CN113790050A - Coal seam fracturing equipment and method based on liquid CO2 phase change - Google Patents
Coal seam fracturing equipment and method based on liquid CO2 phase change Download PDFInfo
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- CN113790050A CN113790050A CN202110883944.8A CN202110883944A CN113790050A CN 113790050 A CN113790050 A CN 113790050A CN 202110883944 A CN202110883944 A CN 202110883944A CN 113790050 A CN113790050 A CN 113790050A
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention belongs to the field of coal mining, and particularly discloses coal bed fracturing equipment based on liquid CO2 phase change, which comprises a chassis, wherein a pipe inserting piece is installed on the upper end face of the chassis, a fracturing anti-reflection pump extends from the upper end face of the pipe inserting piece, one end of the fracturing anti-reflection pump is connected with a conveying pipe, permeation enhancement pipes are fixedly installed on the lower end face of the conveying pipe, a plurality of groups of perforations are arranged on the outer surface of each permeation enhancement pipe in a penetrating mode in an annular array mode, a blocking piece is installed on the outer side of each perforation on the outer surface of each permeation enhancement pipe, a first spiral cylinder and a second spiral cylinder are rotatably embedded on the lower end face of the chassis, braking pieces are installed on the side faces of the chassis, the end portions of the braking pieces are connected with the first spiral cylinder and the second spiral cylinder, and adjusting pieces are arranged on the outer side of the chassis. The invention can improve the fracturing quality, the safety during moving and the convenience during use.
Description
Technical Field
The invention belongs to the field of coal mining, and particularly discloses coal seam fracturing equipment and method based on liquid CO2 phase change.
Background
Coal mines refer to places rich in coal resources and are generally divided into underground coal mines and opencast coal mines. Coal is the most important solid fuel, is one of combustible organic rocks, and can be divided into four types, namely peat, lignite, bituminous coal and anthracite, according to the coal gasification degree. In the coal mining process, liquid CO2 fracturing is adopted to replace hydraulic fracturing, so that liquid CO2 is fractured into a coal seam through coal seam fracturing equipment, after high-pressure CO2 fracturing and crack making, CO2 absorbs heat, changes phase and expands in the stratum, the phase change volume expansion standard of liquid CO2 is close to 600 times, and the durability of artificial cracks is effectively ensured, however, in the existing coal seam fracturing equipment based on liquid CO2 phase change, when the liquid CO2 is fractured from a perforation hole, most of liquid CO2 is easy to splash due to large impact force and fall into the bottom of the hole, so that sufficient liquid CO2 is not fractured into the hole wall to cause the phenomenon of poor fracturing quality, and the existing coal seam fracturing equipment moves in a universal wheel mode, the moving mode is easy to generate a side rollover phenomenon when moving on uneven ground, and the fracturing equipment is easy to incline due to uneven ground so that an anti-reflection pipe cannot smoothly enter a through hole which is pre-drilled on the ground, which causes inconvenient use.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a coal seam fracturing apparatus and method based on liquid CO2 phase change, so as to solve the problems in the prior art.
In order to achieve the aim, the invention provides coal seam fracturing equipment based on liquid CO2 phase change, which comprises a chassis, the upper end surface of the chassis is provided with a pipe inserting piece, the upper end surface of the pipe inserting piece extends to form a fracturing anti-reflection pump, one end of the fracturing permeability-increasing pump is connected with a delivery pipe, the lower end face of the delivery pipe is fixedly provided with a permeability-increasing pipe, a plurality of groups of perforations are arranged on the outer surface of the permeation enhancing pipe in a penetrating way in an annular array, a blocking piece is arranged on the outer side of the perforations on the outer surface of the permeation enhancing pipe, a first spiral cylinder and a second spiral cylinder are rotatably embedded on the lower end surface of the chassis, a braking part is arranged on the side surface of the chassis, the end part of the braking part is connected with a first spiral cylinder and a second spiral cylinder, the outer corner of the chassis is provided with an adjusting part, and spiral blades on the first spiral cylinder and the second spiral cylinder are arranged oppositely.
In above-mentioned technical scheme, it is preferred, the intubate piece bears the frame including extending perpendicularly in the last terminal surface one side edge of chassis one number, the side top edge that bears the frame extends and has a L shape frame No. one, the last terminal surface middle part that bears the frame runs through to rotate inlays and has a threaded rod No. one, the lower tip of a threaded rod rotates with the up end on chassis and is connected, the coaxial extension of the upper end of a threaded rod has a driving motor, a driving motor's side and the side fixed connection of L shape frame No. one.
Preferably, a second bearing frame extends vertically from the edge of the other side of the upper end face of the chassis, a second L-shaped frame extends from the edge of the upper side face of the second bearing frame, a second driving motor is fixedly arranged on the side surface of the second L-shaped frame, a second threaded rod coaxially extends from the end part of the second driving motor, the second threaded rod is rotatably penetrated in the middle of the upper end surface of the second bearing frame, the end part of the second threaded rod is rotatably connected with the upper end surface of the chassis, the outer surface of the second threaded rod and the outer side of the first threaded rod are respectively screwed with a support table, the fracturing anti-reflection pump is fixedly arranged in the middle of the upper end surface of the support table, two sets of sliding lugs extend from the front edge and the rear edge of the supporting platform respectively, sliding grooves are formed in the inner outer surface of the second bearing frame and the inner outer surface of the first bearing frame, and the sliding lugs are attached to the inner outer surfaces of the sliding grooves in a sliding mode.
Preferably, the lower terminal surface of saddle extends and has two sets of solid fixed rings, the conveyer pipe runs through and inlays in two sets of solid fixed ring's inside, the up end of conveyer pipe runs through and inlays and have pressure sensor, pressure sensor is located one of them set of solid fixed ring's the place ahead, the up end of conveyer pipe runs through and inlays and have temperature sensor, temperature sensor is located between two sets of solid fixed rings, the up end of conveyer pipe runs through and inlays and have flow sensor, flow sensor is located another set of solid fixed ring's rear.
Preferably, the blocking piece comprises a drainage disc coaxially embedded on the outer surface of the anti-reflection tube, four groups of fixed convex plates extend from the outer surface of the anti-reflection tube in an annular array mode, a blocking ring extends from the lower end face of each fixed convex plate, the outer surface of the inner portion of each blocking ring is arc-shaped, the blocking rings are located on the outer side of the perforation, the blocking rings are located above the drainage disc under the same vertical line, and the upper end face of the drainage disc is designed to be an inclined plane.
Preferably, two sets of first extending frames extend from the front edges of the two sides of the chassis respectively, two sets of second extending frames extend from the rear edges of the two sides of the chassis respectively, the braking part comprises a first servo motor fixedly mounted on the lower end face of one set of the first extending frames, the end part of the first servo motor is fixedly connected with the end part of the first spiral cylinder, a second servo motor extends from the lower end face of one set of the second extending frames, and the end part of the second servo motor is fixedly connected with the end part of the second spiral cylinder.
Preferably, two first cylinder seats extend from the front edge and the rear edge of the lower end face of the chassis respectively, the first spiral cylinder is rotatably embedded in one first cylinder seat, the second spiral cylinder is rotatably embedded in the other first cylinder seat, a square hole penetrates through the middle of the upper end face of the chassis, and bubble gradienters are installed in the middle of the front end face and the middle of the side face of the chassis.
Preferably, the regulating part is including extending the support frame at the preceding terminal surface of two sets of one extension frame and the rear end face of two sets of two numbers extension frames respectively, the quantity of support frame is four groups, the up end of support frame runs through to inlay and has a screw thread section of thick bamboo, the outside of a screw thread section of thick bamboo symmetry is respectively inlayed and is had two sets of beaded finish, one of them is a set of the lower terminal surface of beaded finish compresses tightly in the up end of support frame, another group the up end of beaded finish compresses tightly in the lower terminal surface of support frame, the inside of a screw thread section of thick bamboo is screwed and is had the support double-screw bolt, the coaxial extension of upper end of support double-screw bolt has the hand wheel, anti-skidding line has been seted up to the surface of hand wheel, the coaxial inlaying of lower tip of support double-screw bolt has the bearing, the outside of bearing is inlayed and is had the spike.
The application method of the coal seam fracturing equipment based on liquid CO2 phase change is further provided, and comprises the following steps: s1: the braking part is utilized to drive the second spiral cylinder and the first spiral cylinder to rotate so as to drive the chassis to move to a working area on uneven ground;
s2: then, the chassis of the adjusting piece is kept in a horizontal state by rotating the adjusting piece, and meanwhile, the pipe inserting piece operates to drive the anti-reflection pipe to move downwards to enter a through hole which is pre-arranged on the ground;
s3: and at the moment, the fracturing permeability-increasing pump runs, liquid CO2 is guided into the permeability-increasing pipe through the conveying pipe and is fractured through the jet holes in the permeability-increasing pipe, and meanwhile, the liquid CO2 enters the coal bed under the action of the resistance piece to complete the fracturing operation on the coal bed.
Compared with the prior art, the invention has the following beneficial effects:
1. through the arranged blocking piece, the liquid CO2 crushed from the perforation on the anti-reflection tube can be blocked by the blocking ring, so that the liquid CO2 flows downwards under the action of the arc-shaped inner part of the blocking ring and falls on the diversion disc, the liquid CO2 cannot flow to the bottom of the perforation, and the liquid CO2 is guided into the coal bed on the hole wall under the action of the inclined surface of the diversion disc, so that the phenomenon that most of the liquid CO2 is splashed and falls into the bottom of the perforation due to large impact force after the liquid CO2 is crushed from the perforation is avoided, the phenomenon that the crushing quality is poor due to the fact that sufficient liquid CO2 is not crushed into the hole wall, and the advantage of improving the crushing quality is achieved.
2. Through the arresting member and a spiral section of thick bamboo that set up, under the combined action of No. two spiral sections of thick bamboos, can drive a spiral section of thick bamboo and No. two spiral sections of thick bamboos through a servo motor and No. two servo motors and carry out the syntropy and rotate, make the spiral leaf on its a spiral section of thick bamboo and No. two spiral sections of thick bamboos can get into not flat subaerial soil layer in, and order about the chassis steadily to move on not flat subaerial under the interact of spiral leaf and soil layer, with this phenomenon of turning on one's side has easily appeared in removing on not flat subaerial, the security when removing has been improved.
3. Through the adjusting part that sets up, can rotate the hand wheel according to the roughness on ground, and then drive the support double-screw bolt and rotate, make its support double-screw bolt utilize and the screw thread performance between the screw thread section of thick bamboo move down, let its support foot that supports double-screw bolt tip move down and contact with ground to support the chassis, with adjusting the chassis to horizontal angle, make its anti-reflection pipe can keep the vertical state and get into to set up in advance and carry out work in the through-hole on ground, with this convenience of use degree that has improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view from another perspective of the present invention;
FIG. 3 is an enlarged view of A of the present invention;
FIG. 4 is a partial view of the present invention;
FIG. 5 is an enlarged view of B of the present invention;
fig. 6 is a bottom view of the present invention.
In the figure: 1. a chassis; 2. a first bearing frame; 3. a saddle; 4. a fracturing permeability-increasing pump; 5. a first spiral cylinder; 6. a support frame; 7. a second spiral cylinder; 8. a first cylinder seat; 9. a first servo motor; 10. a delivery pipe; 11. a fixing ring; 12. a pressure sensor; 13. a temperature sensor; 14. a permeation enhancing tube; 15. a first L-shaped frame; 16. a first threaded rod; 17. a first driving motor; 18. a first extension frame; 19. a threaded barrel; 20. a reinforcement ring; 21. a support stud; 22. a brace; 23. a hand wheel; 24. a second extending frame; 25. a flow sensor; 26. blocking a ring; 27. a drainage tray; 28. fixing the convex plate; 29. a second carrier; 30. a second threaded rod; 31. a second L-shaped frame; 32. a second drive motor; 33. a square hole; 34. a chute; 35. a sliding projection; 36. and a second servo motor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
The coal seam fracturing equipment based on liquid CO2 phase change comprises a chassis 1, wherein a pipe inserting piece is installed on the upper end face of the chassis 1, a fracturing permeability-increasing pump 4 extends from the upper end face of the pipe inserting piece, one end of the fracturing permeability-increasing pump 4 is connected with a conveying pipe 10, a permeability-increasing pipe 14 is fixedly installed on the lower end face of the conveying pipe 10, a plurality of groups of perforation holes are formed in the annular array of the outer surface of the permeability-increasing pipe 14 in a penetrating mode, a blocking piece is installed on the outer side of the perforation holes in the outer surface of the permeability-increasing pipe 14, a first spiral cylinder 5 and a second spiral cylinder 7 are rotatably embedded in the lower end face of the chassis 1, a braking piece is installed on the side face of the chassis 1, the end portion of the braking piece is connected with the first spiral cylinder 5 and the second spiral cylinder 7, an adjusting piece is arranged at the corner of the outer side of the chassis 1, and spiral blades on the first spiral cylinder 5 are opposite to those on the second spiral cylinder 7.
The plug tube spare bears frame 2 including extending perpendicularly in the up end one side edge of chassis 1, bear the side top edge of frame 2 and extend and have L shape frame 15 No. one, bear the up end middle part of frame 2 and run through to rotate and inlay threaded rod 16 No. one, the lower tip of threaded rod 16 rotates with the up end of chassis 1 to be connected, the coaxial extension of the upper end of threaded rod 16 has driving motor 17 No. one, driving motor 17's side and the side fixed connection of L shape frame 15 No. one, L shape frame 15 through setting up can fix driving motor 17 No. one, driving motor 17 can drive threaded rod 16 and rotate No. one.
A second bearing frame 29 vertically extends from the edge of the other side of the upper end face of the chassis 1, a second L-shaped frame 31 extends from the edge of the upper side of the second bearing frame 29, a second driving motor 32 is fixedly mounted on the side face of the second L-shaped frame 31, a second threaded rod 30 coaxially extends from the end portion of the second driving motor 32, the second threaded rod 30 rotatably penetrates through the middle portion of the upper end face of the second bearing frame 29, the end portion of the second threaded rod 30 is rotatably connected with the upper end face of the chassis 1, a pallet 3 is screwed on the outer surface of the second threaded rod 30 and the outer side of the first threaded rod 16, a fracturing anti-reflection pump 4 is fixedly mounted in the middle portion of the upper end face of the pallet 3, two sets of sliding convex blocks 35 respectively extend from the front edge and the rear edge of the pallet 3, sliding grooves 34 are formed in the inner outer surface of the second bearing frame 29 and the inner outer surface of the first bearing frame 2, and the sliding convex blocks 35 are slidably attached to the inner outer surfaces of the sliding grooves 34, can bear fracturing anti-reflection pump 4 through the saddle 3 that sets up, smooth convex block 35 and spout 34 can guarantee that saddle 3 steadily reciprocates, and No. two threaded rods 30 and a threaded rod 16 can make its saddle 3 reciprocate, and No. two driving motor 32 can drive No. two threaded rods 30 and rotate.
The lower terminal surface of saddle 3 extends and has two sets of solid fixed rings 11, conveyer pipe 10 runs through and inlays in the inside of two sets of solid fixed rings 11, the up end of conveyer pipe 10 runs through and inlays and have pressure sensor 12, pressure sensor 12 is located the place ahead of one set of solid fixed ring 11 wherein, the up end of conveyer pipe 10 runs through and inlays and have temperature sensor 13, temperature sensor 13 is located between two sets of solid fixed rings 11, the up end of conveyer pipe 10 runs through and inlays and have flow sensor 25, flow sensor 25 is located the rear of another set of solid fixed ring 11, through the pressure sensor 12 that sets up, temperature sensor 13 and flow sensor 25 can be to the pressure of liquid CO2 in conveyer pipe 10, temperature and flow detect, gu fixed ring 11 can fix conveyer pipe 10.
Hinder the piece including coaxial mosaic at the drainage dish 27 of permeation tube 14 surface, the surface ring array of permeation tube 14 extends and has four fixed flanges 28 of group, the lower terminal surface of four fixed flanges 28 of group extends and has hinders ring 26, the inside surface that hinders ring 26 is seted up for circular-arcly, it is located the outside of perforation to hinder ring 26, it is located the top of drainage dish 27 to hinder ring 26 under the same perpendicular line, the up end of drainage dish 27 is opened and is established to the inclined plane, can fix through the fixed flange 28 that sets up to hindering ring 26, it can block liquid CO2 to hinder ring 26, drainage dish 27 plays the effect of guide.
Two sets of No. one extension frame 18 have been extended respectively to the both sides front edge of chassis 1, the both sides rear edge of chassis 1 has two sets of No. two extension frame 24 of extending respectively, the stopper includes servo motor 9 of the lower terminal surface of one of them set of No. one extension frame 18, the tip of a servo motor 9 and the tip fixed connection of a spiral section of thick bamboo 5, the lower terminal surface of one of them set of No. two extension frame 24 extends No. two servo motor 36, the tip of No. two servo motor 36 and the tip fixed connection of No. two spiral section of thick bamboo 7, can fix servo motor 9 and No. two servo motor 36 through the extension frame 18 that set up and No. two extension frame 24, can fix support frame 6 simultaneously.
The front edge and the back edge of the lower end face of the chassis 1 extend respectively to have two sets of barrel seats 8, 5 helical cylinders rotate to be inlayed in the inside of one set of barrel seat 8, 7 helical cylinders rotate to be inlayed in the inside of another set of barrel seat 8, the up end middle part of the chassis 1 runs through and has seted up square hole 33, bubble spirit level is all installed at the preceding terminal surface middle part and the side middle part of the chassis 1, can watch whether chassis 1 is in the horizontality through the bubble spirit level that sets up, 8 helical cylinders 5 and two helical cylinders 7 can be restricted to one barrel seat, square hole 33 can guarantee that the permeation enhancer tube 14 moves down stably.
The adjusting piece comprises support frames 6 respectively extending from the front end faces of two first extension frames 18 and the rear end faces of two second extension frames 24, the number of the support frames 6 is four, the upper end face of each support frame 6 is embedded with a threaded cylinder 19 in a penetrating manner, the outer side of each threaded cylinder 19 is symmetrically embedded with two groups of reinforcing rings 20 respectively, the lower end face of one group of reinforcing rings 20 is pressed against the upper end face of each support frame 6, the upper end face of the other group of reinforcing rings 20 is pressed against the lower end face of each support frame 6, support studs 21 are screwed in the threaded cylinders 19, hand wheels 23 coaxially extend from the upper ends of the support studs 21, anti-skid grains are arranged on the outer surfaces of the hand wheels 23, bearings are coaxially embedded at the lower ends of the support studs 21, supporting feet 22 are embedded in the outer sides of the bearings, the chassis 1 can be supported through the arranged threaded cylinders 19 and the support studs 21 to keep the chassis horizontal, the reinforcing rings 20 can improve the stability of the joints of the threaded cylinders 19 and the support frames 6, the hand wheel 23 can be convenient for rotate the support stud 21, the supporting foot 22 plays a role in increasing the contact surface, and the bearing can enable the supporting foot 22 not to rotate the support stud 21 to normally rotate after contacting with the ground.
The application method of the coal seam fracturing equipment based on liquid CO2 phase change is further provided, and comprises the following steps: s1: the second spiral cylinder 7 and the first spiral cylinder 5 are driven to rotate by the braking part so as to drive the chassis 1 to move to a working area on uneven ground;
s2: then, the chassis 1 is kept in a horizontal state by rotating the adjusting piece, and meanwhile, the pipe inserting piece operates to drive the permeation enhancing pipe 14 to move downwards to enter a through hole which is arranged on the ground in advance;
s3: at this time, the fracturing anti-reflection pump 4 is operated, liquid CO2 is guided into the permeation-increasing pipe 14 through the conveying pipe 10 and is fractured out through the perforation on the permeation-increasing pipe 14, and meanwhile, the liquid CO2 enters the coal seam under the action of the resistance piece to complete the fracturing operation on the coal seam.
When the device is used, the first spiral cylinder 5 and the second spiral cylinder 7 can be driven to rotate in the same direction by the first servo motor 9 and the second servo motor 36, so that spiral blades on the first spiral cylinder 5 and the second spiral cylinder 7 can enter soil layers on uneven ground, the chassis 1 is driven to stably move on the uneven ground under the interaction of the spiral blades and the soil layers, meanwhile, the chassis 1 can be driven to turn when the turning directions of the second spiral cylinder 7 and the first spiral cylinder 5 are opposite, so that the chassis 1 can be moved to a working area, a user can rotate the hand wheel 23 according to the unevenness of the ground, and further drive the support stud 21 to rotate, so that the support stud 21 moves downwards by utilizing the thread performance between the support stud 21 and the thread cylinder 19, and the support foot 22 at the end part of the support stud 21 can move downwards to be contacted with the ground so as to support the chassis 1, so as to adjust the chassis 1 to a horizontal angle, at the moment, the second driving motor 32 and the first driving motor 17 synchronously operate to drive the second threaded rod 30 and the first threaded rod 16 to operate, so that the supporting platform 3 screwed on the second threaded rod 30 and the first threaded rod 16 can move downwards, the fracturing anti-reflection pump 4 and the permeation-increasing tube 14 are further driven to move downwards, the permeation-increasing tube 14 can enter a through hole which is pre-arranged on the ground, the fracturing anti-reflection pump 4 operates, the liquid CO2 is guided into the permeation-increasing tube 14 through the conveying pipe 10 and is fractured through a jet hole on the permeation-increasing tube 14, the fractured liquid CO2 is blocked by the blocking ring 26, the liquid CO2 flows downwards under the action of the arc-shaped opening inside of the blocking ring 26 and falls on the diversion disc 27, so that the liquid CO does not flow to the bottom of the hole, and the liquid CO2 is guided into the hole wall of the coal seam under the action of the inclined surface of the diversion disc 27 to complete the fracturing operation of the coal seam.
In the present invention, the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the appearances of the phrases "one embodiment," "some embodiments," "a specific embodiment," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment or example, but rather to the same embodiment or example. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The coal bed fracturing equipment based on liquid CO2 phase change comprises a chassis (1) and is characterized in that a pipe inserting piece is installed on the upper end face of the chassis (1), a fracturing permeability-increasing pump (4) extends from the upper end face of the pipe inserting piece, one end of the fracturing permeability-increasing pump (4) is connected with a conveying pipe (10), permeability-increasing pipes (14) are fixedly installed on the lower end face of the conveying pipe (10), a plurality of groups of perforations are formed in the outer surface annular array of the permeability-increasing pipes (14) in a penetrating mode, a blocking piece is installed on the outer side of the outer surface perforations of the permeability-increasing pipes (14), a first spiral cylinder (5) and a second spiral cylinder (7) are rotatably embedded on the lower end face of the chassis (1), a braking piece is installed on the side face of the chassis (1), the end portion of the braking piece is connected with the first spiral cylinder (5) and the second spiral cylinder (7), and adjusting pieces are arranged at corners of the outer side of the chassis (1), the spiral blade on the first spiral cylinder (5) and the spiral blade on the second spiral cylinder (7) are arranged oppositely.
2. The coal seam fracturing equipment based on liquid CO2 phase change is characterized in that the pipe inserting piece comprises a bearing frame (2) vertically extending at one side edge of the upper end face of a chassis (1), an L-shaped frame (15) extends from the upper side edge of the bearing frame (2), a threaded rod (16) penetrates through the middle of the upper end face of the bearing frame (2) in a rotating embedding mode, the lower end portion of the threaded rod (16) is rotatably connected with the upper end face of the chassis (1), a driving motor (17) coaxially extends from the upper end portion of the threaded rod (16), and the side face of the driving motor (17) is fixedly connected with the side face of the L-shaped frame (15).
3. The coal seam fracturing equipment based on liquid CO2 phase change is characterized in that a second bearing frame (29) vertically extends from the edge of the other side of the upper end face of the chassis (1), a second L-shaped frame (31) extends from the edge of the upper side of the second bearing frame (29), a second driving motor (32) is fixedly installed on the side face of the second L-shaped frame (31), a second threaded rod (30) coaxially extends from the end of the second driving motor (32), the second threaded rod (30) rotatably penetrates through the middle of the upper end face of the second bearing frame (29), the end of the second threaded rod (30) is rotatably connected with the upper end face of the chassis (1), a support table (3) is screwed on the outer surface of the second threaded rod (30) and the outer side of the first threaded rod (16), and the fracturing anti-reflection pump (4) is fixedly installed in the middle of the upper end face of the support table (3), two sets of sliding block (35) extend respectively at the front and back edge of saddle (3), spout (34) have all been seted up to the inside surface that bears frame (29) No. two and the inside surface that bears frame (2), sliding block (35) slide fit in the inside surface of spout (34).
4. The coal seam fracturing equipment based on liquid CO2 phase change is characterized in that two sets of fixing rings (11) extend from the lower end face of the saddle (3), the conveying pipe (10) penetrates through and is embedded inside the two sets of fixing rings (11), a pressure sensor (12) penetrates through and is embedded in the upper end face of the conveying pipe (10), the pressure sensor (12) is located in front of one set of fixing rings (11), a temperature sensor (13) penetrates through and is embedded in the upper end face of the conveying pipe (10), the temperature sensor (13) is located between the two sets of fixing rings (11), a flow sensor (25) penetrates through and is embedded in the upper end face of the conveying pipe (10), and the flow sensor (25) is located behind the other set of fixing rings (11).
5. The coal seam fracturing equipment based on liquid CO2 phase change is characterized in that the resistance element comprises a diversion disc (27) coaxially embedded on the outer surface of the permeation enhancing pipe (14), the outer surface of the permeation enhancing pipe (14) extends in an annular array to form four groups of fixed convex plates (28), the lower end faces of the four groups of fixed convex plates (28) extend to form resistance rings (26), the inner outer surface of each resistance ring (26) is provided with a circular arc shape, the resistance rings (26) are located on the outer side of a perforation, the resistance rings (26) are located above the diversion disc (27) under the same vertical line, and the upper end faces of the diversion disc (27) are provided with inclined planes.
6. The coal seam fracturing equipment based on liquid CO2 phase change is characterized in that two groups of first extending frames (18) extend from the front edges of two sides of the chassis (1), two groups of second extending frames (24) extend from the rear edges of two sides of the chassis (1), the braking piece comprises a first servo motor (9) fixedly installed on the lower end face of one group of first extending frames (18), the end portion of the first servo motor (9) is fixedly connected with the end portion of the first spiral cylinder (5), a group of second extending frames (24) extends from the lower end face of the second spiral cylinder (7) to form a second servo motor (36), and the end portion of the second servo motor (36) is fixedly connected with the end portion of the second spiral cylinder (7).
7. The coal bed fracturing equipment based on liquid CO2 phase change is characterized in that two sets of first barrel seats (8) respectively extend from the front edge and the rear edge of the lower end face of the chassis (1), the first spiral barrel (5) is rotatably embedded in one set of first barrel seats (8), the second spiral barrel (7) is rotatably embedded in the other set of first barrel seats (8), a square hole (33) penetrates through the middle of the upper end face of the chassis (1), and bubble level gauges are installed in the middle of the front end face and the middle of the side face of the chassis (1).
8. The coal seam fracturing equipment based on liquid CO2 phase change is characterized in that the adjusting part comprises four support frames (6) respectively extending from the front end faces of two first extension frames (18) and the rear end faces of two second extension frames (24), the number of the support frames (6) is four, a threaded cylinder (19) penetrates through the upper end face of each support frame (6), two reinforcing rings (20) are symmetrically embedded on the outer side of each threaded cylinder (19), the lower end face of one reinforcing ring (20) is pressed against the upper end face of each support frame (6), the upper end face of the other reinforcing ring (20) is pressed against the lower end face of each support frame (6), a support stud (21) is arranged inside each threaded cylinder (19), a hand wheel (23) coaxially extends from the upper end portion of each support stud (21), and anti-skid threads are formed on the outer surface of each hand wheel (23), the lower end part of the support stud (21) is coaxially embedded with a bearing, and the outer side of the bearing is embedded with a supporting foot (22).
9. The use method of the coal seam fracturing equipment based on liquid CO2 phase change is characterized by comprising the following steps: s1: the second spiral cylinder (7) and the first spiral cylinder (5) are driven to rotate by the braking part so as to drive the chassis (1) to move to a working area on uneven ground;
s2: then, the chassis (1) is kept in a horizontal state by rotating the adjusting piece, and meanwhile, the pipe inserting piece operates to drive the permeation enhancing pipe (14) to move downwards to enter a through hole which is arranged on the ground in advance;
s3: and at the moment, the fracturing permeability-increasing pump (4) operates, liquid CO2 is guided into the permeability-increasing pipe (14) through the conveying pipe (10) and is fractured through the jet holes on the permeability-increasing pipe (14), and meanwhile, the liquid CO2 enters the coal seam under the action of the resistance piece to complete the fracturing operation on the coal seam.
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