A synchronous hydraulic fracturing device during drilling process

Abstract

The present invention discloses a synchronous hydraulic fracturing device in the drilling process. During fracturing, after the outer sealing component and the inner plugging component have plugged the borehole, the hydraulic fracturing pump group transports the fracturing fluid through the fracturing outlet hole to the fracturing area between the inner wall of the borehole and the outer wall of the outer cylinder for fracturing treatment. At the same time, the drilling drive mechanism drives the inner cylinder to drive the drill bit component to rotate to realize the simultaneous operation of fracturing and drilling. The present invention can realize fracturing while drilling, and can effectively reduce the construction time of hydraulic fracturing. During fracturing, the present invention adopts the fracturing fluid with proppants such as fine sand and ceramsite added to water. The role of the proppants is that after the hydraulic fracturing forms cracks, the proppants can enter the cracks to play a supporting role, so as to avoid the closure of the cracks affecting the fracturing effect. The rigid structure of the arc-shaped clamping plate is used to make the outer elastic sealing sleeve preliminarily plug the borehole, so as to improve the plugging stability and pressure resistance.

Description

Technical Field

[0001] The present invention specifically relates to a synchronous hydraulic fracturing device during drilling, and relates to the relevant field of hydraulic fracturing equipment. Background Art

[0002] At present, hydraulic fracturing technology is widely used in the fields of oil extraction, shale gas extraction, geothermal resource extraction, gas extraction, hard roof pressure relief, etc., especially in hard roof pressure relief, which mainly includes support method, blasting method, water injection softening method and hydraulic fracturing method. Hydraulic fracturing method is to inject high-pressure water into the target layer through fracturing boreholes to destroy the integrity of the hard roof rock. Its effect on the hard roof is mainly fracturing, and secondly softening. The hydraulic fracturing method is an active method compared to the support method, safer than the blasting method, and more effective than the water injection softening method. Therefore, hydraulic fracturing technology is the most widely used in hard roof pressure relief, and it is also the safest and most reliable, such as hydraulic fracturing technology for initial mining and initial release of working face, hydraulic fracturing technology for final mining of working face, hydraulic fracturing and top cutting pressure relief technology with small coal pillars, etc., which mainly use high-pressure water to cut the hard roof to relieve pressure.

[0003] At present, the construction process of hydraulic fracturing to relieve pressure in hard roof is generally as follows:

[0004] (1) Hydraulic fracturing design, i.e. designing the hydraulic fracturing borehole and the decompression position. The current hydraulic fracturing technology mostly uses double-sealed hole reverse decompression in the application of hard roof decompression, and multiple decompressions are required in one borehole;

[0005] (2) For hydraulic fracturing drilling construction, the borehole diameter is designed according to the specifications of the sealer, and the drilling position and drilling inclination are determined according to the hydraulic fracturing drilling design;

[0006] (3) During hydraulic fracturing, the drill pipe is withdrawn and a sealer is pushed in (there are two commonly used double-seal sealers: one with one water path, i.e., one water path is used for sealing and fracturing; the other with two middle paths, i.e., different water paths are used for sealing and fracturing. One water path has obvious advantages, because the sealer water pipe in the two water paths can easily cause the sealer to get stuck and cannot be pulled out of the borehole). Multiple reverse hydraulic fracturing is performed, and the fracturing time is usually about 30 minutes per time.

[0007] To sum up, hydraulic fracturing construction takes a long time, which will further aggravate the difficulty of coal mining itself. Summary of the invention

[0008] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a synchronous hydraulic fracturing device during the drilling process.

[0009] The present invention is achieved in this way: a synchronous hydraulic fracturing device during the drilling process is constructed, which includes a hydraulic fracturing pump group, an outer cylinder, an inner cylinder, a drill bit assembly, an outer hole sealing assembly, an inner plugging assembly and a drilling drive mechanism, the inner cylinder is coaxially rotatably sleeved inside the outer cylinder, the front end of the inner cylinder is fixedly connected to the drill bit assembly through a linear telescopic drive, the outer end of the outer cylinder is provided with the outer hole sealing assembly at the outer end position of the borehole, the outer hole sealing assembly is used for sealing the outside of the borehole, and is characterized in that the inner plugging assembly is also provided on the outer cylinder near the drill bit assembly, the inner plugging assembly is used for sealing the inside of the borehole, a fracturing chamber is constructed between the outer cylinder and the inner cylinder, and the fracturing chamber is connected to the hydraulic fracturing pump group A central cavity is provided at the center of the inner cylinder, and the central cavity is communicated with the slag discharge through hole at the center of the drill bit assembly. The drilling drive mechanism drives the inner cylinder to drive the drill bit assembly to rotate. A fracturing fluid outlet hole is also provided on the outer cylinder between the outer hole sealing assembly and the inner plugging assembly. During fracturing, after the outer hole sealing assembly and the inner plugging assembly seal the borehole, the hydraulic fracturing pump group transports the fracturing fluid through the fracturing fluid outlet hole to the fracturing area between the inner wall of the borehole and the outer wall of the outer cylinder for fracturing treatment. At the same time, the drilling drive mechanism drives the inner cylinder to drive the drill bit assembly to rotate, and cooperates with the linear telescopic drive to realize simultaneous operation of fracturing and drilling, wherein the fracturing area is located between the outer hole sealing assembly and the inner plugging assembly.

[0010] Furthermore, as a preference, a coolant hole is provided on the outer cylinder on a side of the inner sealing assembly close to the drill bit assembly, and the coolant hole is connected to the fracturing chamber through a coolant control valve so as to transport part of the fracturing fluid to the drill bit assembly to cool the drill bit assembly and discharge chips through the center hole of the inner cylinder.

[0011] Further, as a preference, the drill bit assembly includes a drill disc, a plurality of cutter bits, a connecting tube, an annular sleeve and a cylindrical sleeve, a plurality of cutter bits are fixedly connected in a circumferential array on the outer circumferential wall of the front end of the drill disc, the rear end of the drill disc is connected to an annular sleeve via a connecting tube, the end of the annular sleeve is connected to the cylindrical sleeve, the drill disc, connecting tube, annular sleeve and cylindrical sleeve are coaxially arranged, and a coaxially connected connecting hole cavity is provided in the center of the drill disc, connecting tube, annular sleeve and cylindrical sleeve, the connecting hole cavity is configured as the chip discharge through hole, and the inner diameter of the connecting hole cavity of the annular sleeve is larger than the inner diameter of the connecting hole cavity of the drill disc, connecting tube, annular sleeve or cylindrical sleeve.

[0012] Further, as a preference, each of the cutter heads comprises a cutter head body, a front blade and a side blade, the cutter head body is provided with an engaging slot which is engaged with the drill disc, the front blade and the side blade are provided on the outer side of the front end of the cutter head body, the front blade faces the front end of the drill hole, and the side blade faces the inner hole wall of the drill hole.

[0013] Further, as a preference, the inner sealing assembly comprises an inner sealing elastic sleeve, a sealing control valve and an inner sealing flow channel; the inner sealing elastic sleeve is coaxially provided on the outer cylinder near the drill bit assembly, an expansion chamber is provided between the inner sealing elastic sleeve and the outer wall of the outer cylinder, the outer cylinder is provided with an inner sealing flow channel connecting the expansion chamber and the fracturing chamber, the inner sealing flow channel is provided with a sealing control valve; during internal sealing, the sealing control valve is opened, the liquid in the fracturing chamber flows into the expansion chamber through the inner sealing flow channel, and the inner sealing elastic sleeve is expanded to achieve sealing of the inside of the borehole.

[0014] Further, preferably, a fracturing control valve is provided on the fracturing fluid outlet hole, and the fracturing control valve controls the opening and closing of the fracturing fluid outlet hole.

[0015] Further, as a preference, the external sealing assembly comprises an external elastic sealing sleeve, an arc-shaped clamping plate, a positioning cylinder, a conical positioning sleeve, a radial connecting block and a driving locking mechanism, the positioning cylinder is positioned at the end of the drill hole to be blocked, the conical positioning sleeve is axially movable in the positioning cylinder, the outer peripheral wall of the conical positioning sleeve is a conical structure, the radial connecting block is slidably fitted on the conical outer peripheral surface of the conical positioning sleeve, the radial connecting block is a plurality of radial connecting blocks in a circular array, and the side of the radial connecting block facing the conical positioning sleeve is a wedge-shaped structure, and the positioning cylinder is provided with a radial connecting block for the radial connecting block The radial groove through which the block passes, the radial connection block cannot move axially in the radial groove but can only move along the radial direction, the radial outer end of the radial connection block is fixedly connected to the arc-shaped card plate, the outer side of the circular structure composed of each arc-shaped card plate is provided with the outer elastic sealing sleeve, and the outer elastic sealing sleeve is also provided with an inflation joint, the inflation joint is communicated with the inner cavity of the outer elastic sealing sleeve, and the inner cavity of the outer elastic sealing sleeve can expand and seal the borehole when inflated, and the driving locking mechanism is connected between the positioning cylinder and the conical positioning sleeve, and is used to drive the conical positioning sleeve to move axially. .

[0016] Further, as a preference, the drive locking mechanism includes a locking screw, a locking nut and a driving top plate, a card cover is fixedly provided at one end of the positioning cylinder facing the outside of the drill hole, a plurality of locking screws are axially fixedly extended on the outside of the card cover, the driving top plate is sleeved on the locking screw, and a locking nut for driving and locking the driving top plate is provided on the locking screw, a top sleeve is coaxially extended from the outer end of the conical positioning sleeve, and the end of the top sleeve abuts against the driving top plate, and the driving top plate is driven to move axially by rotating the locking nut, thereby driving the conical positioning sleeve to move axially along the positioning cylinder, and then driving the radial connecting block to move radially outward, thereby realizing rigid expansion of the outer elastic sealing sleeve, and a central through hole for the outer cylinder to extend into and pass through for sealing is provided in the center of the conical positioning sleeve and the driving top plate.

[0017] Furthermore, preferably, the high-pressure fracturing fluid pumped by the hydraulic fracturing pump group is a mixed slurry of proppant added to water, so that the proppant can enter the cracks after fracturing to play a supporting role and avoid crack closure affecting the fracturing effect.

[0018] Further, preferably, the proppant is fine quartz sand or fine ceramsite, and the surface of the fine quartz sand or fine ceramsite is coated with resin.

[0019] The present invention has the following advantages: Compared with similar devices, the synchronous hydraulic fracturing device during drilling provided by the present invention has the following advantages:

[0020] (1) The present invention relates to a synchronous hydraulic fracturing device during drilling. During fracturing, after the outer sealing assembly and the inner plugging assembly seal the borehole, the hydraulic fracturing pump group transports the fracturing fluid through the fracturing outlet hole to the fracturing area between the inner wall of the borehole and the outer wall of the outer cylinder for fracturing treatment. At the same time, the drilling drive mechanism drives the inner cylinder to drive the drill bit assembly to rotate, and cooperates with the linear telescopic drive to achieve simultaneous fracturing and drilling. The fracturing area is located between the outer sealing assembly and the inner plugging assembly, which can achieve simultaneous fracturing while drilling, and can effectively reduce the construction time of hydraulic fracturing.

[0021] (2) During fracturing, the present invention uses a fracturing fluid that adds fine sand, ceramsite and other proppants to water. The proppants can enter the cracks to play a supporting role after the cracks are formed by hydraulic fracturing, thereby preventing the cracks from closing and affecting the fracturing effect. At the same time, fine sand and ceramsite have the characteristics of high temperature resistance, high pressure resistance, corrosion resistance, high strength, high conductivity, low density, and low breakage rate. Coating resin on the surface of sand or ceramsite can further improve the strength and conductivity of the proppant;

[0022] (3) The external sealing assembly of the present invention includes an external elastic sealing sleeve, an arc-shaped clamping plate, a positioning tube, a conical positioning sleeve, a radial connecting block and a driving locking mechanism, which utilizes the rigid structure of the arc-shaped clamping plate to enable the external elastic sealing sleeve to initially seal the borehole, and then inflates the inner cavity of the external elastic sealing sleeve to expand it to further seal the borehole, thereby improving the sealing ability and reliability and ensuring the fracturing pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 is a schematic diagram of the structure of the inner plugging component after expansion of the present invention;

[0025] Figure 3 It is a partial enlarged structural schematic diagram of the inner plugging component of the present invention;

[0026] Figure 4 is a schematic structural diagram of a drill bit assembly of the present invention;

[0027] Figure 5 is a schematic side cross-sectional structural diagram of the external sealing assembly of the present invention;

[0028] Figure 6 It is a schematic diagram of the main cross-sectional structure of the external sealing component of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the attached Figure 1-6 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention provides a synchronous hydraulic fracturing device in the drilling process through improvement, which includes a hydraulic fracturing pump group (not shown in the figure), an outer cylinder 4, an inner cylinder 3, a drill bit assembly 1, an outer hole sealing assembly 10, an inner plugging assembly 6 and a drilling drive mechanism (not shown in the figure, which can generally be set as a combination structure of a motor and a transmission mechanism), the inner cylinder 3 is coaxially rotatably sleeved inside the outer cylinder 4, the front end of the inner cylinder 3 is fixedly connected to the drill bit assembly 1 through a linear telescopic drive 2, the outer end of the outer cylinder 4 is provided with the outer hole sealing assembly 10 at the outer end position of the borehole, and the outer hole sealing assembly 10 is used to seal the outside of the borehole, and is characterized in that the inner plugging assembly 6 is also provided at a position on the outer cylinder 4 near the drill bit assembly, and the inner plugging assembly 6 is used to seal the inside of the borehole, and a There is a fracturing chamber 9, which is connected to the hydraulic fracturing pump group. A central cavity 5 is arranged at the center of the inner cylinder 3, and the central cavity 5 is connected to the chip discharge through hole at the center of the drill bit assembly 1. The drilling drive mechanism drives the inner cylinder to drive the drill bit assembly to rotate. A fracturing fluid outlet hole 14 is also arranged on the outer cylinder between the outer sealing assembly and the inner plugging assembly. During fracturing, after the outer sealing assembly and the inner plugging assembly seal the borehole, the hydraulic fracturing pump group transports the fracturing fluid through the fracturing fluid outlet hole 14 to the fracturing area between the inner wall of the borehole and the outer wall of the outer cylinder for fracturing treatment. At the same time, the drilling drive mechanism drives the inner cylinder to drive the drill bit assembly to rotate, and cooperates with the linear telescopic drive to realize simultaneous operation of fracturing and drilling, wherein the fracturing area is located between the outer sealing assembly and the inner plugging assembly.

[0031] In the present invention, a coolant hole 34 is provided on the outer cylinder 4 on one side of the inner sealing assembly close to the drill bit assembly, and the coolant hole is connected to the fracturing chamber through a coolant control valve 8 so as to transport part of the fracturing fluid to the drill bit assembly to cool the drill bit assembly and discharge the chips through the center hole of the inner cylinder.

[0032] Among them, the drill bit assembly includes a drill disc 20, multiple cutter bits, a connecting tube 19, an annular sleeve 17 and a cylindrical sleeve 18. Multiple cutter bits are fixedly connected in a circular array on the outer circumferential wall of the front end of the drill disc 20. The rear end of the drill disc 20 is connected to the annular sleeve 17 through a connecting tube. The end of the annular sleeve 17 is connected to the cylindrical sleeve 18. The drill disc 20, the connecting tube 19, the annular sleeve 17 and the cylindrical sleeve 18 are coaxially arranged, and a coaxially connected connecting cavity 35 is provided in the center of the drill disc, the connecting tube, the annular sleeve and the cylindrical sleeve. The connecting cavity 35 is configured as the chip discharge through hole, and the inner diameter of the connecting cavity of the annular sleeve is larger than the inner diameter of the connecting cavity of the drill disc, the connecting tube, the annular sleeve or the cylindrical sleeve.

[0033] As a preferred embodiment, each of the cutter heads includes a cutter head body 24, a front blade 21 and a side blade 23. The cutter head body 24 is provided with an engaging slot 22 which is engaged with the drill disc. The front blade 21 and the side blade 23 are provided on the outer side of the front end of the cutter head body 24. The front blade 21 faces the front end of the drill hole, and the side blade 23 faces the inner wall of the drill hole.

[0034] Among them, the inner sealing component 6 includes an inner sealing elastic sleeve 11, a sealing control valve 16 and an inner sealing flow channel 12. The inner sealing elastic sleeve 11 is coaxially sleeved and connected to the position of the outer cylinder near the drill bit assembly. An expansion chamber is set between the inner sealing elastic sleeve 11 and the outer wall of the outer cylinder. The outer cylinder is provided with an inner sealing flow channel 12 connecting the expansion chamber and the fracturing chamber. The inner sealing flow channel 12 is provided with a sealing control valve 16. During internal sealing, the sealing control valve 16 is opened, and the liquid in the fracturing chamber flows into the expansion chamber through the inner sealing flow channel, and the inner sealing elastic sleeve is expanded to achieve sealing of the inside of the borehole.

[0035] The fracturing outlet hole is provided with a fracturing control valve 15 , and the fracturing control valve controls the opening and closing of the fracturing outlet hole 14 .

[0036] As a more preferred embodiment, the outer sealing assembly includes an outer elastic sealing sleeve 26, an arc-shaped clamping plate 32, a positioning cylinder 33, a conical positioning sleeve 27, a radial connecting block 25 and a driving locking mechanism. The positioning cylinder 33 is positioned at the end of the drill hole to be blocked. The conical positioning sleeve 27 is axially movable in the positioning cylinder 33. The outer peripheral wall of the conical positioning sleeve 27 is a conical structure. The conical outer peripheral surface of the conical positioning sleeve 27 is slidably matched with the radial connecting block 25. The radial connecting block 25 is a plurality of circumferential arrays, and the side of the radial connecting block 25 facing the conical positioning sleeve is a wedge-shaped structure. The positioning cylinder is provided with a The radial groove through which the radial connection block passes cannot be moved axially in the radial groove but can only move along the radial direction. The radial outer end of the radial connection block 25 is fixedly connected to the arc-shaped card plate 32. The outer side of the circular structure composed of the arc-shaped card plates 32 is sleeved with the outer elastic sealing sleeve 26. The outer elastic sealing sleeve 26 is also provided with an inflation joint, which is communicated with the inner cavity of the outer elastic sealing sleeve 26. When the inner cavity of the outer elastic sealing sleeve 26 is inflated, it can expand and seal the borehole. The driving locking mechanism is connected between the positioning cylinder and the conical positioning sleeve to drive the conical positioning sleeve to move axially. .

[0037] The driving locking mechanism includes a locking screw 30, a locking nut 29 and a driving top plate 31. A card cover 28 is fixedly provided at one end of the positioning cylinder 33 facing the outside of the drill hole. A plurality of locking screws 30 are axially fixedly extended on the outside of the card cover 28. The driving top plate 31 is sleeved on the locking screw 30. A locking nut 29 for driving and locking the driving top plate is provided on the locking screw 30. A top sleeve 36 is coaxially extended from the outer end of the conical positioning sleeve. The end of the top sleeve 36 abuts against the driving top plate 31. The driving top plate is driven to move axially by rotating the locking nut 29, and then the conical positioning sleeve is driven to move axially along the positioning cylinder, and then the radial connecting block is driven to move radially outward, thereby realizing the rigid expansion of the outer elastic sealing sleeve. A central through hole for the outer cylinder to extend into and seal through is provided in the center of the conical positioning sleeve and the driving top plate.

[0038] The high-pressure fracturing fluid pumped by the hydraulic fracturing pump group is a mixed slurry with proppant added to water, so that the proppant can enter the cracks after fracturing to play a supporting role and avoid the closure of the cracks affecting the fracturing effect.

[0039] The proppant is fine quartz sand or fine ceramsite, and the surface of the fine quartz sand or fine ceramsite is coated with resin.

[0040] The present invention discloses a synchronous hydraulic fracturing device during drilling. During fracturing, after the outer hole sealing component and the inner plugging component have sealed the borehole, the hydraulic fracturing pump group transports the fracturing fluid through the fracturing outlet hole to the fracturing area between the inner wall of the borehole and the outer wall of the outer cylinder for fracturing treatment. At the same time, the drilling drive mechanism drives the inner cylinder to drive the drill bit assembly to rotate, and cooperates with the linear telescopic drive to achieve simultaneous operation of fracturing and drilling, wherein the fracturing area is located between the outer hole sealing component and the inner plugging component, which can achieve simultaneous fracturing while drilling, and can effectively reduce the construction time of hydraulic fracturing. During fracturing, the present invention adopts the method of adding proppants such as fine sand and ceramsite to water for the fracturing fluid, and the role of the proppants After hydraulic fracturing forms cracks, the proppant can enter the cracks to play a supporting role, avoiding the closure of the cracks to affect the fracturing effect. At the same time, fine sand and expanded clay have the characteristics of high temperature resistance, high pressure resistance, corrosion resistance, high strength, high conductivity, low density, low crushing rate, etc. Coating resin on the surface of sand or expanded clay can further improve the strength and conductivity of the proppant; the external sealing component of the present invention includes an external elastic sealing sleeve, an arc-shaped clamping plate, a positioning cylinder, a conical positioning sleeve, a radial connecting block and a driving locking mechanism, which uses the rigid structure of the arc-shaped clamping plate to make the external elastic sealing sleeve initially seal the borehole, and then inflate the inner cavity of the external elastic sealing sleeve to make it expand to further seal the borehole, improve the sealing ability and reliability, and ensure the fracturing pressure.

[0041] The above shows and describes the basic principle, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A synchronous hydraulic fracturing device during drilling, comprising a hydraulic fracturing pump group, an outer cylinder, an inner cylinder, a drill bit assembly, an outer hole sealing assembly, an inner plugging assembly and a drilling drive mechanism, wherein the inner cylinder is coaxially rotatably sleeved with the inner cylinder, the front end of the inner cylinder is fixedly connected with the drill bit assembly through a linear telescopic drive, and the outer cylinder is provided with an outer hole sealing assembly at the outer end of the borehole, characterized in that: An inner plugging assembly is also provided on the outer cylinder near the drill bit assembly, a fracturing chamber is formed between the outer cylinder and the inner cylinder, the fracturing chamber is connected to the hydraulic fracturing pump assembly, a central chamber is provided at the center of the inner cylinder, the central chamber is connected to the chip discharge through hole at the center of the drill bit assembly, the drilling drive mechanism drives the inner cylinder to drive the drill bit assembly to rotate, and a fracturing fluid outlet hole is also provided on the outer cylinder between the outer hole sealing assembly and the inner plugging assembly; The inner plugging assembly includes an inner sealing elastic sleeve, a plugging control valve and an inner plugging flow channel. The inner sealing elastic sleeve is coaxially connected to the position of the outer cylinder near the drill bit assembly. An expansion chamber is set between the inner sealing elastic sleeve and the outer wall of the outer cylinder. The outer cylinder is provided with an inner plugging flow channel connecting the expansion chamber and the fracturing chamber. The plugging control valve is provided on the inner plugging flow channel. The outer sealing hole component comprises an outer elastic sealing sleeve, an arc-shaped clamping plate, a positioning cylinder, a conical positioning sleeve, a radial connecting block and a driving locking mechanism. The positioning cylinder is positioned at the end of the drill hole to be sealed, and a conical positioning sleeve is arranged axially movable in the positioning cylinder. The outer peripheral wall of the conical positioning sleeve is a conical structure, and a radial connecting block is slidably matched on the conical outer peripheral surface of the conical positioning sleeve. The radial connecting blocks are a plurality of circular arrays, and the radial connecting block is a wedge-shaped structure on the side facing the conical positioning sleeve. A radial groove for the radial connecting block to pass through is arranged on the positioning cylinder, and the radial connecting block cannot move axially in the radial groove and can only move radially. The radial outer end of the radial connecting block is fixedly connected to the arc-shaped clamping plate, and the outer side sleeve of the circular structure composed of each arc-shaped clamping plate is provided with an outer elastic sealing sleeve, and an inflation joint is also arranged on the outer elastic sealing sleeve, and the inflation joint is connected with the inner cavity of the outer elastic sealing sleeve, and the inner cavity of the outer elastic sealing sleeve can expand and seal the drill hole when inflated, and the driving locking mechanism is connected between the positioning cylinder and the conical positioning sleeve, and is used to drive the conical positioning sleeve to move axially.

2. The synchronous hydraulic fracturing device during drilling according to claim 1, characterized in that: A coolant hole is provided on the outer cylinder on one side of the inner sealing assembly close to the drill bit assembly. The coolant hole is connected to the fracturing chamber through a coolant control valve so that part of the fracturing fluid can be transported to the drill bit assembly to cool the drill bit assembly and discharge the chips through the center hole of the inner cylinder.

3. The synchronous hydraulic fracturing device during drilling according to claim 2, characterized in that: The drill bit assembly includes a drill disc, multiple cutter bits, a connecting tube, an annular sleeve and a cylindrical sleeve. Multiple cutter bits are fixedly connected in a circular array on the outer circumferential wall of the front end of the drill disc. The rear end of the drill disc is connected to the annular sleeve through the connecting tube. The end of the annular sleeve is connected to the cylindrical sleeve. The drill disc, the connecting tube, the annular sleeve and the cylindrical sleeve are coaxially arranged, and the centers of the drill disc, the connecting tube, the annular sleeve and the cylindrical sleeve are provided with coaxially connected communicating holes. The communicating holes are configured as chips discharge through holes, and the inner diameter of the communicating holes of the annular sleeve is larger than the inner diameter of the communicating holes of the drill disc, the connecting tube or the cylindrical sleeve.

4. The synchronous hydraulic fracturing device during drilling according to claim 3, characterized in that: Each cutter head includes a cutter head body, a front cutting edge and a side cutting edge. The cutter head body is provided with an engaging slot which is engaged with the drill disc. The front cutting edge and the side cutting edge are provided on the outer side of the front end of the cutter head body. The front cutting edge faces the front end of the drill hole, and the side cutting edge faces the inner hole wall of the drill hole.

5. The synchronous hydraulic fracturing device during drilling process according to claim 1, characterized in that: A fracturing control valve is provided on the fracturing outlet hole, and the fracturing control valve controls the opening and closing of the fracturing outlet hole.

6. The synchronous hydraulic fracturing device during drilling according to claim 1, characterized in that: The driving locking mechanism includes a locking screw, a locking nut and a driving top plate. A card cover is fixedly provided at one end of the positioning cylinder facing the outside of the drill hole. A plurality of locking screws are axially fixedly extended on the outside of the card cover. A driving top plate is sleeved on the locking screw. A locking nut for driving and locking the driving top plate is provided on the locking screw. A top sleeve is coaxially extended from the outer end of the conical positioning sleeve. The end of the top sleeve abuts against the driving top plate. The driving top plate is driven to move axially by rotating the locking nut, and then the conical positioning sleeve is driven to move axially along the positioning cylinder, and then the radial connecting block is driven to move radially outward, thereby realizing rigid expansion of the external elastic sealing sleeve. A central through hole for the outer cylinder to extend into and pass through for sealing is provided in the center of the conical positioning sleeve and the driving top plate.

7. The synchronous hydraulic fracturing device during drilling according to claim 1, characterized in that: The high-pressure fracturing fluid pumped by the hydraulic fracturing pump group is a mixed slurry with proppants added to water, so that the proppants can enter the cracks after fracturing to play a supporting role and avoid the closure of the cracks affecting the fracturing effect.

8. The synchronous hydraulic fracturing device during drilling according to claim 7, characterized in that: The proppant is fine quartz sand or fine ceramsite, and the surface of the fine quartz sand or fine ceramsite is coated with resin.

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