluid
to measure said density of said fracture fluid.
4. The measurement system of claim 1 further comprising: a first
tube having a first end configured to connect to an input of said
Coriolis flow meter and having a second end configured to connect
to a discharge of a tank; and a second tube having a first end configured
to connect to an output of said Coriolis flow meter and having a
second end configured to connect to said tank; wherein said first
tube is configured to receive a slip stream of material from said
discharge of said tank, said slip stream travels through said first
tube, through said Coriolis flow meter, through said second tube,
and back into said tank.
5. The measurement system of claim 1 wherein said control system
is configured to determine said density of said proppant.
6. The measurement system of claim 1 wherein said control system
comprises: a display system configured to provide said amount of
said proppant to a user.
7. The measurement system of claim 1 wherein said control system
comprises: an auxiliary interface configured to transmit a signal
representing said amount of said proppant to an auxiliary system.
8. The measurement system of claim 1 wherein said control system
comprises: a user interface configured to receive said density of
said proppant entered by a user.
9. The measurement system of claim 1 wherein said control system
(is configured to: calculate a velocity of said fracture fluid;
determine if said velocity of said fracture fluid exceeds a threshold;
and provide an indication if said velocity of said fracture fluid
exceeds said threshold.
10. The measurement system of claim 1 wherein said control system
is configured to: calculate an average density of said base fluid
based on a plurality of density measurements of said base fluid
by said Coriolis flow meter; and determine said amount of said proppant
in said fracture fluid based on said average density of said base
fluid, said fracture fluid density measurement, and said density
of said proppant.
11. The measurement system of claim 1 wherein: said Coriolis flow
meter is configured to measure a mass flow rate of said fracture
fluid, and provide at least one of said mass flow rate of said fracture
fluid and a drive gain of said Coriolis flow meter to said control
system; and said control system is configured to provide at least
one of said mass flow rate of said fracture fluid and said drive
gain of said Coriolis flow meter to a user.
12. A method of measuring an amount of proppant in a fracture fluid,
said method comprising the step of: determining a density of said
proppant; said method characterized by the steps of: measuring a
density of a base fluid with a Coriolis flow meter to generate a
base fluid density measurement; measuring a density of a fracture
fluid with said Coriolis flow meter to generate a fracture fluid
density measurement, wherein said fracture fluid comprises a mixture
of said base fluid and a proppant; and determining an amount of
said proppant in said fracture fluid based on said base fluid density
measurement, said fracture fluid density measurement, and said density
of said proppant.
13. The method of claim 12 wherein the step of measuring a density
of a fracture fluid with said Coriolis flow meter comprises: measuring
said density of said fracture fluid with a straight tube Coriolis
flow meter
14. The method of claim 12 wherein the step of measuring a density
of a fracture fluid with said Coriolis flow meter comprises: receiving
a slip stream of said fracture fluid into said Coriolis flow meter
to measure said density of said fracture fluid.
15. The method of claim 12 further comprising the steps of: connecting
a first end of a first tube to an input of said Coriolis flow meter;
connecting a second end of said first tube to a discharge of a tank
connecting a first end of a second tube to an output of said Coriolis
flow meter; and connecting a second end of said second tube to said
tank; wherein said first tube receives a slip stream of material
from said discharge of said tank, said slip stream travels through
said first tube, through said Coriolis flow meter, through said
second tube, and back into said tank.
16. The method of claim 12 further comprising the step of: providing
said amount of said proppant to a user.
17. The method of claim 12 further comprising the step of: transmitting
a signal representing said amount of said proppant to an auxiliary
system.
18. The method of claim 12 further comprising the step of: receiving
said density of said proppant from a user.
19. The method of claim 12 further comprising the steps of: calculating
a velocity of said fracture fluid; determining if said velocity
of said fracture fluid exceeds a threshold; and providing an indication
if said velocity of said fracture fluid exceeds said threshold.
20. The method of claim 12 further comprising the steps of: calculating
an average density of said base fluid based on a plurality of density
measurements of said base fluid by said Coriolis flow meter; and
determining said amount of said proppant in said fracture fluid
based on said average density of said base fluid, said fracture
fluid density measurement, and said density of said proppant.
21. The method of claim 12 further comprising the steps of: measuring
a mass flow rate of said fracture fluid with said Coriolis flow
meter; and providing at least one of said mass flow rate of said
fracture fluid and a drive gain of said Coriolis flow meter to a
user.
Description BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention is related to the field of measurement systems,
and in particular, to a system and method that use measurements
from a Coriolis flow meter to determine the amount of proppant in
a fracture fluid.
[0003] 2. Statement of the Problem
[0004] Oil, gas, and other resources under ground are obtained
by drilling a well. The well is drilled to a certain depth and cased
in cement. The well extends through multiple zones in the ground
that a drilling crew may wish to tap. To tap into a certain zone,
the drilling crew fractures a portion of the casing in the desired
zone. The fracturing process used could be hydraulic fracturing,
pneumatic fracturing, or another type of fracturing. With the casing
fractured, the drilling crew then pumps a fracture fluid into the
fracture to keep the fracture open. The fracture fluid holds the
fracture open while still being permeable. This enables the oil
and gas to more easily flow through the fracture into the well-bore.
[0005] The fracture fluid is made up of a base fluid and a proppant.
To make the base fluid, a Guar gum is added to water in a large
tank. A mixer within the tank continually mixes the Guar gum and
the water together to make the base fluid. When mixed, the base
fluid has the consistency somewhat like molasses.
[0006] A proppant, such as sand, is then added to the base fluid
in the tank to make the fracture fluid. The amount of sand added
depends on soil type, soil conditions, and other factors. The mixer
in the tank mixes the base fluid and the sand together to make the
fracture fluid. The fracture fluid is then pumped into the well-bore
to help keep the fracture open. The amount of the sand in the fracture
fluid determines how well the fracture fluid is able to hold the
fracture open.
[0007] Because the amount of sand in the fracture fluid is important,
the drilling crew may want to measure the amount of sand added.
This can be a difficult process because the fracture fluid is usually
not made in a batch, but is continuously mixed. To determine the
amount of sand in the fracture fluid, the drilling crew uses a nuclear
densitometer to measure the density of the fracture fluid being
pumped into the well-bore. A controller receives the density measurement
from the nuclear densitometer and calculates the amount of sand
added to the fracture fluid. The drilling crew can then adjust the
amount of sand to a desired level. An example of a system for providing
the fracture fluid is described below and illustrated in FIG. 1.
[0008] Unfortunately, there are problems associated with using
nuclear densitometers. For instance, interstate and international
transport of nuclear densitometers can be a difficult process considering
the laws and regulations surrounding nuclear technology. There are
also concerns for safe handling and transporting of the nuclear
densitometers. The operators of the nuclear densitometers have to
be certified or licensed by the proper regulatory agency. Such factors
make nuclear densitometers undesirable to use.
[0009] Coriolis flow meters are used to measure the mass flow rate,
density, and other information for fluids. Exemplary Coriolis flow
meters are disclosed in U.S. Pat. No. 4109524 of Aug. 29 1978
U.S. Pat. No. 4491025 of Jan. 1 1985 and Re. 31450 of Feb.
11 1982 all to J. E. Smith et al. Coriolis flow meters are comprised
of one or more flow tubes of a straight or curved configuration.
Each flow tube configuration in a Coriolis flow meter has a set
of natural modes of vibration, which may be of a simple bending,
twisting, torsional, or coupled type. Each flow tube is driven to
oscillate at resonance in one of these natural modes of vibration.
Fluid flows into the flow meter from a connected pipeline on the
inlet side of the flow meter. The fluid is directed through the
flow tube(s), and exits the flow meter through the outlet side of
the flow meter. The natural vibration modes of the vibrating, fluid-filled
system are defined in part by the combined mass of the flow tubes
and the mass of the fluid flowing through the flow tubes.
[0010] As fluid begins to flow through the flow tubes, Coriolis
forces cause points along the flow tubes to have a different phase.
The phase on the inlet side of the flow tube commonly lags the driver
while the phase on the outlet side of the flow tube leads the driver.
Pickoffs are affixed to the flow tube(s) to measure the motion of
the flow tube(s) and generate pickoff signals that are representative
of the motion of the flow tube(s).
[0011] Meter electronics, or any other ancillary electronics or
circuitry connected to the flow meter, receive the pickoff signals.
The meter electronics processes the pickoff signals to determine
the phase difference between the pickoff signals. The phase difference
between two pickoff signals is proportional to the mass flow rate
of the fluid through the flow tube(s). The meter electronics can
also process one or both of the pickoff signals to determine the
density of the fluid.
[0012] Unfortunately, Coriolis flow meters have not been used to
measure the density of a fracture fluid. First, the fracture fluid
is usually pumped down the well-bore through a large tube, such
as an eight inch tube. Coriolis flow meters have not been built
large enough to measure an eight inch stream. Secondly, most Coriolis
flow meters have curved flow tubes. The erosive properties of sand
through the curved flow tubes prevents the curved-tube Coriolis
flow meter from being a viable option. The sand would damage the
flow tubes in a matter of hours. For these reasons, Coriolis flow
meters have not been used to measure the fracture fluid, and nuclear
densitometers continue to be used.
SUMMARY OF THE SOLUTION
[0013] The invention helps solve the above problems with a measurement
system comprising a Coriolis flow meter and a control system. A
base fluid is first flowed through the Coriolis flow meter. The
Coriolis flow meter measures a density of the base fluid and transmits
a base fluid density measurement to the control system. A proppant
is added to the base fluid creating a fracture fluid. The fracture
fluid is then flowed through the Coriolis flow meter. The Coriolis
flow meter measures a density of the fracture fluid and transmits
a fracture fluid density measurement to the control system. The
control system determines an amount of proppant in the fracture
fluid based on the base fluid density measurement, the fracture
fluid density measurement, and a density of the proppant.
[0014] The measurement system advantageously replaces nuclear technology
with Coriolis technology. Coriolis flow meters can provide accurate
density measurements, while avoiding the problems of handling and
transporting radioactive sources and instruments. Coriolis flow
meters also do not have the intrinsic safety concerns of the nuclear
densitometer.
[0015] In another example of the invention, the Coriolis flow meter
is configured to receive a slip stream of material. To provide the
slip stream, the measurement system further comprises a first tube
and a second tube. The first tube has a first end configured to
connect to an input of the Coriolis flow meter and has a second
end configured to connect to a discharge of a tank. The second tube
has a first end configured to connect to an output of the Coriolis
flow meter and has a second end configured to connect to a tank.
The first tube receives a slip stream of material from the discharge
of the tank. The slip stream travels through said first tube, through
said Coriolis flow meter, through said second tube, and back into
said tank. The slip stream advantageously provides a smaller flow
to measure, such as a one inch flow.
[0016] Other examples of the invention may be disclosed below.
[0017] The following sets forth aspects of the invention. One aspect
of the invention comprises a measurement system comprising a Coriolis
flow meter and a control system,
[0018] said measurement system characterized by: [0019] said Coriolis
flow meter being configured to measure a density of a base fluid
(250) flowing through said Coriolis flow meter to generate a base
fluid density measurement, transmit said base fluid density measurement,
measure a density of a fracture fluid (202) flowing through said
Coriolis flow meter to generate a fracture fluid density measurement,
wherein said fracture fluid comprises a mixture of said base fluid
and a proppant (252), and transmit said fracture fluid density measurement;
and [0020] said control system being configured to receive said
base fluid density measurement and said fracture fluid density measurement,
and determine an amount of said proppant in said fracture fluid
based on said base fluid density measurement, said fracture fluid
density measurement, and a density of said proppant.
[0021] Preferably, the Coriolis flow meter comprises a straight
tube Coriolis flow meter.
[0022] Preferably, the Coriolis flow meter is configured to receive
a slip stream of said fracture fluid to measure said density of
said fracture fluid.
[0023] Preferably, the measurement system further comprises:
[0024] a first tube having a first end configured to connect to
an input of said Coriolis flow meter and having a second end configured
to connect to a discharge of a tank; and
[0025] a second tube having a first end configured to connect to
an output of said Coriolis flow meter and having a second end configured
to connect to said tank;
[0026] wherein said first tube is configured to receive a slip
stream of material from said discharge of said tank, said slip stream
travels through said first tube, through said Coriolis flow meter,
through said second tube, and back into said tank.
[0027] Preferably, the control system is configured to determine
said density of said proppant.
[0028] Preferably, the control system comprises a display system
configured to provide said amount of said proppant to a user.
[0029] Preferably, the control system comprises an auxiliary interface
configured to transmit a signal representing said amount of said
proppant to an auxiliary system.
[0030] Preferably, the control system comprises a user interface
configured to receive said density of said proppant entered by a
user.
[0031] Preferably, the control system is configured to:
[0032] calculate a velocity of said fracture fluid;
[0033] determine if said velocity of said fracture fluid exceeds
a threshold; and
[0034] provide an indication if said velocity of said fracture
fluid exceeds said threshold.
[0035] Preferably, the control system is configured to:
[0036] calculate an average density of said base fluid based on
a plurality of density measurements of said base fluid by said Coriolis
flow meter; and
[0037] determine said amount of said proppant in said fracture
fluid based on said average density of said base fluid, said fracture
fluid density measurement, and said density of said proppant.
[0038] Preferably, the Coriolis flow meter is configured to measure
a mass flow rate of said fracture fluid, and provide at least one
of said mass flow rate of said fracture fluid and a drive gain of
said Coriolis flow meter to said control system; and
[0039] said control system is configured to provide at least one
of said mass flow rate of said fracture fluid and said drive gain
of said Coriolis flow meter to a user.
[0040] Another aspect of the invention comprises a method of measuring
an amount of proppant in a fracture fluid, said method comprising
the step of:
[0041] determining a density of said proppant;
[0042] said method characterized by the steps of: [0043] measuring
a density of a base fluid with a Coriolis flow meter to generate
a base fluid density measurement; [0044] measuring a density of
a fracture fluid with said Coriolis flow meter to generate a fracture
fluid density measurement, wherein said fracture fluid comprises
a mixture of said base fluid and a proppant; and [0045] determining
an amount of said proppant in said fracture fluid based on said
base fluid density measurement, said fracture fluid density measurement,
and said density of said proppant.
[0046] Preferably, the step of measuring a density of a fracture
fluid with said Coriolis flow meter comprises:
[0047] measuring said density of said fracture fluid with a straight
tube Coriolis flow meter.
[0048] Preferably, the step of measuring a density of a fracture
fluid with said Coriolis flow meter comprises:
[0049] receiving a slip stream of said fracture fluid into said
Coriolis flow meter to measure said density of said fracture fluid.
[0050] Preferably, the method further comprises the steps of:
[0051] connecting a first end of a first tube to an input of said
Coriolis flow meter;
[0052] connecting a second end of said first tube to a discharge
of a tank;
[0053] connecting a first end of a second tube to an output of
said Coriolis flow meter; and
[0054] connecting a second end of said second tube to said tank;
[0055] wherein said first tube receives a slip stream of material
from said discharge of said tank, said slip stream travels through
said first tube, through said Coriolis flow meter, through said
second tube, and back into said tank.
[0056] Preferably, the method further comprises the step of providing
said amount of said proppant to a user.
[0057] Preferably, the method further comprises the step of transmitting
a signal representing said amount of said proppant to an auxiliary
system.
[0058] Preferably, the method further comprises the step of receiving
said density of said proppant from a user.
[0059] Preferably, the method further comprises the steps of:
[0060] calculating a velocity of said fracture fluid;
[0061] determining if said velocity of said fracture fluid exceeds
a threshold; and
[0062] providing an indication if said velocity of said fracture
fluid exceeds said threshold.
[0063] Preferably, the method further comprises the steps of:
[0064] calculating an average density of said base fluid based
on a plurality of density measurements of said base fluid by said
Coriolis flow meter; and
[0065] determining said amount of said proppant in said fracture
fluid based on said average density of said base fluid, said fracture
fluid density measurement, and said density of said proppant.
[0066] Preferably, the method further comprises the steps of:
[0067] measuring a mass flow rate of said fracture fluid with said
Coriolis flow meter; and
[0068] providing at least one of said mass flow rate of said fracture
fluid and a drive gain of said Coriolis flow meter to a user.
DESCRIPTION OF THE DRAWINGS
[0069] The same reference number represents the same element on
all drawings.
[0070] FIG. 1 illustrates a system for supplying a fracture fluid
to a well-bore in the prior art.
[0071] FIG. 2 illustrates a measurement system in an example of
the invention.
[0072] FIG. 3 illustrates an example of a control system in an
example of the invention.
[0073] FIG. 4 illustrates an example of a Coriolis flow meter in
an example of the invention.
[0074] FIG. 5 is a flow chart illustrating an example operation
of a measurement system in an example of the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0075] FIG. 1 illustrates a system for supplying a fracture fluid
to a well-bore in the prior art to assist in understanding the invention.
FIGS. 2-5 and the following description depict specific examples
of the invention to teach those skilled in the art how to make and
use the best mode of the invention. For the purpose of teaching
inventive principles, some conventional aspects of the invention
have been simplified or omitted. Those skilled in the art will appreciate
variations from these examples that fall within the scope of the
invention. Those skilled in the art will appreciate that the features
described below can be combined in various ways to form multiple
variations of the invention. As a result, the invention is not limited
to the specific examples described below, but only by the claims
and their equivalents.
System for Supplying a Fracture Fluid in the Prior Art--FIG. 1
[0076] FIG. 1 illustrates a fracture fluid system 100 for supplying
a fracture fluid 102 to a well-bore in the prior art. Fracture fluid
system 100 is comprised of a tank/mixer 110 a recirculation tube
111 a supply tube 112 a discharge tube 118 a valve 113 a pump
128 a nuclear densitometer 114 and a controller 116. Discharge
tube 118 is connected to tank/mixer 110 at one end and valve 113
at the other. Pump 128 and nuclear densitometer 114 are connected
to discharge tube 118. Recirculation tube 111 is connected to valve
113 at one end and tank/mixer 110 at the other. Supply tube 112
is connected to valve 113 and is configured to transport the fracture
fluid 102 to the well-bore. Valve 113 either directs a flow of the
fracture fluid 102 through recirculation tube 111 or through supply
tube 112. Supply tube 112 recirculation tube 111 and discharge
tube 118 have at least eight inch diameters. Controller 116 is coupled
to nuclear densitometer 114.
[0077] In operation, water 120 gum 122 and sand 124 are added
to tank/mixer 110. Tank/mixer 110 mixes the water 120 the gum 122
and the sand 124 together to make the fracture fluid 102. The amount
of sand added to the water 120 and the gum 122 in the fracture fluid
102 depends on the soil type, soil conditions, and other factors.
The operator of fracture fluid system 100 uses nuclear densitometer
114 and controller 116 to measure the amount of sand in the fracture
fluid 102.
[0078] As the full stream of the fracture fluid 102 flows through
discharge tube 118 nuclear densitometer 114 measures the density
of the fracture fluid 102. Nuclear densitometer 114 transmits the
density measurement to controller 116. Controller 116 knows the
density of the sand 124 the density of the water 120 and the density
of the gum 122. These values may be entered into controller 116
by the operator. Controller 116 calculates the amount of sand in
the fracture fluid 102 based on the density measurement of the fracture
fluid 102 and the known densities of the sand 124 the water 120
and the gum 122. Controller 116 includes a display 136. Controller
116 provides the amount of sand in the fracture fluid 102 to the
operator using display 136.
[0079] As described above, there are many problems associated with
using nuclear densitometer 114. For instance, interstate and international
transport of nuclear densitometers can be a difficult process, safe
handling and transporting of the nuclear densitometers is a concern,
and the people operating the nuclear densitometers have to be certified
or licensed by the proper regulatory agency. Such factors make nuclear
densitometers undesirable to use.
Measurement System and Operation--FIG. 2
[0080] FIG. 2 illustrates a measurement system 200 in an example
of the invention. Measurement system 200 is configured to operate
with a fracture fluid system 201 for supplying a fracture fluid
202 to a well-bore (not shown). Fracture fluid system 201 is comprised
of a tank/mixer 210 a discharge tube 218 a valve 213 a recirculation
tube 211 a supply tube 212 a pump 228 and measurement system
200. Discharge tube 218 is connected to tank/mixer 210 at one end
and valve 213 at the other. Pump 228 is also connected to discharge
tube 218. Recirculation tube 211 is connected to valve 213 at one
end and tank/mixer 210 at the other. Supply tube 212 is connected
to valve 213 and is configured to transport the fracture fluid 202
to the well-bore. Valve 213 either directs a flow of material through
recirculation tube 211 or through supply tube 212. Fracture fluid
system 201 may be comprised of many other components that are not
shown for the sake of brevity.
[0081] Measurement system 200 is comprised of a Coriolis flow meter
222 and a control system 224. Measurement system 200 may also include
tubes 226-227 that form a slip stream from discharge tube 218. Tubes
226-227 may be one inch rubber tubing. Tube 226 includes ends 271
and 272. End 271 connects to an inlet end of Coriolis flow meter
222. End 272 connects to discharge tube 218. End 272 may connect
to an elbow of discharge tube 218 to obtain the best results. Tube
227 includes ends 281 and 282. End 281 connects to an outlet end
of Coriolis flow meter 222 and end 282 connects to tank/mixer 210.
Tube 226 Coriolis flow meter 222 and tube 227 are configured to
receive a slip stream 280 of material. The slip stream 280 enters
tube 226 and passes through tube 226 through Coriolis flow meter
222 through tube 227 and back into tank/mixer 210.
[0082] The following definitions may be helpful in understanding
the invention. A Coriolis flow meter comprises any meter configured
to measure a density of a material based on the Coriolis principle.
An example of a Coriolis flow meter is a Model T-100 straight tube
meter manufactured by Micro Motion Inc. of Boulder, Colo. A fracture
fluid comprises any fluid, material, or mixture used to resist crushing
of a fracture in a well-bore and provide a permeable path. A proppant
comprises any material or agent used in a fracture fluid to help
keep the fractures open. An example of a proppant is sand. A base
fluid comprises any material or agent mixed with a proppant to form
a fracture fluid. A tank or tank/mixer comprises any tub or container
that stores a material. A tube comprises any hose, tubing, line,
pipe, etc.
[0083] In operation, tank/mixer 210 receives and mixes the base
fluid 250. Based on the setting of valve 213 pump 228 circulates
the base fluid 250 through discharge tube 218 and recirculation
tube 211. Tube 226 receives a slip stream 280 of the base fluid
250. The slip stream 280 of the base fluid 250 travels through tube
226 through Coriolis flow meter 222 through tube 227 and back
into tank/mixer 210. With the base fluid 250 flowing through Coriolis
flow meter 222 Coriolis flow meter 222 measures a density of the
base fluid 250. Coriolis flow meter 222 transmits a base fluid density
measurement to control system 224.
[0084] Tank/mixer 210 then receives and mixes the proppant 252
with the base fluid 250 to make the fracture fluid 202. Based on
the setting of valve 213 pump 228 circulates the fracture fluid
202 through discharge tube 218 and recirculation tube 211. Tube
226 receives a slip stream 280 of the fracture fluid 202. The slip
stream 280 of the fracture fluid 202 travels through tube 226 through
Coriolis flow meter 222 through tube 227 and back into tank/mixer
210. With the fracture fluid 202 flowing through Coriolis flow meter
222 Coriolis flow meter 222 measures a density of the fracture
fluid 202. Coriolis flow meter 222 transmits a fracture fluid density
measurement to control system 224.
[0085] Control system 224 receives the base fluid density measurement
and the fracture fluid density measurement. Control system 224 also
receives the density of the proppant 252. Control system 224 may
receive the density of the proppant 252 from an operator, from a
memory, or from another source. Control system 224 determines an
amount of the proppant 252 in the fracture fluid 202 based on the
base fluid density measurement, the fracture fluid density measurement,
and the density of the proppant 252. An operator of fracture fluid
system 201 can look at the amount of proppant 252 in the fracture
fluid 202 as determined by control system 224 to adjust the amount
of the proppant 252 added to the fracture fluid 202. Based on this
disclosure, those skilled in the art will appreciate how to modify
existing measurement systems to make measurement system 200.
[0086] When the fracture fluid 202 has the proper amount of proppant
252 valve 213 is switched so that the fracture fluid 202 is pumped
down hole through supply tube 212. There maybe other devices or
systems connected to supply tube 212 to pump the fracture fluid
202 down hole, such as a large pump.
Control System--FIG. 3
[0087] FIG. 3 illustrates an example of control system 224 in an
example of the invention. Control system 224 comprises a display
302 a user interface 304 and an auxiliary interface 306. An example
of control system 224 is the Daniel.TM. FloBoss.TM. 407. Display
302 is configured to display any relevant data to an operator. An
example of display 302 is a Liquid Crystal Display (LCD). User interface
304 is configured to allow the operator to enter information into
control system 224. An example of user interface 304 is a keypad.
Auxiliary interface 306 is configured to transmit information to,
and receive information from, an auxiliary system (not shown). An
example of auxiliary interface 306 is a serial data port.
[0088] Control system 224 may also comprise a processor and a storage
media. The operation of control system 224 may be controlled by
instructions that are stored on the storage media. The instructions
can be retrieved and executed by the processor. Some examples of
instructions are software, program code, and firmware. Some examples
of storage media are memory devices, tape, disks, integrated circuits,
and servers. The instructions are operational when executed by the
processor to direct the processor to operate in accord with the
invention. The term "processor" refers to a single processing
device or a group of inter-operational processing devices. Some
examples of processors are computers, integrated circuits, and logic
circuitry. Those skilled in the art are familiar with instructions,
processors, and storage media
Coriolis Flow Meter--FIG. 4
[0089] FIG. 4 illustrates an example of a Coriolis flow meter 400
in an example of the invention. Coriolis flow meter 400 could be
Coriolis flow meter 222 illustrated in FIG. 2. Coriolis flow meter
400 comprises a Coriolis sensor 402 and meter electronics 404. Meter
electronics 404 is connected to Coriolis sensor 402 via paths 406.
Meter electronics 404 is configured to provide density, mass flow
rate, volumetric flow rate, totalized mass flow, and other information
over path 408.
[0090] Coriolis sensor 402 comprises a flow tube 410 a balance
bar 412 process connections 414-415 a driver 422 pickoffs 424-425
and a temperature sensor 426. Flow tube 410 includes a left end
portion designated 410L and a right end portion designated 41 OR.
Flow tube 410 and its ends portions 410L and 410R extend the entire
length of Coriolis sensor 402 from an input end of flow tube 410
to an output end of flow tube 410. Balance bar 412 is connected
at its ends to flow tube 410 by brace bar 416.
[0091] Left end portion 410L is affixed to inlet process connection
414. Right end portion 410R is affixed to outlet process connection
415. Inlet process connection 414 and outlet process connection
415 are configured to connect Coriolis sensor 402 to a pipeline
(not shown).
[0092] In a conventional manner, driver 422 left pickoff 424
and right pickoff 425 are coupled to flow tube 410 and balance bar
412. Meter electronics 404 transmits a driver signal to driver 422
over path 432. Responsive to the driver signal, driver 422 vibrates
flow tube 410 and balance bar 412 in phase opposition at the resonant
frequency of the fluid-filled flow tube 410. The oscillation of
vibrating flow tube 410 induces Coriolis deflections in the flow
tube 410 in a well known manner. The pickoffs 424 and 425 detect
the Coriolis deflections and transmit pickoff signals that represent
the Coriolis deflections over paths 434 and 435 respectively.
[0093] Temperature sensor 426 is connected to flow tube 410. Temperature
sensor 426 detects the temperature of the fluid flowing through
flow tube 410. Temperature sensor 426 generates a temperature signal,
and transmits the temperature signal to meter electronics 404 over
path 436.
Example Operation of Measurement System--FIG. 5
[0094] FIG. 5 is a flow chart illustrating an example method 500
of operation of measurement system 200 in an example of the invention.
An operator turns on control system 224 and Coriolis flow meter
222. Control system 224 receives an instruction to clear the memory
on control system 224. The operator clears the memory by entering
a "Clear" instruction through user interface 304. In step
504 control system 224 prompts the operator to enter a density
of the proppant 252. Control system 224 prompts the operator by
displaying "Enter Density of Proppant" through display
302. The operator enters the density of the proppant 252 in pounds
per gallon, through user interface 304. Assume for this example
that the proppant 252 is sand having a density of 22.1 lbs/gal.
In step 506 control system 224 receives the density of the proppant
252 as entered by the operator. The density of the proppant may
also be retrieved from memory, or received from another system.
[0095] Tank/mixer 210 mixes the base fluid 250 without the proppant
252. Based on the setting of valve 213 pump 228 circulates the
base fluid 250 through discharge tube 218 and recirculation tube
211. Tube 226 receives a slip stream 280 of the base fluid 250.
The slip stream 280 of the base fluid 250 travels through tube 226
through Coriolis flow meter 222 through tube 227 and back into
tank/mixer 210. With the base fluid 250 flowing through Coriolis
flow meter 222 Coriolis flow meter 222 measures a density of the
base fluid 250 in step 508. Coriolis flow meter 222 transmits a
base fluid density measurement to control system 224. Control system
224 displays the base fluid density measurement to the operator
in step 510. Coriolis flow meter 222 may also measure a mass flow
rate of the base fluid 250 a temperature of the base fluid 250
and other parameters in step 508. Control system 224 may also display
the mass flow rate, the temperature, and the other parameters to
the operator in step 510. The operator could scroll through the
different parameters to view a desired parameter.
[0096] In step 512 control system 224 calculates an average density
of the base fluid 250. Control system 224 calculates the average
density by taking the average of ten density measurements of the
base fluid 250. Control system 224 may also calculate the average
density by taking the average of the density measurements over a
five second interval. While calculating the average density, control
system 224 may display "Stabilizing on Base Fluid" to
the operator. Control system 224 may calculate the average density
responsive to an instruction from the operator. For instance, the
operator watches the density measurement and the temperature measurement
displayed by control system 224 to see if the measurements stabilize.
If the measurements stabilize, then the operator instructs control
system 224 to calculate the average density.
[0097] In step 514 control system 224 determines whether the average
density just calculated is stable. For instance, if the average
density varied by more than 1% within a five second interval, then
the average density is not stable. In that case, control system
224 displays "Unstable Density" to the operator and returns
to step 512. If the average density did not vary by more than 1%,
then the average density is stable and can be used. Control system
224 displays the stable average density of the base fluid 250 to
the operator in step 516.
[0098] At this point, tank/mixer 210 mixes the proppant 252 into
the base fluid 250 to make the fracture fluid 202. Based on the
setting of valve 213 pump 228 circulates the fracture fluid 202
through discharge tube 218 and recirculation tube 211. Pump 228
re-circulates the fracture fluid to continuously blend the fracture
fluid 202 to the proper specifications. Tube 226 receives a slip
stream 280 of the fracture fluid 202. The slip stream 280 of the
fracture fluid 202 travels through tube 226 through Coriolis flow
meter 222 through tube 227 and back into tank/mixer 210. With
the fracture fluid 202 flowing through Coriolis flow meter 222
Coriolis flow meter 222 measures a density of the fracture fluid
202 in step 518. Coriolis flow meter 222 transmits a fracture fluid
density measurement to control system 224.
[0099] Control system 224 then calculates the pounds of sand added
to the fracture fluid 202. To calculate the pounds of sand added,
control system 224 uses the following equations. In step 520 control
system 224 calculates the percentage of solids (%S) in the fracture
fluid 202 using equation 1. % S=(.rho..sub.frac fluid-.rho..sub.base
fluid)/(.rho..sub.proppant-.rho..sub.base fluid) [1] where .rho..sub.frac
fluid is the density of the fracture fluid 202 .rho..sub.base fluid
is the density of the base fluid 250 and .rho..sub.proppant is
the density of the proppant 252.
[0100] In step 522 control system 224 calculates the proppant
displacement (P.D.) using equation 2. P.D.=231/.rho..sub.proppant
[2] where .rho..sub.proppant is the density of the proppant 252.
[0101] In step 524 control system 224 calculates the pounds of
sand added (P.S.A.) to the fracture fluid 202 using equation 3.
P.S.A.=(%S*231)/((1-%S)* P.D.) [3] The pounds of sand added (P.S.A.)
may also be referred to as pounds of proppant added (P.P.A.).
[0102] Control system 224 may calculate the pounds of sand added
using equation 4 instead of equations 1-3. P.S.A.=(.rho..sub.frac
fluid-.rho..sub.base fluid)/((1-(.rho..sub.frac fluid/.rho..sub.proppant))
[4] where .rho..sub.frac fluid is the density of the fracture fluid
202 .rho..sub.base fluid is the density of the base fluid 250
and .rho..sub.proppant is the density of the proppant 252.
[0103] In step 526 control system 224 displays the pounds of sand
added to the fracture fluid 202. Control system 224 displays the
pounds of sand added in units of pounds of sand added per one gallon
of water. Control system 224 also generates a signal representing
the pounds of sand added. The signal may be a 4-20 mA signal for
an auxiliary system (not shown). Coriolis flow meter 222 may also
measure a mass flow rate of the fracture fluid 202 a temperature
of the fracture fluid 202 and other parameters in step 518. Control
system 224 may display the mass flow rate, the temperature, and
the other parameters to the operator in step 526. The operator could
scroll through the different parameters to view a desired parameter.
Control system 224 returns to step 518.
[0104] Method 500 may further include steps 528 and 530. In step
528 control system 224 compares the velocity of the fracture fluid
202 to a threshold value. Control system 224 calculates the velocity
(velocity material) of the fracture fluid 202 using equation 5.
velocity.sub.material=flow rate.sub.material*A. F. [5] where A.F.
is an area factor and flow rate .sub.material is the flow rate of
the material. The area factor (A.F.) may be received from the operator
or retrieved from a memory or other system. If the velocity of the
fracture fluid 202 exceeds the threshold value, then control system
224 provides an indication that the velocity exceeds the threshold
value in step 530. For instance, if the velocity of the fracture
fluid 202 exceeds 12 ft/sec, then control system 224 triggers an
alarm. If the velocity of the fracture fluid 202 does not exceed
the threshold value, then control system 224 returns to step 518.
[0105] Control system 224 continues to calculate the pounds of
sand added to the fracture fluid 202. Tank/mixer 210 is a continuous
mixing system, not a batch system. Therefore, the operator has control
system 224 measure the pounds of sand added as long as tank/mixer
210 is providing the fracture fluid 202 to the well-bore. |