CN107942000B - Multifunctional modular carbon dioxide foam fracturing test method for mine - Google Patents
Multifunctional modular carbon dioxide foam fracturing test method for mine Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 239000006260 foam Substances 0.000 title claims abstract description 133
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 81
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 79
- 238000010998 test method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 177
- 239000012530 fluid Substances 0.000 claims abstract description 95
- 239000003245 coal Substances 0.000 claims abstract description 85
- 238000012360 testing method Methods 0.000 claims abstract description 85
- 238000004088 simulation Methods 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 239000004484 Briquette Substances 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000003860 storage Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 14
- 238000005065 mining Methods 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 9
- 239000012780 transparent material Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 3
- 230000035699 permeability Effects 0.000 abstract description 11
- 238000011835 investigation Methods 0.000 abstract description 10
- 230000006872 improvement Effects 0.000 abstract description 4
- 230000001965 increasing effect Effects 0.000 abstract description 2
- 239000012141 concentrate Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 7
- 238000000605 extraction Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
The invention relates to a multifunctional modular carbon dioxide foam fracturing test method for a mine, belongs to the technical field of coal seam fracturing simulation test methods, solves the technical problems of fracturing fluid property test and fracturing simulation, and sequentially comprises the following steps: a. starting a gas source station, and introducing driving gas into a booster pump; b. mixing high-pressure liquid carbon dioxide and high-pressure fracturing fluid, and pressing into a constant-temperature high-pressure foam fluid property testing module; c. pressing the high-pressure carbon dioxide foam fracturing fluid into a proppant mixing module after passing through a constant-temperature high-pressure foam fluid property testing module, and fully mixing the high-pressure carbon dioxide foam fracturing fluid with proppant filled in the proppant mixing module; d. and high-pressure carbon dioxide foam fracturing fluid with proppant is pressed into the coal seam fracturing simulation module through a pipeline. The invention has great significance for deeply researching the formula improvement and the performance investigation of the carbon dioxide foam liquid suitable for coal mines, the selection of the propping agent and the permeability increasing effect of the carbon dioxide foam fracturing liquid on coal beds.
Description
Technical Field
The invention belongs to the technical field of coal seam fracturing simulation test methods, and particularly relates to a multifunctional modular carbon dioxide foam fracturing test method, a modular test system and a test device for a mine.
Background
At present, gas accidents still remain as main accidents in the serious accidents of coal mines, so that gas control is the primary task of the safety work of the current coal mines, and gas extraction of the coal seam layer is carried out underground, which is particularly important for preventing the gas accidents and ensuring the safety production of the coal mines.
For a low-permeability coal seam, when the coal seam gas is pre-pumped by adopting a conventional drilling arrangement mode and parameters, the required drainage effect cannot be achieved. Therefore, a method for reinforcing gas extraction needs to be adopted, and the original fracture network in the coal seam is artificially forced to be communicated or a new fracture network is generated, so that the air permeability of the coal body is increased. At present, the method for strengthening gas extraction in China mainly comprises a protective layer mining technology, a water conservancy punching technology, a ground hydraulic fracturing technology, a hydraulic slotting technology, a deep hole presplitting blasting technology and the like.
CO2Foam fracturing is widely used in the petroleum industry as a new fracturing technology. CO 22The foam fracturing has the advantages of less consumption of the water-based fracturing fluid, little damage to stratums and cracks, high foam quality, continuous bubble phase, high viscosity and good sand carrying performance. CO 22The proppant is added into the foam fracturing, so that the proppant can enter into a fracture produced by fracturing along with the fracturing fluid, and the fracture is prevented from being closed again due to ground pressure and other reasons after fracturing and fracture forming are finished. The proppant can further improve the crack-making permeability-increasing effect of the fracturing fluid.
Now CO will be2The foam fracturing technology is introduced into the coal seam fracturing permeability increase, the formula and the proportion of the fracturing fluid need to be adjusted in a targeted manner, the carbon dioxide foam fracturing fluid and the propping agent suitable for the coal seam are developed, the coal seam simulation fracturing is carried out through a test, and the quality of the fracturing fluid is evaluated according to the fracturing permeability increase effect. Therefore, a whole set of carbon dioxide foam property evaluation device, a propping agent mixing device, a coal bed fracturing simulation device and a multifunctional modularized carbon dioxide foam fracturing test method thereof under a high-temperature and high-pressure environment are urgently needed to be developed to research a coal bed fracturing test.
Disclosure of Invention
The invention overcomes the defects of the prior art and solves the problem of CO2The technical problems of foam fracturing fluid property testing and coal seam fracturing simulation are solved, and the method is a multifunctional modular carbon dioxide foam fracturing test method for mining, which can be used for performing proppant-free fracturing fluid fracturing, permeability testing before and after fracturing (fracturing effect evaluation), fracturing with a proppant, high-temperature and high-pressure foam property testing and other functions rapidly, efficiently and intuitively.
The invention is realized by the following technical scheme.
A multifunctional modular carbon dioxide foam fracturing test method for mining is sequentially carried out according to the following steps:
a. the gas outlet of the gas source station is communicated with the gas inlet of the booster pump, the liquid outlet of the liquid carbon dioxide storage tank and the liquid outlet of the fracturing liquid storage tank are respectively communicated with the liquid inlets of the booster pumps, the liquid outlets of the two booster pumps are communicated with the liquid inlet of the constant-temperature high-pressure foam concentrate property testing module through a three-way connecting pipe, the liquid outlet of the constant-temperature high-pressure foam concentrate property testing module is communicated with the liquid inlet of the propping agent mixing module, and the liquid outlet of the propping agent mixing module is communicated with the liquid inlet of the coal seam; starting a gas source station, and introducing driving gas into a booster pump;
b. liquid carbon dioxide in a liquid carbon dioxide storage tank and fracturing fluid in a fracturing fluid storage tank are respectively pressurized by a booster pump, high-pressure liquid carbon dioxide and high-pressure fracturing fluid are mixed by a three-way connecting pipe to form carbon dioxide foam fracturing fluid, the high-pressure carbon dioxide foam fracturing fluid enters a constant-temperature high-pressure foam fluid property testing module, the water bath environment in the constant-temperature high-pressure foam fluid property testing module is adjusted, and the appearance states and half-life periods of the testing foam fluid in different water bath environments are observed;
c. pressing the high-pressure carbon dioxide foam fracturing fluid into a proppant mixing module after passing through a constant-temperature high-pressure foam fluid property testing module, and fully mixing the high-pressure carbon dioxide foam fracturing fluid with proppant filled in the proppant mixing module;
d. and (3) pressing the high-pressure carbon dioxide foam fracturing fluid with the proppant into the coal seam fracturing simulation module through a pipeline, and dynamically observing the coal seam fracturing simulation test process in real time.
Further, the water bath environment in the step b is a constant temperature water bath environment simulated according to the underground temperature environment.
Furthermore, a plurality of constant-temperature high-pressure foam liquid property testing modules, a coal seam fracturing simulation module and a proppant mixing module are combined randomly according to test requirements; the booster pump is a pneumatic piston type booster pump.
Furthermore, the constant-temperature high-pressure foam liquid property testing module comprises a constant-temperature water bath cavity, a foam liquid property testing cavity, a second fracturing liquid inlet pipe and a second fracturing liquid outlet pipe, wherein the foam liquid property testing cavity is a closed cavity, constant-temperature liquid is added into the constant-temperature water bath cavity, the foam liquid property testing cavity is arranged in the constant-temperature water bath cavity, the second fracturing liquid inlet pipe sequentially penetrates through the constant-temperature water bath cavity and the bottom surface of the foam liquid property testing cavity and is communicated with the interior of the foam liquid property testing cavity, the second fracturing liquid outlet pipe is arranged on the top surface of the foam liquid property testing cavity and is communicated with the interior of the foam liquid property testing cavity, and a pressure gauge and a liquid discharge valve are arranged on the second fracturing liquid outlet pipe; the side wall of the constant-temperature water bath cavity is made of transparent materials, a transparent foam liquid observation window is arranged on the side wall of the foam liquid property testing cavity, and scales are arranged on the foam liquid observation window.
Furthermore, the coal seam fracturing simulation module comprises a heating and control device, a briquette cavity, a liquid inlet pipe, a fracturing pipe, a liquid outlet pipe I, a liquid outlet pipe II and a pressure relief reverse drainage device, wherein an opening is formed in the upper part of the briquette cavity, a briquette cavity upper cover is covered at the opening, the bottom surface and the peripheral side surface of the briquette cavity are integrally formed, and the heating and control device is coated on the outer wall of the briquette cavity; the fracturing pipe is arranged on the briquette cavity and extends to the center of the briquette cavity, a reinforcing ring is arranged on the fracturing pipe, one end of the fracturing pipe penetrates through the side wall of one side of the briquette cavity and is communicated with the first liquid inlet pipe, a pressure relief reverse drainage device is arranged on the first liquid inlet pipe, a pressure relief switch is arranged on the pressure relief reverse drainage device, and a liquid outlet of the pressure relief reverse drainage device is communicated with the pressure relief pipe; the first liquid outlet pipe is arranged on the side wall of the molded coal cavity on the opposite side of the fracturing pipe, and the first liquid outlet pipe penetrates through the side wall of the molded coal cavity and is communicated with the inside of the molded coal cavity; the second liquid outlet pipe penetrates through the upper cover of the briquette cavity and is communicated with the inside of the briquette cavity; the molded coal cavity is filled with molded coal, and the liquid inlet pipe, the liquid outlet pipe I and the liquid outlet pipe II are respectively provided with a pressure gauge, a flow meter and a switch valve; the side wall of the briquette cavity is made of transparent material.
Further, the depth of the fracturing pipe extending into the cavity of the briquette coal is 500 mm.
Further, the briquette cavity upper cover is fixed at the opening of the briquette cavity through a fastening bolt, and a sealing rubber cushion is arranged between the briquette cavity upper cover and the opening of the briquette cavity.
The proppant mixing module comprises a proppant mixing cavity, a mixer, a proppant mixing cavity upper cover, a first fracturing fluid outlet pipe and a first fracturing fluid inlet pipe, wherein an opening is formed in the upper part of the proppant mixing cavity; the first fracturing fluid inlet pipe penetrates through the bottom surface of the proppant mixing cavity and extends into the proppant mixing cavity, the first fracturing fluid outlet pipe penetrates through the upper cover of the proppant mixing cavity and is communicated with the inside of the proppant mixing cavity, and the side wall of the first fracturing fluid outlet pipe and the upper cover of the proppant mixing cavity are integrally formed; the side wall of the proppant mixing cavity is made of a transparent material.
Further, the length of the first fracturing fluid inlet pipe extending into the proppant mixing cavity is 50 mm.
Compared with the prior art, the invention has the following beneficial effects.
The multifunctional modularized carbon dioxide foam fracturing test method for the mine, provided by the invention, has the advantages that the test platform is low in cost, practical in function and simple in structure, the constant-temperature high-pressure foam liquid property test module, the coal seam fracturing simulation module and the propping agent mixing module which are provided in the test platform are combined randomly according to test requirements, the foam liquid property investigation stage, the propping agent effect investigation stage and the foaming liquid fracturing effect investigation stage of permeability increase of a carbon dioxide foam fracturing coal seam are covered, and the method has great significance for deeply researching the formula improvement and the performance investigation of the carbon dioxide foam liquid suitable for a coal mine, the selection of a propping agent and the effect of the carbon dioxide foam fracturing liquid on the permeability increase of the coal seam.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of a partially enlarged cross-sectional structure of the constant-temperature high-pressure foam concentrate property testing module in fig. 1.
Fig. 3 is a partially enlarged sectional structural view of the coal layer fracture simulation module in fig. 1.
Fig. 4 is a partially enlarged sectional structural view of the proppant mixing module of fig. 1.
Fig. 5 is a schematic overall structure diagram of the second embodiment.
Fig. 6 is a schematic overall structure diagram of the third embodiment.
In the figure, 1 is a gas source station, 2 is a booster pump, 3 is a constant-temperature high-pressure foam liquid property testing module, 31 is a constant-temperature water bath cavity, 32 is a foam liquid property testing cavity, 33 is a foam liquid observation window, 34 is a scale, 35 is a fracturing liquid outlet pipe II, 36 is a fracturing liquid inlet pipe II, 41 is a liquid carbon dioxide storage tank, 42 is a fracturing liquid storage tank, 5 is a coal seam fracturing simulation module, 51 is a heating and control device, 52 is a briquette cavity, 53 is a liquid inlet pipe, 54 is a fracturing pipe, 55 is a reinforcing ring, 56 is a briquette cavity upper cover, 57 a liquid outlet pipe II, 58 is a liquid outlet pipe I, 59 is a pressure relief reverse drainage device, 6 is a proppant mixing module, 61 is a proppant mixing cavity, 62 is a mixer, 63 is a bracket, 64 is a proppant mixing cavity upper cover, 65 is a fracturing liquid outlet pipe I, and 66 is a fracturing liquid inlet pipe I.
Detailed Description
Example one
As shown in fig. 1 to 4, in order to cover a foam liquid property investigation stage, a proppant effect investigation stage, and a foam liquid fracturing effect investigation stage of permeability increase of a carbon dioxide foam fractured coal seam, and to further study the formula improvement and performance investigation of a carbon dioxide foam liquid suitable for a coal mine, the selection of a proppant, and the permeability increase of the carbon dioxide foam fracturing liquid on the coal seam, in the first embodiment, a constant-temperature high-pressure foam liquid property test module 3, a coal seam fracturing simulation module 5, and a proppant mixing module 6 are all added to a test system, and the specific connection structure is as follows:
gas outlet and booster pump 2's air inlet intercommunication of gas source station 1, booster pump 2 is pneumatic piston booster pump, liquid outlet and fracturing fluid storage tank 42's the liquid outlet of liquid carbon dioxide storage tank 41 respectively with booster pump 2's inlet intercommunication, the liquid outlet of two booster pumps 2 passes through tee junction pipe and constant temperature high pressure foam liquid nature test module 3's inlet intercommunication, constant temperature high pressure foam liquid nature test module 3's liquid outlet and proppant mixing module 6's inlet intercommunication, proppant mixing module 6's liquid outlet and coal seam fracturing simulation module 5's inlet intercommunication, each module is connected and is constituted test system, wherein:
the constant-temperature high-pressure foam concentrate property testing module 3 comprises a constant-temperature water bath cavity 31, a foam concentrate property testing cavity 32, a second fracturing liquid inlet pipe 36 and a second fracturing liquid outlet pipe 35, wherein the foam concentrate property testing cavity 32 is a closed cavity, constant temperature liquid is added into the constant-temperature water bath cavity 31, the foam concentrate property testing cavity 32 is arranged in the constant-temperature water bath cavity 31, the second fracturing liquid inlet pipe 36 sequentially penetrates through the constant-temperature water bath cavity 31 and the bottom surface of the foam concentrate property testing cavity 32 and is communicated with the interior of the foam concentrate property testing cavity 32, the second fracturing liquid outlet pipe 35 is arranged on the top surface of the foam concentrate property testing cavity 32 and is communicated with the interior of the foam concentrate property testing cavity 32, and a pressure gauge and a liquid discharge valve are arranged on the second fracturing liquid outlet pipe 35; the side wall of the constant-temperature water bath cavity 31 is made of a transparent material, the side wall of the foam concentrate property testing cavity 32 is provided with a transparent foam concentrate observation window 33, and the foam concentrate observation window 33 is provided with scales 34; carbon dioxide foam liquid with a certain volume is introduced into the constant-temperature high-pressure foam liquid property testing module 3 through the second fracturing liquid inlet pipe 36 by the booster pump 2, so that the condition in the stratum can be simulated under the high-pressure and different water bath temperature environments, the half-life period and other properties of the foam liquid can be tested, and the appearance state and the like of the foam liquid under the environment condition can be observed; in the prior art, the properties of the foam liquid are all investigated under the atmospheric pressure and normal temperature environment, the foam liquid can be actually in a high-pressure or even high-temperature state, and the properties of the foam liquid can be greatly changed due to different environments, so that the constant-temperature high-pressure foam liquid property testing module 3 provided in the first embodiment can better test the properties of the foam liquid under the high-temperature and high-pressure environment;
the coal seam fracturing simulation module 5 comprises a heating and control device 51, a coal briquette cavity 52, a liquid inlet pipe 53, a fracturing pipe 54, a first liquid outlet pipe 58, a second liquid outlet pipe 57 and a pressure relief reverse drainage device 59, wherein an opening is formed in the upper part of the coal briquette cavity 52, a coal briquette cavity upper cover 56 is covered on the opening, the bottom surface and the peripheral side surfaces of the coal briquette cavity 52 are integrally formed, the coal briquette cavity upper cover 56 is fixed at the opening of the coal briquette cavity 52 through fastening bolts, a sealing rubber pad is arranged between the coal briquette cavity upper cover 56 and the opening of the coal briquette cavity 52, and the heating and control device 51 is coated on the outer wall of the coal briquette cavity 52 to simulate the fracturing effect of carbon dioxide foam fracturing fluid in underground different temperature environments; the fracturing pipe 54 is arranged on the briquette cavity 52 and extends to the center of the briquette cavity 52, the depth of the fracturing pipe 54 extending into the briquette cavity 52 is 500mm, the fracturing pipe 54 is provided with the reinforcing ring 55, and the reinforcing rings 55 are provided with 9 groups, so that the hole sealing procedure of the traditional fracturing test can be omitted, the hole sealing effect can be realized, and the condition that fracturing fluid flows back along the fracturing pipe and loses pressure before fracturing a coal layer can be well prevented. One end of the fracturing pipe 54 penetrates through the side wall of one side of the briquette cavity 52 and is communicated with the liquid inlet pipe 53, the liquid inlet pipe 53 is provided with a pressure relief reverse drainage device 59, the pressure relief reverse drainage device 59 is provided with a pressure relief switch, a liquid outlet of the pressure relief reverse drainage device 59 is communicated with the pressure relief pipe, and the pore-blocking proppant flows through the fracturing pipe reversely along with the pressurized fracturing liquid and is discharged by the pressure relief reverse drainage device 59, so that the problem that a large amount of proppant is not diffused along with the fracturing fracture under the state that the proppant mixing module 6 is added and the phenomenon of pore blocking is accumulated at a fracturing orifice is solved; the first liquid outlet pipe 58 is arranged on the side wall of the briquette cavity 52 on the opposite side of the fracturing pipe 54, and the first liquid outlet pipe 58 penetrates through the side wall of the briquette cavity 52 and is communicated with the inside of the briquette cavity 52; the second liquid outlet pipe 57 penetrates through the briquette cavity upper cover 56 to be communicated with the inside of the briquette cavity 52; the molded coal cavity 52 is filled with molded coal, and a pressure gauge, a flow meter and a switch valve are arranged on the liquid inlet pipe 53, the first liquid outlet pipe 58 and the second liquid outlet pipe 57; the side wall of the briquette cavity 52 is made of transparent material; the experimental module adopts a one-inlet-two-outlet fracturing pipeline design, the pipelines are respectively fixed with the side surfaces of corresponding coal cavities into a whole, and are provided with pressure and flow meters, so that the air permeability change of the coal before and after fracturing can be inspected, and the contrast change of the air permeability in the same direction and the vertical direction of the fracturing holes can be inspected respectively;
the proppant mixing module 6 comprises a proppant mixing cavity 61, a mixer 62, a proppant mixing cavity upper cover 64, a fracturing fluid outlet pipe 65 and a fracturing fluid inlet pipe 66, wherein an opening is formed in the upper part of the proppant mixing cavity 61, the opening is covered with the proppant mixing cavity upper cover 64, a sealing rubber gasket is arranged between the proppant mixing cavity upper cover 64 and the opening of the proppant mixing cavity 61, a support 63 is arranged in the middle of the proppant mixing cavity 61, the mixer 62 is arranged below the support 63, the mixer 62 is a cone with a downward opening, and proppant is filled in the lower part of the proppant mixing cavity 61; the first fracturing fluid inlet pipe 66 penetrates through the bottom surface of the proppant mixing cavity 61 and extends into the proppant mixing cavity 61, the length of the first fracturing fluid inlet pipe 66 extending into the proppant mixing cavity 61 is 50mm, the first fracturing fluid outlet pipe 65 penetrates through the upper proppant mixing cavity cover 64 and is communicated with the inside of the proppant mixing cavity 61, and the side wall of the first fracturing fluid outlet pipe 65 and the upper proppant mixing cavity cover 64 are integrally formed; the sidewalls of the proppant mixing chamber 61 are made of a transparent material.
Furthermore, the side walls of the liquid inlet pipe 53 and the liquid outlet pipe II 57 are respectively fixedly connected with the side walls of the corresponding briquette cavities, and the side wall of the liquid outlet pipe I58 is fixedly connected with the briquette cavity upper cover 56.
A multifunctional modular carbon dioxide foam fracturing test method for mining is sequentially carried out according to the following steps:
a. communicating the test systems, starting the gas source station 1, and introducing driving gas into the booster pump 2;
b. liquid carbon dioxide in the liquid carbon dioxide storage tank 41 and fracturing fluid in the fracturing fluid storage tank 42 are respectively pressurized by the booster pump 2, high-pressure liquid carbon dioxide and high-pressure fracturing fluid are mixed by the three-way connecting pipe to form carbon dioxide foam fracturing fluid, the high-pressure carbon dioxide foam fracturing fluid enters the constant-temperature high-pressure foam fluid property testing module 3, the water bath environment in the constant-temperature high-pressure foam fluid property testing module 3 is adjusted, and the appearance state and half-life period of the testing foam fluid in different water bath environments are observed; according to the difference of the depths of the stratums, the fracturing temperatures of different stratums are simulated through water bath environments with different temperatures, and the formula improvement and the performance investigation of the carbon dioxide foam liquid suitable for different fracturing environments are deeply researched;
c. the high-pressure carbon dioxide foam fracturing fluid passes through the constant-temperature high-pressure foam fluid property testing module 3 and then is pressed into the proppant mixing module 6, and the high-pressure carbon dioxide foam fracturing fluid is fully mixed with the proppant added into the proppant mixing module 6; the fracturing fluid passing through the supercharging device has the characteristics of high pressure and high flow rate, and after entering the first fracturing fluid inlet pipe 66 at a high speed, the fracturing fluid is fully mixed with the proppant at the bottom of the proppant mixing cavity 61 under the blocking effect of the mixer 62, so that the function of adding the proppant into the high-pressure fracturing fluid is realized. The method that the fracturing fluid is pressurized firstly and then the propping agent is added through the constant-temperature high-pressure foam fluid property testing module 3 is adopted, so that the defect that the propping agent is directly mixed into the fracturing fluid before pressurization and cannot pass through the booster pump 2 is overcome;
d. and (3) pressing the high-pressure carbon dioxide foam fracturing fluid with the proppant into the coal seam fracturing simulation module 5 through a pipeline, and dynamically observing the coal seam fracturing simulation test process in real time. Wherein: the briquette is prepared by using raw materials such as cement, gypsum, coal grain water and the like according to the strength requirement, and then is added into the briquette cavity 52 through an opening arranged at the upper part of the briquette cavity 52 for solidification and molding. The moulded coal solidifies the shaping in, wraps up the fracturing pipe that the moulded coal cavity 52 inside set up together to be provided with 9 groups on the fracturing pipe and add the ring, saved the experimental hole sealing procedure of traditional fracturing, and can realize the hole sealing effect, prevent the condition that fracturing fluid just flows back along the fracturing pipe decompression before the fracturing coal body well.
Example two
As shown in fig. 5, in order to research the fracturing simulation function of the proppant-free carbon dioxide foam coal seam, in the second embodiment, two booster pumps 2 are adopted to pump liquid carbon dioxide and fracturing fluid into the coal seam fracturing simulation module 5 after being respectively pressurized, so as to visually observe the testing process of the fracturing of the proppant-free carbon dioxide foam coal seam, and the specific connection structure is as follows:
the device is provided with two gas source stations 1 and two booster pumps 2 respectively, wherein a gas outlet of one gas source station 1 is communicated with a gas inlet of one booster pump 2, a gas outlet of the other gas source station 1 is communicated with a gas inlet of the other booster pump 2, liquid outlets of a liquid carbon dioxide storage tank 41 and a fracturing fluid storage tank 42 are respectively communicated with liquid inlets of the two booster pumps 2, liquid outlets of the two booster pumps 2 are connected with a coal seam fracturing simulation module 5 through a tee joint to form a test system, and the structure of the coal seam fracturing simulation module 5 is the same as that recorded in the first embodiment.
A multifunctional modular carbon dioxide foam fracturing test method for mining is sequentially carried out according to the following steps:
a. communicating the test systems, starting the gas source station 1, and introducing driving gas into the booster pump 2;
b. and liquid carbon dioxide in the liquid carbon dioxide storage tank 41 and fracturing fluid in the fracturing fluid storage tank 42 are respectively pressurized by the booster pump 2 and then pressed into the coal seam fracturing simulation module 5, so that the coal seam fracturing simulation test process is dynamically observed in real time.
EXAMPLE III
As shown in fig. 6, in order to study the function of simulating the fracturing of the carbon dioxide foam coal seam with the proppant, in the third embodiment, two booster pumps 2 are adopted to respectively pressurize liquid carbon dioxide and fracturing fluid and then feed the pressurized liquid carbon dioxide and fracturing fluid into the coal seam fracturing simulation module 5 through the proppant mixing module 6, so as to visually observe the test process of the fracturing of the carbon dioxide foam coal seam with the proppant, and the specific connection structure is as follows:
the testing system is characterized in that two gas source stations 1 and two booster pumps 2 are respectively arranged, the gas outlet of one gas source station 1 is communicated with the gas inlet of one booster pump 2, the gas outlet of the other gas source station 1 is communicated with the gas inlet of the other booster pump 2, the liquid outlets of the liquid carbon dioxide storage tank 41 and the fracturing fluid storage tank 42 are respectively communicated with the liquid inlets of the two booster pumps 2, the liquid outlets of the two booster pumps 2 are communicated with a fracturing fluid inlet pipe 66 of the proppant mixing module 6 through a tee joint, the liquid carbon dioxide, the fracturing fluid and the proppant are fully mixed in the proppant mixing module 6 and then are connected with the coal seam fracturing simulation module 5 through a fracturing fluid outlet pipe 65 to form the testing system, and the structures of the coal seam fracturing simulation module 5 and the proppant mixing module 6 are the same as those recorded in.
A multifunctional modular carbon dioxide foam fracturing test method for mining is sequentially carried out according to the following steps:
a. communicating the test systems, starting the gas source station 1, and introducing driving gas into the booster pump 2;
b. liquid carbon dioxide in the liquid carbon dioxide storage tank 41 and fracturing fluid in the fracturing fluid storage tank 42 are respectively pressurized by the booster pump 2 and then pressed into the proppant mixing module 6, and high-pressure liquid carbon dioxide is fully mixed with the fracturing fluid and the proppant filled in the proppant mixing module 6;
c. and (3) pressing the high-pressure carbon dioxide foam fracturing fluid with the proppant into the coal seam fracturing simulation module 5 through a pipeline, and dynamically observing the coal seam fracturing simulation test process in real time.
As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (7)
1. A mining multifunctional modular carbon dioxide foam fracturing test method is characterized by comprising the following steps in sequence:
a. the gas outlet of the gas source station (1) is communicated with the gas inlet of the booster pump (2), the liquid outlet of the liquid carbon dioxide storage tank (41) and the liquid outlet of the fracturing fluid storage tank (42) are respectively communicated with the liquid inlets of the booster pumps (2), the liquid outlets of the two booster pumps (2) are communicated with the liquid inlet of the constant-temperature high-pressure foam liquid property testing module (3) through a three-way connecting pipe, the liquid outlet of the constant-temperature high-pressure foam liquid property testing module (3) is communicated with the liquid inlet of the propping agent mixing module (6), and the liquid outlet of the propping agent mixing module (6) is communicated with the liquid inlet of the coal seam fracturing simulation module (5; starting the gas source station (1) and introducing driving gas into the booster pump (2);
the coal seam fracturing simulation module (5) comprises a heating and control device (51), a briquette cavity (52), a liquid inlet pipe (53), a fracturing pipe (54), a first liquid outlet pipe (58), a second liquid outlet pipe (57) and a pressure relief reverse drainage device (59), wherein an opening is formed in the upper part of the briquette cavity (52), a briquette cavity upper cover (56) is covered on the opening, the bottom surface and the peripheral side surfaces of the briquette cavity (52) are integrally formed, and the heating and control device (51) is coated on the outer wall of the briquette cavity (52); the fracturing pipe (54) is arranged on the briquette cavity (52) and extends to the center of the briquette cavity (52), a reinforcing ring (55) is arranged on the fracturing pipe (54), one end of the fracturing pipe (54) penetrates through the side wall of one side of the briquette cavity (52) and is communicated with the liquid inlet pipe (53), a pressure relief inverted discharging device (59) is arranged on the liquid inlet pipe (53), a pressure relief switch is arranged on the pressure relief inverted discharging device (59), and a liquid outlet of the pressure relief inverted discharging device (59) is communicated with the pressure relief pipe; the first liquid outlet pipe (58) is arranged on the side wall of the molded coal cavity (52) on the opposite side of the fracturing pipe (54), and the first liquid outlet pipe (58) penetrates through the side wall of the molded coal cavity (52) and is communicated with the inside of the molded coal cavity (52); the second liquid outlet pipe (57) penetrates through the upper cover (56) of the briquette cavity and is communicated with the inside of the briquette cavity (52); the molded coal cavity (52) is filled with molded coal, and the liquid inlet pipe (53), the liquid outlet pipe I (58) and the liquid outlet pipe II (57) are all provided with a pressure gauge, a flow meter and a switch valve; the side wall of the briquette cavity (52) is made of transparent material;
b. liquid carbon dioxide in a liquid carbon dioxide storage tank (41) and fracturing fluid in a fracturing fluid storage tank (42) are respectively pressurized by a booster pump (2), high-pressure liquid carbon dioxide and high-pressure fracturing fluid are mixed by a three-way connecting pipe to form carbon dioxide foam fracturing fluid, the high-pressure carbon dioxide foam fracturing fluid enters a constant-temperature high-pressure foam fluid property testing module (3), the water bath environment in the constant-temperature high-pressure foam fluid property testing module (3) is adjusted, and the appearance states and half-life periods of the testing foam fluid in different water bath environments are observed;
c. the high-pressure carbon dioxide foam fracturing fluid passes through the constant-temperature high-pressure foam fluid property testing module (3) and then is pressed into the proppant mixing module (6), and the high-pressure carbon dioxide foam fracturing fluid is fully mixed with the proppant added in the proppant mixing module (6);
d. and (3) pressing the high-pressure carbon dioxide foam fracturing fluid with the proppant into the coal seam fracturing simulation module (5) through a pipeline, and dynamically observing the coal seam fracturing simulation test process in real time.
2. The mining multifunctional modular carbon dioxide foam fracturing test method according to claim 1, characterized in that: and the water bath environment in the step b is a constant-temperature water bath environment simulated according to the underground temperature environment.
3. The mining multifunctional modular carbon dioxide foam fracturing test method according to claim 1, characterized in that: the constant-temperature high-pressure foam liquid property testing module (3) comprises a constant-temperature water bath cavity (31), a foam liquid property testing cavity (32), a second fracturing liquid inlet pipe (36) and a second fracturing liquid outlet pipe (35), wherein the foam liquid property testing cavity (32) is a closed cavity, constant-temperature liquid is added into the constant-temperature water bath cavity (31), the foam liquid property testing cavity (32) is arranged in the constant-temperature water bath cavity (31), the second fracturing liquid inlet pipe (36) sequentially penetrates through the constant-temperature water bath cavity (31) and the bottom surface of the foam liquid property testing cavity (32) and is communicated with the interior of the foam liquid property testing cavity (32), the second fracturing liquid outlet pipe (35) is arranged on the top surface of the foam liquid property testing cavity (32) and is communicated with the interior of the foam liquid property testing cavity (32), and a pressure gauge and a liquid outlet valve are arranged on the second fracturing liquid outlet pipe (35); the side wall of the constant-temperature water bath cavity (31) is made of transparent materials, a transparent foam liquid observation window (33) is arranged on the side wall of the foam liquid property testing cavity (32), and scales (34) are arranged on the foam liquid observation window (33).
4. The mining multifunctional modular carbon dioxide foam fracturing test method according to claim 1, characterized in that: the depth of the fracturing pipe (54) extending into the briquette cavity (52) is 500 mm.
5. The mining multifunctional modular carbon dioxide foam fracturing test method according to claim 1, characterized in that: the briquette cavity upper cover (56) is fixed at an opening of the briquette cavity (52) through a fastening bolt, and a sealing rubber cushion is arranged between the briquette cavity upper cover (56) and the opening of the briquette cavity (52).
6. The mining multifunctional modular carbon dioxide foam fracturing test method according to claim 1, characterized in that: the proppant mixing module (6) comprises a proppant mixing cavity (61), a mixer (62), a proppant mixing cavity upper cover (64), a fracturing fluid outlet pipe I (65) and a fracturing fluid inlet pipe I (66), wherein an opening is formed in the upper part of the proppant mixing cavity (61), the proppant mixing cavity upper cover (64) is covered at the opening, a sealing rubber gasket is arranged between the proppant mixing cavity upper cover (64) and the opening of the proppant mixing cavity (61), a support (63) is arranged in the middle of the proppant mixing cavity (61), the mixer (62) is arranged below the support (63), the mixer (62) is a cone with a downward opening, and proppant is filled in the lower part of the proppant mixing cavity (61); the first fracturing fluid inlet pipe (66) penetrates through the bottom surface of the proppant mixing cavity (61) and extends into the proppant mixing cavity (61), the first fracturing fluid outlet pipe (65) penetrates through the upper cover (64) of the proppant mixing cavity and is communicated with the inside of the proppant mixing cavity (61), and the side wall of the first fracturing fluid outlet pipe (65) and the upper cover (64) of the proppant mixing cavity are integrally formed; the side walls of the proppant mixing chamber (61) are made of a transparent material.
7. The mining multifunctional modular carbon dioxide foam fracturing test method of claim 6, characterized in that: the length of the first fracturing fluid inlet pipe (66) extending into the proppant mixing cavity (61) is 50 mm.
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| CN109211912B (en) * | 2018-08-02 | 2021-08-10 | 西南石油大学 | Foam fracturing fluid sand carrying capacity evaluation device and working method |
| CN109488273B (en) * | 2018-11-26 | 2020-12-29 | 武汉工程大学 | Device for fracturing limestone top plate by using carbon dioxide and water mixed fluid |
| CN111504856B (en) * | 2020-04-27 | 2023-05-09 | 山东科技大学 | Rock mass fracture gas-liquid two-phase seepage experimental device and method |
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| CN113530516B (en) * | 2021-07-16 | 2022-09-02 | 中国矿业大学 | Pulsating CO 2 Foam fracturing and evaluation simulation integrated test device and method |
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