Gas extraction device with CO2 directional fracturing and hydraulic fracturing coupling anti-reflection

Abstract

This is a gas extraction device using CO2 directional fracturing and hydraulic fracturing coupling anti-reflection. [Solution] The gas extraction device using CO2 directional fracturing and hydraulic fracturing coupling anti-reflection includes a blast hole and a control hole, which are opened symmetrically on both sides of the blast hole, a flying object prevention device provided within the blast hole, a first hole packer fixed to one end of the flying object prevention device, and a coupling anti-reflection assembly, which has one end screwed to one end of the first hole packer far from the flying object prevention device and has a second hole packer screwed to the other end, and the coupling anti-reflection assembly is located at the position where gas is to be extracted, and when extracting from multiple positions, one end of the second hole packer far from the coupling anti-reflection assembly is screwed to one end of the flying object prevention device, and the first hole packer, the coupling anti-reflection assembly, and the second hole packer are sequentially connected to the other end of the flying object prevention device.

Description

[Technical field]

[0001] The present invention relates to the field of gas extraction technology, specifically CO 2 Gas extraction device based on directional fracturing and hydraulic fracturing coupling anti-reflection 2 directional fracturing and hydraulic fracturing coupled permeability enhancement). [Background technology]

[0002] When extracting coalbed gas, the permeability coefficient of the coalbed varies, making it difficult to extract some gases. 2 Coal seam antireflection is performed using methods such as directional fracturing and hydraulic fracturing, but the antireflection effect of a single method is general. Therefore, in the conventional technology, antireflection is performed using multiple methods to greatly improve the antireflection effect, but in the conventional technology, when performing coupling antireflection, all of them are CO 2 Directed fracturing first, followed by CO 2 The directional fracturing device is removed and then the hydraulic fracturing tube is inserted to fracture the rock. In the process, CO 2 The gas generated after directional fracturing may leak, creating a risk. It is necessary to determine the location of the hydraulic fracturing pipe, and CO 2 It is difficult to overlap with the directional fracturing position, which affects the coupling effect and CO 2 When directional fracturing is performed, larger impact forces are generated, which have a significant impact on the anti-fracture devices.

[0003] Therefore, there is a need to provide an improved technical solution to address the shortcomings of the prior art. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to achieve the above object, the present invention provides the following technical solutions: [Means for solving the problem]

[0005] CO 2 1. A gas extraction apparatus by directional fracturing and hydraulic fracturing coupling anti-reflective, comprising: A blast hole and a control hole, the control hole being symmetrically opened on both sides of the blast hole; a flying stopper provided within the blast hole; a first hole packer fixed to one end of the flying object prevention device; a coupled permeability enhancement assembly, one end of which is threadedly attached to the end of the first hole packer remote from the flying object prevention device, and the other end of which is threadedly attached to a second hole packer; Including, The coupling anti-reflection assembly is located at a position where gas is to be extracted, and when extracting gas from a plurality of positions, one end of the second hole packer far from the coupling anti-reflection assembly is screwed to one end of the flying prevention device of the second group, and the first hole packer, the coupling anti-reflection assembly, and the second hole packer of the second group are sequentially connected to the other end of the flying prevention device; The coupling anti-reflection assembly includes: A filling valve; a main pipeline threadedly attached to one end of the filling valve; Heating tubes fixed symmetrically within the main pipeline; four groups of fixed pressure assemblies configured to be circumferentially disposed within the main pipeline; four groups of shield plates arranged circumferentially inside the main pipeline and adapted to contact the fixed pressure assembly; Including, The fixed pressing assembly includes: a sealing plate having a sliding groove formed on a side close to the heat generating tube; a fixed pressing block slidably provided in the sliding groove; a fixed pressure cylinder, one end of which is fixed inside the fixed pressure block and the other end of which has a gas inlet fixed thereto; a guide post, one end of which is slidably provided within the fixed pressure cylinder and the other end of which is fixed within the sliding groove, and a return spring is provided between the guide post and the fixed pressure cylinder; a communication pipe, one end of which is fixed to the sealing plate and the other end of which is fixed to the shielding plate; Including, A communication groove and an energy release groove are formed inside the sealing plate, the communication groove is connected to the communication pipe, and a communication hole is formed on one side of the communication groove to communicate with the sliding groove, The energy release groove is located near the inner wall of the main pipeline, and a gas release groove is opened on one side of the energy release groove and communicates with the sliding groove; The fixed pressing block has a circulation hole and a pressure release hole on both sides, which correspond to the communication hole and the gas release groove, respectively. When the pressure release hole just comes into contact with the gas release groove, the circulation hole and the communication hole are in a separated state. 2 Gas extraction device by directional fracturing and hydraulic fracturing coupling anti-reflection. Beneficial effects

[0006] Liquid CO through the main pipeline 2 and fracturing fluid can be delivered simultaneously, without the need to replace the equipment, avoiding gas leakage situations, and when antireflection is performed at multiple locations, when the liquid in the first group of coupling antireflection assemblies is filled, liquid CO 2 The fracturing fluid exerts pressure on the fixed compression block, compressing the return spring, which in turn releases liquid CO into each of the main pipelines. 2and liquid CO until the fracturing fluid is filled. 2 and fracturing fluid through the connecting tube into the next group of coupling anti-reflection assemblies, and then liquid CO 2 The fixed pressing block is continuously compressed until it is connected to the energy release groove. The energy release hole is used to impact and fractured the coal seam, and then the main pipeline is filled with fracturing fluid and flows out through the fracturing hole to continue fracturing the fracturing position, improving the anti-reflection effect. When impacting the coal seam, the impact force generated through the energy release hole on the slope can be offset to a small extent, thereby reducing the impact on the flying prevention device. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an overall schematic diagram of a gas extraction apparatus by CO2 directional fracturing and hydraulic fracturing coupling anti-reflection. [Diagram 2] FIG. 1 is a schematic diagram of a coupling anti-reflection assembly of a gas extraction apparatus with CO2 directional fracturing and hydraulic fracturing coupling anti-reflection. [Diagram 3] FIG. 1 is a schematic diagram of a fixed pressure assembly of a gas extraction apparatus with CO2 directional fracturing and hydraulic fracturing coupling anti-reflective. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] With reference to Figures 1 to 3, the present invention provides the following technical solutions: CO 2 1. A gas extraction apparatus by directional fracturing and hydraulic fracturing coupling anti-reflective, comprising: The blast hole 1 and the control hole 2 are symmetrically opened on both sides of the blast hole 1, A flying prevention device 3 installed in the blast hole 1; A first hole packer 4 fixed to one end of the flying object prevention device 3; a coupling anti-reflection assembly 5, one end of which is screwed to the end of the first hole packer 4 far from the flying prevention device 3, and the other end of which is screwed to a second hole packer 6; Including, Furthermore, the coupling anti-reflection assembly 5 is located at the position where gas is to be extracted, and when extracting gas from multiple positions, one end of the second hole packer 6 far from the coupling anti-reflection assembly 5 is screwed to one end of the second group of flying object prevention device 3, and the other end of the flying object prevention device 3 is sequentially connected to the first hole packer 4, the coupling anti-reflection assembly 5, and the second hole packer 6 of the second group.

[0009] The coupling anti-reflection assembly 5 is A filling valve 51; a main pipeline 52 screwed to one end of the filling valve 51; Heating tubes 53 fixed symmetrically within the main pipeline 52; four groups of fixed pressure assemblies 54 configured to be circumferentially disposed within the main pipeline 52; Four groups of shield plates 56 are circumferentially arranged inside the front main pipeline 52 and configured to contact the fixed pressure assembly 54; Includes.

[0010] A separation plate 521 is fixed inside the main pipeline 52. The separation plate 521 equally divides the inside of the main pipeline 52 into four regions. Each of the four regions is divided into two symmetric CO 2 The separation plate 521 has two symmetrical fracturing fluid channels and two symmetrical fracturing fluid channels. Both ends of the separation plate 521 extend from the main pipeline 52. The members communicating with the main pipeline 52 are CO 2 The pipeline is divided into four regions identical to the main pipeline 52 for carrying the oil and fracturing fluids, respectively.

[0011] That is, liquid CO 2and fracturing fluid are transported simultaneously in four separate areas, two of which are liquid CO 2 The other two carry fracturing fluids, allowing for CO2 to be pumped without changing the device. 2 To ensure that the effect of directional fracturing and hydraulic fracturing coupling can be achieved.

[0012] The main pipeline 52 is provided with a plurality of energy release holes 55 and fracturing holes located between a fixed pressure assembly 54 and a shield plate 56. The plurality of energy release holes 55 and the plurality of fracturing holes are provided with CO 2 Corresponding to the channel and the fracturing fluid channel, a plurality of energy emission holes 55 are arranged at an inclination, the inclination direction is toward the coupling anti-reflection assemblies 5 of the second group, and the inclination direction of the energy emission holes 55 in the coupling anti-reflection assemblies 5 of the second group is toward the coupling anti-reflection assemblies 5 of the first group.

[0013] The inclination angle of the energy release holes 55 is 1° to avoid the inclination being too large to affect the fracturing direction.

[0014] When coupling reflection prevention is performed at multiple positions, the energy release holes 55 in the coupling reflection prevention assembly 5 can be arranged in groups of two at a relative inclination, thereby making it possible to offset the impact force generated during fracturing and reduce the impact on the flying object prevention device 3.

[0015] The fixed pressure assembly 54 is A sealing plate 541 having a sliding groove on the side close to the heat generating tube 53; A fixed pressing block 544 slidably provided in the sliding groove; a fixed pressure cylinder 545, one end of which is fixed inside the fixed pressure block 544 and the other end of which is provided with a gas inlet; a guide post 546, one end of which is slidably provided within the fixed pressure cylinder 545 and the other end of which is fixed within the sliding groove, and a return spring is provided between the guide post 546 and the fixed pressure cylinder 545; a communication pipe 547, one end of which is fixed to the sealing plate 541 and the other end of which is fixed to the shielding plate 56; Including, A communication groove 542 and an energy release groove 543 are formed inside the sealing plate 541. The communication groove 542 is connected to the communication pipe 547. A communication hole is formed on one side of the communication groove 542, which is connected to the sliding groove. The energy release groove 543 is located near the inner wall of the main pipeline 52, and a gas release groove communicating with the sliding groove is opened on one side of the energy release groove 543.

[0016] On both sides of the fixed pressing block 544, there are provided a circulation hole and a pressure release hole corresponding to the communication hole and the gas release groove, respectively, and just when the pressure release hole comes into contact with the gas release groove, the circulation hole and the communication hole are in a separated state.

[0017] That is, the CO 2 When the channel is filled with liquid, liquid CO 2 The fracturing fluid exerts pressure on the fixed compression block 544, thereby compressing the return spring and causing the CO 2 All channels were filled with liquid CO 2 and liquid CO until the fracturing fluid is filled. 2 and fracturing fluid through the connecting pipe 547 into the next group of coupling anti-reflection assemblies 5, and then liquid CO 2The fixed pressing block 544 is continuously compressed until it is heated to vaporize and expand, and the fixed pressing block 544 is connected to the energy release groove 543. At this time, the flow hole and the communication hole are separated, and the energy release hole 55 impacts the coal seam to fractur e it. After that, the main pipeline 52 is filled with fracturing fluid and flows out through the fracturing hole.

[0018] Before use, gas can be passed through the inside of the fixed pressure cylinder 545, and the amount of gas does not exceed half of the total capacity of the fixed pressure cylinder 545 at maximum.

[0019] The fixed pressure cylinder 545 located in the channel of the fracturing fluid does not need to pass gas in the initial state, and does not need to generate an impact force when flowing out. It controls the fracturing fluid through the return spring, fills the channel of the fracturing fluid in each group of the coupling anti-reflection assembly 5 first, and then allows the fracturing fluid to flow continuously, so that the fracturing fluid can flow out from the crack mouth, and CO 2 The fixed pressure cylinder 545 located inside the channel is filled with gas by an impact force generated as necessary before use, thereby preventing CO 2 Liquid CO in the channel 2 After the gas is vaporized and expanded to a set value, the fixed pressing block 544 is continuously compressed to perform the fracturing operation.

[0020] Specifically, a blast hole 1 and two groups of control holes 2 are opened at the location to be mined, and the device is inserted into the blast hole 1. After reaching the designated location, the hole is sealed with a first hole packer 4 and a second hole packer 6, the device is fixed by a flying prevention device 3, and finally, the coupling anti-reflection assembly 5 is used to detect CO 2 The directional fracturing and hydraulic fracturing coupling is anti-reflective, which improves the efficiency of mining, and when the fracturing fluid appears in the two groups of control holes 2, the hydraulic fracturing is completed and gas extraction begins. [Explanation of symbols]

[0021] 1 Blast Hole 2 Control hole 3. Flying prevention device 4 First hole packer 5 Coupling anti-reflection assembly 6 Second hole packer 51 Filling valve 52 Main Pipeline 53 Heating tube 54 Fixed pressure assembly 55 Energy release hole 56 Shielding plate 521 Separation plate 541 Sealing plate 542 Communication groove 543 Energy Release Groove 544 Fixed Press Block 545 Fixed pressure cylinder 546 Guide Post 547 Communication pipe

Claims

1. CO ２ 1. A gas extraction apparatus by directional fracturing and hydraulic fracturing coupling anti-reflective, comprising: A blast hole and a control hole, the control hole being symmetrically opened on both sides of the blast hole; A flying object prevention device provided within the blast hole; A first hole packer fixed to one end of the flying object prevention device; a coupling anti-reflection assembly, one end of which is screwed to the end of the first hole packer far from the flying object prevention device, and the other end of which is screwed to a second hole packer; Including, The coupling anti-reflection assembly is located at the position where gas is to be extracted, and when extracting from a plurality of positions, one end of the second hole packer far from the coupling anti-reflection assembly is screwed to one end of the flying object prevention device of the second group, and the other end of the flying object prevention device is sequentially connected to the first hole packer, the coupling anti-reflection assembly, and the second hole packer of the second group; The coupling anti-reflection assembly includes: A filling valve; a main pipeline threadedly attached to one end of the filling valve; Heating tubes fixed symmetrically within the main pipeline; four groups of fixed pressure assemblies configured to be circumferentially disposed within the main pipeline; four groups of shield plates arranged circumferentially inside the main pipeline and adapted to contact the fixed pressure assembly; Including, The fixed pressing assembly includes: a sealing plate having a sliding groove formed on a side close to the heat generating tube; a fixed pressing block slidably provided in the sliding groove; a fixed pressure cylinder, one end of which is fixed inside the fixed pressure block and the other end of which has a gas inlet fixed thereto; a guide post, one end of which is slidably provided within the fixed pressure cylinder and the other end of which is fixed within the sliding groove, and a return spring is provided between the guide post and the fixed pressure cylinder; a communication pipe, one end of which is fixed to the sealing plate and the other end of which is fixed to the shielding plate; Including, A communication groove and an energy release groove are formed inside the sealing plate, the communication groove is connected to the communication pipe, and a communication hole is formed on one side of the communication groove and connected to the sliding groove; The energy release groove is located near the inner wall of the main pipeline, and a gas release groove is opened on one side of the energy release groove and communicates with the sliding groove; A CO pressure regulator is provided on both sides of the fixed pressure block, the both sides being provided with a circulation hole and a pressure release hole corresponding to the communication hole and the gas release groove, and the circulation hole and the communication hole are in a separated state just when the pressure release hole comes into contact with the gas release groove. ２ Gas extraction device with directional fracturing and hydraulic fracturing coupling anti-reflection.

2. A separator plate is fixed inside the main pipeline, and the separator plate divides the inside of the main pipeline into four equal regions, and each of the four regions is divided into two symmetric CO ２ a channel and two symmetrical channels for fracturing fluid, and both ends of the separation plate extend from the main pipeline, and a member communicating with the main pipeline is ２ 2. The CO2 pipeline of claim 1, further comprising four zones, the same as the main pipeline, for carrying the oil and fracturing fluids, respectively. ２ Gas extraction device with directional fracturing and hydraulic fracturing coupling anti-reflection.

3. The main pipeline is provided with a plurality of energy release holes and fracturing holes located between the fixed pressure assembly and the shield plate, and the plurality of energy release holes and the plurality of fracturing holes are provided with CO ２ 3. The CO2 analyzer according to claim 2, wherein the energy emission holes correspond to the channels and the fracturing fluid channels, and the energy emission holes are inclined, the inclination direction is toward the coupling anti-reflection assemblies of the second group, and the inclination direction of the energy emission holes of the coupling anti-reflection assemblies of the second group is toward the coupling anti-reflection assemblies of the first group. ２ Gas extraction device with directional fracturing and hydraulic fracturing coupling anti-reflection. 【Request 4】 2. The CO2 gas supply device according to claim 1, wherein gas can be passed through the fixed pressure cylinder before use, and the amount of gas does not exceed half the total capacity of the fixed pressure cylinder at maximum. ２ Gas extraction device with directional fracturing and hydraulic fracturing coupling anti-reflection.

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