CN110500068B - Large physical model experiment device and method for simulating well spacing and in-situ injection and production - Google Patents
Large physical model experiment device and method for simulating well spacing and in-situ injection and production Download PDFInfo
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- CN110500068B CN110500068B CN201910600481.2A CN201910600481A CN110500068B CN 110500068 B CN110500068 B CN 110500068B CN 201910600481 A CN201910600481 A CN 201910600481A CN 110500068 B CN110500068 B CN 110500068B
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- 238000002347 injection Methods 0.000 title claims abstract description 53
- 239000007924 injection Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002474 experimental method Methods 0.000 title claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 13
- 239000000523 sample Substances 0.000 claims description 39
- 239000011435 rock Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 24
- 238000005086 pumping Methods 0.000 claims description 24
- 230000001360 synchronised effect Effects 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 9
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- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
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- 238000003860 storage Methods 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
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Abstract
The invention relates to a large-scale physical model experimental device for simulating well arrangement and in-situ injection and production, which comprises an object model body unit, an axial pressure loading unit, a radial pressure loading unit, a high-pressure injection unit, a temperature loading unit, a monitoring unit and a data processing unit, wherein the object model body unit is used for loading axial pressure and radial pressure; also discloses a method for carrying out experiments by using the experimental device. The invention can quickly and effectively simulate the injection and production effects of different well pattern arrangements on oil and gas reservoirs in different areas and provide credible technical parameter support.
Description
Technical Field
The invention relates to the field of petroleum and natural gas engineering, in particular to a large-scale physical model experimental device and method for simulating well arrangement and in-situ injection and production.
Background
The three-dimensional physical simulation system can perform three-dimensional physical simulation under the oil reservoir condition, research physical phenomena related to production technologies, such as different types of oil reservoir development modes, seepage rules, production dynamics and the like, and provide experimental basis for numerical description and numerical simulation. Therefore, the three-dimensional physical simulation device is widely applied to the field of oil and gas field development and is an important research means for improving the exploitation efficiency.
At present, the most common method for the whole oil and gas reservoir in the physical simulation experiment is a regular well pattern method. The well arrangement mode based on the square well pattern and the well arrangement mode based on the triangular well pattern have good effects, but the injection and production conditions under the in-situ condition cannot be simulated in many cases. Patent CN 102889070B, CN 103114850B, CN 101793137B, CN 103556993B, although simulating the situation of different well patterns, does not reach the in-situ condition; patent CN 102644460 a mentions in situ mining, but does not achieve three-way stress loading.
Therefore, a large-scale physical model experiment device and method capable of simulating well arrangement and in-situ injection and production are urgently needed, and injection and production effects of different well pattern arrangements on oil and gas reservoirs in different areas can be quickly and effectively simulated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a large physical model experiment device and method for simulating well arrangement and in-situ injection and production, which can quickly and effectively simulate the injection and production effects of different well pattern arrangements on oil and gas reservoirs in different areas and provide credible technical parameter support.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a large-scale physical model experimental apparatus of simulation well arrangement and normal position notes production, includes thing mould body unit, axial pressure loading unit, radial pressure loading unit, high pressure injection unit, temperature loading unit, monitoring unit and data processing unit:
the material model body unit comprises a base, a kettle body, a front cover plate, a rear cover plate, a cover plate bracket and guide rails, wherein the kettle body is fixed in the middle of the base, a cylindrical cavity is arranged in the kettle body, two groups of guide rails are arranged on the base in the axial direction of the kettle body and in parallel with each other, the front cover plate is arranged on the guide rail on one side of the kettle body through the cover plate bracket in a sliding manner, the rear cover plate is arranged on the guide rail on the other side of the kettle body through the other cover plate bracket in a sliding manner, a plurality of bearing polished rods are arranged on the same circumference on the side wall of the kettle body, the bearing polished rods are arranged along the axial direction of the kettle body, nuts are arranged on the same circumference of the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are respectively and fixedly connected with the bearing polished rods through the nuts;
the axial pressure loading unit comprises a liquid filling barrel, a pumping device A, loading modules and a multi-channel coordinated synchronous loading control module, the liquid filling barrel is connected with the inlet end of the pumping device A, the outlet end of the pumping device A is connected with the loading modules, four loading modules are distributed on the inner wall of the kettle body along the circumferential direction, the front cover plate and the rear cover plate are respectively provided with one loading module and finally form six loading modules, the multi-channel coordinated synchronous loading control module is respectively in control connection with each loading module, and fluid in the liquid filling barrel is pumped into the loading modules through the pumping device A to provide three-axis pressure for rock samples;
the radial pressure loading unit comprises a liquid filling chamber and a pumping device B, and fluid in the liquid filling chamber is pumped into the kettle body through the pumping device B to provide radial pressure for the rock sample;
the high-pressure injection unit comprises a pipeline, a double-acting high-precision constant-current constant-pressure pump and a high-pressure monitoring system, the pipeline is embedded in the fluid injection pipe installation groove, the output end of the double-acting high-precision constant-current constant-pressure pump is connected with the input end of the pipeline, and the high-pressure monitoring system is in control connection with the double-acting high-precision constant-current constant-pressure pump;
the temperature loading unit comprises a temperature control system and a temperature sensor, the temperature control system comprises a heater and a power regulator, the heater is installed on the loading module, the power regulator is in control connection with the heater, the temperature sensor is embedded in the rock sample, and the temperature sensor is connected with the temperature control system;
the monitoring unit comprises an acoustic emission monitoring system and a laser scanning system;
the data processing unit comprises an electronic computer, matched intelligent acquisition and control software and data processing software and is used for meeting the requirements of implementation record and data processing and storage of experimental data.
Further, the apron bracket adopts the electrodynamic type to remove the bracket, installs limit switch on the guide rail, when the apron bracket removed extreme position, triggered limit switch, the apron bracket stopped to remove.
Furthermore, the pumping device A comprises a servo motor, a ball screw, a servo ultrahigh pressure cylinder, an ultrahigh pressure reversing valve, an ultrahigh pressure oil cylinder and an ultrahigh pressure needle valve, wherein the output end of the servo motor is connected with one end of the ball screw, the other end of the ball screw is connected with the driving end of the servo ultrahigh pressure cylinder, a liquid charging barrel is connected with the oil inlet end of the servo ultrahigh pressure cylinder, the oil outlet end of the servo ultrahigh pressure cylinder is connected with the control input end of the ultrahigh pressure reversing valve through a pipeline, the ultrahigh pressure needle valve is further installed on the pipeline between the servo ultrahigh pressure cylinder and the ultrahigh pressure reversing valve, the control output end of the ultrahigh pressure reversing valve is connected with the control end of the ultrahigh pressure oil cylinder, and the execution end of the ultrahigh pressure oil cylinder is connected with the loading module.
Further, pump into device B and include servo motor, ball, electromagnetic ball valve and plunger cylinder, servo motor's output is connected with ball's one end, and ball's the other end is connected with the drive end of plunger cylinder, and the liquid filling chamber passes through the tube coupling with the oil feed end of plunger cylinder, installs electromagnetic ball valve on the pipeline between the oil feed end of liquid filling chamber and plunger cylinder, the end of producing oil and the inside intercommunication of cauldron body of plunger cylinder.
Further, the high-pressure monitoring system comprises a constant delivery pump, an overflow valve, a one-way valve and an electro-hydraulic servo valve, wherein the output end of the constant delivery pump is connected with the inlet end of the one-way valve, the output end of the one-way valve is connected with the inside of the kettle body, and the overflow valve is further installed at the inlet of the one-way valve.
Further, the loading module comprises a cylinder body and at least one loading actuator, the loading actuator comprises a piston, a connecting plate and a loading plate, the cylinder body is connected with the piston, the output end of the piston is connected with one side of the connecting plate through a spherical hinge, the other side of the connecting plate is connected with the loading plate through a plurality of tension springs uniformly distributed around the connecting plate, a bearing retainer is embedded between the loading plate and the connecting plate, and the loading plate is in contact with the rock sample.
Furthermore, a heating groove is formed in the loading plate, and the heater is installed in the heating groove and can heat the rock sample.
Furthermore, the multi-channel coordination synchronous loading control module comprises a central computer, a switch, a master controller, slave controllers and a pressure sensor, wherein the computer is connected with the master controller through the switch, the slave controllers are connected with the master controller in parallel, the computer sends a control command to the master controller through the switch, and the slave controllers execute the loading command at the same speed to complete hierarchical synchronous coordination loading and channel information synchronous acquisition; the main controller and the slave controller are respectively composed of a radial pressure loading device, a control circuit and a circuit board, and the control circuit on the circuit board controls the radial pressure loading device to realize independent control of a single loading actuator.
Furthermore, the acoustic emission monitoring system consists of an acoustic emission probe, a geophone, an amplifier, a data acquisition card and a test software acquisition and data processing system, wherein the acoustic emission probe is embedded in acoustic emission probe mounting grooves of the front and rear loading plates, and a compression spring is arranged at the rear end of the acoustic emission probe.
A large-scale physical model experiment method for simulating well spacing and in-situ injection and production is carried out by using the large-scale physical model experiment device for simulating well spacing and in-situ injection and production, and comprises the following steps:
s1: determining a well pattern arrangement mode, and presetting injection and production point holes in a mould;
s2: manufacturing a rock sample in a mould according to different lithologies;
s3: connecting each monitoring system pipeline, a pressure control pipeline and a fluid injection pipeline in the experimental instrument;
s3: placing the prefabricated rock sample into a kettle body by using a forklift;
s4: moving the front cover plate and the rear cover plate to seal the kettle body;
s5: loading the temperature through a temperature loading unit to enable the temperature of the rock sample to reach an in-situ condition;
s6: the radial pressure and the axial pressure are synchronously loaded to the in-situ condition in a layered coordination manner through a multi-channel coordination synchronous loading control module;
s7: the injection point determines the injection flow rate and then injects fluid into the rock sample pump, and the recovery point collects the fluid;
s8: observing and recording the recovery ratio under the well pattern arrangement;
s9: and repeating the test after changing the arrangement mode of the well pattern, and comparing the recovery ratio under different well pattern arrangements.
The invention has the following advantages:
the injection and production effects of different well pattern arrangements on oil and gas reservoirs in different areas can be quickly and effectively simulated, and credible technical parameter support is provided.
Drawings
FIG. 1 is a schematic view of an apparatus of an object mold body according to the present invention;
FIG. 2 is a schematic diagram of a servo loading system for axial compression according to the present invention;
FIG. 3 is a schematic structural diagram of a loading module according to the present invention;
FIG. 4 is a schematic structural view of a loading actuator of the present invention;
FIG. 5 is a schematic diagram of the multi-channel hierarchical coordination synchronous loading control of the present invention;
FIG. 6 is a schematic diagram of multi-channel hierarchical coordinated synchronous loading according to the present invention;
FIG. 7 is a schematic diagram of a radial pressure servo loading system of the present invention;
FIG. 8 is a schematic diagram of the high pressure injection system of the present invention;
FIG. 9 is a schematic view of a fluid injection pipe mounting groove of the present invention;
FIG. 10 is a schematic view of a simulated well pattern layout and in-situ injection-production experiment process according to the present invention;
in the figure: 1-kettle body, 2-front cover plate, 3-rear cover plate, 4-cover plate bracket, 5-guide rail, 6-bearing polish rod, 7-nut, 8-loading module, 9-cylinder body, 10-piston, 11-connecting plate, 12-loading plate, 13-bearing retainer, 14-tension spring, 15-liquid charging barrel, 16-servo motor, 17-ball screw, 18-servo ultrahigh pressure cylinder, 19-ultrahigh pressure reversing valve, 20-ultrahigh pressure oil cylinder, 21-pressure sensor, 22-ultrahigh pressure needle valve, 23-electromagnetic ball valve, 24-plunger cylinder, 25-quantitative pump, 26-overflow valve, 27-one-way valve, 28-double-acting high-precision constant-current constant-pressure pump, 29-filter, 30-electrohydraulic servo valve, 31-a pressure gauge, 32-a heating groove, 33-an acoustic emission probe installation groove, 34-a radial pressure loading device, 35-a control circuit, 36-a circuit board, 37-a liquid filling chamber and 38-a fluid injection pipe installation groove.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
The utility model provides a large-scale physical model experimental apparatus of simulation well arrangement and normal position notes production, includes thing mould body unit, axial pressure loading unit, radial pressure loading unit, high pressure injection unit, temperature loading unit, monitoring unit and data processing unit:
as shown in fig. 1, the material mold body unit comprises a base, a kettle body 1, a front cover plate 2, a rear cover plate 3, a cover plate bracket 4 and guide rails 5, wherein the kettle body 1 is fixed in the middle of the base, a cylindrical cavity is arranged inside the kettle body 1, two sets of guide rails 5 are arranged on the base in parallel along the axial direction of the kettle body 1, the front cover plate 2 is slidably arranged on the guide rail 5 at one side of the kettle body 1 through one cover plate bracket 4, the rear cover plate 3 is slidably arranged on the guide rail 5 at the other side of the kettle body 1 through the other cover plate bracket 4, a plurality of bearing polished rods 6 are arranged on the same circumference on the side wall of the kettle body 1, the bearing polished rods 6 are arranged along the axial direction of the kettle body 1, nuts 7 are arranged on the same circumference of the front cover plate 2 and the rear cover plate 3, and the front cover plate 2 and the rear cover plate 3 are respectively fastened and connected with the bearing polished rods 6 through the nuts 7, the front cover plate 2 and the rear cover plate 3 can move along the guide rail 5, when the front cover plate and the rear cover plate move to the extreme positions, the limit switches are triggered, and the kettle is automatically stopped, preferably, an infrared safety protection system is respectively arranged between the front cover plate 2 and the kettle body 1 and between the rear cover plate 3 and the kettle body 1;
as shown in fig. 2, the axial pressure loading unit includes a liquid filling barrel 15, a pumping device a, loading modules 8 and a multi-channel coordinated synchronous loading control module, the liquid filling barrel 15 is connected with an inlet end of the pumping device a, an outlet end of the pumping device a is connected with the loading modules 8, four loading modules 8 are circumferentially arranged on the inner wall of the kettle body 1, each loading module 8 is composed of nine loading actuators distributed in a 3 × 3 matrix, one loading module 8 is respectively installed on the front cover plate 2 and the rear cover plate 3, one loading module 8 equipped with a single loading actuator is respectively installed on the front cover plate 2 and the rear cover plate 3, and finally a six-sided loading module 8 is formed, the multi-channel coordinated synchronous loading control module is respectively in control connection with each loading module 8, fluid in the liquid filling barrel 15 is pumped into the loading module 8 through the pumping device a, providing triaxial pressure to the rock sample;
as shown in fig. 7, the radial pressure loading unit comprises a liquid filling chamber 37 and a pumping device B, and the fluid in the liquid filling chamber 37 is pumped into the kettle body 1 through the pumping device B to provide radial pressure for the rock sample;
as shown in fig. 9, the high-pressure injection unit includes a pipeline, a double-acting high-precision constant-current constant-pressure pump 28, and a high-pressure monitoring system, the pipeline is embedded in the fluid injection pipe installation groove 38, the output end of the double-acting high-precision constant-current constant-pressure pump 28 is connected with the input end of the pipeline, the high-pressure monitoring system is connected with the double-acting high-precision constant-pressure pump 28 in a control manner, high-pressure fluid is pumped into a rock sample through the pipeline embedded in the fluid injection pipe installation groove 38, the double-acting high-precision constant-current constant-pressure pump 28 provides pumping pressure, the high-pressure monitoring system is responsible for process monitoring, the fluid injection pipe installation grooves are distributed on the loading plate in a 3 × 3 manner, and simulation of various well network arrangements such as a four-point method, a five-point method, a nine-point method, a reverse nine-point method and the like can be realized through combined installation of the pipeline;
the temperature loading unit comprises a temperature control system and a temperature sensor, the temperature control system comprises a heater and a power regulator, the heater is installed on the loading module 8, the power regulator is in control connection with the heater, the temperature sensor is embedded in the rock sample, and the temperature sensor is connected with the temperature control system;
the monitoring unit comprises an acoustic emission monitoring system and a laser scanning system;
the data processing unit comprises an electronic computer, matched intelligent acquisition and control software and data processing software and is used for meeting the requirements of implementation record and data processing and storage of experimental data.
Further, apron bracket 4 adopts the electrodynamic type to remove the bracket, installs limit switch on guide rail 5, and when apron bracket 4 removed extreme position, triggered limit switch, apron bracket 4 stopped to remove.
Further, as shown in fig. 2, the pumping device a includes a servo motor 16, a ball screw 17, a servo ultrahigh pressure cylinder 18, an ultrahigh pressure directional control valve 19, an ultrahigh pressure cylinder 20, and an ultrahigh pressure needle valve 22, an output end of the servo motor 16 is connected to one end of the ball screw 17, the other end of the ball screw 17 is connected to a driving end of the servo ultrahigh pressure cylinder 18, a liquid filling barrel 15 is connected to an oil inlet end of the servo ultrahigh pressure cylinder 18, an oil outlet end of the servo ultrahigh pressure cylinder 18 is connected to a control input end of the ultrahigh pressure directional control valve 19 through a pipeline, the ultrahigh pressure needle valve 22 is further installed on the pipeline between the servo ultrahigh pressure cylinder 18 and the ultrahigh pressure directional control valve 19, a control output end of the ultrahigh pressure directional control valve 19 is connected to a control end of the ultrahigh pressure cylinder 20, and an execution end of the ultrahigh pressure cylinder 20 is connected to the loading module 8.
Further, as shown in fig. 7, the pumping device B includes a servo motor 16, a ball screw 17, an electromagnetic ball valve 23 and a plunger cylinder 24, an output end of the servo motor 16 is connected with one end of the ball screw 17, the other end of the ball screw 17 is connected with a driving end of the plunger cylinder 24, a liquid filling chamber 37 is connected with an oil inlet end of the plunger cylinder 24 through a pipeline, the electromagnetic ball valve 23 is installed on a pipeline between the liquid filling chamber 37 and the oil inlet end of the plunger cylinder 24, and an oil outlet end of the plunger cylinder 24 is communicated with the inside of the kettle 1.
Further, as shown in fig. 7 and 8, the high-pressure monitoring system includes a fixed displacement pump 25, an overflow valve 26, a check valve 27 and an electro-hydraulic servo valve 30, an output end of the fixed displacement pump 25 is connected with an inlet end of the check valve 27, an output end of the check valve 27 is connected with the inside of the kettle body 1, a filter 29 is further installed on a pipeline between the check valve 27 and the kettle body 1, the overflow valve 26 is further installed at an inlet of the check valve 27, and a pressure gauge 31 is further installed at an outlet end of the fixed displacement pump 25.
Further, as shown in fig. 3 and 4, the loading module 8 includes a cylinder 9 and at least one loading actuator, wherein the loading module 8 inside the kettle 1 has nine loading actuators distributed in a 3 × 3 matrix, the loading modules on the front cover plate 2 and the rear cover 3 have one loading actuator, the loading actuator includes a piston 10, a connecting plate 11 and a loading plate 12, the cylinder 9 is connected with the piston 10, an output end of the piston 10 is connected with one surface of the connecting plate 11 through a spherical hinge, the other surface of the connecting plate 11 is connected with the loading plate 12 through a plurality of tension springs 14 uniformly distributed around the connecting plate 11, a bearing retainer 13 is embedded between the loading plate 12 and the connecting plate 11, and the loading plate 12 is in contact with the rock sample. The load plate 12 may be replaced with a rigid/flexible load plate as required by the test.
Further, as shown in fig. 4, the loading plate 12 is provided with a heating groove 32, and the heater is installed in the heating groove 32 and can heat the rock sample.
Further, as shown in fig. 5, the multi-channel coordinated and synchronous loading control module comprises a central computer, a switch, a master controller, slave controllers and a pressure sensor 21, wherein the computer is connected with the master controller through the switch, the slave controllers are connected in parallel with the master controller, the computer sends a control command to the master controller through the switch, and the slave controllers execute a loading command at the same speed to complete hierarchical synchronous coordinated loading and synchronous channel information acquisition; as shown in fig. 6, the master controller and the slave controller are each composed of a radial pressure loading device 34, a control circuit 35 and a circuit board 36, and the control circuit 35 on the circuit board 36 controls the radial pressure loading device 34 to realize independent control of the single loading actuator.
Further, as shown in fig. 4, the acoustic emission monitoring system is composed of an acoustic emission probe, a geophone, an amplifier, a data acquisition card, and a test software acquisition and data processing system, wherein the acoustic emission probe is embedded in the acoustic emission probe mounting groove 33 of the front and rear loading plates 12, and a compression spring is mounted at the rear end of the acoustic emission probe.
As shown in fig. 10, a large physical model experiment method for simulating well spacing and in-situ injection and production is performed by using the large physical model experiment device for simulating well spacing and in-situ injection and production, and includes the following steps:
s1: determining a well pattern arrangement mode, wherein the well pattern arrangement mode comprises but is not limited to a four-point method, a five-point method and a nine-point method, and presetting injection and production point holes in a mould;
s2: manufacturing a rock sample in a mould according to different lithologies;
s3: connecting each monitoring system pipeline, a pressure control pipeline and a fluid injection pipeline in the experimental instrument;
s3: placing the prefabricated rock sample into the kettle body 1 by using a forklift;
s4: the front cover plate 2 and the rear cover plate 3 are moved to seal the kettle body 1;
s5: loading the temperature through a temperature loading unit to enable the temperature of the rock sample to reach an in-situ condition;
s6: the radial pressure and the axial pressure are synchronously loaded to the in-situ condition in a layered coordination manner through a multi-channel coordination synchronous loading control module;
s7: the injection point determines the injection flow rate and then injects fluid into the rock sample pump, and the recovery point collects the fluid;
s8: observing and recording the recovery ratio under the well pattern arrangement;
s9: and repeating the test after changing the arrangement mode of the well pattern, and comparing the recovery ratio under different well pattern arrangements.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a large-scale physical model experimental apparatus of simulation well spacing and normal position notes production which characterized in that: including thing mould body unit, axial pressure loading unit, radial pressure loading unit, high pressure injection unit, temperature loading unit, monitoring unit and data processing unit:
the material model body unit comprises a base, a kettle body, a front cover plate, a rear cover plate, a cover plate bracket and guide rails, wherein the kettle body is fixed in the middle of the base, a cylindrical cavity is arranged in the kettle body, two groups of guide rails are arranged on the base in the axial direction of the kettle body and in parallel with each other, the front cover plate is arranged on the guide rail on one side of the kettle body through the cover plate bracket in a sliding manner, the rear cover plate is arranged on the guide rail on the other side of the kettle body through the other cover plate bracket in a sliding manner, a plurality of bearing polished rods are arranged on the same circumference on the side wall of the kettle body, the bearing polished rods are arranged along the axial direction of the kettle body, nuts are arranged on the same circumference of the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are respectively and fixedly connected with the bearing polished rods through the nuts;
the axial pressure loading unit comprises a liquid filling barrel, a pumping device A, loading modules and a multi-channel coordinated synchronous loading control module, the liquid filling barrel is connected with the inlet end of the pumping device A, the outlet end of the pumping device A is connected with six-sided loading modules, four loading modules are distributed on the inner wall of the kettle body along the circumferential direction, the front cover plate and the rear cover plate are respectively provided with one loading module and finally form the six-sided loading modules, the multi-channel coordinated synchronous loading control module is respectively in control connection with each loading module, fluid in the liquid filling barrel is pumped into the six-sided loading modules through the pumping device A to provide three-axis pressure for rock samples, and the rock samples are placed into the kettle body;
the radial pressure loading unit comprises a liquid filling chamber and a pumping device B, and fluid in the liquid filling chamber is pumped into the kettle body through the pumping device B to provide radial pressure for the rock sample;
the high-pressure injection unit comprises a pipeline, a double-acting high-precision constant-current constant-pressure pump and a high-pressure monitoring system, the pipeline is embedded and installed in a fluid injection pipe installation groove, the fluid injection pipe installation groove is arranged in the loading module, the output end of the double-acting high-precision constant-current constant-pressure pump is connected with the input end of the pipeline, and the high-pressure monitoring system is in control connection with the double-acting high-precision constant-current constant-pressure pump;
the temperature loading unit comprises a temperature control system and a temperature sensor, the temperature control system comprises a heater and a power regulator, the heater is installed on the loading module, the power regulator is in control connection with the heater, the temperature sensor is embedded in the rock sample, and the temperature sensor is connected with the temperature control system;
the monitoring unit comprises an acoustic emission monitoring system and a laser scanning system;
the data processing unit comprises an electronic computer, matched intelligent acquisition and control software and data processing software and is used for meeting the requirements of implementation record and data processing and storage of experimental data.
2. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 1, characterized in that: the cover plate bracket adopts an electric movable bracket, a limit switch is installed on the guide rail, when the cover plate bracket moves to a limit position, the limit switch is triggered, and the cover plate bracket stops moving.
3. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 2, wherein: the pumping device A comprises a servo motor, a ball screw, a servo ultrahigh pressure cylinder, an ultrahigh pressure reversing valve, an ultrahigh pressure oil cylinder and an ultrahigh pressure needle valve, wherein the output end of the servo motor is connected with one end of the ball screw, the other end of the ball screw is connected with the driving end of the servo ultrahigh pressure cylinder, a liquid charging barrel is connected with the oil inlet end of the servo ultrahigh pressure cylinder, the oil outlet end of the servo ultrahigh pressure cylinder is connected with the control input end of the ultrahigh pressure reversing valve through a pipeline, the ultrahigh pressure needle valve is further mounted on the pipeline between the servo ultrahigh pressure cylinder and the ultrahigh pressure reversing valve, the control output end of the ultrahigh pressure reversing valve is connected with the control end of the ultrahigh pressure oil cylinder, and the execution end of the ultrahigh pressure oil cylinder is connected with a loading module.
4. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 3, wherein: the pumping device B comprises a servo motor, a ball screw, an electromagnetic ball valve and a plunger cylinder, the output end of the servo motor is connected with one end of the ball screw, the other end of the ball screw is connected with the driving end of the plunger cylinder, a liquid filling chamber is connected with the oil inlet end of the plunger cylinder through a pipeline, the electromagnetic ball valve is installed on the pipeline between the liquid filling chamber and the oil inlet end of the plunger cylinder, and the oil outlet end of the plunger cylinder is communicated with the inside of the kettle body.
5. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 4, wherein: the high-pressure monitoring system comprises a constant delivery pump, an overflow valve, a one-way valve and an electro-hydraulic servo valve, wherein the output end of the constant delivery pump is connected with the inlet end of the one-way valve, the output end of the one-way valve is connected with the inner part of the kettle body, and the overflow valve is further installed at the inlet of the one-way valve.
6. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 5, wherein: the loading module comprises a cylinder body and at least one loading actuator, the loading actuator comprises a piston, a connecting plate and a loading plate, the cylinder body is connected with the piston, the output end of the piston is connected with one surface of the connecting plate through a spherical hinge, the other surface of the connecting plate is connected with the loading plate through a plurality of tension springs uniformly distributed on the periphery of the connecting plate, a bearing retainer is embedded between the loading plate and the connecting plate, and the loading plate is in contact with a rock sample.
7. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 6, wherein: the loading plate is provided with a heating groove, and the heater is arranged in the heating groove and can heat the rock sample.
8. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 7, wherein: the multichannel coordinated synchronous loading control module is composed of a computer, a switch, a main controller, slave controllers and pressure sensors, wherein the computer is connected with the main controller through the switch, a plurality of slave controllers are connected with the main controller in parallel, the main controller and the slave controllers are composed of radial pressure loading devices, control circuits and circuit boards, and the control circuits on the circuit boards carry out control on the radial pressure loading devices to realize independent control of a single loading actuator.
9. The large-scale physical model experimental facility for simulating well distribution and in-situ injection and production according to claim 8, wherein: the acoustic emission monitoring system consists of an acoustic emission probe, a geophone, an amplifier, a data acquisition card and a test software acquisition and data processing system, wherein the acoustic emission probe is embedded in an acoustic emission probe mounting groove of a loading plate, a compression spring is arranged at the rear end of the acoustic emission probe, and the loading plate is a loading plate in a loading module.
10. A large-scale physical model experiment method for simulating well distribution and in-situ injection and production is carried out by using the large-scale physical model experiment device for simulating well distribution and in-situ injection and production as claimed in any one of claims 1 to 9, and is characterized in that: the method comprises the following steps:
s1: determining a well pattern arrangement mode, and presetting an injection point hole and a recovery point hole in a mould;
s2: manufacturing a rock sample in a mould according to different lithologies;
s3: connecting each monitoring system pipeline, a pressure control pipeline and a fluid injection pipeline in the experimental instrument;
s4: placing the prefabricated rock sample into a kettle body by using a forklift;
s5: moving the front cover plate and the rear cover plate to seal the kettle body;
s6: loading the temperature through a temperature loading unit to enable the temperature of the rock sample to reach an in-situ condition;
s7: the radial pressure and the axial pressure are synchronously loaded to the in-situ condition in a layered coordination manner through a multi-channel coordination synchronous loading control module;
s8: the injection point determines the injection flow rate and then injects fluid into the rock sample pump, and the recovery point collects the fluid;
s9: observing and recording the recovery ratio under the well pattern arrangement;
s10: and repeating the test after changing the arrangement mode of the well pattern, and comparing the recovery ratio under different well pattern arrangements.
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