CN112855061A - Hydraulic cutting recovery system and method for ground gas extraction shear failure drilling - Google Patents
Hydraulic cutting recovery system and method for ground gas extraction shear failure drilling Download PDFInfo
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- CN112855061A CN112855061A CN202110038264.6A CN202110038264A CN112855061A CN 112855061 A CN112855061 A CN 112855061A CN 202110038264 A CN202110038264 A CN 202110038264A CN 112855061 A CN112855061 A CN 112855061A
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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
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/08—Cutting or deforming pipes to control fluid flow
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Abstract
The invention discloses a hydraulic cutting recovery system and a hydraulic cutting recovery method for a ground gas extraction shear failure drilling well, wherein the hydraulic cutting recovery system comprises a well hole repairing part and a ground control part; the well hole repairing part comprises a main supporting rod and a hydraulic cutting repairing device, and the hydraulic cutting repairing device comprises an upper positioning part, a lower rotating part and a water jet spray gun; the ground control part comprises a water jet high-pressure pump station, a main stay bar rotating device and a centralized electric control unit. According to the method, after the depth of the fault-breaking deformation area, the specific cutting height and the cutting azimuth angle of the end face and the hole wall to be cut are determined through computer modeling according to image data fed back by video detection, a repairing mode of performing hydraulic cutting on the gas extraction drilling fault-breaking deformation area is adopted, so that the communication of the fault-breaking deformation section of the fault-breaking well hole of the gas extraction drilling fault-breaking deformation area is realized through an inclined transition channel formed by a hydraulic cutting surface, and the method is particularly suitable for repairing the well hole of the gas extraction drilling with serious fault-breaking deformation.
Description
Technical Field
The invention relates to a hydraulic cutting recovery system and a hydraulic cutting recovery method, in particular to a hydraulic cutting recovery system and a hydraulic cutting recovery method which are suitable for repairing a fault-broken deformation area of a ground gas extraction shear failure well so as to recover the extraction capacity of the ground gas extraction shear failure well, and belongs to the technical field of coal mine gas disaster prevention and control and efficient development.
Background
Coal bed gas can be released into a mining space in the coal mining process to cause the gas to exceed the limit, thereby bringing dangerous hidden danger to mine production and seriously restricting the safety production of coal mines. Gas extraction is a fundamental measure for preventing and treating mine gas disasters, and the existing coal seam gas mining methods mainly comprise two methods: the method comprises the steps of firstly, performing negative pressure extraction through ground drilling and secondly, performing negative pressure extraction through underground drilling. The method for performing negative pressure extraction by using the ground gas extraction well basically comprises the steps of drilling a hole from the ground and vertically drilling the hole downwards to construct a well body, stopping drilling at a position 10-30 m above a coal seam, wherein the depth of the well body generally exceeds 300m, then arranging a sleeve in the well body of the well to reinforce the well body and using the sleeve as a unique flow channel for gas to flow from the underground to the ground.
After the underground coal face is pushed to pass through a coal seam below a gas extraction well, the overlying strata of the stope collapse and sink, a collapse zone, a fracture zone and a bending sink zone are formed in the vertical direction, and the ground gas extraction well can realize large-flow and high-concentration pressure relief gas extraction by utilizing a fracture channel network formed by the movement of the overlying strata of the stope. However, the overburden movement in the stope can also generate shearing, extrusion, stretching and other acting forces on the drilling well, and the well casing can be easily deformed by shearing, extrusion and the like. Once the well casing deforms, the extracted gas flow can generate large local resistance in the casing deformation area, so that the extraction negative pressure of the extraction pump is increased, the extraction flow is reduced, and the gas extraction capacity is greatly reduced. Data statistics shows that the shear deformation is the deformation form with the maximum occurrence probability of well casing deformation and is also the main deformation form which causes extraction negative pressure to rise and influences the gas extraction effect. If the relative movement amount of the adjacent rock stratum is large, the shearing deformation amount of a well casing can be increased, and even a gas flow channel can be completely broken and blocked, so that the gas extraction well drilling completely loses extraction capability.
In the actual engineering application of well drilling pressure relief gas extraction, once the flow is greatly reduced or even the extraction capacity is lost due to deformation and breakage of a well casing, the gas extraction well drilling is abandoned and treated as a waste well, and because the gas extraction well drilling construction is usually completed before stoping of a coal face, the effect of well drilling extraction to reduce the gas emission quantity in a well cannot be exerted, and huge economic loss is caused. Therefore, the well body dislocation deformation area of the deformed and broken gas extraction well is repaired, the extraction capability of the deformed and broken gas extraction well is recovered, and the economic benefit and the social significance are remarkable.
In the prior art, the restoration of a vertical well bore is mostly seen in the exploitation of oil and natural gas, because the exploitation of oil and natural gas usually adopts water injection or gas injection to an oil field to supplement and reasonably utilize formation energy and improve the recovery rate and the development speed, and in the exploitation process of oil and natural gas, after fracturing treatment of an oil-gas-containing formation, a fracturing propping agent containing ceramsite sand is pressed under high pressure to carry out filling support so as to prevent cracks of the oil-gas-containing formation from closing due to stress release, so that the exploitation of oil and natural gas cannot cause collapse and subsidence of an overlying formation above the oil field, and the conventional earth crust motion usually only causes slight extrusion, shrinkage and deformation of a well bore casing of a production well and cannot cause large deformation, such as coal mine gas extraction well drilling, and shearing breakage. Therefore, the well body repair of the production well for oil and gas exploitation is mostly carried out by adopting a method of extruding a reducing deformation sleeve by using repair equipment such as a hydraulically controlled roller or an expansion mechanism and the like to restore the roundness of the reducing deformation sleeve, however, for the well hole which is cut and broken or even completely dislocated, on one hand, the repair equipment is inconvenient to enter a broken area, and on the other hand, even if the repair equipment enters the broken area, the repair mode of expanding and shaping cannot complete the repair of the dislocated broken well hole.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a hydraulic cutting recovery system and method for a ground gas extraction shearing failure well, which can repair a fault deformation area of a well body of a fault deformed gas extraction well, so that the fault deformed gas extraction well recovers the extraction capacity, and is particularly suitable for repairing a well hole of the gas extraction well with serious fault deformation.
In order to achieve the aim, the surface gas extraction shear failure drilling hydraulic cutting recovery system comprises a well hole repairing part and a ground control part;
the well hole repairing part comprises a main supporting rod and a hydraulic cutting repairing device coaxially and fixedly arranged at the bottom end of the main supporting rod;
the hydraulic cutting repair device comprises an upper positioning part, a lower rotary part and a water jet spray gun; a plurality of positioning clamping jaws which are arranged in a central symmetry manner are arranged on the machine body of the upper positioning part along the circumferential direction of the machine body, the positioning clamping jaws are arranged on the machine body of the upper positioning part through clamping jaw synchronous radial telescopic mechanisms, clamping jaw synchronous radial telescopic driving parts are arranged on the clamping jaw synchronous radial telescopic mechanisms, and the plurality of positioning clamping jaws can synchronously extend out or retract along the machine body radial direction of the upper positioning part by controlling the actions of the clamping jaw synchronous radial telescopic driving parts; the lower rotating part comprises a spray gun rotation control component coaxially and fixedly arranged at the bottom end of the upper positioning part machine body, a rotating frame is fixedly arranged on a rotation output shaft of the spray gun rotation control component, and the rotating frame can circumferentially rotate around the central axis of the spray gun rotation control component by controlling the action of the spray gun rotation control component; the gun body of the water jet spray gun with a tubular structure is hinged and installed on the rotary frame, a spray gun swing control component is also arranged between the gun body of the water jet spray gun and the rotary frame, the spray gun swing control component is of a telescopic cylinder structure, and the water jet spray gun can swing around the hinge center of the spray gun swing control component in the up-and-down direction by controlling the telescopic action of the spray gun swing control component;
the ground control part comprises a water jet high-pressure pump station, a main stay bar rotating device and a centralized electric control unit; the main support rod rotating device is positioned at a wellhead position of a gas extraction well, the main support rod penetrates into the gas extraction well, the top of the main support rod is connected with the main support rod rotating device in an installing manner, and a main support rod lifting control mechanism is further arranged on the main support rod or the main support rod rotating device; the input end of the water jet high-pressure pump station is communicated and connected with the water storage tank, and the output end of the water jet high-pressure pump station is hermetically installed and connected with the input end of the water jet spray gun through a high-pressure water delivery pipe penetrating into the gas extraction well; the centralized electric control unit comprises a central control computer, a main support rod rotation control loop, a main support rod lifting control loop, a hydraulic cutting repair device control loop and a high-pressure water jet control loop, wherein the central control computer is respectively and electrically connected with the main support rod rotation device, the main support rod lifting control mechanism, the clamping jaw synchronous radial expansion driving part, the spray gun rotation control part and the spray gun swing control part.
As a further improvement scheme of the hydraulic cutting repairing device, a video probe is further arranged on the hydraulic cutting repairing device, the centralized electric control unit further comprises a video detection control loop, and the central control computer is electrically connected with the video probe.
The upper positioning part of the three-jaw chuck structure comprises a rotating disk, the jaw synchronous radial telescopic mechanism comprises a disk surface spiral positioning groove arranged on the disk surface of the rotating disk and jaw spiral positioning grooves arranged on the positioning jaws, the three positioning jaws symmetrically arranged relative to the center of the rotating disk are matched and clamped on the disk surface of the rotating disk through the jaw spiral positioning grooves, and the jaw synchronous radial telescopic driving part is a rotary driving part capable of driving the rotating disk to rotate.
As another embodiment of the upper positioning portion of the present invention, the positioning jaw is a parallelogram structure, the positioning jaw comprises a vertically arranged jaw body and two parallel hinged connecting rods, one end of each of the two hinged connecting rods which are separately arranged up and down is respectively hinged and installed on the jaw body, the other end is respectively hinged and installed on the machine body of the upper positioning portion, the jaw body, the hinged connecting rods and the machine body of the upper positioning portion jointly enclose a parallelogram hinged structure, when the hinged connecting rods swing upwards, the jaw body retracts into the machine body close to the upper positioning portion, and when the hinged connecting rods swing downwards, the jaw body extends out from the machine body of the upper positioning portion; the jack catch synchronous radial telescopic mechanism is a link mechanism which can synchronously control the swing of the hinged connecting rods of a plurality of positioning jack catches, the jack catch synchronous radial telescopic driving part is a telescopic cylinder which can drive the hinged connecting rods of the positioning jack catches to swing, the cylinder body end of the telescopic cylinder is fixedly arranged on the upper positioning part, and the telescopic end is respectively hinged with the hinged connecting rods of the plurality of positioning jack catches through the link mechanism.
As a further improvement scheme of the invention, the main supporting rod is of a hollow straight pipe structure; the machine body axis position of the upper positioning part is provided with a through hole which integrally penetrates through the upper positioning part, the spray gun rotation control component is a hollow shaft speed reducing motor, and the axis positions of the upper positioning part and the lower rotation part form a high-pressure water delivery pipe channel which can allow a high-pressure water delivery pipe to pass through; the high-pressure water pipe penetrates through the main support rod and the high-pressure water pipe channel and then is hermetically installed and connected with the input end of the water jet spray gun.
As a further improvement scheme of the invention, the main supporting rod is of a hollow straight pipe structure; the machine body axis position of the upper positioning part is provided with a through hole which integrally penetrates through the upper positioning part, the spray gun rotation control component is a hollow shaft speed reducing motor, and the axis positions of the upper positioning part and the lower rotation part form a high-pressure water delivery pipe channel which can allow a high-pressure water delivery pipe to pass through; the output end of the water jet high-pressure pump station is connected with the inner cavity of the main support rod in a sealing installation mode through a high-pressure water pipe, the bottom end of the main support rod is connected with the high-pressure water pipe in the high-pressure water pipe channel in a sealing rolling installation mode, and the bottom end of the high-pressure water pipe is connected with the input end of the water jet spray gun in a sealing installation mode.
A hydraulic cutting recovery method for a ground gas extraction shear failure drilling well specifically comprises the following steps:
a. preparation of repair: firstly, determining the depth of a fault-breaking deformation area, and the specific cutting height and cutting azimuth angle of an end face and a hole wall to be cut off, mounting a hydraulic cutting repair device at the bottom end of a main support rod, mounting a high-pressure water delivery pipe and a water jet spray gun, then lowering the main support rod into a gas extraction well, positioning the hydraulic cutting repair device at a set position in the fault-breaking deformation area according to the specific cutting height of the end face and the hole wall to be cut off, positioning and mounting the top of the main support rod through a main support rod rotating device, and then connecting each water path pipeline and a circuit;
b. hydraulic cutting and repairing: the central control computer controls the main support rod rotating device to drive the main support rod to rotate according to a specific cutting azimuth angle of an end face and a hole wall to be cut off, controls the spray gun swing control component to drive the water jet spray gun to swing so that the spraying direction of the water jet spray gun is opposite to the position of the staggered well hole, and controls the action of the clamping jaw synchronous radial telescopic driving component to enable the plurality of positioning clamping jaws to synchronously extend out along the radial direction of the machine body of the upper positioning part and to be stably supported on the inner wall of the well hole; then the central control computer controls and starts the water jet high-pressure pump station, controls the high-pressure water to be sprayed out from the water jet spray gun through the high-pressure water pipe to carry out hydraulic cutting on the end surface and the hole wall to be cut, and realizes the arc-shaped cutting track of the water jet spray gun by controlling the rotation of the spray gun rotation control component in the hydraulic cutting process;
c. equipment recovery: after the end face and the hole wall which need to be cut off are cut off, the broken hole of the broken deformation area of the gas extraction drilling well is communicated with the broken deformation section through an inclined transition channel formed by a hydraulic cutting surface, the central control computer firstly controls to close a water jet high-pressure pump station, then controls the synchronous radial telescopic driving part of the clamping jaws to act so that the plurality of positioning clamping jaws are synchronously retracted and reset along the radial direction of the machine body of the upper positioning part, and finally recovers the upper well of the main supporting rod through the lifting control mechanism of the main supporting rod.
As a further improvement scheme of the invention, when the end face and the hole wall to be cut off are subjected to hydraulic cutting in the step b, the butt joint position of the staggered well holes is subjected to hydraulic cutting breakdown, and then the water jet spray gun is used for reaming the broken through holes in the circumferential direction by controlling the spray gun rotation control component to rotate forward and backward within the central angle range of 0-180 degrees; after the through hole which is punctured is reamed in the circumferential range, the spray gun swing control component is controlled to drive the water jet spray gun to swing upwards or downwards to a set angle and to be positioned, and then the spray gun rotation control component is controlled repeatedly to rotate forwards and backwards in a central angle range of 0-180 degrees, so that the water jet spray gun reams the punctured through hole in the radial direction until the end face and the hole wall which need to be cut are cut off completely.
As a further improvement scheme of the invention, in the step b, after hydraulic cutting of the inclined transition channel is completed, the water jet high-pressure pump station is controlled to be closed, then the jaw synchronous radial telescopic driving part is controlled to act to enable the plurality of positioning jaws to be synchronously retracted and reset, the main supporting rod is lifted upwards for a set distance through the main supporting rod lifting control mechanism, then the jaw synchronous radial telescopic driving part is controlled to act again to enable the plurality of positioning jaws to be synchronously extended and positioned, then hydraulic cutting is performed again on the hole wall above the inclined transition channel, and the inclined transition channel is repaired into a straight channel structure with an upper opening and a lower opening which are the same in size.
As a further improvement scheme of the invention, in the step a, the depth of the fault deformation region, the specific cutting height and the cutting azimuth angle of the end face and the hole wall to be cut off are determined, while the main supporting rod is inserted into the gas extraction well, the video probe feeds back the obtained image to the central control computer of the centralized electric control unit, the central control computer performs on-site acquisition of the depth of the fault deformation region according to the fed-back image data and performs computer modeling, a mathematical model of the fault deformation region of the gas extraction well is constructed, and the depth of the fault deformation region, the specific cutting height and the cutting azimuth angle of the end face and the hole wall to be cut off are determined; and in the step b, an operator controls the rotation angle of the main stay bar rotating device and the telescopic amount of the spray gun swing control component through the center on the ground according to the feedback of the video probe, and adjusts the spraying direction and the spraying angle of the water jet spray gun.
Compared with the prior art, the hydraulic cutting recovery system for the local gas extraction shearing failure drilling well carries out computer modeling through a central control computer of a centralized electric control unit according to image data fed back by video detection, constructs a mathematical model of a fault-breaking deformation region of the gas extraction drilling well, determines the depth of the fault-breaking deformation region and the specific cutting height and cutting azimuth angle of an end face and a hole wall to be cut, then puts a main support rod provided with a hydraulic cutting recovery device into the gas extraction drilling well, controls a main support rod rotating device to drive the main support rod to rotate after the hydraulic cutting recovery device is positioned at a set position in the fault-breaking deformation region, controls a spray gun swinging control component to drive a water jet spray gun to swing so that the spraying direction of the water jet spray gun is opposite to the position of the fault-breaking cross well hole, and controls an upper positioning part to enable the hydraulic cutting recovery device to be stably positioned, the end face and the hole wall which need to be cut can be cut hydraulically by starting the water jet high-pressure pump station, the arc-shaped cutting track of the water jet spray gun can be achieved by controlling the rotation of the spray gun rotation control component in the hydraulic cutting process, after the end face and the hole wall which need to be cut are completely cut, the broken well hole in the broken deformation area of the gas extraction well can be communicated with the broken deformation section through the inclined transition channel formed by the hydraulic cutting surface, the extraction capability of the ground gas extraction shear failure well which is broken in a deformed mode can be recovered, and the method is particularly suitable for repairing the well hole of the ground gas extraction well which has serious broken deformation.
Drawings
FIG. 1 is a schematic structural diagram of a surface gas extraction shear failure drilling hydraulic cutting recovery system;
FIG. 2 is a schematic structural diagram of a hydraulic cutting state of the hydraulic cutting repair device according to the present invention;
FIG. 3 is a schematic diagram of the hydraulic cutting status after lifting the hydraulic cutting repair device according to the present invention;
FIG. 4 is a schematic diagram of a trajectory of hydraulic cutting, wherein (a) is a graph of hydraulic cutting breakdown of the butt joint position of the faulted staggered well bore, (b) is a graph of the water jet lance's reaming of the pierced through-hole in the circumferential direction, (c) is a graph of the water jet lance's reaming of the pierced through-hole in the radial direction;
FIG. 5 is a top view of the upper positioning part of the hydraulic cutting repair device with positioning claws of a parallelogram hinge structure;
fig. 6 is a sectional view a-a of fig. 5.
In the figure: 1. a water storage tank; 2. a water jet high-pressure pump station; 3. a high-pressure water delivery pipe; 4. a main stay bar slewing device; 5. a main stay bar; 6. an upper positioning part; 61. positioning the clamping jaw; 7. a lower turning portion; 71. a spray gun rotation control part; 72. a revolving frame; 8. a water jet spray gun; 81. a lance oscillation control component.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the local surface gas extraction shear failure drilling hydraulic cutting recovery system comprises a well hole repairing part and a surface control part.
The well hole repairing part comprises a main supporting rod 5 and a hydraulic cutting repairing device coaxially and fixedly arranged at the bottom end of the main supporting rod 5;
the main stay bar 5 can be in a solid straight bar structure or a hollow straight tube structure;
the hydraulic cutting repair device comprises an upper positioning part 6, a lower rotating part 7 and a water jet spray gun 8; a plurality of positioning clamping jaws 61 which are arranged in a central symmetry manner are arranged on the machine body of the upper positioning part 6 along the circumferential direction of the machine body, the positioning clamping jaws 61 are arranged on the machine body of the upper positioning part 6 through clamping jaw synchronous radial telescopic mechanisms, clamping jaw synchronous radial telescopic driving parts are arranged on the clamping jaw synchronous radial telescopic mechanisms, and the plurality of positioning clamping jaws 61 can synchronously extend out or retract along the machine body radial direction of the upper positioning part 6 by controlling the actions of the clamping jaw synchronous radial telescopic driving parts; as shown in fig. 2 and 3, the lower rotating part 7 comprises a spray gun rotation control component 71 coaxially and fixedly mounted at the bottom end of the upper positioning part 6, the rotation center angle of the spray gun rotation control component 71 ranges from 0 to 180 degrees, the spray gun rotation control component 71 can be of a hydraulic motor structure or a hollow shaft speed reduction motor structure, a rotating frame 72 is fixedly arranged on a rotation output shaft of the spray gun rotation control component 71, and the rotating frame 72 can circumferentially rotate around the central axis of the spray gun rotation control component 71 by controlling the action of the spray gun rotation control component 71; the gun body of the water jet spray gun 8 with a tubular structure is hinged on the revolving frame 72, a spray gun swing control component 81 is further arranged between the gun body of the water jet spray gun 8 and the revolving frame 72, the spray gun swing control component 81 can be a hydraulic cylinder or an electric cylinder or other telescopic cylinders, and the water jet spray gun 8 can swing up and down around the hinged center of the water jet spray gun by controlling the telescopic action of the spray gun swing control component 81.
The ground control part comprises a water jet high-pressure pump station 2, a main stay bar slewing gear 4 and a centralized electric control unit; the main support rod rotating device 4 is positioned at a wellhead position of a gas extraction well, the main support rod 5 penetrates into the gas extraction well, the top of the main support rod 5 is connected with the main support rod rotating device 4 in an installing manner, the main support rod 5 or the main support rod rotating device 4 is also provided with a main support rod lifting control mechanism, and the main support rod lifting control mechanism can be a matched spiral lifting structure or other lifting structures such as a hydraulic cylinder lifting structure; the input end of the water jet high-pressure pump station 2 is communicated and connected with the water storage tank 1, and the output end of the water jet high-pressure pump station 2 is hermetically installed and connected with the input end of a water jet spray gun 8 through a high-pressure water delivery pipe 3 penetrating into the gas extraction well; the centralized electric control unit comprises a central control computer, a main support rod rotation control loop, a main support rod lifting control loop, a hydraulic cutting repair device control loop and a high-pressure water jet control loop, wherein the central control computer is electrically connected with the main support rod rotation device 4, the main support rod lifting control mechanism, the clamping jaw synchronous radial expansion driving part, the spray gun rotation control part 71 and the spray gun swing control part 81 respectively.
When the ground gas extraction shear failure drilling hydraulic cutting recovery system is used for repairing a fractured and deformed well bore of a gas extraction drilling well, computer modeling can be performed through a central control computer of a centralized electric control unit according to image data fed back by a video detection device of a fractured and deformed region of the gas extraction drilling well, a mathematical model of the fractured and deformed region of the gas extraction drilling well is constructed, and the depth of the fractured and deformed region, and the specific cutting height and the cutting azimuth angle of an end face and a hole wall to be cut are determined;
then, the lengths of the main support rod 5 and the high-pressure water delivery pipe 3 are determined according to the depth of the fault-fracture deformation area, a hydraulic cutting repair device is installed at the bottom end of the main support rod 5, the high-pressure water delivery pipe 3 and a water jet spray gun 8 are installed, the main support rod 5 is put into the gas extraction well, the hydraulic cutting repair device is located at a set position in the fault-fracture deformation area according to the specific cutting height of the end face and the hole wall to be cut off, and after the top of the main support rod 5 is located and installed through a main support rod rotation device 4, all water path pipelines and circuits are connected;
the central control computer controls the main support rod rotating device 4 to drive the main support rod 5 to rotate according to the specific cutting azimuth angle of the end face and the hole wall to be cut off, controls the spray gun swing control component 81 to drive the water jet spray gun 8 to swing so that the spraying direction of the water jet spray gun 8 is opposite to the position of the staggered and staggered well hole, and controls the action of the jack catch synchronous radial telescopic driving component to enable the plurality of positioning jack catches 61 to synchronously extend out along the radial direction of the machine body of the upper positioning part 6 and to be stably supported on the inner wall of the well hole; then the central control computer controls and starts the water jet high-pressure pump station 2, high-pressure water is sprayed out from the water jet spray gun 8 through the high-pressure water delivery pipe 3 to carry out hydraulic cutting on the end face and the hole wall which need to be cut off, as shown in figure 4, the arc-shaped cutting track of the water jet spray gun 8 can be realized by controlling the rotation of the spray gun rotation control component 71 in the hydraulic cutting process, as shown in figure 4(a), the butt joint position of the staggered cross well hole (namely the thinnest hole wall position of the staggered cross well hole) can be firstly cut and punctured, then as shown in figure 4(b), the water jet spray gun 8 can carry out reaming on the punctured through hole in the circumferential direction by controlling the spray gun rotation control component 71 to rotate back and forth within the central angle range of 0-180 degrees, after the reaming of the punctured through hole in the circumferential range is finished, the spray gun swing control component 81 is firstly used for driving the water jet spray gun, Repeatedly controlling the spray gun rotation control component 71 to rotate forward and backward in a reciprocating manner within the range of 0-180 degrees of central angle, as shown in fig. 4(c), the water jet spray gun 8 can expand the punched through hole in the radial direction until the end face and the hole wall which need to be cut are completely cut off, and the broken well hole of the gas extraction drilling broken deformation area is communicated with the broken deformation section through an inclined transition channel formed by a hydraulic cutting surface; after the repair is finished, the central control computer firstly controls the water jet high-pressure pump station 2 to be closed, then controls the jack catch synchronous radial telescopic driving part to act to enable the plurality of positioning jack catches 61 to be synchronously retracted and reset along the radial direction of the machine body of the upper positioning part 6, and finally recovers the main support rod 5 to go into the well through the main support rod lifting control mechanism.
As shown in figure 2, because the jet trajectory formed by the up-and-down swing of the water jet spray gun 8 is a conical structure (shown by a dotted line in figure 2), the inclined transition passage formed by the hydraulic cutting surface is also a conical structure with a small upper opening and a large lower opening, in order to realize sufficient throughput, after the hydraulic cutting of the inclined transition passage of the conical structure is completed, the water jet high-pressure pump station 2 is controlled to be closed, then the synchronous radial telescopic driving parts of the jaws are controlled to act to synchronously retract and reset a plurality of positioning jaws 61, the main supporting rod 5 is lifted upwards for a set distance through the main supporting rod lifting control mechanism, then as shown in figure 3, the synchronous radial telescopic driving parts of the jaws are controlled again to act to synchronously extend and position a plurality of positioning jaws 61, so that the hole wall above the inclined transition passage of the conical structure can be hydraulically cut again (shown by a dotted line in, the inclined transition channel with the conical structure can be repaired into a straight channel structure with the upper opening and the lower opening having the same size.
In order to facilitate real-time accurate detection and understanding of specific breaking conditions and repairing conditions of a well body fault-breaking deformation area of a gas extraction well, as a further improvement scheme of the invention, the hydraulic cutting and repairing device is further provided with a video probe, the centralized electric control unit further comprises a video detection control loop, the central control computer is electrically connected with the video probe, and a lead can go up the well along the main support rod 5. The main support rod 5 can be lowered into a gas extraction well, simultaneously, an image obtained by a video probe is directly fed back to a central control computer, the central control computer can directly obtain the depth of a faulted deformation area and computer modeling according to the fed-back image data, in addition, the size of the positioning clamping jaw 61 is reasonably set, and the expansion and contraction of the positioning clamping jaw 61 can be controlled according to the feedback of the video probe to realize the local extrusion repair of the hole passage with reduced diameter deformation in the process of lowering the main support rod 5 into the gas extraction well; in the hydraulic cutting repair process, an operator can directly control and adjust the spraying direction and the spraying angle of the water jet spray gun 8 on the ground through the feedback of the video probe.
As an embodiment of the upper positioning part 6 of the invention, the upper positioning part 6 can be a three-jaw chuck structure, the upper positioning part 6 of the three-jaw chuck structure comprises a rotating disk, the jaw synchronous radial telescopic mechanism comprises a disk surface spiral positioning groove arranged on the disk surface of the rotating disk and a jaw spiral positioning groove arranged on a positioning jaw 61, three positioning jaws 61 symmetrically arranged relative to the center of the rotating disk are matched and clamped on the disk surface of the rotating disk through the jaw spiral positioning grooves, the jaw synchronous radial telescopic driving part is a driving part capable of driving the rotating disk to rotate, the jaw synchronous radial telescopic driving part can be a driving motor or other driving parts capable of driving the rotating disk to rotate, such as a hydraulic motor and the like, the three positioning claws 61 can synchronously extend out or retract along the radial direction of the machine body of the upper positioning part 6 by driving the rotating disc to rotate forwards and backwards.
As another embodiment of the upper positioning portion 6 of the present invention, as shown in fig. 5 and 6, the positioning jaw 61 may be a parallelogram hinge structure, the positioning jaw 61 includes a vertically arranged jaw body and two parallel hinged connecting rods, one end of each of the two hinged connecting rods arranged separately from each other is hinged to the jaw body, the other end is hinged to the body of the upper positioning portion 6, the jaw body, the hinged connecting rods and the body of the upper positioning portion 6 together form a parallelogram hinge structure, the jaw synchronous radial expansion mechanism is a link mechanism capable of synchronously controlling the swing of the hinged connecting rods of the plurality of positioning jaws 61, the jaw synchronous radial expansion driving component is an expansion cylinder such as a hydraulic cylinder or an electric cylinder capable of driving the swing of the hinged connecting rods of the positioning jaws 61, the cylinder body end of the expansion cylinder is fixedly arranged on the upper positioning portion 6, and the expansion end is hinged to the hinged connecting rods of the plurality of positioning jaws 61 through the link mechanism, synchronous swinging of the plurality of positioning claws 61 hinged connecting rods can be realized by controlling the stretching of the telescopic cylinder. The mode that every location jack catch 61 all sets up the telescoping cylinder alone also can be adopted, and the telescoping cylinder can be directly articulated the setting in parallelogram hinge structure's diagonal position in both ends, realizes the synchronous swing of a plurality of location jack catches 61 articulated connecting rod through the synchronous flexible realization of controlling a plurality of telescoping cylinders, so set up can realize setting up the whole through-hole that runs through location portion 6, the cross-under pipeline of being convenient for of location portion 6's organism axle center position.
In order to achieve a more stable positioning effect, as a further improvement of the present invention, as shown in fig. 6, when the hinged connecting rod swings upward, the body of the upward positioning portion 6 of the jaw body retracts closely, and when the hinged connecting rod swings downward, the body of the upward positioning portion 6 of the jaw body extends out, that is, an included angle between the body of the upper positioning portion 6 and the lower hinged connecting rod is an acute angle structure. With the arrangement, when the positioning claw 61 extends out and is supported on the inner wall of the well hole, the whole hydraulic cutting repair device tends to move upwards due to the recoil of hydraulic cutting, so that in the hydraulic cutting process, the body of the upper positioning part 6 can generate downward swinging moment on the hinged connecting rod, the moment can act on the claw body to apply pressure to the inner wall of the well hole, the bigger the recoil of hydraulic cutting is, the bigger the pressure applied to the inner wall of the well hole by the claw body is, and further the stable positioning of the hydraulic cutting repair device in the hydraulic cutting process is realized.
As an implementation mode of the control mode of the hydraulic cutting repair device, the hydraulic control is adopted, namely, a jaw synchronous radial telescopic driving part is a driving hydraulic motor or a driving hydraulic cylinder, a spray gun rotary control part 71 is a rotary control hydraulic motor, a spray gun swing control part 81 is a swing control hydraulic cylinder, the jaw synchronous radial telescopic driving part, the spray gun rotary control part 71 and the spray gun swing control part 81 are connected with a hydraulic pump station through a hydraulic pipeline and a hydraulic control valve bank, and a central control computer of a centralized electric control unit is respectively and electrically connected with the hydraulic control valve bank and the hydraulic pump station. Furthermore, a hydraulic control valve group and a hydraulic pump station can be integrally installed at the top of the upper positioning part 6.
As another embodiment of the control mode of the hydraulic cutting repair device, the full-electric control is adopted, that is, the jaw synchronous radial telescopic driving component is a driving motor or a driving electric cylinder, the spray gun rotation control component 71 is a rotation control motor, and the spray gun swing control component 81 is a swing control electric cylinder.
In order to reduce the mechanism arrangement and avoid the winding problem of the high-pressure water conveying pipe 3 caused by the rotation of the rotary frame 72, as a further improved scheme of the invention, the main stay bar 5 is of a hollow straight pipe structure; a through hole which integrally penetrates through the upper positioning part 6 is arranged at the axle center position of the machine body of the upper positioning part 6 (the upper positioning part 6 can adopt the three-jaw chuck structure), the spray gun rotation control part 71 is a hollow shaft speed reducing motor, namely, the axle center positions of the upper positioning part 6 and the lower rotation part 7 form a high-pressure water delivery pipe channel which can allow the high-pressure water delivery pipe 3 to pass through; the high-pressure water pipe 3 penetrates through the main support rod 5 and the high-pressure water pipe channel and then is hermetically installed and connected with the input end of the water jet spray gun 8. Further, in order to avoid the twisting problem of the high-pressure water pipe 3, the main support rod 5 of the hollow straight pipe structure can be directly utilized to convey high-pressure water, that is, the output end of the water jet high-pressure pump station 2 is connected with the inner cavity of the main support rod 5 in a sealing installation mode through the high-pressure water pipe, the bottom end of the main support rod 5 is connected with the high-pressure water pipe 3 in the high-pressure water pipe channel in a sealing rolling installation mode through an end face sealing structure, and the bottom end of the high-pressure water pipe 3 is connected with the input end of the water jet.
Aiming at a ground gas extraction well with a plurality of fractured and deformed areas, after the first fractured and deformed area close to the ground is repaired, in order to facilitate the hydraulic cutting repair device to smoothly enter the second fault-breaking deformation region through the inclined transition channel, as a further improvement of the invention, the main supporting rod 5 is a structure comprising an upper hard tube part and a lower hose part, the upper hard tube part of the main supporting rod 5 is connected with the main supporting rod rotating device 4 in an installing way, the main supporting rod lifting control mechanism is arranged on the upper hard tube part of the main supporting rod 5 or the main supporting rod rotating device 4, the hydraulic cutting repair device is arranged at the bottom end of the lower hose part of the main supporting rod 5, the inclined transition channel with a proper angle is cut through the hydraulic cutting repair device, it is achieved that the lower hose portion of the main strut 5 together with the hydraulic cutting repair device can be passed through the oblique transition channel into the second fault deformation zone.
In order to further increase the injection pressure, the water jet lance 8 is in the form of a conical tube with a large top and a small bottom as a further development of the invention.
The main support rod 5, the main support rod rotation device 4 and the main support rod lifting control mechanism of the ground gas extraction shearing failure drilling hydraulic cutting recovery system can directly adopt a high-pressure conveying pipe, a high-pressure conveying pipe rotation device and a high-pressure conveying pipe lifting control mechanism of a coal mine hydraulic mining device, namely, the hydraulic cutting recovery device of the ground gas extraction shearing failure drilling hydraulic cutting recovery system can be directly installed at the bottom end of the high-pressure conveying pipe of the coal mine hydraulic mining device, and the rotation device and the lifting control mechanism do not need to be additionally designed so as to reduce the recovery cost; by adopting the hydraulic cutting recovery system for the ground gas extraction shear failure drilling well, the communication of the fault-breaking deformation section of the fault-breaking well bore in the fault-breaking deformation area of the gas extraction drilling well can be realized through the inclined transition channel formed by the hydraulic cutting surface, the recovery of the extraction capacity of the deformed and broken gas extraction drilling well can be realized, and the system is particularly suitable for repairing the well bore of the gas extraction drilling well with serious fault-breaking deformation.
Claims (10)
1. A surface gas extraction shear failure drilling hydraulic cutting recovery system is characterized by comprising a well hole recovery part and a surface control part;
the well hole repairing part comprises a main supporting rod (5) and a hydraulic cutting repairing device which is coaxially and fixedly arranged at the bottom end of the main supporting rod (5);
the hydraulic cutting repair device comprises an upper positioning part (6), a lower rotating part (7) and a water jet spray gun (8); a plurality of positioning clamping jaws (61) which are arranged in a central symmetry manner are arranged on the machine body of the upper positioning part (6) along the circumferential direction of the machine body, the positioning clamping jaws (61) are arranged on the machine body of the upper positioning part (6) through clamping jaw synchronous radial telescopic mechanisms, clamping jaw synchronous radial telescopic driving parts are arranged on the clamping jaw synchronous radial telescopic mechanisms, and the plurality of positioning clamping jaws (61) can synchronously extend out or retract along the machine body radial direction of the upper positioning part (6) by controlling the actions of the clamping jaw synchronous radial telescopic driving parts; the lower rotating part (7) comprises a spray gun rotating control component (71) coaxially and fixedly mounted at the bottom end of the upper positioning part (6), a rotating frame (72) is fixedly arranged on a rotating output shaft of the spray gun rotating control component (71), and the rotating frame (72) can circumferentially rotate around the central axis of the spray gun rotating control component (71) by controlling the action of the spray gun rotating control component (71); the gun body of the water jet spray gun (8) with a tubular structure is hinged on the rotary frame (72), a spray gun swing control component (81) is further arranged between the gun body of the water jet spray gun (8) and the rotary frame (72), the spray gun swing control component (8) is of a telescopic cylinder structure, and the water jet spray gun (8) can swing up and down around the hinged center of the water jet spray gun by controlling the telescopic action of the spray gun swing control component (81);
the ground control part comprises a water jet high-pressure pump station (2), a main stay bar slewing gear (4) and a centralized electric control unit; the main support rod rotating device (4) is positioned at a wellhead position of a gas extraction well, the main support rod (5) penetrates into the gas extraction well, the top of the main support rod (5) is connected with the main support rod rotating device (4) in an installing manner, and a main support rod lifting control mechanism is further arranged on the main support rod (5) or the main support rod rotating device (4); the input end of the water jet high-pressure pump station (2) is communicated and connected with the water storage tank (1), and the output end of the water jet high-pressure pump station (2) is hermetically installed and connected with the input end of a water jet spray gun (8) through a high-pressure water delivery pipe (3) penetrating into the gas extraction well; the centralized electric control unit comprises a central control computer, a main support rod rotation control loop, a main support rod lifting control loop, a hydraulic cutting repair device control loop and a high-pressure water jet control loop, wherein the central control computer is electrically connected with the main support rod rotation device (4), the main support rod lifting control mechanism, the clamping jaw synchronous radial expansion driving component, the spray gun rotation control component (71) and the spray gun swing control component (81) respectively.
2. The ground gas extraction shear failure drilling hydraulic cutting recovery system according to claim 1, wherein a video probe is further arranged on the hydraulic cutting recovery device, the centralized electric control unit further comprises a video detection control loop, and the central control computer is electrically connected with the video probe.
3. The ground gas extraction shear failure drilling hydraulic cutting recovery system according to claim 1 or 2, wherein the upper positioning portion (6) is a three-jaw chuck structure, the upper positioning portion (6) of the three-jaw chuck structure comprises a rotating disk, the jaw synchronous radial telescopic mechanism comprises a disk surface spiral positioning groove formed in the disk surface of the rotating disk and jaw spiral positioning grooves formed in positioning jaws (61), the three positioning jaws (61) symmetrically arranged relative to the center of the rotating disk are installed on the disk surface of the rotating disk in a matched clamping mode through the jaw spiral positioning grooves, and the jaw synchronous radial telescopic driving part is a rotary driving part capable of driving the rotating disk to rotate.
4. The ground gas extraction shear failure drilling hydraulic cutting recovery system according to claim 1 or 2, wherein the positioning jaw (61) is of a parallelogram structure, the positioning jaw (61) comprises a vertically arranged jaw body and two parallel hinged connecting rods, one end of each of the two hinged connecting rods which are vertically arranged is hinged to the jaw body, the other end of each of the two hinged connecting rods is hinged to the body of the upper positioning portion (6), the bodies of the jaw body, the hinged connecting rods and the upper positioning portion (6) enclose the parallelogram hinge structure together, when the hinged connecting rods swing upwards, the bodies of the jaw bodies close to the upper positioning portion (6) retract, and when the hinged connecting rods swing downwards, the bodies of the jaw bodies far away from the upper positioning portion (6) extend; the jaw synchronous radial telescopic mechanism is a link mechanism capable of synchronously controlling the swing of hinged connecting rods of a plurality of positioning jaws (61), the jaw synchronous radial telescopic driving part is a telescopic cylinder capable of driving the hinged connecting rods of the positioning jaws (61) to swing, the cylinder body end of the telescopic cylinder is fixedly arranged on the upper positioning part (6), and the telescopic end is respectively hinged with the hinged connecting rods of the plurality of positioning jaws (61) through the link mechanism.
5. The ground gas extraction shear failure drilling hydraulic cutting recovery system according to claim 1 or 2, wherein the main supporting rod (5) is of a hollow straight pipe structure; a through hole which integrally penetrates through the upper positioning part (6) is formed in the axis position of the machine body of the upper positioning part (6), the spray gun rotation control component (71) is a hollow shaft speed reducing motor, and a high-pressure water delivery pipe channel which can allow the high-pressure water delivery pipe (3) to pass through is formed in the axis positions of the upper positioning part (6) and the lower rotation part (7); the high-pressure water delivery pipe (3) penetrates through the main stay bar (5) and the high-pressure water delivery pipe channel and then is hermetically installed and connected with the input end of the water jet spray gun (8).
6. The ground gas extraction shear failure drilling hydraulic cutting recovery system according to claim 1 or 2, wherein the main supporting rod (5) is of a hollow straight pipe structure; a through hole which integrally penetrates through the upper positioning part (6) is formed in the axis position of the machine body of the upper positioning part (6), the spray gun rotation control component (71) is a hollow shaft speed reducing motor, and a high-pressure water delivery pipe channel which can allow the high-pressure water delivery pipe (3) to pass through is formed in the axis positions of the upper positioning part (6) and the lower rotation part (7); the output end of the water jet high-pressure pump station (2) is connected with the inner cavity of the main support rod (5) in a sealing installation mode through a high-pressure water pipe, the bottom end of the main support rod (5) is connected with the high-pressure water pipe (3) in the high-pressure water pipe channel in a sealing rolling installation mode, and the bottom end of the high-pressure water pipe (3) is connected with the input end of the water jet spray gun (8) in a sealing installation mode.
7. A hydraulic cutting recovery method for a ground gas extraction shear failure drilling well is characterized by comprising the following steps:
a. preparation of repair: firstly, determining the depth of a fault-breaking deformation region, and the specific cutting height and cutting azimuth angle of an end face and a hole wall to be cut off, mounting a hydraulic cutting repair device at the bottom end of a main support rod (5), mounting a high-pressure water delivery pipe (3) and a water jet spray gun (8), then lowering the main support rod (5) into a gas extraction well, enabling the hydraulic cutting repair device to be located at a set position in the fault-breaking deformation region according to the specific cutting height of the end face and the hole wall to be cut off, positioning and mounting the top of the main support rod (5) through a main support rod rotating device (4), and then connecting each water channel pipeline and a circuit;
b. hydraulic cutting and repairing: the central control computer controls the main support rod rotating device (4) to drive the main support rod (5) to rotate according to a specific cutting azimuth angle of an end face and a hole wall to be cut off, controls the spray gun swing control component (81) to drive the water jet spray gun (8) to swing so that the spraying direction of the water jet spray gun (8) is opposite to the position of the staggered well hole, and controls the synchronous radial telescopic driving component of the clamping jaws to move so that the plurality of positioning clamping jaws (61) synchronously extend out along the radial direction of the machine body of the upper positioning part (6) and are stably supported on the inner wall of the well hole; then the central control computer controls and starts the water jet high-pressure pump station (2), controls high-pressure water to be sprayed out from the water jet spray gun (8) through the high-pressure water pipe (3) to perform hydraulic cutting on the end surface and the hole wall to be cut, and realizes the arc-shaped cutting track of the water jet spray gun (8) by controlling the rotation of the spray gun rotation control component (71) in the hydraulic cutting process;
c. equipment recovery: after the end face and the hole wall which need to be cut are cut, the broken hole of the broken deformation area of the gas extraction drilling well is communicated with the broken deformation section through an inclined transition channel formed by a hydraulic cutting surface, the central control computer firstly controls to close the water jet high-pressure pump station (2) and then controls the synchronous radial telescopic driving part of the clamping jaws to move so that the plurality of positioning clamping jaws (61) are synchronously retracted and reset along the radial direction of the machine body of the upper positioning part (6), and finally the upper well of the main supporting rod (5) is recovered through the main supporting rod lifting control mechanism.
8. The ground gas extraction shear failure drilling hydraulic cutting recovery method according to claim 7, characterized in that when the end face and the hole wall to be cut are subjected to hydraulic cutting in step b, firstly, the butt joint position of the staggered well hole is subjected to hydraulic cutting breakdown, and then, the water jet spray gun (8) is subjected to reaming in the circumferential direction of the broken through hole by controlling the spray gun rotation control component (71) to rotate in a forward and reverse reciprocating manner within the range of 0-180 degrees of central angle; after the through hole which is punctured is reamed in the circumferential range, the spray gun swing control component (81) is controlled to drive the water jet spray gun (8) to swing upwards or downwards to a set angle and to be positioned, and then the spray gun rotation control component (71) is controlled repeatedly to rotate forwards and backwards in a range of 0-180 degrees of central angle, so that the water jet spray gun (8) reams the punctured through hole in the radial direction until the end face and the hole wall which need to be cut off are cut off completely.
9. The ground gas extraction shear failure drilling hydraulic cutting recovery method according to claim 7 or 8, characterized in that in the step b, after hydraulic cutting of the inclined transition channel is completed, the water jet high-pressure pump station (2) is controlled to be closed, then the synchronous radial telescopic driving parts of the jaws are controlled to act to enable the plurality of positioning jaws (61) to be synchronously retracted and reset, the main supporting rod (5) is lifted upwards for a set distance through the main supporting rod lifting control mechanism, then the synchronous radial telescopic driving parts of the jaws are controlled again to act to enable the plurality of positioning jaws (61) to be synchronously extended and positioned, then hydraulic cutting is performed again on the hole wall above the inclined transition channel, and the inclined transition channel is repaired into a straight channel structure with an upper opening and a lower opening of the same size.
10. The ground gas extraction shear failure drilling hydraulic cutting recovery method according to claim 7 or 8, wherein a video probe is further arranged on the hydraulic cutting repair device, the centralized electric control unit further comprises a video detection control loop, and the central control computer is electrically connected with the video probe;
the method for determining the depth of the fault-breaking deformation region and the specific cutting height and cutting azimuth angle of the end face and the hole wall to be cut off in the step a is characterized in that while a main supporting rod (5) is lowered into a gas extraction well, a video probe feeds back an obtained image to a central control computer of a centralized electric control unit (3), the central control computer performs on-site acquisition of the depth of the fault-breaking deformation region according to fed-back image data and performs computer modeling, a mathematical model of the fault-breaking deformation region of the gas extraction well is constructed, and the depth of the fault-breaking deformation region and the specific cutting height and cutting azimuth angle of the end face and the hole wall to be cut off are determined;
and in the step b, an operator controls the rotation angle of the main support rod rotation device (4) and the expansion and contraction amount of the spray gun swing control component (81) through a central control mode on the ground according to the feedback of the video probe, and adjusts the spraying direction and the spraying angle of the water jet spray gun (8).
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