CN114151057A - Coal rock drilling high-pressure hydraulic fracturing experimental device and application method thereof - Google Patents
Coal rock drilling high-pressure hydraulic fracturing experimental device and application method thereof Download PDFInfo
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- CN114151057A CN114151057A CN202111495258.XA CN202111495258A CN114151057A CN 114151057 A CN114151057 A CN 114151057A CN 202111495258 A CN202111495258 A CN 202111495258A CN 114151057 A CN114151057 A CN 114151057A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The invention discloses a coal rock drilling high-pressure hydraulic fracturing experimental device and a using method thereof, wherein a connecting shell is provided, a fixed pipe is fixedly arranged on the left side wall of the connecting shell, a screw rod is rotatably arranged on the inner wall of the fixed pipe, the side wall of the screw rod is in screwed connection with a sliding pipe, the outer wall of the sliding pipe is in sliding connection with the inner wall of the fixed pipe, a sealing part is respectively and fixedly arranged at the left end of the outer wall of the sliding pipe and the left end of the outer wall of the fixed pipe, the outer wall of the sliding pipe and the outer wall of the fixed pipe are respectively attached to an expansion pipe, a sealing matching part is correspondingly arranged in the expansion pipe and is used for matching with the sealing part so as to fix the expansion pipe on the sliding pipe and the fixed pipe, the side wall of the sliding pipe is provided with a strip-shaped hole, the expansion pipes with different sizes can be adaptively installed and can be transversely butted and installed on the sealing through the sliding pipe, the longitudinal pressing and fixing sealing are avoided, so that the connection position is tighter, reduce the appearance of fold and pore, and simple to operate.
Description
Technical Field
The invention relates to the technical field of coal mine production, in particular to a coal rock drilling high-pressure hydraulic fracturing experimental device and a using method thereof.
Background
Currently, the closest prior art in the industry is: in the coal mine production and water prevention work, reasonably reserving a defense water-proof coal pillar is very important for the safe production of a coal mine and the reasonable development of coal resources, however, the existing experimental device mostly adopts an expansion pipe for experiment, fastening and sealing of two ends of the expansion pipe are required in the experiment, a structure similar to a metal hoop is usually adopted, and pressing, fixing and sealing are carried out from the outside of the expansion pipe, so that the fixing and sealing effects can be realized, the diameters of two ends of the expansion pipe are increased, the plugging of the device for external drilling is not facilitated, the expansion pipe is stressed to expand when contacting a hole wall, the actual numerical value is larger, the pressing and sealing of two ends easily cause the problems of folds and pores of the expansion pipe, the sealing is unstable, multiple layers of sealing are required, the complexity of the experiment is increased, the effect is low, and the expansion pipes of different models are difficult to deal with, therefore, the coal rock drilling high-pressure hydraulic fracturing experimental device and the use method thereof are provided.
Disclosure of Invention
Embodiments according to the present invention aim to solve or improve at least one of the above technical problems.
The first purpose of the embodiment of the invention is to provide a coal rock drilling high-pressure hydraulic fracturing experimental device.
The invention also provides a use method of the coal rock drilling high-pressure hydraulic fracturing experimental device.
The embodiment of the first aspect of the invention provides a coal rock drilling high-pressure hydraulic fracturing experimental device, which comprises: the expansion pipe comprises a connecting shell, wherein a fixed pipe is fixedly installed on the left side wall of the connecting shell, a screw rod is rotatably installed on the inner wall of the fixed pipe, the side wall of the screw rod is in threaded connection with a sliding pipe, the outer wall of the sliding pipe is in sliding connection with the inner wall of the fixed pipe, a sealing part is respectively and fixedly installed at the left end of the outer wall of the sliding pipe and the left end of the outer wall of the fixed pipe, the outer wall of the sliding pipe and the outer wall of the fixed pipe are respectively attached to an expansion pipe, a sealing matching part is correspondingly arranged in the expansion pipe and used for matching with the sealing part so as to fix the expansion pipe on the sliding pipe and the fixed pipe, and a strip-shaped hole is formed in the side wall of the sliding pipe; wherein, the sealing part is used for sealing the sliding tube and the fixed tube, and the sliding tube and the fixed tube are coaxially arranged.
According to the coal rock drilling high-pressure hydraulic fracturing experimental device provided by the invention, the expansion pipes with different sizes can be adaptively installed and transversely butted and installed in a sealing manner through the movable adjustment of the sliding pipe on the inner wall of the fixed pipe, so that the longitudinal pressing and fixing sealing is avoided, the connection part is tighter, the occurrence of folds and pores is reduced, the installation is convenient, the expansion pipes can be straightened and loosened through the movement of the sliding pipe, the expansion pipes can be prevented from loosening and moving laterally when external drilling is plugged, the disassembly labor caused by over-firm fastening when the expansion pipes are disassembled is avoided, the butt sealing of the sealing parts and the sealing matching parts at two ends is adopted, the transverse butt sealing is carried out, and the diameter increase of the device caused by adopting a metal hoop or other circumferential pressing and fixing structures from the outside is avoided, the actual expansion that influences device grafting outside drilling and expansion pipe contacts the coal rock wall, and both ends are sealed and have avoided the inside liquid of sliding tube and fixed pipe to leak, have guaranteed the leakproofness of device.
In addition, the technical solution provided by the embodiment of the present invention may further have the following additional technical features:
in any one of the above technical solutions, the seal engagement portion includes: the sealing ring, sealing ring outer wall fixed connection the expansion pipe inner wall, offer on the sealing and be used for holding the annular seal groove of sealing ring, at least part of sealing ring stretches into make in the annular seal groove the sealing ring is fixed, the annular seal groove with the sliding tube with fixed pipe is coaxial to be set up.
In this technical scheme, through the sealing ring and the stretching into of annular seal groove sealed, can dock fixedly sealing part and sealed cooperation portion on the one hand, on the other hand can play the sealed mating reaction of grafting, carries out the sealed of junction when guaranteeing that stable in structure is fixed, and the inside liquid of protection does not leak to the outside, and the fixed sealed setting at both ends also is favorable to the drive at the both ends of inflation pipe to go on the operation of straightening and pine take off.
In any one of the above technical solutions, the seal engagement portion further includes: the sealing baffle ring is fixedly connected with the inner wall of the expansion pipe, an oblique angle used for being attached to the sealing baffle ring is arranged on the sealing portion, and the oblique angle is arranged on the outer edge of the sealing portion.
In this technical scheme, sealed effect through the laminating of blocking ring lateral wall and oblique angle has played extra sealed, has further guaranteed the leakproofness at expansion pipe both ends, and adopts the oblique angle and seals the laminating of blocking the ring sealed, can reduce the required precision in the operation degree of difficulty and the production in the butt joint is fixed, reduction production and construction cost.
In any one of the above technical solutions, the blocking ring is integrally formed with a plurality of insertion positioning elements, the insertion positioning elements are convexly disposed on the side wall of the blocking ring, the side wall of the sealing portion is provided with a slot, and the inner wall of the slot is inserted into the insertion positioning elements.
In this technical scheme, through the grafting location of a plurality of grafting setting elements to the slot for sealing portion can be accurate dock fixedly with sealed cooperation portion, so that when rigid material and elastic material butt joint, guarantee that each position can both reach predetermined position, reduce inside deviation and interfere.
In any one of the above technical solutions, the seal engagement portion further includes: the extending edge is connected with the blocking ring and extends to form a U-shaped groove with an outward opening.
In this technical scheme, through extending the limit, make the expansion pipe under the effect of inside high-pressure liquid, when outside inflation warp, can contact sliding pipe outer wall, played the additional sealed effect in warping, when sealing and sealed cooperation portion butt joint are fixed, through the U type recess that extends the limit, make and extend limit unilateral cross-section for the U type, when sealing removes in through sealed cooperation portion, can play the effect that the direction removed, structure when reducing the contact is interfered, improve the butt joint success rate.
In any one of the above technical solutions, the inner wall of the strip-shaped hole is provided with a capacity expansion groove, and the capacity expansion groove is formed in one end of the inner wall of the expansion pipe, which is close to the strip-shaped hole.
In this technical scheme, through the dilatation groove, can make the bar hole keep away from the outside in-process of slip pipe, the capacity of dilatation groove crescent to reduce the flow velocity of liquid, can reduce the impact force to the expansion pipe, avoid the expansion pipe crack production in long-term use.
In any one of the above technical solutions, the right end of the side wall of the screw is rotatably provided with the rotation guide ring, the outer wall of the rotation guide ring is fixedly connected with one end of the fixed rod, the other end of the fixed rod is fixedly connected with the inner wall of the fixed pipe, and the rotation guide ring and the fixed pipe are coaxially arranged.
In this technical scheme, through the rotation transmission of screw rod, the screw rod both can carry out the transmission to the slip pipe and remove to carry out the adaptation to the expansion pipe of difference, and the dismouting operation, the screw rod also can stand still, carries out axial removal restriction to the slip pipe, has guaranteed that the slip pipe can not produce random rotation.
In any one of the above technical schemes, the inner wall of the sliding pipe is attached to the transmission ring, one end of the transmission ring is fixedly connected with the inner wall of the transmission ring, the other end of the transmission rod is fixedly provided with the transmission nut, the inner wall of the transmission nut is in threaded connection with the screw rod, the inner wall of the sliding pipe is fixedly provided with the clamping ring used for clamping the transmission ring, and the clamping ring is respectively arranged on the left side wall and the right side wall of the transmission ring.
In this technical scheme, carry out the transmission of cooperation spiro union through drive nut and screw rod, with the help of the transmission of transfer line and driving ring, remove, the slip pipe carries out the centre gripping to the driving ring through two clamp rings of inside setting and fixes, make the rotation of screw rod finally can not drive the slip pipe and produce the rotation, the slip pipe only can produce axial removal and can not produce circumferential rotation, guaranteed that the expansion pipe can not be twistd reverse, only can receive axial pulling force, the setting of transfer line, so that liquid circulates from the transfer line between.
In any one of the above technical solutions, a hand wheel is fixedly installed on the right side wall of the screw rod, and the hand wheel is arranged inside the connecting shell.
In this technical scheme, but the person of facilitating the use drives the screw rod through setting up of hand wheel and rotates, can not block the inside liquid flow of intercommunication shell, when can not producing the resistance to liquid flow, can not driven by the liquid that flows yet, lead to the rotation of screw rod.
The invention provides a use method of a coal rock drilling high-pressure hydraulic fracturing experimental device, which comprises the following steps: s1, rotating the screw rod to enable the sliding pipe to fully extend out of the fixed pipe, and communicating with an external hydraulic pump through the connecting shell; s2, sleeving an expansion pipe on the outer wall of the sliding pipe, and fixing one end of the expansion pipe on the sliding pipe through the sealing matching part and the sealing part; s3, reversing the screw rod to move the sliding tube, enabling the sealing matching part at the other end of the expansion tube to be in butt joint with the sealing part on the fixed tube for fixation, and then reversing again to enable the expansion tube to be straightened; s4, inserting the fixed pipe and the sliding pipe into an external drill hole, and starting a hydraulic pump for testing; s5, after the test is finished, withdrawing liquid through the hydraulic pump, detaching the hydraulic pump, rotating the screw rod so as to separate the fixed pipe and the sliding pipe from the external drilled hole, and loosening the expansion pipe for detaching; the coal rock drilling high-pressure hydraulic fracturing experimental device is used for carrying out experimental tests by adopting the coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in any one of claims.
According to the application method of the coal rock drilling high-pressure hydraulic fracturing experimental device provided by the technical scheme of the invention, as the method steps capable of realizing any one of the technical schemes are included, all technical effects of the application method of the coal rock drilling high-pressure hydraulic fracturing experimental device provided by the second aspect of the invention are not repeated.
Additional aspects and advantages of embodiments in accordance with the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments in accordance with the invention.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the fixing tube and the connecting shell of the present invention after being partially cut away and their connecting structures;
FIG. 3 is a partially cut-away schematic view of the sliding tube and seal of the present invention;
FIG. 4 is an enlarged view taken at A in FIG. 3;
FIG. 5 is a partial cutaway schematic view of the expansion tube and seal engagement of the present invention;
FIG. 6 is an enlarged view of FIG. 5 at B;
fig. 7 is a schematic view of the driving nut and the connection structure thereof according to the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:
the pressure gauge comprises a connecting shell 1, a flange 101, a fixing pipe 2, a screw rod 3, a rotating guide ring 301, a fixing rod 302, a sliding pipe 4, a strip-shaped hole 401, a 4011 expansion groove, a transmission ring 402, a transmission rod 403, a transmission nut 404, a clamping ring 405, a sealing part 5, an annular sealing groove 501, an oblique angle 502, a slot 503, an expansion pipe 6, a sealing matching part 7, a sealing ring 701, a circular bead 7011, a blocking ring 702, an inserting positioning part 703, an extending edge 704, a 7041U-shaped groove 8 hand wheel and a pressure gauge 9.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
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 therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Referring to fig. 1 to 7, an embodiment of the first aspect of the present invention provides a coal rock drilling high-pressure hydraulic fracturing experimental apparatus, including: the expansion pipe comprises a connecting shell 1, wherein a fixed pipe 2 is fixedly installed on the left side wall of the connecting shell 1, a screw rod 3 is installed on the inner wall of the fixed pipe 2 in a rotating mode, a sliding pipe 4 is in threaded connection with the side wall of the screw rod 3, the outer wall of the sliding pipe 4 is in sliding connection with the inner wall of the fixed pipe 2, a sealing part 5 is respectively and fixedly installed at the left end of the outer wall of the sliding pipe 4 and the left end of the outer wall of the fixed pipe 2, the outer wall of the sliding pipe 4 and the outer wall of the fixed pipe 2 are respectively attached to an expansion pipe 6, a sealing matching part 7 is correspondingly arranged in the expansion pipe 6, the sealing matching part 7 is used for being matched with the sealing part 5 so as to fix the expansion pipe 6 on the sliding pipe 4 and the fixed pipe 2, and a strip-shaped hole 401 is formed in the side wall of the sliding pipe 4; wherein, sealing part 5 is used for sealed slide tube 4 and fixed pipe 2, and slide tube 4 and fixed pipe 2 set up coaxially.
According to the coal rock drilling high-pressure hydraulic fracturing experimental device provided by the invention, the expansion pipes 6 with different sizes can be adaptively installed and can be transversely butted and installed in a sealing manner by movably adjusting the sliding pipe 4 on the inner wall of the fixed pipe 2, so that the longitudinal pressing and fixing sealing is avoided, the connection part is tighter, the appearance of folds and pores is reduced, the installation is convenient, the expansion pipes 6 can be straightened and loosened by moving the sliding pipe 4, the expansion pipes 6 can be prevented from being loosened and laterally moved when external drilling is plugged, the disassembly labor caused by over-firm fastening when the expansion pipes 6 are disassembled is avoided, the transverse butt sealing is carried out by adopting the butt sealing of the sealing parts 5 and the sealing matching parts 7 at two ends, and the diameter increase of the device caused by adopting a metal hoop or other circumferential pressing and fixing structures from the outside is avoided, the actual expansion of the influence device grafting outside drilling and expansion pipe 6 contacts the coal rock wall, and both ends are sealed and have avoided the inside liquid leakage of sliding tube 4 and fixed pipe 2, have guaranteed the leakproofness of device.
Specifically, the expansion pipe 6 is made of an existing rubber pipe so as to be elastically deformed and expanded, and when the expansion pipe is used, two ends of the expansion pipe 6 can be pulled outwards so as to be butted and fixed.
Further, install manometer 9 on the connection shell 1, and manometer 9 monitoring end runs through connection shell 1 lateral wall and extends to the intracavity to outside user can be more direct knows the inside actual pressure value of expansion pipe 6.
Further, the mounting flange 101 is fixed outside the connection housing 1 so as to butt-fix the external hydraulic pump.
In any of the above embodiments, as shown in fig. 1 to 7, the seal-fitting portion 7 includes: sealing ring 701, 6 inner walls of sealing ring 701 outer wall fixed connection inflation pipe, offer the annular seal groove 501 that is used for holding sealing ring 701 on the sealing 5, at least part of sealing ring 701 stretches into in the annular seal groove 501 and makes sealing ring 701 fixed, and annular seal groove 501 sets up with sliding tube 4 and fixed pipe 2 is coaxial.
In this embodiment, through the sealed stretching into of sealing ring 701 and annular seal groove 501, can dock fixedly sealing part 5 and sealed cooperation portion 7 on the one hand, on the other hand can play the sealed mating reaction of grafting, carries out the sealed of junction when guaranteeing that stable in structure is fixed, and the inside liquid of protection does not leak to the outside, and the fixed sealed setting at both ends also is favorable to the drive at the both ends of expansion pipe 6 to go on the operation of straightening and pine take off.
Further, fillet 7011 is seted up to sealing ring 701 outer wall to the direction of arc surface slides when butt joint seal groove, makes the process of sealing ring 701 butt joint seal groove can be more smooth.
In any of the above embodiments, as shown in fig. 1 to 7, the seal-fitting portion 7 further includes: the sealing ring 702 and the outer wall of the sealing ring 702 are fixedly connected with the inner wall of the expansion pipe 6, the sealing part 5 is provided with an oblique angle 502 used for being attached to the sealing ring 702, and the oblique angle 502 is arranged on the outer edge of the sealing part 5.
In this embodiment, the side wall of the blocking ring 702 and the bevel 502 are fitted and sealed, so that additional sealing is achieved, the sealing performance at two ends of the expansion pipe 6 is further ensured, the bevel 502 and the blocking ring 702 are fitted and sealed, the operation difficulty and the precision requirement in production can be reduced in butt joint and fixation, and the production and construction cost is reduced.
In any of the above embodiments, as shown in fig. 1 to 7, a plurality of inserting positioning elements 703 are integrally formed on the blocking ring 702, the inserting positioning elements 703 are convexly disposed on the side wall of the blocking ring 702, the slot 503 is formed on the side wall of the sealing portion 5, and the inserting positioning elements 703 are inserted into the inner wall of the slot 503.
In this embodiment, the insertion positioning of the insertion slots 503 by the plurality of insertion positioning members 703 enables the sealing portion 5 to be accurately abutted and fixed with the sealing matching portion 7, so that when the rigid material and the elastic material are abutted, each portion can reach a preset position, and internal deviation and interference are reduced.
In any of the above embodiments, as shown in fig. 1 to 7, the seal-fitting portion 7 further includes: and an extension edge 704, wherein the extension edge 704 is connected with the blocking ring 702, and the extension edge 704 extends to form a U-shaped groove 7041 which is opened outwards.
In this embodiment, through extension limit 704, make expansion pipe 6 under the effect of inside high-pressure liquid, when outwards inflation warp, can contact sliding tube 4 outer wall, played the additional sealed effect in the deformation, when sealing 5 and sealed cooperation 7 butt joint are fixed, through the U type recess 7041 of extension limit 704, make extension limit 704 unilateral cross-section be the U type, when passing sealed cooperation 7 in sealing 5 removes, can play the effect of direction removal, reduce the structure interference when contacting, improve the butt joint success rate.
In any of the above embodiments, as shown in fig. 1 to 7, the inner wall of the strip-shaped hole 401 is provided with an expansion groove 4011, and the expansion groove 4011 is provided at one end of the inner wall of the strip-shaped hole 401 close to the expansion pipe 6.
In this embodiment, through the expansion groove 4011, the capacity of the expansion groove 4011 is gradually increased in the process that the strip-shaped hole 401 is far away from the sliding tube 4 to the outside, so as to reduce the flowing speed of the liquid, reduce the impact force on the expansion tube 6, and avoid the crack generation of the expansion tube 6 in the long-term use process.
In any of the above embodiments, as shown in fig. 1-7, the right end of the side wall of the screw rod 3 is rotatably installed with the rotation guide ring 301, the outer wall of the rotation guide ring 301 is fixedly connected with one end of the fixing rod 302, the other end of the fixing rod 302 is fixedly connected with the inner wall of the fixing tube 2, and the rotation guide ring 301 and the fixing tube 2 are coaxially arranged.
In this embodiment, through the rotation transmission of screw rod 3, screw rod 3 both can carry out the transmission to remove to sliding tube 4 to carry out the adaptation to different inflation pipes 6, and dismouting operation, screw rod 3 also can stand still motionlessly, carries out axial removal restriction to sliding tube 4, has guaranteed that sliding tube 4 can not produce random rotation.
In any of the above embodiments, as shown in fig. 1 to 7, the inner wall of the sliding tube 4 is attached to the driving ring 402, the inner wall of the driving ring 402 is fixedly connected to one end of the driving rod 403, the other end of the driving rod 403 is fixedly installed with the driving nut 404, the inner wall of the driving nut 404 is screwed with the screw rod 3, the inner wall of the sliding tube 4 is fixedly provided with the clamping rings 405 for clamping the driving ring 402, and the clamping rings 405 are respectively disposed on the left and right side walls of the driving ring 402.
In this embodiment, through the screw drive that cooperates of drive nut 404 and screw rod 3, with the help of the transmission of transfer line 403 and driving ring 402, move, slide tube 4 carries out the centre gripping to driving ring 402 through two clamp rings 405 of inside setting fixedly, make the rotation of screw rod 3 finally can not drive slide tube 4 and produce the rotation, slide tube 4 only can produce axial removal and can not produce circumferential rotation, guaranteed that inflation pipe 6 can not be twistd reverse, only can receive axial pulling force, the setting of transfer line 403, so that liquid circulates from transfer line 403 between.
In any of the above embodiments, as shown in fig. 1 to 7, a hand wheel 8 is fixedly installed on the right side wall of the screw rod 3, and the hand wheel 8 is arranged inside the connecting shell 1.
In this embodiment, the setting through hand wheel 8 can facilitate the user and drive screw rod 3 and rotate, can not block the inside liquid flow of intercommunication shell, when can not producing the resistance to liquid flow, also can not be driven by the liquid that flows, leads to the rotation of screw rod 3.
The invention provides a use method of a coal rock drilling high-pressure hydraulic fracturing experimental device, which comprises the following steps: s1, rotating the screw 3 to make the sliding tube 4 fully extend out of the fixed tube 2, and communicating with an external hydraulic pump through the connecting shell 1; s2, sleeving the expansion pipe 6 on the outer wall of the sliding pipe 4, and fixing one end of the expansion pipe 6 on the sliding pipe 4 through the sealing matching part 7 and the sealing part 5; s3, the reverse screw 3 moves the sliding tube 4, so that the sealing matching part 7 at the other end of the expansion tube 6 is in butt joint with the sealing part 5 on the fixed tube 2 for fixation, and then the reverse screw is reversed again to straighten the expansion tube 6; s4, inserting the fixed pipe 2 and the sliding pipe 4 into an external drill hole, and starting the hydraulic pump for testing; s5, after the test is finished, the hydraulic pump is used for withdrawing liquid, the hydraulic pump is detached, the screw rod 3 is rotated, so that the fixed pipe 2 and the sliding pipe 4 are separated from the external drilled hole, and the expansion pipe 6 is loosened for detachment; the coal rock drilling high-pressure hydraulic fracturing experimental device is used for carrying out experimental tests by adopting the coal rock drilling high-pressure hydraulic fracturing experimental device in any one of claims.
According to the application method of the coal rock drilling high-pressure hydraulic fracturing experimental device provided by the embodiment of the invention, since the application method comprises the steps which can be used for realizing any one of the above embodiments, all technical effects of the application method of the coal rock drilling high-pressure hydraulic fracturing experimental device provided by the second aspect of the invention are not repeated herein.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The utility model provides a coal petrography drilling high pressure hydraulic fracturing experimental apparatus which characterized in that includes: a connecting shell (1), a fixed pipe (2) is fixedly arranged on the left side wall of the connecting shell (1), a screw rod (3) is rotatably arranged on the inner wall of the fixed pipe (2), the side wall of the screw rod (3) is in threaded connection with a sliding pipe (4), the outer wall of the sliding pipe (4) is connected with the inner wall of the fixed pipe (2) in a sliding way, the left end of the outer wall of the sliding pipe (4) and the left end of the outer wall of the fixed pipe (2) are respectively and fixedly provided with a sealing part (5), the outer wall of the sliding pipe (4) and the outer wall of the fixed pipe (2) are respectively attached to an expansion pipe (6), a sealing matching part (7) is correspondingly arranged in the expansion pipe (6), the sealing matching part (7) is used for matching with the sealing part (5), so as to fix the expansion pipe (6) on the sliding pipe (4) and the fixed pipe (2), wherein the side wall of the sliding pipe (4) is provided with a strip-shaped hole (401);
wherein the sealing part (5) is used for sealing the sliding pipe (4) and the fixed pipe, and the sliding pipe (4) and the fixed pipe (2) are coaxially arranged.
2. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 1, wherein the sealing matching part (7) comprises: sealing ring (701), sealing ring (701) outer wall fixed connection inflation pipe (6) inner wall, offer on sealing portion (5) and be used for holding annular seal groove (501) of sealing ring (701), at least part of sealing ring (701) stretches into make in annular seal groove (501) sealing ring (701) are fixed, annular seal groove (501) with sliding tube (4) with fixed pipe (2) coaxial setting.
3. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 1, wherein the sealing matching part (7) further comprises: the sealing and blocking ring (702), the outer wall of the sealing and blocking ring (702) is fixedly connected with the inner wall of the expansion pipe (6), an oblique angle (502) used for being attached to the sealing and blocking ring (702) is arranged on the sealing portion (5), and the oblique angle (502) is arranged on the outer edge of the sealing portion (5).
4. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 3, wherein a plurality of inserting positioning pieces (703) are integrally formed on the blocking ring (702), the inserting positioning pieces (703) are convexly arranged on the side wall of the blocking ring (702), a slot (503) is formed in the side wall of the sealing part (5), and the inserting positioning pieces (703) are inserted into the inner wall of the slot (503).
5. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 3, wherein the sealing matching part (7) further comprises: the extending edge (704) is connected with the blocking ring (702), and the extending edge (704) extends to form a U-shaped groove (7041) with an outward opening.
6. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 1, wherein a dilatation groove (4011) is formed in the inner wall of the strip-shaped hole (401), and the dilatation groove (4011) is formed in one end, close to the expansion pipe (6), of the inner wall of the strip-shaped hole (401).
7. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 1, wherein a rotation guide ring (301) is rotatably mounted at the right end of the side wall of the screw rod (3), the outer wall of the rotation guide ring (301) is fixedly connected with one end of a fixed rod (302), the other end of the fixed rod (302) is fixedly connected with the inner wall of the fixed pipe (2), and the rotation guide ring (301) and the fixed pipe (2) are coaxially arranged.
8. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 1, wherein the inner wall of the sliding pipe (4) is attached to a transmission ring (402), one end of the transmission rod (403) is fixedly connected to the inner wall of the transmission ring (402), a transmission nut (404) is fixedly installed at the other end of the transmission rod (403), the screw rod (3) is in threaded connection with the inner wall of the transmission nut (404), a clamping ring (405) used for clamping the transmission ring (402) is fixed to the inner wall of the sliding pipe (4), and the clamping ring (405) is respectively arranged on the left side wall and the right side wall of the transmission ring (402).
9. The coal rock drilling high-pressure hydraulic fracturing experimental device as claimed in claim 1, wherein a hand wheel (8) is fixedly installed on the right side wall of the screw rod (3), and the hand wheel (8) is arranged inside the connecting shell (1).
10. The use method of the coal rock drilling high-pressure hydraulic fracturing experimental device is characterized by comprising the following steps:
s1, rotating the screw (3) to enable the sliding pipe (4) to completely extend out of the fixed pipe (2) and be communicated with an external hydraulic pump through the connecting shell (1);
s2, sleeving an expansion pipe (6) on the outer wall of the sliding pipe (4), and fixing one end of the expansion pipe (6) on the sliding pipe (4) through the sealing matching part (7) and the sealing part (5);
s3, reversing the screw (3) to move the sliding tube (4) so that the sealing matching part (7) at the other end of the expansion tube (6) is in butt joint with the sealing part (5) on the fixed tube (2) for fixation, and then reversing again to straighten the expansion tube (6);
s4, inserting the fixed pipe (2) and the sliding pipe (4) into an external drill hole, and starting a hydraulic pump for testing;
s5, after the test is finished, liquid is recovered through the hydraulic pump, the hydraulic pump is disassembled, the screw (3) is rotated, so that the fixed pipe (2) and the sliding pipe (4) are separated from the external drilled hole, and the expansion pipe (6) is loosened for disassembly;
the coal rock drilling high-pressure hydraulic fracturing experimental device is used for carrying out experimental tests by adopting the coal rock drilling high-pressure hydraulic fracturing experimental device in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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