CN110618255A - Confining pressure test device for simulating stratum accumulation, installation method and test method - Google Patents
Confining pressure test device for simulating stratum accumulation, installation method and test method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000009825 accumulation Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000009434 installation Methods 0.000 title abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 230000007306 turnover Effects 0.000 claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims description 47
- 239000007924 injection Substances 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 42
- 238000003325 tomography Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005192 partition Methods 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 12
- 238000004088 simulation Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 4
- 238000003384 imaging method Methods 0.000 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a confining pressure test device, an installation method and a test method for simulating formation accumulation, which comprises a reaction kettle, wherein a built-in physical model module is installed inside the reaction kettle in a matching way, the top of the reaction kettle is sealed by a kettle cover of the reaction kettle, a gap is reserved between the outer circumferential surface of the built-in physical model module and the inner circumferential surface of the reaction kettle, a confining pressure cavity is formed in the gap, and a confining pressure cavity connecting pipeline is connected with a confining pressure control module; the device also comprises a turnover mechanism module for assembling before the test, wherein a built-in physical model module is installed in the turnover mechanism module in a matching way. The work is reliable.
Description
Technical Field
The invention relates to the technical field of test devices, in particular to a confining pressure test device, an installation method and a test method for simulating stratum accumulation.
Background
The underground resources of the earth are extremely rich, a large number of energy resources such as petroleum, natural gas, combustible ice and the like are stored, the cognitive degree of human beings is limited when the resources are exploited, the exploitation methods of various energy resources and the mastering of mechanism characteristics are still insufficient, and the problem that how to more deeply excavate the mechanism characteristics in the resources can be solved only by establishing a simulation device which more truly simulates the actual accumulation and exploitation environment in a laboratory.
At present, various test devices in related fields have been designed and developed at home and abroad, but different test devices have specific directivities. However, how to accurately simulate the energy input of a stratum pressure far field can not be accurately realized by a related test device until now for the real simulation of stratum accumulation and exploitation.
Disclosure of Invention
The applicant provides a confining pressure test device, an installation method and a test method for simulating formation and reservoir, aiming at the defects in the prior art, so that the test device for simulating the influence of the far-field confining pressure of the stratum on the reservoir can be simulated, the energy input of the far-field compact stratum to the whole reservoir space can be simulated by artificially controlling the external confining pressure, and the formation and exploitation characteristics of the actual stratum can be simulated more truly.
The technical scheme adopted by the invention is as follows:
a confined pressure test device for simulating formation accumulation of a stratum comprises a reaction kettle, wherein a built-in physical model module is installed inside the reaction kettle in a matching mode, the top of the reaction kettle is sealed through a kettle cover of the reaction kettle, a gap is reserved between the outer circumferential surface of the built-in physical model module and the inner circumferential surface of the reaction kettle, a confined pressure cavity is formed in the gap, and a connecting pipeline of the confined pressure cavity is connected with a confined pressure control module; the device also comprises a turnover mechanism module for assembling before the test, wherein a built-in physical model module is installed in the turnover mechanism module in a matching way.
As a further improvement of the above technical solution:
the structure of the reaction kettle is as follows: including the reation kettle cauldron body, the outer wall of the reation kettle cauldron body is installed the water bath and is pressed from both sides the cover, reation kettle cover is installed at the top of the reation kettle cauldron body, the outer periphery of reation kettle cover and reation kettle cauldron body top are installed hydraulic pressure simultaneously and are opened and shut the mechanism fast.
The structure of the built-in physical model module is as follows: the device comprises a base, wherein a confining pressure rubber cylinder is installed on the base in a matching way through a sealing device, a horizontal partition plate is installed at the lower part of the confining pressure rubber cylinder, and air holes are uniformly arranged on the partition plate at intervals; a lower covering cavity is formed between the lower part of the partition plate and the base, a heating coil is installed in the lower covering cavity, and the head of the heating coil penetrates through the base to be connected with the driving element; the middle part of the base is also provided with a gas injection liquid injection channel, the gas injection liquid injection channel is connected with the confining pressure control module, and the gas injection liquid injection channel injects gas into the confining pressure rubber cylinder; the reaction kettle cover is simultaneously covered on the top of the confining pressure rubber cylinder;
the horizontal well comprises a plurality of horizontal wells with L-shaped structures, the horizontal parts of the horizontal wells extend into the inner part from the outer part of the cylinder wall of the confining pressure rubber cylinder and are arranged in parallel at intervals, the vertical parts of the horizontal wells simultaneously penetrate through the kettle cover of the reaction kettle, and the external end head of the kettle cover of the reaction kettle is provided with a horizontal well integrator,
a plurality of spaced vertical wells are arranged in the horizontal part of each horizontal well in the longitudinal direction, the vertical wells at the same axial line position simultaneously penetrate through the kettle cover of the reaction kettle, and a sensor measuring column is arranged at the outer end head of the kettle cover of the reaction kettle;
the middle part of the reaction kettle cover is also provided with a full-size central well, and the full-size central well extends into the confining pressure rubber cylinder;
the reaction kettle cover and the confining pressure rubber cylinder are also provided with resistivity tomography modules;
the confining pressure control module further comprises a confining pressure tracking pump, a liquid container, a pressure sensor and a confining pressure control system.
The structure of the turnover mechanism module is as follows: the device comprises spaced brackets, wherein a speed reducing motor is fixedly arranged outside one of the brackets, a rotating shaft is arranged at the output end of the speed reducing motor, two ends of the rotating shaft are supported by a bearing device, the rotating shaft transversely penetrates through the two brackets, a surrounding plate is arranged on the rotating shaft, a chuck flange is arranged at the top of the surrounding plate, a bottom supporting flange is arranged at the bottom of the surrounding plate, and a built-in physical model module is arranged in the surrounding plate in a matched manner; the other bracket is fixed with the coaming through a limiting pin.
A method for installing a confining pressure test device for simulating stratum accumulation comprises the following steps:
the first step is as follows: the module of the turnover mechanism is in place;
the second step is that: hoisting the reaction kettle cover to the upper part of the turnover mechanism module through a crane, and fixing the reaction kettle cover on a chuck flange at the top of the enclosing plate through a bolt;
the third step: vertically and downwards mounting a sensor measuring column, a full-size central well and a vertical well on a reaction kettle cover, and firmly locking;
the fourth step: starting the turnover mechanism module to work, starting the speed reducing motor, turning over the part assembled in the second step by 180 degrees, and then installing a confining pressure rubber cylinder on the kettle cover of the reaction kettle;
the fifth step: the wall of the confining pressure rubber cylinder penetrates through the horizontal parts of a plurality of horizontal wells, the vertical part of each horizontal well penetrates through the kettle cover of the reaction kettle, a horizontal well integrator is arranged at the outer end of the kettle cover of the reaction kettle, and meanwhile, a resistivity tomography module is arranged on the kettle cover of the reaction kettle and the confining pressure rubber cylinder;
and a sixth step: filling sand bodies into the confining pressure rubber cylinder, installing a partition plate after filling, then installing a heating coil and a gas injection and liquid injection channel, and finally installing a base;
the seventh step: starting the turnover mechanism module again, starting the speed reducing motor, turning the whole built-in physical model module by 180 degrees to an upright state, and finishing the assembly of the built-in physical model module;
eighth step: hoisting the assembled built-in physical model module into the reaction kettle body, and then installing a hydraulic quick opening and closing mechanism;
the ninth step: and after the assembly is finished, testing.
A test method of a confining pressure test device for simulating stratum accumulation comprises the following steps:
the first step is as follows: the gas injection liquid injection channel is connected with the confining pressure control module, and stratum reservoir resources to be simulated are injected into the built-in physical model module uniformly and in a plunger shape through the lower covering cavity so as to ensure that the whole required reservoir resources can uniformly seep to each pore in the built-in physical model module;
the second step is that: starting a confining pressure tracking pump synchronously with the first step, continuously pumping confining pressure liquid into a confining pressure cavity from a liquid container according to the pressure change of the built-in physical model module, and ensuring that the pressure of the confining pressure cavity is higher than the formation pore pressure in the built-in physical model module in the whole process;
the third step: when the formation pore pressure in the built-in physical model module reaches the experimental design pressure value, stopping injecting the reservoir resources through the gas injection liquid injection channel and the underlying cavity, and simultaneously, automatically stopping the confining pressure tracking pump;
the fourth step: finishing the preservation;
if the resource is stored in a circulating mode, the inner circulation of the resource-storing kettle is realized by simultaneously opening an overflow channel at the top of the lower covering cavity and the kettle cover of the reaction kettle; meanwhile, a confining pressure tracking pump needs to be started, the pressure in the confining pressure cavity is continuously controlled, and the condition that the confining pressure tracking pump simulates the pressure of stratum far away from the field is guaranteed.
The invention has the following beneficial effects:
the invention has compact and reasonable structure and convenient operation, and the invention is based on the simulation of the combustible ice accumulation and exploitation test, solves the problem that the far-field confining pressure of the simulated formation has influence on the reservoir, can realize the simulation of the energy input of the far-field compact formation to the whole reservoir space by artificially controlling the external confining pressure, and further more truly simulates the accumulation and exploitation characteristics of the actual formation.
Drawings
FIG. 1 is a schematic structural diagram of a confining pressure test device for simulating formation reservoir formation according to the present invention.
FIG. 2 is an assembly diagram of a reactor and a built-in physical model module according to the present invention.
FIG. 3 is a schematic structural diagram of a built-in physical model module according to the present invention.
Fig. 4 is a schematic structural view of the built-in physical model module of the present invention in a state of being mounted to a turnover mechanism.
FIG. 5 is a schematic structural diagram of a module of the turnover mechanism of the present invention.
Fig. 6 is a schematic structural diagram of a confining pressure control module according to the present invention.
Wherein: 1. a reaction kettle; 2. a built-in physical model module; 3. a confining pressure control module; 4. a turnover mechanism module;
101. a reaction kettle body; 102. a water bath jacket; 103. a reaction kettle cover; 104. a hydraulic quick opening and closing mechanism;
201. confining and pressing the rubber cylinder; 202. horizontal wells; 203. a horizontal well integrator; 204. measuring a column by a sensor; 205. A full-scale centerwell; 206. a vertical well; 207. a resistivity tomography module; 208. an underlying cavity; 209. a heating coil; 210. a gas injection liquid injection channel; 211. a partition plate; 212. a base;
301. a confining pressure cavity; 302. a confining pressure tracking pump; 303. a liquid container; 304. a pressure sensor; 305. A confining pressure control system;
401. a reduction motor; 402. a chuck flange; 403. a rotating shaft; 404. a spacing pin; 405. a bottom support flange; 406. enclosing plates; 407. and (4) a bracket.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 6, the confined pressure test device for simulating formation accumulation of a stratum of the present embodiment includes a reaction kettle 1, a built-in physical model module 2 is installed inside the reaction kettle 1 in a matching manner, the top of the reaction kettle 1 is sealed by a reaction kettle cover 103, a gap is left between an outer circumferential surface of the built-in physical model module 2 and an inner circumferential surface of the reaction kettle 1, the gap forms a confined pressure cavity 301, and a connecting pipeline of the confined pressure cavity 301 is connected with a confined pressure control module 3; the device also comprises a turnover mechanism module 4 for assembling before the test, and a built-in physical model module 2 is installed in the turnover mechanism module 4 in a matching way.
The structure of reaction vessel 1 is: the quick opening and closing device comprises a reaction kettle body 101, a water bath jacket 102 is installed on the outer wall surface of the reaction kettle body 101, a reaction kettle cover 103 is installed on the top of the reaction kettle body 101, and a hydraulic quick opening and closing mechanism 104 is installed on the outer circumferential surface of the reaction kettle cover 103 and the top of the reaction kettle body 101.
The structure of the built-in physical model module 2 is as follows: the device comprises a base 212, wherein a confining pressure rubber cylinder 201 is installed on the base 212 in a matching way through a sealing device, a horizontal partition plate 211 is installed at the lower part of the confining pressure rubber cylinder 201, and air holes are uniformly arranged on the partition plate 211 at intervals; a lower covering cavity 208 is formed between the lower part of the partition 211 and the base 212, a heating coil 209 is installed in the lower covering cavity 208, and the head part of the heating coil 209 penetrates through the base 212 to be connected with a driving element; the middle part of the base 212 is also provided with a gas injection liquid injection channel 210, the gas injection liquid injection channel 210 is connected with the confining pressure control module 3, and the gas injection liquid injection channel 210 injects gas into the confining pressure rubber cylinder 201; the reaction kettle cover 103 is simultaneously covered on the top of the confining pressure rubber cylinder 201;
the horizontal well 202 is of an L-shaped structure, the horizontal parts of the horizontal wells 202 extend into the inner part from the outer part of the cylinder wall of the confining pressure rubber cylinder 201 and are arranged in parallel at intervals, the vertical parts of the horizontal wells 202 simultaneously penetrate through the reaction kettle cover 103, the outer end of the reaction kettle cover 103 is provided with a horizontal well integrator 203,
a plurality of spaced vertical wells 206 are arranged in the horizontal part of each horizontal well 202 in the longitudinal direction, the vertical wells 206 at the same axial position simultaneously penetrate through the reaction kettle cover 103, and a sensor measuring column 204 is arranged at the outer end of the reaction kettle cover 103;
the middle part of the reaction kettle cover 103 is also provided with a full-size central well 205, and the full-size central well 205 extends into the confining pressure rubber cylinder 201;
the reaction kettle cover 103 and the confining pressure rubber cylinder 201 are also provided with a resistivity tomography module 207;
the confining pressure control module 3 further comprises a confining pressure tracking pump 302, a liquid container 303, a pressure sensor 304 and a confining pressure control system 305.
The turnover mechanism module 4 has the structure that: the device comprises spaced brackets 407, wherein a speed reducing motor 401 is fixedly mounted outside one bracket 407, a rotating shaft 403 is mounted at the output end of the speed reducing motor 401, two ends of the rotating shaft 403 are supported by bearing devices, the rotating shaft 403 traverses the two brackets 407, a surrounding plate 406 is mounted on the rotating shaft 403, a chuck flange 402 is mounted at the top of the surrounding plate 406, a bottom supporting flange 405 is mounted at the bottom surface, and a built-in physical model module 2 is mounted inside the surrounding plate 406 in a matching manner; another bracket 407 is fixed to the shroud 406 by a retaining pin 404.
The installation method of the confining pressure test device for simulating stratum accumulation in the embodiment comprises the following steps:
the first step is as follows: the turnover mechanism module 4 is in place;
the second step is that: hoisting the reaction kettle cover 103 to the upper part of the turnover mechanism module 4 by a crane, and fixing the reaction kettle cover on a chuck flange 402 at the top of the enclosing plate 406 by bolts;
the third step: vertically and downwards mounting a sensor measuring column 204, a full-size central well 205 and a vertical well 206 on a reaction kettle cover 103, and firmly locking;
the fourth step: starting the turnover mechanism module 4 to work, starting the speed reducing motor 401, turning over the part assembled in the second step by 180 degrees, and then installing the confining pressure rubber cylinder 201 on the reaction kettle cover 103;
the fifth step: the wall of the confining pressure rubber cylinder 201 penetrates through the horizontal parts of a plurality of horizontal wells 202, the vertical parts of the horizontal wells 202 penetrate through the reaction kettle cover 103, the horizontal well integrator 203 is arranged at the outer end of the reaction kettle cover 103, and meanwhile, the resistivity tomography module 207 is arranged on the reaction kettle cover 103 and the confining pressure rubber cylinder 201;
and a sixth step: filling sand bodies into the confining pressure rubber cylinder 201, installing a partition 211 after filling, then installing a heating coil 209 and a gas and liquid injection channel 210, and finally installing a base 212;
the seventh step: the turnover mechanism module 4 is started again to work, the speed reducing motor 401 is started, the whole built-in physical model module 2 is turned over by 180 degrees to be in an upright state, and then the built-in physical model module 2 is assembled;
eighth step: hoisting the assembled built-in physical model module 2 into the reaction kettle body 101, and then installing a hydraulic quick opening and closing mechanism 104;
the ninth step: and after the assembly is finished, testing.
The specific structure and function of the invention are as follows:
the device mainly comprises a reaction kettle 1, a confining pressure control module 3, a built-in physical model module 2, a turnover mechanism module 4, a resistivity tomography module 207 and the like.
The reaction kettle 1 provides a sealed space for the whole test device,
built-in physical model module 2 is the core of whole testing arrangement for the flammable ice reservoir environment of simulation uses with reation kettle 1 cooperation simultaneously, can obtain a confined pressure cavity 301, utilizes confined pressure control module 3, can pressurize confined pressure cavity 301, is used for simulating the far field confined pressure condition of stratum.
The turnover mechanism module 4 is a necessary auxiliary tool for realizing the test function, and the resistivity tomography module 207 is a stratum imaging device and a method which can be realized only by relying on the built-in physical model module 2.
The reaction kettle 1 mainly comprises a reaction kettle body 101, a reaction kettle cover 103, a water bath jacket 102 and a hydraulic quick opening and closing mechanism 104.
The reaction kettle 1 is the foundation of the whole test device and is used for providing a sealed space, and simultaneously, the reaction kettle is matched with the built-in physical model module 2 together to provide a confined annular space for the test device. Wherein the reaction kettle 1 is provided with an injection port, an output port, a data acquisition channel and the like. The water bath jacket 102 serves as a thermostatic control for the entire test apparatus.
Confining pressure control module 3 comprises a confining pressure cavity 301, a confining pressure tracking pump 302, a liquid container 303, a pressure sensor 304 and a confining pressure control system 305.
The confining pressure control module 3 utilizes an annular confining pressure cavity 301 formed by the reaction kettle 1 and the built-in physical model module 2, high-pressure liquid is pumped into the confining pressure cavity 301 through a confining pressure tracking pump 302, and confining pressure load is applied to the built-in physical model module 2 by utilizing liquid pressure, so that the simulation of the remote confining pressure load of the reservoir stratum is realized. The method solves the problem of compaction uniformity of the porous medium physical model, can upgrade the accumulation saturation measurement method to a resistivity tomography method, and avoids the problem of more measuring columns in the porous medium physical model caused by adopting excessive plug-in electrode measuring columns.
The confining pressure control module 3 monitors the pressure change of the confining pressure cavity 301 in real time through the pressure sensor 304, and controls the confining pressure tracking pump 302 to start and stop in real time through the confining pressure control system 305, so that the confining pressure load is accurately controlled.
The built-in physical model module comprises a confining pressure rubber cylinder 201, a horizontal well 202, a horizontal well integrator 203, a sensor log 204, a full-size central well 205, a vertical well 206, a resistivity tomography module 207, a lower covering cavity 208, a heating coil 209 and a gas injection and liquid injection channel 210.
The built-in physical model is filled with porous media through the 2 pairs of filling devices, and therefore simulation of reservoir stratum is achieved. The sealing isolation of confining pressure liquid and porous media is realized by the sealing performance of the confining pressure rubber cylinder 201. Meanwhile, the resistivity tomography probe is mounted and used by utilizing the insulation property of the confining pressure rubber cylinder 201. Vertical and horizontal wells are distributed in the built-in physical model module 2 and are used for simulating combustible ice exploitation. The sensor pillars 204 built into the physical model can be equipped with different types of sensors for monitoring the parameter changes of the physical model in real time.
The bottom of the built-in physical model module 2 is provided with a lower cavity 208 for improving the uniformity of gas injection and providing an installation space for the heating coil 209. The bottom of the internal physical model is locally heated by the heat radiation effect of the heating coil 209, so that the combustible ice is prevented from being generated in advance at the bottom of the internal physical model, and the system is blocked and fails to be stored.
The turnover mechanism module 4 includes a speed reduction motor, a chuck flange 402, a rotating shaft 403, a stopper pin 404, and a bottom support flange 405.
The turnover mechanism module 4 is a necessary auxiliary tool for realizing device assembly and debugging and installation before test by matching with the built-in physical model. The assembly of the built-in physical model module 2 and the filling work of the porous medium in the built-in physical model module are realized on the turnover mechanism module 4. Through the overturning of the overturning mechanism, the problem that the equipment installation direction is contradictory to the porous medium filling direction can be solved.
The resistivity tomography module 207 performs layer-by-layer resistivity measurement imaging on the internal physical model module 2 by using a slice imaging principle, so as to monitor the accumulation saturation of the internal physical model.
In the actual use process, taking the storage and exploitation of combustible ice as an example:
the confining pressure test device for simulating stratum accumulation provided by the invention has the main functions of: and (3) placing the built-in physical model module 2 on the turnover mechanism module 4, and turning the built-in physical model module 2 for 180 degrees to finish the filling work of the porous medium (ice sand for short) containing ice. And hoisting the prepared built-in physical model module 2 into the reaction kettle 1 to complete installation in place. And starting the confining pressure control module 3, pumping confining pressure liquid in the liquid container 303 through the confining pressure tracking pump 302, and injecting liquid into the confining pressure cavity 301 to enable the confining pressure cavity 301 to reach the designed confining pressure, so that the influence of the far-field confining pressure of the stratum on the reservoir is simulated.
As shown in fig. 4 and 5, electrode measuring points are uniformly arranged on the confining pressure rubber cylinder 201 in a layered manner, and the resistivity tomography function is realized by measuring layer-by-layer section, and the selected measuring device is the resistivity tomography module 207. Meanwhile, methane gas is injected into the lower covering cavity 208 through the gas injection liquid injection channel 210, and the methane gas is uniformly and upwardly transported in the porous medium wrapped by the confining pressure rubber cylinder 201 through the lower covering cavity 208. At whole gas injection in-process, heating coil 209 of bottom heats the bottom of interior physical model module 2 through the mode of heat radiation, prevents at gas migration in-process, thereby it leads to physical model to block up or even cause to become to hide the failure to generate combustible ice at the bottom first.
As shown in fig. 6, the confining pressure control module 3 monitors the pressure change in the confining pressure cavity 301 through the pressure sensor 304, and uses the confining pressure control system 305 to implement real-time data feedback and instruction control, and controls the start and stop of the confining pressure tracking pump 302 to implement pressure stabilization of the confining pressure cavity 301.
The overturning mechanism module 4 mainly depends on a low-speed motor 401 to drive the overturning frame to rotate, so that the built-in physical model module 2 is overturned. Wherein chuck flange 402 and bottom support flange 405 provide support for the overall system.
The stratum reservoir resources are oil reservoirs, natural gas reservoirs or combustible ice reservoirs.
The first embodiment is as follows:
the test method of the confining pressure test device for simulating stratum accumulation in the embodiment comprises the following steps:
taking 20MPa oil reservoir or natural gas reservoir as an example:
the first step is as follows: the gas injection and liquid injection channel 210 is connected with the confining pressure control module 3, and the oil reservoir or the natural gas reservoir to be simulated is injected into the built-in physical model module 2 uniformly and in a plunger shape through the lower cavity 208, so that the whole required reservoir resource can be ensured to be seeped to each pore in the built-in physical model module 2 uniformly;
the second step is that: starting a confining pressure tracking pump 302 synchronously with the first step, continuously pumping confining pressure liquid into a confining pressure cavity 301 from a liquid container 303 according to the pressure change of the built-in physical model module 2, and ensuring that the pressure of the confining pressure cavity 301 is higher than the formation pore pressure in the built-in physical model module 2 in the whole process;
the third step: after a seepage process of hours or days, when the formation pore pressure in the built-in physical model module 2 reaches the reservoir pressure of 20 MPa. Stopping injecting the trapped resources through the gas injection liquid injection channel 210 and the underlying cavity 208, and simultaneously, automatically stopping the confining pressure tracking pump 302;
the fourth step: the preservation is finished.
Example two:
the test method of the confining pressure test device for simulating stratum accumulation in the embodiment comprises the following steps:
take 30MPa of combustible ice storage as an example:
the first step is as follows: the gas injection liquid injection channel 210 is connected with the confining pressure control module 3, and combustible ice reserves to be simulated are injected into the built-in physical model module 2 uniformly and in a plunger shape through the lower covering cavity 208 so as to ensure that the whole required reserved resources can uniformly seep to each pore in the built-in physical model module 2;
the second step is that: starting a confining pressure tracking pump 302 synchronously with the first step, continuously pumping confining pressure liquid into a confining pressure cavity 301 from a liquid container 303 according to the pressure change of the built-in physical model module 2, and ensuring that the pressure of the confining pressure cavity 301 is higher than the formation pore pressure in the built-in physical model module 2 in the whole process;
the third step: when the formation pore pressure in the built-in physical model module 2 reaches the combustible ice accumulation pressure of 30MPa, stopping injecting the accumulation resources through the gas injection and liquid injection channel 210 and the underlying cavity 208, and simultaneously automatically stopping the confining pressure tracking pump 302;
the fourth step: starting a circulating pump, and realizing the in-kettle circulation of the stored resources by simultaneously opening the lower covering cavity 208 and an overflow channel at the top of the reaction kettle cover 103; meanwhile, the confining pressure tracking pump 302 needs to be started, the pressure in the confining pressure cavity 301 is continuously controlled, the condition that the pressure simulates the pressure of stratum far away from the site is ensured, the icing and storing process is carried out for days or even dozens of days, and the circulation is stopped after the combustible ice meets the requirement of the saturation degree of storing.
The fifth step: and finishing the accumulation.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (6)
1. The utility model provides a confined pressure test device that simulation stratum becomes to hide which characterized in that: the device comprises a reaction kettle (1), wherein a built-in physical model module (2) is installed inside the reaction kettle (1) in a matched mode, the top of the reaction kettle (1) is sealed through a reaction kettle cover (103), a gap is reserved between the outer circumferential surface of the built-in physical model module (2) and the inner circumferential surface of the reaction kettle (1), a confining pressure cavity (301) is formed in the gap, and a connecting pipeline of the confining pressure cavity (301) is connected with a confining pressure control module (3); the device is characterized by further comprising a turnover mechanism module (4) for assembling before a test, wherein the built-in physical model module (2) is installed in the turnover mechanism module (4) in a matched mode.
2. A confined pressure test apparatus for simulating stratigraphic deposits according to claim 1, wherein: the reaction kettle (1) has the structure that: including the reation kettle cauldron body (101), the outer wall of the reation kettle cauldron body (101) is installed water bath and is pressed from both sides cover (102), reation kettle cover (103) are installed at the top of the reation kettle cauldron body (101), the outer periphery of reation kettle cover (103) and reation kettle cauldron body (101) top are installed hydraulic pressure and are opened and shut mechanism (104) fast simultaneously.
3. A confined pressure test apparatus for simulating stratigraphic deposits according to claim 1, wherein: the structure of the built-in physical model module (2) is as follows: the device comprises a base (212), wherein a confining pressure rubber cylinder (201) is installed on the base (212) in a matched mode through a sealing device, a horizontal partition plate (211) is installed on the lower portion of the confining pressure rubber cylinder (201), and air holes are formed in the partition plate (211) at uniform intervals; a lower covering cavity (208) is formed between the lower part of the partition plate (211) and the base (212), a heating coil (209) is installed in the lower covering cavity (208), and the head of the heating coil (209) penetrates through the base (212) to be connected with a driving element; the middle part of the base (212) is also provided with a gas injection liquid injection channel (210), the gas injection liquid injection channel (210) is connected with the confining pressure control module (3), and the gas injection liquid injection channel (210) injects gas into the confining pressure rubber cylinder (201); the reaction kettle cover (103) is simultaneously covered on the top of the confining pressure rubber cylinder (201);
the horizontal well comprises a plurality of horizontal wells (202) with L-shaped structures, the horizontal parts of the horizontal wells (202) extend into the inner part from the outer part of the wall of the confining pressure rubber cylinder (201) and are arranged in parallel at intervals, the vertical parts of the horizontal wells (202) simultaneously penetrate through the kettle cover (103) of the reaction kettle, and the external end head of the kettle cover (103) of the reaction kettle is provided with a horizontal well integrator (203),
a plurality of vertical wells (206) are arranged at intervals in the longitudinal direction of the horizontal part of each horizontal well (202), the vertical wells (206) at the same axial position simultaneously penetrate through the reaction kettle cover (103), and a sensor measuring column (204) is arranged at the outer end of the reaction kettle cover (103);
the middle part of the reaction kettle cover (103) is also provided with a full-size central well (205), and the full-size central well (205) extends into the confining pressure rubber cylinder (201);
the reaction kettle cover (103) and the confining pressure rubber cylinder (201) are also provided with a resistivity tomography module (207);
the confining pressure control module (3) further comprises a confining pressure tracking pump (302), a liquid container (303), a pressure sensor (304) and a confining pressure control system (305).
4. A confined pressure test apparatus for simulating stratigraphic deposits according to claim 1, wherein: the turnover mechanism module (4) has the structure that: the device comprises spaced brackets (407), wherein a speed reducing motor (401) is fixedly mounted outside one bracket (407), a rotating shaft (403) is mounted at the output end of the speed reducing motor (401), two ends of the rotating shaft (403) are supported through bearing devices, the rotating shaft (403) transversely penetrates through the two brackets (407), a surrounding plate (406) is mounted on the rotating shaft (403), a chuck flange (402) is mounted at the top of the surrounding plate (406), a bottom supporting flange (405) is mounted at the bottom surface of the surrounding plate (406), and a built-in physical model module (2) is mounted in the surrounding plate (406) in a matched manner; the other bracket (407) is fixed with the coaming (406) through a limiting pin (404).
5. A method of installing a confining pressure test apparatus for simulating stratigraphic deposits according to claim 1, comprising: the method comprises the following steps:
the first step is as follows: the turnover mechanism module (4) is in place;
the second step is that: hoisting the reaction kettle cover (103) to the upper part of the turnover mechanism module (4) through a crane, and fixing the reaction kettle cover on a chuck flange (402) at the top of the enclosing plate (406) through bolts;
the third step: a sensor measuring column (204), a full-size central well (205) and a vertical well (206) are vertically and downwards arranged on a reaction kettle cover (103) and are firmly locked;
the fourth step: starting a turnover mechanism module (4) to work, starting a speed reducing motor (401), turning the assembled part in the second step for 180 degrees, and then installing a confining pressure rubber cylinder (201) on a reaction kettle cover (103);
the fifth step: the wall of the confining pressure rubber cylinder (201) penetrates through the horizontal parts of a plurality of horizontal wells (202), the vertical part of each horizontal well (202) penetrates through the reaction kettle cover (103), a horizontal well integrator (203) is installed at the outer end of the reaction kettle cover (103), and meanwhile, a resistivity tomography module (207) is installed on the reaction kettle cover (103) and the confining pressure rubber cylinder (201);
and a sixth step: filling sand bodies into the confining pressure rubber cylinder (201), installing a partition plate (211) after filling, then installing a heating coil (209) and a gas and liquid injection channel (210), and finally installing a base (212);
the seventh step: the turnover mechanism module (4) is started again to work, the speed reducing motor (401) is started, the whole built-in physical model module (2) is turned over by 180 degrees to be in an upright state, and then the built-in physical model module (2) is assembled;
eighth step: hoisting the assembled built-in physical model module (2) to the inside of a reaction kettle body (101), and then installing a hydraulic quick opening and closing mechanism (104);
the ninth step: and after the assembly is finished, testing.
6. A test method using the confining pressure test apparatus for simulating formation of a reservoir according to claim 1, characterized in that: the method comprises the following steps:
the first step is as follows: the gas injection liquid injection channel (210) is connected with the confining pressure control module (3), and stratum reservoir resources to be simulated are injected into the built-in physical model module (2) uniformly and in a plunger shape through the lower covering cavity (208) so as to ensure that the whole required reservoir resources can seep to each pore in the built-in physical model module (2) uniformly;
the second step is that: synchronously starting a confining pressure tracking pump (302) with the first step, continuously pumping confining pressure liquid into a confining pressure cavity (301) from a liquid container (303) according to the pressure change of the built-in physical model module (2), and ensuring that the pressure of the confining pressure cavity (301) is higher than the formation pore pressure in the built-in physical model module (2) in the whole process;
the third step: when the formation pore pressure in the built-in physical model module (2) reaches a test design pressure value, stopping injecting the reservoir resources through the gas injection liquid injection channel (210) and the underlying cavity (208), and simultaneously automatically stopping the confining pressure tracking pump (302);
the fourth step: the preservation is finished.
The fifth step: in the accumulation process, if the situation of circulating accumulation resources exists, the in-kettle circulation of the accumulation resources is realized by simultaneously opening an overflow channel at the top of a lower covering cavity (208) and a reaction kettle cover (103); meanwhile, a confining pressure tracking pump (302) needs to be started to continuously control the pressure in the confining pressure cavity (301), so that the condition of simulating the pressure of stratum far away from the field is ensured.
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