CN111734381A - Natural crack-containing fracturing and seam-making device for simulating injection-production relation of multiple injection-production well pattern - Google Patents
Natural crack-containing fracturing and seam-making device for simulating injection-production relation of multiple injection-production well pattern Download PDFInfo
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- 239000000853 adhesive Substances 0.000 claims abstract description 14
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- 238000002156 mixing Methods 0.000 claims abstract description 14
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to a natural crack-containing fracturing and seam-making device for simulating injection-production relation of a multi-injection-production well pattern, which comprises a core material input system, a plurality of pressure loading systems, a porous mold device and a multifunctional fracturing system, wherein the core material input system is composed of a plurality of material mixing devices, the plurality of material mixing devices are connected to the porous mold device, and a core manufactured by the porous mold device is arranged in the porous fracturing device of the multifunctional fracturing system and is connected with a crack monitoring system; the side surface of the porous mould is provided with a plurality of injection holes, so that the manufacturing of cores with different bedding is realized; the inner wall of each transparent organic glass plate is provided with grooves which are uniformly distributed in a transverse and longitudinal crossing manner and grooves with crossed diagonals, when the core is manufactured, the grooves are selected to install the adhesive partition plates, after the core material is solidified, the porous mold is opened, the adhesive partition plates are taken out, and the manufacturing of natural cracks is realized. The method is used for solving the problem that the natural reservoir stratum manufactured at the present stage has different well pattern distributions.
Description
The technical field is as follows:
the invention relates to a simulation experiment device for describing fracturing fracture-making fracture expansion behaviors under different well pattern conditions and different stratum recovery pressures in oilfield water injection exploitation, in particular to a fracturing fracture-making device containing natural fractures for simulating injection-production relations of multiple injection-production well patterns.
Secondly, background art:
at present, the hydraulic fracturing technology is a yield increasing measure widely applied in the field of petroleum engineering, and a better oil gas flow channel is formed in a reservoir through the hydraulic fracturing technology, so that the aim of greatly increasing the oil gas yield is fulfilled. Particularly, the effect of efficiently developing oil and gas is achieved by a horizontal well fracturing technology in the shale oil and gas reservoir and the compact sandstone oil and gas reservoir at present. In the actual oil field production process, the hydraulic fracturing reformation of a developed block is called as a main technical means for stable and high production of the oil field. However, the hydraulic fracture propagation azimuth and fracture extension trajectory and morphology are the key to ensure the technology implementation. Because the hydraulic fracturing is controlled by a surrounding stress field, the injection-production relationship and the injection-production well pattern matching relationship around the fracturing well are very important. Directly influences the fracturing construction of the reservoir and the output effect of the reservoir after fracturing. In the design of the existing fracturing test device, the injection and production well pattern test device is mostly not considered, the required experimental rock core is mostly a natural rock core or an artificial rock core, single-hole injection fracturing is carried out, and the fracturing and seam-making behaviors when the injection and production well patterns work together cannot be considered.
Thirdly, the invention content:
the invention aims to provide a natural fracture-containing fracturing and seam-creating device for simulating the injection-production relationship of a multi-injection-production well pattern, which is used for solving the problem that the manufactured natural reservoir has different well pattern distributions at the present stage, meeting the requirements of indoor tests on various cores, simultaneously solving the problem that the reservoir is reformed while injection-production is carried out in fracturing construction and solving the problem of water injection and fracturing recovery of the simulated reservoir core in an actual reservoir.
The technical scheme adopted by the invention for solving the technical problems is as follows: the fracturing and seam-making device containing natural fractures and simulating the injection-production relationship of the multi-injection-production well pattern comprises a core material input system, a plurality of pressure loading systems, a porous mold device and a multifunctional fracturing system, wherein the core material input system is composed of a plurality of material mixing devices, the plurality of material mixing devices are connected to the porous mold device, and a core manufactured by the porous mold device is arranged in the porous fracturing device of the multifunctional fracturing system and is connected with a fracture monitoring system;
the porous die device comprises a porous die and a plurality of force application devices, the porous die is arranged on a die slideway, the porous die is formed by splicing and combining a plurality of transparent organic glass plates, the bottom surface of the porous die is arranged on the die slideway, the rest transparent organic glass plates are respectively connected with one force application device, each force application device is connected with a pressure loading system, the force application devices comprise gas pipelines, connecting shafts, gas-driven telescopic rods and shock pads, the gas pipelines are connected with the gas-driven telescopic rods, the tail ends of the gas-driven telescopic rods are connected with the shock pads, the shock pads are connected with the transparent organic glass plates, the force application devices are firmly connected with the shock pads and the transparent organic glass plates through the gas-driven telescopic rods, and the force application devices apply force to; the transparent organic glass plate on the upper surface of the porous mold is provided with a plurality of threaded holes, the connectors are in threaded connection with the threaded holes, each connector is connected with a preset pipe, and the preset pipes are distributed in the porous mold to serve as fracturing pipes and injection-production pipes, so that cores distributed in different well patterns can be manufactured; the side surface of the porous die is provided with a plurality of injection holes which are threaded holes, so that the manufacturing of different bedding cores is realized; the inner wall of each transparent organic glass plate is provided with grooves which are uniformly distributed in a transverse and longitudinal crossing manner and grooves with crossed diagonals, when a core is manufactured, the grooves are selected to be provided with adhesive partition plates, after core materials are solidified, a porous mold is opened, the adhesive partition plates are taken out, and the manufacture of natural cracks is realized;
the multifunctional fracturing system comprises a porous fracturing device, a porous fluid injection device and a fracturing monitoring device, wherein the porous fracturing device comprises a fracturing support, the fracturing support is provided with a vertical plate, two support rods are horizontally fixed on one side of the vertical plate, a space between each support rod and a fracturing support seat is a rock core fracturing chamber, a shell of the pressure applying device is connected with the two support rods in a sliding manner, after a prepared rock core is placed in the rock core fracturing chamber, the shell of the pressure applying device slides to the vertical plate to seal the rock core in the pressure applying device, and the vertical plate is flushed on the upper surface of the rock core; the multi-hole fluid injection device comprises a first injection pump and a second injection pump, the first injection pump is connected with a fracturing pipeline through a first injection control device, the fracturing pipeline is connected with a fracturing pipe of a rock core and used for fracturing the rock core and providing injection power for fracturing fluid of the rock core, and the second injection pump is connected with injection and production pipes in the rock core through a second injection control device and a plurality of injection pipelines which are connected in parallel and used for simulating an actual injection and production well, realizing the injection and production while fracturing and simulating the fracturing of a real reservoir; the fracturing monitoring device is connected with the first liquid injection pump and the second liquid injection pump respectively.
In the scheme, the two transparent organic glass wood plates on the periphery of the porous mold are connected through the wedge-shaped fixing plates, each wedge-shaped fixing plate is connected with one thrust rod, and the thrust rods can automatically stretch and retract and can be automatically loaded to joints of the glass plates.
The pressure loading system in the scheme comprises a gas storage tank, a pressure control unit and a pressure monitoring system, wherein the gas storage tank is connected with each force application device through a gas transmission pipeline, the pressure control unit is arranged on the gas transmission pipeline, a gas flow and pressure control valve is arranged on the gas transmission pipeline at the outlet of the gas storage tank, and the gas flow and pressure control valve is connected with the pressure monitoring system.
The material mixing device in the scheme comprises a core raw material making pool, a raw material stirring unit, a flow control valve and a stirrer, wherein the stirrer is arranged in the core raw material making pool, the flow control valve is connected with the core raw material making pool through a raw material conveying pipeline, the raw material stirring unit is connected with the stirrer through a transmission system, and the core raw material making pool is connected with a porous mold through a material conveying pipeline.
The invention has the following beneficial effects:
1. the invention can randomly change the number and the distribution of the small holes of the top glass plate and simulate the distribution of different well patterns in an actual oil field, thereby solving the problem that the actual well pattern distribution can not be simulated in the test.
2. The invention can fracture the rock core, and can change the distribution of the injection and production well and the fracturing well by changing the access mode of the pipeline in the fracturing process, thereby realizing the simulation of the condition of injection and production while fracturing in the actual construction in the test. The invention can realize the synchronous implementation of the injection-production process and the fracturing operation and realize the fracturing test of injection-production and fracturing at the same time. Thereby solving the practical engineering problem of fracture propagation of practical reservoir fracturing.
3. The injection and production system can monitor and control injection and production conditions, the injection pipelines are configured through the monitoring system and the control valve, the start or stop of liquid injection of different injection and production pipes is realized, meanwhile, the injection of different quantities and different distribution well patterns can be realized respectively, and different requirements of tests are met.
4. The invention can change the pore space and pressure of the rock and the water-containing condition of the rock by changing the distribution of the injection pipe and the fracturing pipe, thereby simulating the characteristics of an actual reservoir and realizing the test related to the indoor saturation pressure.
5. The mold provided by the invention can be used for manufacturing cores with different volume shapes according to requirements, and cores with different crack characteristics can be manufactured at the same time, so that the problem of fixing the mold by the traditional mold is solved.
6. The method simulates the fracture-making fracture expansion behavior during the action of different injection-production well patterns. The fractured well pattern can be arranged according to the actual production of the oil field, the control of pressure and injection time is carried out through the control valve, and the problem of the fractured crack expansion function under the stratum conditions of different injection and production well pattern distribution characteristics, different stratum recovery pressures, different water injection pressures and the like is solved.
7. The invention provides a method for preparing cores with various characteristics, provides a method for preparing cores in any different forms, and solves the problem that the test needs cores with different characteristics.
Description of the drawings
FIG. 1 is a schematic diagram of the overall apparatus of the present invention.
Fig. 2 is a schematic view of the porous mold apparatus of the present invention.
FIG. 3 is a schematic view of the force applying apparatus of the present invention.
Figure 4 is a schematic of the multi-functional fracturing apparatus of the present invention.
In the figure: 1 material mixing device, 2 material stirring unit, 3 core material making pool, 4 flow control valve, 5 material conveying pipeline, 6 transmission system, 7 mixed material, 8 conveying control valve, 9 material conveying pipeline, 10 gas conveying pipeline, 11 gas flow, pressure control valve, 12 pressure monitoring system, 13 gas storage tank, 14 pressure control unit, 15 force application device, 16 shock pad, 17 transparent organic glass plate, 18 preset pipe, 19 injection hole, 20 die slideway, 21 gas control device, 22 porous fracturing device, 23 crack monitoring system, 24 force application device slideway, 25 wedge fixing plate, 26 threaded hole, 27 gas pipeline, 28 connecting shaft, 29 gas drive telescopic rod, 30 pressure application device, 31 gas conveying channel, 32 core fracturing chamber, 33 fracturing monitoring device, 34 first liquid injection pump, 35 first liquid injection control device, 36 second priming pump, 37 second priming control means, 38 priming valve, 39 adhesive separator.
Fifth, detailed description of the invention
The invention is further described below with reference to the accompanying drawings:
with reference to fig. 1, 2, 3 and 4, the fracturing and fracture-making device for natural fracture simulating the injection-production relationship of multiple injection-production well patterns can produce various cores with different well pattern distribution characteristics, and can perform fracturing and monitor and record the whole fracturing process, and the prepared core can perform different saturation pressure related tests, the core material mixing device comprises a core material input system, a plurality of pressure loading systems, a porous die device and a multifunctional fracturing system, wherein the core material input system is composed of a plurality of material mixing devices 1, the material mixing devices 1 are all connected to the porous die device, a core manufactured by the porous die device slides into a porous fracturing device 22 of the multifunctional fracturing system, and is connected with a crack monitoring system 23, and the gas storage tank 13, the pressure monitoring system 12 and the gas control device 21 are connected with a porous fracturing device 22.
Referring to fig. 2, the porous mold device includes a force applying device 15, a force applying device slide 24, a wedge-shaped fixing plate 25, a cushion 16, and a porous mold. In this embodiment, porous mould sets up on mould slide 20, and porous mould is formed according to cube rock core shape mosaic combination by six transparent organic glass boards 17, and the concatenation face can be adjusted the size as required, makes it satisfy experimental demand size, and five concatenation faces all are connected with force application device 15 through the connecting rod post, can control transparent organic glass board according to the demand and freely slide the removal on the slide to exert pressure to the rock core, make the rock core solidify the shaping. According to different well pattern distribution characteristics and the requirements for different water injection recovery fracturing in the test, the rock core of corresponding size and material is designed, then the transparent glass flat plate with different small holes distributed is manufactured according to the requirements, the transparent organic glass plate with other surfaces is manufactured simultaneously, and the transparent organic glass plate is arranged on the force application device 15.
The inner wall of each transparent organic glass plate is provided with grooves which are uniformly distributed in a transverse and longitudinal crossing manner and grooves with crossed diagonals, when the core is manufactured, the grooves are selected to be provided with the adhesive partition plates 39, after the core material is solidified, the porous mold is opened, the adhesive partition plates 39 are taken out, and natural cracks are formed naturally. In this embodiment, six faces are combined into a closed hexahedron as a module, and three rows and three columns of crossing uniformly distributed grooves and diagonal crossing grooves are respectively provided on the six faces to uniformly divide each face into small squares of 4 × 4 for mounting the adhesive spacers 39. When the core is manufactured, the core containing different forms of natural cracks can be manufactured in a core mould in a mode of clamping a hard adhesive plate. Therefore, according to the test requirements, the core with local brittleness characteristics of any different forms can be manufactured by changing the raw materials, and the shape of the natural fracture can be simulated by changing the position of the adhesive partition plate 39, so that the core with the natural fracture characteristics can be manufactured.
Referring to fig. 3, the force applying device includes a gas pipe 27, a connecting shaft 28, a gas driven telescopic rod 29 (acting like a jack), and a shock pad 16. The gas pipeline 27 is connected with the transparent organic glass plate 17 through a connecting shaft 28, four gas drive telescopic rods 29 and the shock absorption pad 16, the connecting shaft 28 is communicated with the gas pipeline 27, the gas pipeline 27 is connected with a pressure loading system, and the gas drive telescopic rods 29 are stretched through gas drive. During operation, data are monitored through the pressure monitoring system 12, the gas flow and the pressure control valve 11 are adjusted in real time, and the gas drive telescopic rod 29 is adjusted through the pressure control unit 14. The gas drive telescopic rod 29 is driven to stretch and contract to monitor and adjust the angle and the position of the transparent organic glass plate 17 (porous flat plate) on the upper surface of the porous mold, so that the angle and the position of the transparent organic glass plate are maintained at the angle and the position required by the test, wherein the gas drive telescopic rod 29 is connected with the porous flat plate through the shock absorption pad 16, a pressure buffering effect is achieved, and the rock core and the device are prevented from being damaged when the pressure is too large or is suddenly released. The force application devices 15 are connected with the shock absorption pad 16 and the transparent organic glass plate 17 through the rod columns (firmly connected and capable of sliding on the force application device slide ways 24), each force application device is connected with the pressure loading system, the monitoring system monitors the force application devices, the pressure control system controls the applied pressure, and the force application devices are adjusted and pressed in real time to meet the manufacturing requirements.
The wedge-shaped fixing plates 25 are made of hard rubber, the force application devices 15 push the transparent organic glass plates 17 to reach preset positions, and after each transparent organic glass plate is closed, the wedge-shaped fixing plates 25 are added at the closed edges of two adjacent transparent organic glass plates to play a role in fixing and sealing the die, so that core raw materials are prevented from leaking; the wedge-shaped fixing plates 25 are respectively connected with a thrust rod, and the thrust rods can automatically extend and retract and can be automatically loaded to the joint of the glass plates. Porous transparent organic glass board all has shock pad 16, and in the rock core manufacture process, shock pad 16 is connected with force applying device 15 through the connecting rod post, provides the required container of mould, exerts load to the mould, plays better sealed effect, prevents that rock core material from extruding transparent organic glass board in the rock core manufacture process, makes the seepage of rock core material.
According to actual well pattern distribution characteristics, the porous die device is arranged on the basis of simulating actual reservoir fracturing modification, so that cores capable of simulating different well pattern distribution characteristics are manufactured, hydraulic fracturing can be performed on the cores, and the multifunctional function of one device is realized. The top layer of the porous mold adopts a porous flat plate, threaded holes 26 are distributed on the surface of the porous flat plate, the connectors are in threaded connection with the threaded holes, each connector is connected with one preset pipe 18, the preset pipes are distributed in the porous mold to serve as fracturing pipes and injection-production pipes, and the number and the position distribution of the threaded holes can be designed according to test requirements so as to manufacture rock cores distributed in different well patterns; after the fracturing pipe or the injection and production pipe is connected with the connector, the connector can be screwed on the threaded hole 26. All adopt organic transparent glass plate around the porous mould, organic transparent glass plate surface all has the filling hole 19, and filling hole 19 also is the aperture of screw thread formula, and each core material input system passes through material conveying pipeline 9 and is connected with filling hole 19, provides the required raw and other materials of preparation rock core to the filling hole quantity and the position of four faces can design by oneself as required, so that can accomplish the design of different bedding rock cores. During the preparation rock core, according to different well pattern distribution characteristic demands and the requirement to different saturation pressure in the experiment, design out the rock core of corresponding size and material, then produce the transparent organic glass board that different screw holes distribute according to the requirement to produce the transparent organic glass board of other faces, install transparent organic glass board, can pour into the rock core material into. The hard adhesive plate is installed inside the core mold according to test requirements, different core materials can be injected through four transparent organic glass plates with injection holes around, cores with different properties are manufactured, and the characteristics of the natural core are better met.
In the process of making the rock core, the gas conveying device is automatically controlled through data displayed by the pressure monitoring system 12, the angle and the position of the porous flat plate are adjusted in real time, so that the porous flat plate is uniformly stressed all the time, the test requirements are met, and the porous flat plate and other flat plates form a closed module.
The invention can manufacture the rock cores with different shapes by adjusting system parameters. The unused threaded hole can be plugged by a nut, so that the core material is prevented from leaking outwards. Cores with different fracture characteristics can be manufactured through the porous die device, and the size and the shape of the core and the material of the core can be changed by changing the size and the shape of the die and injecting materials.
The material mixing device 1 comprises a core raw material making pool 3, a raw material stirring unit 2, a flow control valve 4 and a stirrer, wherein the stirrer is arranged in the core raw material making pool 3, the flow control valve 4 is connected with the core raw material making pool 3 through a raw material conveying pipeline 5, the raw material stirring unit 2 is connected with the stirrer through a transmission system 6, and the core raw material making pool 3 is connected with a porous mold through a material conveying pipeline 9.
Referring to fig. 4, the multi-functional fracturing system is comprised of a porous fluid injection device and a porous fracturing device 22, a fracture monitoring device 33. The multifunctional fracturing system is formed by coupling a porous fracturing device 22 and a multifunctional injection device, the porous fracturing device 22 performs fracturing according to pressure and data provided by a pressure applying device 30, different liquids are injected into a rock core through the multifunctional injection device, and a fracturing simulation test under actual well pattern distribution is simulated; during fracturing, injected liquid can be controlled by the fracturing monitoring device 33, so that relevant simulation tests under different saturation pressures can be simulated.
The porous fracturing device 22 comprises a fracturing support, the fracturing support is provided with a vertical plate, two support rods are horizontally fixed on one side of the vertical plate, a rock core fracturing chamber 32 is arranged in a space between the two support rods and a fracturing support base, a shell of the pressing device 30 is connected with the two support rods in a sliding mode, the manufactured rock core is placed in the rock core fracturing chamber, the shell of the pressing device slides to the vertical plate, the rock core is sealed in the pressing device 30, and the vertical plate is flushed on the upper surface of the rock core. The pressure applying device adopts a confining pressure applying device in the fracturing process in the prior art, the pressure applying device is provided with a crack monitoring system 23 and used for monitoring the core fracturing process, and the porous fracturing device 22 further comprises a gas conveying channel 31.
Porous fluid injection device comprises two filling pumps, first filling pump 34 connects the fracturing pipeline through first notes liquid controlling means 35, be used for the rock core fracturing, provide rock core fracturing liquid injection power, second filling pump 36 is through second notes liquid controlling means 37 and four other fracturing pipes of pipe connection, be used for the actual notes well of producing of simulation, the notes liquid condition of four pipelines is by installing the control flap control on four pipelines, real-time liquid control of annotating, wherein the filling pump is monitored and is controlled by fracturing monitoring system, carry out real-time supervision and control to notes fracturing of producing. After the core is made, the core is placed in the multi-hole fracturing apparatus 22. The fluid injection device is connected with the porous fracturing device 22 through different pipelines, the pipelines with corresponding functions are installed in corresponding threaded holes, an actual well pattern is simulated, the functions of injection and production and fracturing are achieved, meanwhile, different saturation pressures in an actual stratum can be simulated according to test requirements, and corresponding tests can be carried out. Simultaneously, fracturing monitoring devices 33 and crack monitoring system 23 among the multi-functional fracturing system can carry out real-time supervision, according to the different function control fracturing of tubular column the time liquid pour into flow and speed and the confined pressure when fracturing etc. monitoring and record fracturing relevant data and process, can monitor and control the notes circumstances of adopting, dispose the realization different notes that adopt the pipe to annotate liquid through monitoring system and control flap to the injection line, can realize simultaneously and inject into respectively different quantity and different distributions, satisfy experimental different demands.
The core material input system, the porous die device, the multifunctional fracturing system and other related systems are matched with one another to manufacture cores with different well pattern distribution characteristics, and various requirements are met.
The experimental method of the invention is as follows:
the first step is as follows: the method comprises the steps of preparing raw materials for manufacturing the rock core as required, respectively putting the rock core raw materials into different rock core raw material manufacturing pools 3, starting a raw material stirring unit 2, slowly opening a flow control valve 4, inputting the rock core raw materials into the rock core raw material manufacturing pools 3 while stirring, and uniformly stirring mixed materials 7. And (3) changing the corresponding flow control valve 4 according to the test requirement and the material required by the core, and controlling the flow of the core material through a pipeline and a flow control device (if only one material is required in the test, only one core input device needs to be controlled, and the other devices are closed).
The second step is that: data meeting the requirements are sequentially input into a pressure monitoring system 12 to serve as an initial condition, then a pressure loading system and a porous mold device are started, a radiation type adhesive partition plate is installed in a porous mold according to test requirements, the porous mold is observed, after the porous mold is closed, a wedge-shaped fixing plate 25 is installed, after sealing is determined, according to the characteristics of a core used in the test, a corresponding core material input pipe is connected with an injection hole 19 on a corresponding porous flat plate, a conveying control valve 8 is opened, raw material mixing is continuously stirred, the core material is smoothly conveyed into the closed porous mold, when the porous mold is filled with the core material, the conveying control valve 8 is closed, and then the whole core material input system is closed.
The third step: after the core material is solidified, opening the porous mold, conveying the core to the core fracturing chamber 32 along the slide way, and fixing the core; relevant parameters are input into the fracturing monitoring device 33 in advance, pipelines with different functions are connected to the pipe columns with the distributed rock cores according to test requirements, corresponding liquid injection valves 38 are opened according to requirements, the porous fracturing device is started, and observation is noticed.
The fourth step: after the experiment, derive and arrange data, take out the rock core that experimental completion gently, clean experimental apparatus equipment, close the power.
The invention provides a core manufacturing method and an experimental device, wherein the core simulating the characteristics of an actual reservoir can be manufactured by using the method, the core has the characteristics of actual well pattern distribution, the method and the device can simulate the actual process of injecting and extracting the core while fracturing, and the saturated fracturing of the fractured core can be changed by controlling the injection amount so as to be more in line with the fracturing state of the actual reservoir. The method mainly solves the problem that the manufactured natural reservoir has different well pattern distributions in the current stage, meets the requirements of indoor tests on various cores, and simultaneously solves the problems of performing reservoir transformation while injecting and extracting in agent fracturing construction and simulating reservoir core saturation pressure in an actual reservoir.
The invention can manufacture porous moulds with different shapes and different volumes according to requirements, can design different porous distribution flat plates according to requirements, can manufacture cores with different characteristics and cracks according to the porous moulds, and can manufacture cores with different functions according to different functions; the shape and size of the core are also changeable, and even the core with different mineral contents can be manufactured by changing the core material, so that different requirements of experiments can be met. By varying the material composition, size, thickness, and shape of the binder in the core, the properties of the fracture can be varied to achieve different functions. The device is a coupling of a fracturing device and a multifunctional injection device, can simulate the distribution of an actual well pattern by changing the distribution of small holes of a flat plate, realizes the function of injection-production-simultaneous fracturing, can change the injection condition of liquid by a fracturing detection control system, and can simulate different injection conditions in the actual well pattern and simulate related tests of different saturation pressures of an actual reservoir according to test requirements, wherein the similar conditions belong to the content of the scheme of the invention.
Claims (4)
1. The utility model provides a contain natural fracture fracturing and seam making device of multiple notes production well pattern notes production relation of simulation which characterized in that: the fracturing fracture-making experimental device for simulating the injection-production relationship of the multi-injection-production well pattern comprises a core material input system, a plurality of pressure loading systems, a porous mold device and a multifunctional fracturing system, wherein the core material input system is composed of a plurality of material mixing devices (1), the material mixing devices (1) are connected to the porous mold device, and a core made by the porous mold device is placed in the porous fracturing device (22) of the multifunctional fracturing system and is connected with a fracture monitoring system (23);
the porous mold device comprises a porous mold and a plurality of force application devices (15), the porous mold is arranged on a mold slideway (20), the porous mold is formed by splicing and combining a plurality of transparent organic glass plates (17), the bottom surface of the porous mold is arranged on the mold slideway (20), the rest transparent organic glass plates are respectively connected with one force application device (15), each force application device is connected with a pressure loading system, each force application device (15) comprises a gas pipeline (27), a connecting shaft (28), a gas drive telescopic rod (29) and a shock pad (16), the gas pipeline (27) is connected with the gas drive telescopic rod (29), the tail end of the gas drive telescopic rod (29) is connected with the shock pad (16), the shock pad (16) is connected with the transparent organic glass plates (17), the force application devices (15) are firmly connected with the shock pad (16) and the transparent organic glass plates (17) through the gas drive telescopic rods (29), and the force application devices (15) apply force to the corresponding transparent organic glass plates; the transparent organic glass plate on the upper surface of the porous mold is provided with a plurality of threaded holes (26), the connectors are in threaded connection with the threaded holes (26), each connector is connected with one preset pipe (18), and the preset pipes (18) are distributed in the porous mold to serve as fracturing pipes and injection-production pipes, so that cores distributed in different well patterns can be manufactured; the side surface of the porous mould is provided with a plurality of injection holes (19), the injection holes are threaded holes, and the manufacturing of different bedding cores is realized; the inner wall of each transparent organic glass plate is provided with grooves which are uniformly distributed in a transverse and longitudinal crossing manner and grooves with crossed diagonals, when a core is manufactured, the grooves are selected to be provided with adhesive partition plates (39), after core materials are solidified, a porous mold is opened, the adhesive partition plates (39) are taken out, and the manufacture of natural cracks is realized;
the multifunctional fracturing system comprises a porous fracturing device (22), a porous fluid injection device and a fracturing monitoring device (33), wherein the porous fracturing device (22) comprises a fracturing support, the fracturing support is provided with a vertical plate, two support rods are horizontally fixed on one side of the vertical plate, a rock core fracturing chamber (32) is arranged in a space between the two support rods and a fracturing support seat, a shell of the pressure applying device is connected with the two support rods in a sliding mode, a prepared rock core is placed in the rock core fracturing chamber, the shell of the pressure applying device slides to the vertical plate to seal the rock core in the pressure applying device (30), and the vertical plate is flushed on the upper surface of the rock core; the porous fluid injection device comprises a first injection pump (34) and a second injection pump (36), wherein the first injection pump (34) is connected with a fracturing pipeline through a first injection control device (35), the fracturing pipeline is connected with a fracturing pipe of a rock core and used for fracturing the rock core and providing injection power for fracturing fluid of the rock core, and the second injection pump (36) is connected with injection and production pipes in the rock core through a second injection control device (37) and a plurality of injection pipelines connected in parallel and used for simulating an actual injection and production well, realizing injection and production while fracturing and simulating the fracturing of a real reservoir; the fracturing monitoring device (33) is respectively connected with a first liquid injection pump (34) and a second liquid injection pump (36).
2. The natural fracture-containing fracturing and crack-creating device for simulating the injection-production relationship of a multi-injection-production well pattern according to claim 1, characterized in that: two transparent organic glass wooden boards around the porous mould are connected through a wedge-shaped fixing plate (25), each wedge-shaped fixing plate (25) is connected with a thrust rod, and the thrust rods can automatically stretch and retract and can be automatically loaded to the joint of the glass boards.
3. The natural fracture-containing fracturing and crack-creating device for simulating the injection-production relationship of a multi-injection-production well pattern according to claim 2, characterized in that: the pressure loading system comprises a gas storage tank (13), a pressure control unit (14) and a pressure monitoring system (12), wherein the gas storage tank (13) is connected with each force application device (15) through a gas transmission pipeline (10), the gas transmission pipeline (10) is provided with the pressure control unit (14), a gas flow and a pressure control valve (11) are arranged on the gas transmission pipeline at the outlet of the gas storage tank, and the gas flow and pressure control valve (11) is connected with the pressure monitoring system (12).
4. The natural fracture-containing fracturing and crack-creating device for simulating the injection-production relationship of a multi-injection-production well pattern according to claim 3, characterized in that: the material mixing device (1) comprises a core raw material making pool (3), a raw material stirring unit (2), a flow control valve (4) and a stirrer, wherein the stirrer is arranged in the core raw material making pool (3), the flow control valve (4) is connected with the core raw material making pool (3) through a raw material conveying pipeline (5), the raw material stirring unit (2) is connected with the stirrer through a transmission system, and the core raw material making pool (3) is connected with a porous mold through a material conveying pipeline (9).
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Application publication date: 20201002 |