CN109372510B - Method for fracturing limestone top plate by using carbon dioxide and water mixed fluid - Google Patents
Method for fracturing limestone top plate by using carbon dioxide and water mixed fluid Download PDFInfo
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- CN109372510B CN109372510B CN201811414272.0A CN201811414272A CN109372510B CN 109372510 B CN109372510 B CN 109372510B CN 201811414272 A CN201811414272 A CN 201811414272A CN 109372510 B CN109372510 B CN 109372510B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/14—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids
Abstract
The invention relates to a method for fracturing a limestone top plate by using a carbon dioxide and water mixed fluid, wherein a fracturing drill hole is arranged in the limestone top plate construction of a goaf by selecting a drilling position and drilling parameters, and a fracturing device is inserted into the drill hole; in CO2/H2O mixed fluidThe generating device is introduced with H2O and CO2Production of CO2/H2O mixed fluid; connecting a fracturing unit and CO2/H2And the O mixed fluid generation device is used for fracturing the limestone top plate. According to the method, high-pressure physical action, water softening and chemical corrosion are synergistically acted on the limestone top plate, a good fracturing effect can be obtained, and simultaneously, the waste gas of factory fossil fuel is used as CO2The gas source can reasonably utilize resources and protect the environment.
Description
Technical Field
The invention relates to the technical field of coal mining, and particularly discloses a method for fracturing a limestone top plate by using a mixed fluid of carbon dioxide and water.
Background
Most of coal seam roofs of Taiyuan groups in Shanxi province are limestone, the limestone mining goaf has the characteristics of large thickness and high strength, and limestone roofs suspended in the goaf are not easy to collapse. When the large-area suspended goaf limestone roof suddenly collapses, a storm accident of a working face can be caused, mechanical equipment in the working face is damaged, personnel casualties are caused, and the safe and efficient mining of a mine is influenced. In order to ensure safe and efficient mining of a mine, the thick and hard limestone roof suspended in the goaf needs to be subjected to roof-caving treatment in time.
The currently adopted hard roof treatment methods can be roughly classified into four types: a support method, a blasting method, a water injection softening method and a hydraulic fracturing method. The supporting method is a traditional passive method for supporting the hard top plate, cannot fundamentally treat the hard top plate, and can only prevent the hard top plate from falling suddenly from the angle of supporting the hard top plate; the blasting method can break and collapse the top plate, eliminate stress concentration and release elastic energy accumulated by the top plate, thereby reducing the possibility of rock burst and avoiding the harm of large-area suspension of the hard top plate, but the blasting method has complex construction procedures, high cost and pollution to underground air, and even can cause gas explosion and coal and gas outburst accidents, so the blasting method is unsafe; the water injection softening method is safer, can be operated in parallel underground, has little influence on production, but has no obvious water injection softening effect on limestone forming a hard top plate. The method for treating the hard roof by hydraulic fracturing is to inject high-pressure water into a target layer through a fracturing drill hole to destroy the integrity of hard roof rock, and the effect on the hard roof is mainly fracturing and softening. After pressure water is injected into the water injection holes, the water acts on the rock mass and is firstly softened, so that the strength of the rock mass is reduced, the premise of fracturing the rock mass is provided, and the final purpose of reducing the strength of the rock mass is also achieved; the fracturing can further open the gap of the rock body, so that the softening range of the rock body is enlarged, and the fracturing is the final purpose of cracking the rock body. The combined action of softening and fracturing reduces the strength of the rock mass.
The greenhouse effect caused by the over-high content of carbon dioxide in the air has obvious influence on the living environment of human beings, and the greenhouse effect is mainly caused by the excessive combustion of fossil energy sources such as coal, petroleum, natural gas and the like in the modern industrial society, and the fossil energy sources emit a large amount of carbon dioxide gas after combustion to enter the atmosphere to cause the temperature change of the atmospheric environment, capture and store CO2Is an important method for solving the greenhouse effect. The method for sealing carbon dioxide mainly comprises geological sealing and ocean sealing, wherein the brine layer, the non-recoverable coal layer and the waste oil-gas field are CO2The common type of geologic body for geological sequestration.
Considering the necessity of fracturing the thick and hard limestone roof and the composition of limestone component as CaCO3Mainly comprising CO2/H2The O mixed fluid is applied to the fractured limestone top plate. CO 22Calcium carbonate CaCO in the course of fracturing3In carbon dioxide CO2And water H2Reacting under O environment to generate calcium bicarbonate Ca (HCO)3)2Can make the limestone top plate form a hole, reduce the strength of the limestone top plate, improve the fracturing effect of the limestone top plate and the greenhouse gas CO used for fracturing2Taking waste gas, CO, generated by combustion of fossil fuel in factory2/H2The method has double meanings of preventing and treating mine disaster and protecting environment by fracturing limestone roof with O mixed fluid and utilizes waste gas generated by combustion of fossil fuel to generate CO2/H2The O mixed fluid fracturing fluid has a good guiding effect on a hard top plate in a fracturing treatment goaf.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for fracturing a limestone top plate by using a mixed fluid of carbon dioxide and water, which utilizes high-pressure CO2/H2The O mixed fluid is used for fracturing hydraulic cracked limestone, in the process, high-pressure physical action, water softening and chemical corrosion are synergistically acted on a limestone top plate, a good fracturing effect can be obtained, and simultaneously, waste gas of factory fossil fuel is used as CO2The gas source can reasonably utilize waste gas resources and protect the environment.
In order to solve the problems, the invention provides a method for fracturing a limestone top plate by using a mixed fluid of carbon dioxide and water, which comprises the following steps:
1) selecting a drilling position and drilling parameters, constructing on a limestone top plate of the goaf, setting a fracturing drill hole, and inserting a fracturing device into the drill hole;
2) in CO2/H2Introducing H into an O mixed fluid generating device2O and CO2Production of CO2/H2O mixed fluid;
3) connecting a fracturing unit and CO2/H2And the O mixed fluid generation device is used for fracturing the limestone top plate.
Thus, CO2/H2CO while fracturing limestone with O-mixed fluid2/H2O mixing fluid with limestone (CaCO)3) The following reactions also occur:
CaCO3+H2O+CO2→Ca(HCO3)2
CO2calcium carbonate CaCO in the course of fracturing3In carbon dioxide CO2And water H2Reacting under O environment to generate calcium bicarbonate Ca (HCO)3)2Can make the limestone top plate form a hole, reduce the strength of the limestone top plate, improve the fracturing effect of the limestone top plate and the greenhouse gas CO used for fracturing2Taking waste gas, CO, generated by combustion of fossil fuel in factory2/H2The lime rock roof fractured by the O mixed fluid has double meanings of preventing and treating mine disasters and protecting the environment.
Further, the pair in the step 2)CO2/H2Pressure of the O-mixed fluid generating device is adjusted, CO2/H2The pressure of the O mixed fluid generating device is controlled between 0.5MPa and 1.5MPa, and the mixed fluid is stirred at the same time.
Thus, the greater the pressure, the greater the CO2In CO2/H2The greater the solubility in the O mixed fluid, under which conditions CO2The limestone fracturing fluid has high solubility in water, and the mixed fluid has a good fracturing effect on a limestone top plate.
Further, CO in the step 2)2/H2The pressure of the O mixed fluid generating device is controlled between 0.8 and 1.2 MPa.
Under this condition, CO2The limestone fracturing fluid has high solubility, and the mixed fluid has a good fracturing effect on the limestone top plate.
Further, to CO2/H2Temperature of the O-mixed fluid generation device is adjusted, and the CO is mixed2/H2The temperature of the O-mixed fluid generating device is controlled between 8 and 15 ℃.
Thus, CO can be controlled by controlling the temperature2At H2Solubility in O with CO2/H2Reduction of temperature of O-mixed fluid, CO2Increased solubility in water, CO at 8-15 deg.C2The limestone fracturing fluid has high solubility in water, and the mixed fluid has a good fracturing effect on a limestone top plate.
Further, the CO is2/H2The temperature of the O-mixed fluid generating device is controlled between 10 and 13 ℃.
Under this condition, CO2The limestone fracturing fluid has high solubility in water, and the mixed fluid has a good fracturing effect on a limestone top plate.
Further, the step 3) comprises the step of adding CO to the fracturing device2/H2Pressure adjustment of O-mix fluid generation device, fracturing device, and CO2/H2The pressure of the O-mixed fluid generating device is controlled to be 50-150 MPa.
Thus, under the fracturing conditions, CO2Solubility in water is further oneThe step is increased, and meanwhile, the fracturing fluid has a good fracturing effect on the limestone top plate under the high-pressure condition.
Further, the step 3) of fracturing the plant and CO2/H2The pressure of the O-mixed fluid generating device is controlled to be 80-120 MPa.
Therefore, under the fracturing condition, the fracturing fluid has a good fracturing effect on the limestone top plate under the high-pressure condition.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus used in the present invention.
In the drawings, the reference numerals denote the following components:
CO2an air supply system 1; CO 22A storage tank 11; a first valve 12; a first check valve 13; a gas booster pump 14;
a supercharging system 2; a hydraulic oil tank 21; an oil inlet 22; a fourth valve 221; a first oil outlet 23; a fifth valve 231; a second oil outlet 24; a third oil outlet 25; a hydraulic oil booster pump 26; a third check valve 27; a safety valve 28; the hydraulic oil unloading valve 29;
CO2/H2an O-mix fluid generation device 3; a reaction vessel 31; a piston 32; a gas supply line 33; a liquid supply line 34; a liquid discharge line 35; a temperature sensor 36; a pressure sensor 37; a sixth valve 38;
H2an O supply system 4; a water storage tank 41; a second valve 42; a third valve 43; a filter 44; a second check valve 45; a liquid booster pump 46; a cooling water outlet 47; a cooling water inlet 48;
a fracturing device 5; a fracturing gun 51; a packer 52;
a temperature control system 6; a cooling water line 61; a cooling water circulation pump 62;
a stirring system 7; a motor 71; a stirring rod 72.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The invention is further described below with reference to fig. 1.
Fig. 1 is a schematic structural diagram of an apparatus used in the present invention, the apparatus including:
CO2/H2o mixed fluid generator 3 for preparing CO2/H2A reaction device for O mixed fluid;
a fracturing unit 5, the fracturing unit 5 being connected to the CO2/H2The O-mixed fluid generation device 3 is used by inserting the fracturing device 5 into a limestone top plate borehole and connecting the fracturing device 5 with CO2/H2An O-mix fluid generation device 3;
a temperature control system 6 for regulating CO2/H2CO in O-mixed fluid generator 32/H2The temperature of the O-mixed fluid can be controlled to control CO2At H2Solubility in O with CO2/H2Reduction of temperature of O-mixed fluid, CO2Increased solubility in water;
a stirring system 7 arranged in the CO2/H2Accelerating CO in O-mixed fluid generator 32Dissolution rate in water and accelerated CO2And H2O is mixed to form a mixed fluid;
H2 o supply system 4 for supplying CO2/H2The mixed fluid O generator 3 supplies the prepared CO2/H2A source of O mixed fluid;
CO2gas supply system 1 for supplying CO2/H2The O mixed fluid generating device 3 provides CO with certain pressure2Gas, higher pressure, CO2In CO2/H2The greater the solubility in the O mixed fluid;
a pressurization system 2 for regulating CO2/H2The pressure inside the O-mix fluid generator 3 can be increased to increase CO by pressurization2At H2Solution in OResolution and controllable CO at fracture2/H2CO in O-mixed fluid generator 3 and fracturing unit 52/H2O pressure of the mixed fluid.
CO2/H2The O-mix fluid generator includes a reaction vessel 31, a piston 32 installed in the reaction vessel 31, a gas supply line 33, a liquid supply line 34 and a liquid discharge line 35 which are respectively communicated with the reaction vessel 31, and CO2/H2The O-mix fluid generation device 3 further includes a temperature sensor 36 and a pressure sensor 37, and the temperature sensor 36 and the pressure sensor 37 are provided in the reaction vessel 31.
The fracturing device 5 is connected with the liquid discharge pipeline 35, and a sixth valve 38 is arranged on the liquid discharge pipeline 35.
Specifically, fracturing unit 5 includes fracturing gun 51, is provided with packer 52 in the fracturing gun 51, can carry out staged fracturing to the limestone roof, during the use, inserts drilling with fracturing gun 51, opens the airtight drilling of packer 52.
The temperature control system 6 is a water cooling circulation system, and a cooling water pipeline 61 of the temperature control system 6 is wound on the CO2/H2The outer wall of the O-mixed fluid generation device 3 can increase CO by cooling2At H2Solubility in O.
The stirring device 7 comprises a motor 71 arranged at the top of the reaction vessel 31, the output end of the motor 71 is provided with a stirring rod 72, the lower end of the stirring rod 72 penetrates through the top of the reaction vessel 31 and extends into the upper part of the interior of the reaction vessel 31, and the stirring rod 72 is provided with a stirring blade 73.
Preferably, the stirring rod 72 is fixedly connected with a helical stirring blade, and the helical stirring blade is spirally arranged along the axial direction of the stirring rod.
H2The O supply system 4 comprises a water storage tank 41, a second valve 42, a third valve 43, a filter 44, a second one-way valve 45 and a liquid booster pump 46, wherein the second valve 42 and the third valve 43 are respectively arranged at the water inlet and the water outlet of the water storage tank 41, the third valve 43 is connected with the liquid inlet of the liquid booster pump 46, the liquid outlet of the liquid booster pump 46 is connected with the inlet of the second one-way valve 45, and the liquid outlet of the liquid booster pump 46 is connected with the inlet of the second one-way valve 45The outlet of the second check valve 45 is connected to the liquid supply line 34, and the filter 44 is also provided in the connection line between the third valve 43 and the liquid booster pump 46.
CO2The gas supply system 1 comprises CO2Storage tank 11, first valve 12, first check valve 13 and gas booster pump 14, CO2The outlet of the storage tank 11 is connected with the inlet of the gas booster pump 14 through the first valve 12, the outlet of the gas booster pump 14 is connected with the inlet of the first one-way valve 13, and the outlet of the first one-way valve 13 is connected with the gas supply pipeline 33.
The hydraulic oil pressurizing system 2 comprises a hydraulic oil tank 21, an oil inlet 22, a first oil outlet 23, a second oil outlet 24, a third oil outlet 25, a hydraulic oil pressurizing pump 26, a third one-way valve 27, a safety valve 28 and a hydraulic oil unloading valve 29, wherein the first oil outlet 23, the second oil outlet 24 and the third oil outlet 25 are sequentially and upwards arranged on the hydraulic oil tank, the oil inlet 22 above the hydraulic oil tank 21 and the first oil outlet 23 below the hydraulic oil tank 21 are respectively provided with a fourth valve 221 and a fifth valve 231, the oil inlet of the hydraulic oil pressurizing pump 24 is connected with the fifth valve 231, the oil outlet of the hydraulic oil pressurizing pump 24 is connected with the inlet of the third one-way valve 25, and the outlet of the third one-way valve 25 is connected with CO2/H2The O-hybrid fluid generating device 3, the relief valve 26 and the hydraulic oil unloading valve 27 are respectively installed on the pipeline between the second outlet port 24 and the third outlet port 25 of the hydraulic oil tank 21 and the piston 32, and the relief valve 28 ensures the pipeline and the CO2/H2The pressure in the lower cavity of the piston 32 in the O-mixed fluid generating device does not exceed the safe pressure range, and the hydraulic oil unloading valve 29 can automatically control the unloading or loading of the hydraulic oil booster pump 26.
The method for fracturing the limestone top plate by using the carbon dioxide and water mixed fluid provided by the invention comprises the following steps of:
1) selecting a drilling position and drilling parameters, constructing on a limestone top plate of the goaf, setting a fracturing drill hole, and inserting a fracturing device into the drill hole;
2) in CO2/H2Introducing H into an O mixed fluid generating device2O and CO2Production of CO2/H2O mixed fluid；
3) Connecting a fracturing unit and CO2/H2And the O mixed fluid generation device is used for fracturing the limestone top plate.
Thus, CO2/H2CO while fracturing limestone with O-mixed fluid2/H2O mixing fluid with limestone (CaCO)3) The following reactions also occur:
CaCO3+H2O+CO2→Ca(HCO3)2
CO2calcium carbonate CaCO in the course of fracturing3In carbon dioxide CO2And water H2Reacting under O environment to generate calcium bicarbonate Ca (HCO)3)2Can make the limestone top plate form a hole, reduce the strength of the limestone top plate, improve the fracturing effect of the limestone top plate and the greenhouse gas CO used for fracturing2Taking waste gas, CO, generated by combustion of fossil fuel in factory2/H2The lime rock roof fractured by the O mixed fluid has double meanings of preventing and treating mine disasters and protecting the environment.
Further, the step 2) is carried out on CO2/H2Pressure of the O-mixed fluid generating device is adjusted, CO2/H2The pressure of the O mixed fluid generating device is controlled between 0.5MPa and 1.5MPa, and the mixed fluid is stirred at the same time.
Thus, the greater the pressure, the greater the CO2In CO2/H2The greater the solubility in the O mixed fluid, under which conditions CO2The limestone fracturing fluid has high solubility in water, and the mixed fluid has a good fracturing effect on a limestone top plate.
Further, CO in the step 2)2/H2The pressure of the O mixed fluid generating device is controlled between 0.8 and 1.2 MPa.
Under this condition, CO2The limestone fracturing fluid has high solubility, and the mixed fluid has a good fracturing effect on the limestone top plate.
Further, to CO2/H2Temperature of the O-mixed fluid generation device is adjusted, and the CO is mixed2/H2Of devices for generating O-mixturesThe temperature is controlled between 8-15 ℃.
Thus, CO can be controlled by controlling the temperature2At H2Solubility in O with CO2/H2Reduction of temperature of O-mixed fluid, CO2Increased solubility in water, CO at 8-15 deg.C2The limestone fracturing fluid has high solubility in water, and the mixed fluid has a good fracturing effect on a limestone top plate.
Further, the CO is2/H2The temperature of the O-mixed fluid generating device is controlled between 10 and 13 ℃.
Under this condition, CO2The limestone fracturing fluid has high solubility in water, and the mixed fluid has a good fracturing effect on a limestone top plate.
Further, the step 3) comprises the step of adding CO to the fracturing device2/H2Pressure adjustment of O-mix fluid generation device, fracturing device, and CO2/H2The pressure of the O-mixed fluid generating device is controlled to be 50-150 MPa.
Thus, under the fracturing conditions, CO2The solubility in water is further increased, and meanwhile, the fracturing fluid has a good fracturing effect on the limestone top plate under the high-pressure condition.
Further, the step 3) of fracturing the plant and CO2/H2The pressure of the O-mixed fluid generating device is controlled to be 80-120 MPa.
Therefore, under the fracturing condition, the fracturing fluid has a good fracturing effect on the limestone top plate under the high-pressure condition.
The device used by the method comprises the following specific operation steps:
opening the packer 52 in the fracturing gun 51 to seal the drilled hole; opening the third valve 43 to connect the water storage tank 42, the liquid booster pump 46 and the CO2/H2The O-mixed fluid generator 3 opens the second valve 42 and the liquid pressurizing pump 46 to supply H2Transport of O to CO2/H2An O-mix fluid generation device 3; the cooling water circulation pump 62 is turned on; starting a switch of the motor 71 to stir; opening the first valve 12 to turn on CO2A storage tank 11,Gas booster pump 14 and CO2/H2The O-mixed fluid generating device 3 is turned on to supply CO at a predetermined pressure by opening the switch of the gas booster pump 142To CO2/H2The inside of the O-mix fluid generator 3; when CO is present2/H2The O-mix fluid generator 3 and the fracturing gun 51 are filled with CO2/H2O mixing the fluid; opening the fifth valve 231, connecting the hydraulic oil tank 21, the hydraulic oil booster pump 26 and the piston 32, and opening the hydraulic oil booster pump 26 when the CO is detected2/H2And after the O mixed fluid reaches a certain temperature and pressure, opening a sixth valve 38, connecting the fracturing device 5 and the mixed fluid generation device 3, and fracturing the limestone top plate.
Example 1
Selecting a drilling position and drilling parameters, constructing on a limestone top plate of the goaf, setting a fracturing drill hole, and inserting a fracturing device into the drill hole; to CO2/H2H is introduced into the O mixed fluid generating device2O to CO2/H2H is introduced into the O mixed fluid generating device2Introducing CO into O2Stirring the mixed fluid to control CO2/H2The pressure of the O mixed fluid generating device is 0.5MPa, and CO is controlled2/H2The temperature of the O mixed fluid generating device is 8 ℃; connecting a fracturing unit and CO2/H2O mixed fluid generator for controlling CO2/H2The pressure of the O mixed fluid generating device is 50MPa, and the limestone top plate is fractured, so that a good fracturing effect is achieved.
Example 2
Selecting a drilling position and drilling parameters, constructing on a limestone top plate of the goaf, setting a fracturing drill hole, and inserting a fracturing device into the drill hole; to CO2/H2H is introduced into the O mixed fluid generating device2O to CO2/H2H is introduced into the O mixed fluid generating device2Introducing CO into O2Stirring the mixed fluid to control CO2/H2The pressure of the O mixed fluid generating device is 1.5MPa, and CO is controlled2/H2The temperature of the O mixed fluid generating device is 15 ℃; connecting a fracturing unit and CO2/H2O mixed fluid generator for controlling CO2/H2The pressure of the O mixed fluid generating device is 150MPa, and the limestone top plate is fractured, so that a good fracturing effect is achieved.
Example 3
Selecting a drilling position and drilling parameters, constructing on a limestone top plate of the goaf, setting a fracturing drill hole, and inserting a fracturing device into the drill hole; to CO2/H2H is introduced into the O mixed fluid generating device2O to CO2/H2H is introduced into the O mixed fluid generating device2Introducing CO into O2Stirring the mixed fluid to control CO2/H2The pressure of the O mixed fluid generating device is 1MPa, and CO is controlled2/H2The temperature of the O mixed fluid generating device is 12 ℃; connecting a fracturing unit and CO2/H2O mixed fluid generator for controlling CO2/H2The pressure of the O mixed fluid generating device is 100MPa, and the limestone top plate is fractured, so that a good fracturing effect is achieved.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A method for fracturing a limestone top plate by using a carbon dioxide and water mixed fluid is characterized by comprising the following steps:
1) selecting a drilling position and drilling parameters, constructing on a limestone top plate of the goaf, setting a fracturing drill hole, and inserting a fracturing device into the drill hole;
2) in CO2/H2Introducing H into an O mixed fluid generating device2O and CO2Production of CO2/H2O mixed fluid;
3) connecting a fracturing unit and CO2/H2The O mixed fluid generating device is used for fracturing the limestone top plate;
to CO in step 2)2/H2Pressure of the O-mixed fluid generating device is adjusted, CO2/H2The pressure of the O mixed fluid generating device is controlled between 0.5MPa and 1.5 MPa; to CO2/H2Temperature of the O-mixed fluid generating apparatus is adjusted, CO2/H2The temperature of the O mixed fluid generating device is controlled between 8 and 15 ℃; the CO is2Taken from the exhaust gas produced by the combustion of fossil fuels in factories.
2. The method for fracturing a limestone roof with a carbon dioxide and water mixed fluid according to claim 1, wherein in the step 2), the mixed fluid is stirred at the same time.
3. The method for fracturing a limestone roof with a carbon dioxide and water mixed fluid according to claim 2, characterized in that the CO in step 2)2/H2The pressure of the O mixed fluid generating device is controlled between 0.8 and 1.2 MPa.
4. The method of carbon dioxide and water mixed fluid fracturing limestone ceiling according to claim 1 wherein the CO2/H2The temperature of the O-mixed fluid generating device is controlled between 10 and 13 ℃.
5. The method for fracturing a limestone roof with a carbon dioxide and water mixed fluid according to any one of claims 1 to 4, characterized in that the fracturing device and CO are subjected to the step 3)2/H2Pressure adjustment of O-mix fluid generation device, fracturing device, and CO2/H2The pressure of the O-mixed fluid generating device is controlled to be 50-150 MPa.
6. The method for fracturing a limestone roof with a carbon dioxide and water mixed fluid according to claim 5, characterized in that the fracturing unit and CO in step 3)2/H2The pressure of the O-mixed fluid generating device is controlled to be 80-120 MPa.
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| CN105064975B (en) * | 2015-08-17 | 2017-09-05 | 牛辉英 | Unconventionaloil pool layer permeable cement stone pressure break recovery method |
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| CN106285681B (en) * | 2016-11-11 | 2018-05-04 | 中国矿业大学 | A kind of hard coal seam top plate fracturing device and method |
| CN107686724B (en) * | 2017-09-01 | 2020-08-11 | 中国石油天然气股份有限公司 | Ultralow-water-content carbon dioxide fracturing fluid and preparation method thereof |
| CN207832041U (en) * | 2018-01-24 | 2018-09-07 | 西安科技大学 | Coal and rock based on liquid carbon dioxide conducts fracturing device |
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