CN112780208B - Gas extraction drilling fault-breaking deformation area repairing system and repairing method - Google Patents
Gas extraction drilling fault-breaking deformation area repairing system and repairing method Download PDFInfo
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- CN112780208B CN112780208B CN202110012861.1A CN202110012861A CN112780208B CN 112780208 B CN112780208 B CN 112780208B CN 202110012861 A CN202110012861 A CN 202110012861A CN 112780208 B CN112780208 B CN 112780208B
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- 238000000605 extraction Methods 0.000 title claims abstract description 89
- 238000005553 drilling Methods 0.000 title claims abstract description 42
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 81
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- 238000002347 injection Methods 0.000 claims description 36
- 239000000523 sample Substances 0.000 claims description 28
- 230000008439 repair process Effects 0.000 claims description 24
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
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Abstract
The invention discloses a gas extraction drilling fault-breaking deformation area repairing system and a repairing method, wherein the gas extraction drilling fault-breaking deformation area repairing system comprises a well hole repairing part and a ground control part; the well hole repairing part comprises a high-pressure conveying pipe, a positioning bag and a hydraulic cutting repairing device, wherein the hydraulic cutting repairing device is arranged at the bottom end of the high-pressure conveying pipe and comprises a housing and a spherical nozzle arranged in the housing, and the spherical nozzle can swing around the spherical center of the spherical nozzle along a horizontal axis and rotate along a vertical axis. The invention carries out hydraulic cutting on the end face to be cut and the well wall of the fractured and deformed area of the gas extraction well, the arc-shaped cutting track of the nozzle can be realized by controlling the spherical sprayer to rotate and drive the motor in the hydraulic cutting process, after the end face to be cut and the well wall are cut, the fractured well bore of the fractured and deformed area of the gas extraction well is communicated through the inclined transition channel formed by the hydraulic cutting surface, and the extraction capability of the gas extraction well can be recovered.
Description
Technical Field
The invention relates to a well drilling repairing system and a repairing method, in particular to a repairing system and a repairing method suitable for repairing a gas extraction well drilling fault-broken deformation area, 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 conducting negative pressure extraction through ground drilling basically comprises the steps of drilling a hole from the ground and vertically drilling a hole downwards to construct a well body, stopping drilling at a position 10-30 m above a coal seam, enabling the depth of the well body to be over 300m generally, then arranging a sleeve in the well body of the drilling well to reinforce the well body and enabling the sleeve to serve as a unique gas circulation channel for gas to flow to the ground from the underground, generally speaking, in order to reduce construction difficulty, drilling construction is completed before stoping of a coal face, the method for conducting negative pressure extraction through ground drilling has the advantages of being large in extracted gas flow, high in concentration, good in effect of controlling gas emission in an underground goaf, free of influences of underground production development layout, and widely applied to various coal mines.
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 system and a method for repairing a fractured and deformed region of a gas extraction well, which can repair the fractured and deformed region of a well body of the deformed gas extraction well, so that the fractured and deformed gas extraction well recovers extraction capacity, and is particularly suitable for repairing a well hole of the gas extraction well.
In order to achieve the purpose, the gas extraction drilling fracture deformation area repairing system comprises a well hole repairing part and a ground control part;
the well hole repairing part comprises a high-pressure conveying pipe, a positioning bag and a hydraulic cutting repairing device;
the positioning bag of the annular closed bag structure is sleeved and fixedly arranged on the pipe body of the high-pressure conveying pipe, and the bottom end of the positioning bag is provided with an electric control drain valve;
the hydraulic cutting repair device is arranged at the bottom end of the high-pressure conveying pipe and comprises a housing and a spherical nozzle, the housing is fixedly arranged at the bottom end of the high-pressure conveying pipe, an arc clamping structure matched with the spherical surface of the spherical nozzle is fixedly arranged inside the housing, a circular through hole coaxially arranged with the high-pressure conveying pipe is arranged at the bottom end of the housing, the top and the bottom of the spherical nozzle are respectively clamped and arranged inside the housing through the arc clamping structure and the circular through hole of the housing, the spherical center of the spherical nozzle is positioned on the axis of the high-pressure conveying pipe, a nozzle with a spraying direction arranged along the radial direction of the spherical nozzle is arranged in the bottom area of the spherical nozzle protruding out of the circular through hole of the housing, a nozzle inner cavity penetrating into the spherical nozzle and communicated with the nozzle is arranged at the center of the top of the spherical nozzle, and the top end of the nozzle inner cavity is communicated and connected with the high-pressure conveying pipe through a high-pressure hose; the outer surface of the upper hemisphere of the spherical nozzle is provided with a meshing tooth structure I which is convexly arranged along the radial direction of the spherical nozzle, meshing teeth of the meshing tooth structure I are uniformly arranged at intervals from top to bottom according to a module along the outer surface of the upper hemisphere of the spherical nozzle, each meshing tooth is in a closed circular ring shape around the axial lead of the upper hemisphere, a spherical nozzle swing control gear which is in meshing connection with the meshing tooth structure I is arranged in the housing in a rolling fit mode corresponding to the position of the meshing tooth structure I, and the spherical nozzle swing control gear is in transmission connection with a spherical nozzle swing driving motor arranged on the housing through a transmission mechanism; the outer surface of the lower hemisphere of the spherical nozzle is provided with a meshing tooth structure II which is convexly arranged along the radial direction of the lower hemisphere, meshing teeth of the meshing tooth structure II are uniformly arranged at intervals according to modules along the horizontal circumferential direction of the outer surface of the lower hemisphere of the spherical nozzle, the meshing tooth structure II is integrally in an annular rack structure which is in butt joint end to end, the tooth crest of each meshing tooth is an arc-shaped tooth surface structure which is consistent with the radian of the outer surface of the lower hemisphere, a spherical nozzle rotation control gear which is in meshing connection with the meshing tooth structure II is arranged in the housing in a rolling fit mode corresponding to the position of the meshing tooth structure II, and the spherical nozzle rotation control gear is in transmission connection with a spherical nozzle rotation driving motor arranged on the housing through a transmission mechanism;
the ground control part comprises a well cover, a water jet high-pressure pump station, a water injection pump station and a centralized electric control unit; the top of the high-pressure transportation pipe is erected and installed at the position of a well mouth of the gas extraction well through a well cover, and the top end of the high-pressure transportation pipe is hermetically installed and connected with the output end of the water jet high-pressure pump station through a high-pressure input pipe and a high-pressure input electric control valve; the top of the positioning bag is hermetically installed and connected with the output end of the water injection pump station through a water delivery hose and a water injection electric control valve; the centralized electric control unit comprises a central control computer, a high-pressure water jet control loop, a bag water injection and drainage control loop and a hydraulic cutting repair device control loop, wherein the central control computer is respectively electrically connected with a high-pressure input electric control valve of a high-pressure conveying pipe, a water injection electric control valve of a water conveying hose, an electric control drainage valve of a positioning bag, a spherical nozzle swing driving motor and a spherical nozzle rotation driving motor.
As a further improvement scheme of the invention, the top of the spherical nozzle is also provided with a plane slewing bearing which can enable the spherical nozzle to freely rotate along a vertical axis passing through the center of the sphere, the top end of the inner cavity of the nozzle is communicated and connected with a high-pressure hose through a hard pipe end which is connected with the plane slewing bearing in an installing way, the top end of the inner cavity of the nozzle is connected with the hard pipe end in a sealing way, and when the spherical nozzle is driven by a spherical nozzle slewing driving motor through a spherical nozzle slewing control gear to drive the spherical nozzle to rotate along the vertical axis passing through the center of the sphere, the top end of the inner cavity of the nozzle rotates relative to the hard pipe end; the top of the spherical sprayer is also fixedly provided with a swing guide shaft erected on the arc-shaped clamping structure in a matching mode, when the spherical sprayer swing driving motor drives the whole spherical sprayer to swing along a transverse axis passing through the center of a sphere through the spherical sprayer swing control gear, the swing guide shaft follows the swing of the spherical sprayer along the trend of the arc-shaped clamping structure, and when the spherical sprayer rotation driving motor drives the whole spherical sprayer to rotate along a vertical axis passing through the center of a sphere through the spherical sprayer rotation control gear, the swing guide shaft does not follow the rotation of the spherical sprayer.
As a further improvement scheme of the hydraulic cutting repair device, the hydraulic cutting repair device is further provided with a video probe, the video probe is installed on the housing through a probe connecting frame, the centralized electric control unit further comprises a video detection control loop, and the central control computer is electrically connected with the video probe.
As a further improvement scheme of the invention, the bottom of the housing is provided with an annular guide rail which is circular as a whole in the circumferential direction, the probe connecting frame is arranged on the annular guide rail through a guide wheel which is matched with the annular guide rail, the guide wheel is provided with a guide wheel driving motor, and a central control computer of the centralized electric control unit is electrically connected with the guide wheel driving motor.
As a further improvement scheme of the invention, the cover shell is a cylindrical body with a spherical structure at the bottom end, or the whole cover shell is of a spherical structure.
As a further improvement scheme of the invention, the spherical nozzle swing driving motor and the spherical nozzle rotary driving motor are both vertically installed in the housing, a power output shaft vertically arranged by the spherical nozzle rotary driving motor is in meshing transmission connection with the meshing tooth structure II through a horizontally arranged spherical nozzle rotary control gear, a power output shaft vertically arranged by the spherical nozzle swing driving motor is in meshing transmission connection with a vertically arranged swing driving bevel gear disc II through a horizontally arranged swing driving bevel gear disc I, and the swing driving bevel gear disc II is coaxially and fixedly connected with the spherical nozzle swing control gear.
As a further development of the invention, the high-pressure delivery pipe is a structure comprising a hose portion and a hard pipe portion, the hard pipe portion being located at the bottom end of the high-pressure delivery pipe, and the positioning bladder being mounted on the hard pipe portion of the high-pressure delivery pipe.
A method for repairing a fractured and deformed area of a gas extraction well comprises the following steps:
a. preparation of repair: firstly, determining the depth of a fault-breaking deformation area, the specific cutting height and the cutting azimuth angle of an end face to be cut and a well wall, installing a positioning bag on a pipe body of a high-pressure conveying pipe, installing a hydraulic cutting repair device at the bottom end of the high-pressure conveying pipe, then putting the high-pressure conveying pipe into a gas extraction well, enabling the hydraulic cutting repair device to be located at a set position in the fault-breaking deformation area according to the specific cutting height of the end face to be cut and the well wall, positioning the top of the high-pressure conveying pipe through a well cover, and then connecting each water path pipeline and a circuit;
b. hydraulic cutting and repairing: starting a water injection pump station, controlling a water injection electric control valve for opening a water delivery hose and an electric control drain valve for closing a positioning bag by a central control computer, controlling the water injection pump station to inject pressure water into the positioning bag to enable the positioning bag to be supported and then positioning a high-pressure delivery pipe, controlling a spherical nozzle swing driving motor and/or a spherical nozzle rotary driving motor to act according to a cutting azimuth angle of an end face to be cut and a well wall to enable a spherical nozzle to integrally swing along a horizontal axis and/or rotate along a vertical axis around a spherical center of the spherical nozzle, starting a water jet high-pressure pump station after a spraying direction of a nozzle at the bottom of the spherical nozzle corresponds to the end face to be cut and the well wall, controlling high-pressure water to be sprayed out from the nozzle through the high-pressure delivery pipe, the high-pressure hose and a nozzle inner cavity to hydraulically cut the end face to be cut and the well wall, the arc-shaped cutting track of the nozzle is realized by controlling a spherical nozzle to rotate and drive a motor in the hydraulic cutting process;
c. equipment recovery: after the end face and the well wall to be cut off are cut off, the water injection pump station and the water jet high-pressure pump station are closed, the central control computer controls the water injection electric control valve for closing the water delivery hose, the high-pressure input electric control valve for the high-pressure delivery pipe and the electric control drain valve for opening the positioning bag, and after water in the bag to be positioned is discharged, the water is recovered and conveyed to the well through the high-pressure delivery pipe.
As a further improvement scheme of the invention, in the step a, the mode of determining the depth of the fault-breaking deformation region, the specific cutting height and the cutting azimuth angle of the end face to be cut and the well wall is to insert a gas extraction drilling fault-breaking deformation region video detection device into the gas extraction drilling well, perform computer modeling through a central control computer of a centralized electric control unit according to image data fed back by the gas extraction drilling fault-breaking deformation region video detection device, construct a gas extraction drilling fault-breaking deformation region mathematical model, and determine the depth of the fault-breaking deformation region, the specific cutting height and the cutting azimuth angle of the end face to be cut and the well wall.
As a further improvement scheme of the invention, the mode of determining the depth of the fault-breaking deformation region, the specific cutting height and the cutting azimuth angle of the end face and the well wall to be cut off in the step a is that when a high-pressure conveying pipe is put into a gas extraction well, an image obtained by a video probe is fed back to a central control computer, and the central control computer carries out on-site acquisition of the depth of the fault-breaking deformation region and computer modeling according to the fed back image data;
in the step b, an operator controls the spherical sprayer swinging driving motor and/or the spherical sprayer rotating driving motor to act and adjust the spraying angle of the nozzle through the central control computer on the ground according to the feedback of the video probe.
Compared with the prior art, the gas extraction drilling well fault-breaking deformation area repairing system 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 gas extraction drilling well fault-breaking deformation area mathematical model, after determining the depth of a fault-breaking deformation area, the specific cutting height and the cutting azimuth angle of an end face and a well wall to be cut off, a high-pressure conveying pipe provided with a positioning bag and a hydraulic cutting repairing device is put into the gas extraction drilling well, after the hydraulic cutting repairing device is positioned at the set position in the fault-breaking deformation area, the positioning bag is supported by injecting pressure water into the positioning bag to position the high-pressure conveying pipe, and meanwhile, the central control computer controls a spherical sprayer swinging driving motor and/or a spherical sprayer rotating driving motor to act according to the cutting azimuth angle of the end face and the well wall to be cut off, so that the spherical sprayer swings along the spherical center of the whole body and/or the spraying angle of the rotating adjusting nozzle is/or is/is And then starting a water jet high-pressure pump station to perform hydraulic cutting on the end face to be cut and the well wall, wherein the arc-shaped cutting track of a nozzle can be realized by controlling a spherical nozzle to rotate and drive a motor in the hydraulic cutting process, and after the end face to be cut and the well wall are cut, the broken well bore of the broken deformation area of the gas extraction well bore realizes the communication of the broken deformation section through an inclined transition channel formed by a hydraulic cutting surface, so that the extraction capability of the deformed and broken gas extraction well bore can be recovered, and the method is particularly suitable for repairing the gas extraction well bore.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged partial view of FIG. 1;
FIG. 3 is a schematic view of the housing structure of the hydraulic cutting repair device of the present invention;
FIG. 4 is a schematic view of the mounting structure of the video probe of the present invention;
FIG. 5 is a schematic sectional view of a ball-type sprinkler of the present invention installed in an enclosure;
fig. 6 is a schematic view of an installation structure of a ball type sprinkler head swing control gear according to the present invention.
In the figure: 1. a water jet high-pressure pump station; 2. a high pressure input pipe; 3. a centralized electric control unit; 4. a water injection pump station; 5. a water delivery hose; 6. a well cover; 7. a high pressure transport pipe; 8. positioning the capsular bag; 9. a high pressure hose; 10. a housing; 11. a spherical nozzle rotation driving motor; 12. a spherical nozzle swing driving motor; 13. a spherical nozzle rotation control gear; 14. a bevel gear plate I is driven to swing; 15. a bevel gear plate II is driven to swing; 16. a spherical nozzle swing control gear; 17. a spherical nozzle; 18. a swing guide shaft; 19. a planar slew bearing; 20. a volute spiral spring device; 21. a fixing buckle; 22. a guide wheel driving motor; 23. a video probe; 24. an annular guide rail; 25. an inner cavity of the spray head; 26. a probe connecting frame; 27. arc joint structure.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the system for repairing the fractured and deformed area of the gas extraction well comprises a well hole repairing part and a ground control part.
The well hole repairing part comprises a high-pressure conveying pipe 7, a positioning bag 8 and a hydraulic cutting repairing device;
a positioning bag 8 of an annular closed bag structure is sleeved and fixedly arranged on the pipe body of the high-pressure conveying pipe 7, and the bottom end of the positioning bag 8 is provided with an electric control drain valve;
as shown in fig. 2, the hydraulic cutting repair device is arranged at the bottom end of the high-pressure transportation pipe 7, and comprises a housing 10 and a spherical nozzle 17, the housing 10 is fixedly arranged at the bottom end of the high-pressure transportation pipe 7, as shown in fig. 3, an arc-shaped clamping structure 27 matched with the spherical surface of the spherical nozzle 17 is fixedly arranged inside the housing 10, the arc-shaped clamping structure 27 can be an arc-shaped clamping plate structure or an arc-shaped clamping groove structure, the bottom end of the housing 10 is provided with a circular through hole coaxially arranged with the high-pressure transportation pipe 7, as shown in fig. 2, the top and the bottom of the spherical nozzle 17 are respectively clamped and arranged inside the housing 10 through the arc-shaped clamping structure 27 and the circular through hole of the housing 10, the spherical center of the spherical nozzle 17 is positioned on the axial center of the high-pressure transportation pipe 7, the bottom area of the spherical nozzle 17 protruding out of the circular through hole of the housing 10 is provided with a nozzle arranged along the radial direction of the spherical nozzle 17, as shown in fig. 5, a nozzle inner cavity 25 vertically penetrating into the spherical nozzle 17 and communicating with the nozzle is arranged at the center of the top of the spherical nozzle 17, and the top end of the nozzle inner cavity 25 is hermetically communicated and connected with the high-pressure transport pipe 7 through a high-pressure hose 9; the external surface of the upper hemisphere of the spherical nozzle 17 is provided with a meshing tooth structure I which is convexly arranged along the radial direction, meshing teeth of the meshing tooth structure I are uniformly arranged at intervals from top to bottom according to the modulus along the external surface of the upper hemisphere of the spherical nozzle 17, each meshing tooth is in a closed circular ring shape around the axial lead of the upper hemisphere, a spherical nozzle swing control gear 16 which is in meshing connection with the meshing tooth structure I is arranged in the housing 10 in a rolling fit mode corresponding to the position of the meshing tooth structure I, and the spherical nozzle swing control gear 16 is in transmission connection with a spherical nozzle swing driving motor 12 arranged on the housing 10 through a transmission mechanism; the outer surface of the lower hemisphere of the spherical spray head 17 is provided with a meshing tooth structure II which is convexly arranged along the radial direction, meshing teeth of the meshing tooth structure II are uniformly arranged at intervals according to modulus along the horizontal circumferential direction of the outer surface of the lower hemisphere of the spherical spray head 17, the meshing tooth structure II is integrally in an annular rack structure which is in butt joint end to end, the tooth crest of each meshing tooth is an arc-shaped tooth surface structure which is consistent with the radian of the outer surface of the lower hemisphere, a spherical spray head rotation control gear 13 which is in meshing connection with the meshing tooth structure II is arranged in the housing 10 in a rolling matching mode corresponding to the position of the meshing tooth structure II, and the spherical spray head rotation control gear 13 is in transmission connection with a spherical spray head rotation driving motor 11 which is arranged on the housing 10 through a transmission mechanism; the structure of the meshing teeth I and the structure of the meshing teeth II are consistent with the radian of the outer surface of the sphere, when the spherical nozzle swing driving motor 12 or the spherical nozzle rotation driving motor 11 is independently controlled to act, the spherical nozzle swing control gear 16 or the spherical nozzle rotation control gear 13 does not influence the meshing connection state of the spherical nozzle rotation control gear 13 or the spherical nozzle swing control gear 16 by independent action.
The ground control part comprises a well cover 6, a water jet high-pressure pump station 1, a water injection pump station 4 and a centralized electric control unit 3; the top of the high-pressure transportation pipe 7 is erected and installed at the wellhead position of the gas extraction well through a well cover 6, and the top end of the high-pressure transportation pipe 7 is hermetically installed and connected with the output end of the water jet high-pressure pump station 1 through the high-pressure input pipe 2 and the high-pressure input electric control valve; the top of the positioning bag 8 is hermetically installed and connected with the output end of the water injection pump station 4 through a water delivery hose 5 and a water injection electric control valve; the centralized electric control unit 3 comprises a central control computer, a high-pressure water jet control loop, a bag water injection and drainage control loop and a hydraulic cutting repair device control loop, wherein the central control computer is respectively and electrically connected with a high-pressure input electric control valve of the high-pressure conveying pipe 7, a water injection electric control valve of the water conveying hose 5, an electric control drainage valve of the positioning bag 8, a spherical nozzle swing driving motor 12 and a spherical nozzle rotation driving motor 11.
When the gas extraction well drilling fractured deformation region repairing system is used for repairing fractured deformed well bores of gas extraction wells, computer modeling can be carried out through a central control computer of the centralized electric control unit 3 according to image data fed back by a gas extraction well drilling fractured deformation region video detection device, a gas extraction well drilling fractured deformation region mathematical model is constructed, and the depth of a fractured deformation region, the specific cutting height and the specific cutting azimuth angle of an end face and a well wall to be cut are determined;
then determining the length of the high-pressure conveying pipe 7 according to the depth of the fault-breaking deformation area, installing a positioning bag 8 on the pipe body of the high-pressure conveying pipe 7, installing a hydraulic cutting and repairing device at the bottom end of the high-pressure conveying pipe 7, then putting the high-pressure conveying pipe 7 into the gas extraction well, enabling the hydraulic cutting and repairing device to be located at a set position in the fault-breaking deformation area according to the specific cutting height of the end face and the well wall to be cut off, positioning the top of the high-pressure conveying pipe 7 through a well cover 6, and then connecting each water path pipeline and a circuit;
starting a water injection pump station 4, controlling to open a water injection electric control valve of a water delivery hose 5 and close an electric control drain valve of a positioning bag 8 by a central control computer, namely injecting pressure water into the positioning bag 8 by the water injection pump station 4 to enable the positioning bag 8 to be supported and then positioning a high-pressure delivery pipe 7, controlling a spherical sprayer swing driving motor 12 and/or a spherical sprayer rotary driving motor 11 to act according to a cutting azimuth angle of an end face to be cut and a well wall so that a spherical sprayer 17 integrally swings around the spherical center of the spherical sprayer along a horizontal axis and/or rotates along a vertical axis, and enabling the spraying direction of a nozzle at the bottom of the spherical sprayer 17 to correspond to the end face to be cut and the well wall; starting the water jet high-pressure pump station 1, controlling to open a high-pressure input electric control valve of the high-pressure transportation pipe 7 by a central control computer, jetting high-pressure water from a nozzle through the high-pressure transportation pipe 7, a high-pressure hose 9 and a nozzle inner cavity 25 to perform hydraulic cutting on the end face to be cut and the well wall, and realizing the arc-shaped cutting track of the nozzle by controlling a spherical nozzle rotary driving motor 11 in the hydraulic cutting process, wherein after the end face to be cut and the well wall are cut, the broken well hole of the broken deformation area of the gas extraction well is communicated with the broken deformation section through an inclined transition channel (shown as a dotted line in figure 1) formed by a hydraulic cutting surface; after the repair is finished, the water injection pump station 4 and the water jet high-pressure pump station 1 are closed, the central control computer controls the water injection electric control valve of the water delivery hose 5 and the high-pressure input electric control valve of the high-pressure delivery pipe 7 to be closed, the electric control drain valve of the positioning bag 8 is opened, and the high-pressure delivery pipe 7 is recovered after water in the bag 8 to be positioned is discharged.
In order to ensure the stability of the spherical nozzle 17 during the integral rotation and swing and avoid the problem of the twisting of the high-pressure hose 9 caused by the integral rotation of the spherical nozzle 17, as shown in fig. 2, as a further improvement scheme of the invention, the top of the spherical nozzle 17 is further provided with a plane rotary bearing 19 which can enable the spherical nozzle 17 to freely rotate along a vertical axis passing through the center of sphere, the top of the nozzle inner cavity 25 is communicated and connected with the high-pressure hose 9 through a hard pipe end which is connected and installed with the plane rotary bearing 19, the top of the nozzle inner cavity 25 is hermetically installed and connected with the hard pipe end, and when the spherical nozzle rotary driving motor 11 drives the spherical nozzle 17 to rotate along the vertical axis passing through the center of sphere through the spherical nozzle rotary control gear 13, the top of the nozzle inner cavity 25 rotates relative to the hard pipe end; the top of the spherical nozzle 17 is also provided with a swing guide shaft 18 which is erected on the arc-shaped clamping structure 27 in a matching mode in a positioning mode, when the spherical nozzle swing driving motor 12 drives the whole spherical nozzle 17 to swing along a transverse axis passing through the center of sphere through the spherical nozzle swing control gear 16, the swing guide shaft 18 swings along the trend of the arc-shaped clamping structure 27 along the spherical nozzle 17, and when the spherical nozzle rotary driving motor 11 drives the whole spherical nozzle 17 to rotate along a vertical axis passing through the center of sphere through the spherical nozzle rotary control gear 13, the swing guide shaft 18 does not rotate along with the spherical nozzle 17, and the swing guide shaft 18 can be arranged on the plane rotary bearing 19 or can be directly arranged on a hard pipe end. With the arrangement, in the process that the whole spherical nozzle 17 rotates along the vertical axis passing through the center of the sphere, the relative static state of the hard pipe end can be realized, and the problem of twisting of the high-pressure hose 9 is avoided; when the whole spherical nozzle 17 swings along a transverse axis passing through the center of sphere, the swing guide shaft 18 can realize positioning and guiding and ensure the stability that the whole spherical nozzle 17 swings along the center of sphere all the time.
In order to facilitate real-time accurate detection and understanding of specific breaking conditions and repairing conditions of a well body fault deformation area of a gas extraction well, as a further improvement scheme of the invention, the hydraulic cutting repairing device is further provided with a video probe 23, the video probe 23 is installed on the housing 10 through a probe connecting frame 26, the centralized electric control unit 3 further comprises a video detection control circuit, the central control computer is electrically connected with the video probe 23, and a lead can go up to the well along the high-pressure conveying pipe 7 through a fixing buckle 21 and a volute spiral spring device 20 which are fixedly arranged on the housing 10. The high-pressure conveying pipe 7 can be put into the gas extraction well, and simultaneously, the image obtained by the video probe 23 is directly fed back to the central control computer, and the central control computer can directly obtain the depth of the fault-breaking deformation area and model the fault-breaking deformation area on site according to the fed-back image data; in the repairing process, an operator can directly control the spherical sprayer swing driving motor 12 and/or the spherical sprayer rotation driving motor 11 to act and adjust the spraying angle of the nozzle on the ground through the feedback of the video probe 23.
For facilitating the omnibearing video detection, as shown in fig. 4, an annular guide rail 24 which is circular as a whole may be disposed in the circumferential direction of the bottom of the housing 10, the probe connecting frame 26 is mounted on the annular guide rail 24 through a guide wheel which is disposed in cooperation with the annular guide rail 24, and the guide wheel is provided with a guide wheel driving motor 22, and the central control computer of the centralized electric control unit 3 is electrically connected to the guide wheel driving motor 22.
In order to obtain a relatively large installation space of the ball type showerhead swing driving motor 12 and the ball type showerhead rotation driving motor 11, as a further modification of the present invention, the housing 10 is a cylindrical body having a spherical structure at a bottom end, or the whole housing 10 is of a spherical structure, the spherical nozzle swing driving motor 12 and the spherical nozzle rotation driving motor 11 are both vertically installed in the housing 10, as shown in fig. 2, a power output shaft vertically arranged by a spherical nozzle rotary driving motor 11 is in meshed transmission connection with a meshing gear structure II through a spherical nozzle rotary control gear 13 horizontally arranged, as shown in fig. 6, a power output shaft vertically arranged by the spherical nozzle swing driving motor 12 is in meshing transmission connection with a swing driving bevel gear disc ii 15 vertically arranged through a swing driving bevel gear disc i 14 horizontally arranged, and the swing driving bevel gear disc ii 15 is coaxially and fixedly connected with the spherical nozzle swing control gear 16.
In order to further increase the injection pressure, as a further improvement of the present invention, the nozzle cavity 25 has a tapered hole structure with a large upper part and a small lower part.
In order to reduce the mechanism arrangement, as a further improvement scheme of the invention, the water injection pump station 4 and the water jet high-pressure pump station 1 share the same water pressure pump station.
Aiming at gas extraction drilling wells with a plurality of fault deformation areas, after a first fault deformation area close to the ground is repaired, in order to facilitate that a hydraulic cutting repair device can smoothly enter a second fault deformation area through an inclined transition channel, as a further improvement scheme of the invention, a high-pressure transportation pipe 7 is of a structure comprising a hose part and a hard pipe part, the hard pipe part is positioned at the bottom end of the high-pressure transportation pipe 7, a positioning bag 8 is arranged on the hard pipe part of the high-pressure transportation pipe 7, and the inclined transition channel with a proper angle is cut through the hydraulic cutting repair device, so that the hard pipe part of the high-pressure transportation pipe 7 and the hydraulic cutting repair device can enter the second fault deformation area through the inclined transition channel.
The gas extraction drilling fractured deformation area repairing system is characterized in that a positioning bag 8 is propped up by injecting pressure water into the positioning bag 8, then a high-pressure conveying pipe 7 is positioned, meanwhile, a central control computer controls a spherical sprayer swinging driving motor 12 and/or a spherical sprayer rotating driving motor 11 to act according to a cutting azimuth angle of an end face to be cut and a well wall, so that a spherical sprayer 17 integrally swings along the spherical center and/or rotates to adjust the spraying angle of a nozzle, then a water jet high-pressure pump station 1 is started to carry out hydraulic cutting on the end face to be cut and the well wall, an arc-shaped cutting track of the nozzle can be realized by controlling the spherical sprayer rotating driving motor 11 in the hydraulic cutting process, after the end face to be cut and the well wall are cut, the fractured well hole of a gas extraction drilling fractured deformation area is communicated through an inclined transition channel formed by a hydraulic cutting surface, the method can recover the extraction capability of the deformed and broken gas extraction well, and is particularly suitable for repairing the well hole of the gas extraction well.
Claims (10)
1. A gas extraction well drilling fault broken deformation area repairing system is characterized by comprising a well hole repairing part and a ground control part;
the well hole repairing part comprises a high-pressure conveying pipe (7), a positioning bag (8) and a hydraulic cutting repairing device;
a positioning bag (8) of an annular closed bag structure is sleeved and fixedly arranged on the pipe body of the high-pressure conveying pipe (7), and the bottom end of the positioning bag (8) is provided with an electric control drain valve;
the hydraulic cutting repair device is arranged at the bottom end of a high-pressure conveying pipe (7) and comprises a housing (10) and a spherical sprayer (17), the housing (10) is fixedly arranged at the bottom end of the high-pressure conveying pipe (7), an arc clamping structure (27) matched with the spherical surface of the spherical sprayer (17) is fixedly arranged in the housing (10), a circular through hole coaxial with the high-pressure conveying pipe (7) is formed in the bottom end of the housing (10), the top and the bottom of the spherical sprayer (17) are respectively clamped and arranged in the housing (10) through the arc clamping structure (27) and the circular through hole of the housing (10), the spherical center of the spherical sprayer (17) is positioned on the axis of the high-pressure conveying pipe (7), a nozzle with a spraying direction arranged along the radial direction of the spherical sprayer (17) is arranged in the area at the bottom of the spherical sprayer (17) protruding out of the circular through hole of the housing (10), and the spherical sprayer (17) penetrates into the spherical sprayer (17) at the center of the top, The top end of the spray head inner cavity (25) is communicated and connected with the high-pressure conveying pipe (7) through a high-pressure hose (9); the outer surface of an upper hemisphere of the spherical sprayer (17) is provided with a meshing tooth structure I which is convexly arranged along the radial direction, meshing teeth of the meshing tooth structure I are uniformly arranged at intervals from top to bottom according to a module along the outer surface of the upper hemisphere of the spherical sprayer (17), each meshing tooth is in a closed circular ring shape around the vertical axis of the upper hemisphere, a spherical sprayer swing control gear (16) which is in meshing connection with the meshing tooth structure I is arranged in the housing (10) in a rolling fit mode corresponding to the position of the meshing tooth structure I, and the spherical sprayer swing control gear (16) is in transmission connection with a spherical sprayer swing driving motor (12) arranged on the housing (10) through a transmission mechanism; the outer surface of the lower hemisphere of the spherical spray head (17) is provided with a meshing tooth structure II which is convexly arranged along the radial direction, meshing teeth of the meshing tooth structure II are uniformly arranged at intervals according to the modulus along the horizontal circumferential direction of the outer surface of the lower hemisphere of the spherical spray head (17), the meshing tooth structure II is integrally in an annular rack structure which is butted end to end, the tooth crest of each meshing tooth is an arc-shaped tooth surface structure which is consistent with the radian of the outer surface of the lower hemisphere, a spherical spray head rotation control gear (13) which is meshed and connected with the meshing tooth structure II is arranged in the housing (10) in a rolling matching mode corresponding to the position of the meshing tooth structure II, and the spherical spray head rotation control gear (13) is in transmission connection with a spherical spray head rotation driving motor (11) arranged on the housing (10) through a transmission mechanism;
the ground control part comprises a well cover (6), a water jet high-pressure pump station (1), a water injection pump station (4) and a centralized electric control unit (3); the top of the high-pressure transport pipe (7) is erected and installed at the position of a well mouth of a gas extraction well through a well cover (6), and the top end of the high-pressure transport pipe (7) is hermetically installed and connected with the output end of the water jet high-pressure pump station (1) through a high-pressure input pipe (2) and a high-pressure input electric control valve; the top of the positioning bag (8) is hermetically installed and connected with the output end of the water injection pump station (4) through a water delivery hose (5) and a water injection electric control valve; the centralized electric control unit (3) comprises a central control computer, a high-pressure water jet control loop, a bag water injection and drainage control loop and a hydraulic cutting repair device control loop, wherein the central control computer is respectively and electrically connected with a high-pressure input electric control valve of the high-pressure conveying pipe (7), a water injection electric control valve of the water conveying hose (5), an electric control drain valve of the positioning bag (8), a spherical nozzle swing driving motor (12) and a spherical nozzle rotation driving motor (11).
2. The gas extraction drilling fracture deformation area repairing system according to claim 1, wherein a plane slewing bearing (19) capable of enabling the whole spherical nozzle (17) to freely rotate along a vertical axis passing through a sphere center is further arranged at the top of the spherical nozzle (17), the top end of a nozzle inner cavity (25) is communicated and connected with a high-pressure hose (9) through a hard pipe end which is connected with the plane slewing bearing (19) in an installing mode, the top end of the nozzle inner cavity (25) is connected with the hard pipe end in a sealing mode, and when the spherical nozzle slewing driving motor (11) drives the whole spherical nozzle (17) to rotate along the vertical axis passing through the sphere center through a spherical nozzle slewing control gear (13), the top end of the nozzle inner cavity (25) rotates relative to the hard pipe end; the top of the spherical sprayer (17) is also provided with a swing guide shaft (18) which is erected on the arc-shaped clamping structure (27) in a matched mode in a positioning mode, the spherical sprayer swing driving motor (12) drives the spherical sprayer (17) to swing integrally along a transverse axis passing through the sphere center through the spherical sprayer swing control gear (16), the swing guide shaft (18) swings along the trend of the arc-shaped clamping structure (27) along with the spherical sprayer (17), and when the spherical sprayer rotation driving motor (11) drives the spherical sprayer (17) to rotate integrally along a vertical axis passing through the sphere center through the spherical sprayer rotation control gear (13), the swing guide shaft (18) does not rotate along with the spherical sprayer (17).
3. The gas extraction drilling fracture deformation area repairing system according to claim 1 or 2, wherein a video probe (23) is further arranged on the hydraulic cutting repairing device, the video probe (23) is mounted on the housing (10) through a probe connecting frame (26), the centralized electric control unit (3) further comprises a video detection control circuit, and the central control computer is electrically connected with the video probe (23).
4. The gas extraction drilling fracture deformation area repairing system according to claim 3, characterized in that an annular guide rail (24) which is circular as a whole is arranged on the bottom of the housing (10) in the circumferential direction, the probe connecting frame (26) is installed on the annular guide rail (24) through a guide wheel which is arranged in a matched manner with the annular guide rail (24), a guide wheel driving motor (22) is arranged on the guide wheel, and a central control computer of the centralized electric control unit (3) is electrically connected with the guide wheel driving motor (22).
5. The system for repairing the fractured and deformed area of the gas extraction well according to claim 1 or 2, wherein the housing (10) is a cylindrical body with a spherical bottom end, or the housing (10) is of a spherical structure as a whole.
6. The gas extraction drilling fracture deformation area repairing system according to claim 5, wherein the spherical nozzle swing driving motor (12) and the spherical nozzle rotation driving motor (11) are vertically installed inside the housing (10), a power output shaft vertically arranged by the spherical nozzle rotation driving motor (11) is in meshing transmission connection with the meshing tooth structure II through a spherical nozzle rotation control gear (13) horizontally arranged, a power output shaft vertically arranged by the spherical nozzle swing driving motor (12) is in meshing transmission connection with a vertically arranged swing driving bevel gear disc II (15) through a swing driving bevel gear disc I (14) horizontally arranged, and the swing driving bevel gear disc II (15) is coaxially and fixedly connected with the spherical nozzle swing control gear (16).
7. The gas extraction drilling fracture deformation area repairing system according to claim 1 or 2, wherein the high-pressure conveying pipe (7) is of a structure comprising a hose portion and a hard pipe portion, the hard pipe portion is located at the bottom end of the high-pressure conveying pipe (7), and the positioning bag (8) is installed on the hard pipe portion of the high-pressure conveying pipe (7).
8. The method for repairing the fractured and deformed region of the gas extraction well of the system for repairing the fractured and deformed region of the gas extraction well according to any one of claims 1 to 7 is characterized by comprising the following steps:
a. preparation of repair: firstly, determining the depth of a fault-breaking deformation area, the specific cutting height and the cutting azimuth angle of an end face and a well wall to be cut off, installing a positioning bag (8) on a pipe body of a high-pressure conveying pipe (7), installing a hydraulic cutting and repairing device at the bottom end of the high-pressure conveying pipe (7), then putting the high-pressure conveying pipe (7) into a gas extraction well, enabling the hydraulic cutting and repairing device to be located at a set position in the fault-breaking deformation area according to the specific cutting height of the end face and the well wall to be cut off, and connecting each water path pipeline and a circuit after positioning the top of the high-pressure conveying pipe (7) through a well cover (6);
b. hydraulic cutting and repairing: starting a water injection pump station (4), controlling a water injection electric control valve for opening a water delivery hose (5) and an electric control drain valve for closing a positioning bag (8) by a central control computer, controlling the water injection pump station (4) to inject pressure water into the positioning bag (8) to enable the positioning bag (8) to be supported and then positioning a high-pressure delivery pipe (7), simultaneously controlling a spherical nozzle swing driving motor (12) and/or a spherical nozzle rotation driving motor (11) to act according to a cutting azimuth angle of an end face to be cut and a well wall so as to enable a spherical nozzle (17) to integrally swing along a horizontal axis and/or rotate along a vertical axis around the spherical center of the spherical nozzle (17), starting a water jet high-pressure pump station (1) when the injection direction of a nozzle at the bottom of the spherical nozzle (17) corresponds to the end face to be cut and the well wall, controlling a high-pressure input valve for opening the high-pressure delivery pipe (7) to be electrically controlled by the central control computer, controlling high-pressure water to be sprayed out from a nozzle through a high-pressure conveying pipe (7), a high-pressure hose (9) and a nozzle inner cavity (25) to perform hydraulic cutting on the end surface to be cut and the well wall, and controlling a spherical nozzle to rotate a driving motor (11) to realize an arc-shaped cutting track of the nozzle in the hydraulic cutting process;
c. equipment recovery: after the end face and the well wall which need to be cut off are cut off, the water injection pump station (4) and the water jet high-pressure pump station (1) are closed, the central control computer controls the water injection electric control valve for closing the water delivery hose (5) and the high-pressure input electric control valve for the high-pressure delivery pipe (7) and opens the electric control drain valve for the positioning bag (8), and after water in the bag (8) to be positioned is discharged, the high-pressure delivery pipe (7) is recovered and goes to the well.
9. The method for repairing the fractured and deformed region of the gas extraction well according to claim 8, wherein in the step a, the depth of the fractured and deformed region, the specific cutting height and the cutting azimuth angle of the end face and the well wall to be cut off are determined, a video detection device of the fractured and deformed region of the gas extraction well is put into the gas extraction well, computer modeling is carried out through a central control computer of a centralized electric control unit (3) according to image data fed back by the video detection device of the fractured and deformed region of the gas extraction well, a mathematical model of the fractured and deformed region of the gas extraction well is constructed, and the depth of the fractured and deformed region, the specific cutting height and the cutting azimuth angle of the end face and the well wall to be cut off are determined.
10. The method for repairing the fractured and deformed area of the gas extraction well according to claim 8, wherein a video probe (23) is further arranged on the hydraulic cutting and repairing device, the video probe (23) is mounted on the housing (10) through a probe connecting frame (26), the centralized electric control unit (3) further comprises a video detection control circuit, and the central control computer is electrically connected with the video probe (23);
the method for determining the depth of the fault-breaking deformation region, the specific cutting height and the specific cutting azimuth angle of the end face and the well wall to be cut off in the step a is characterized in that when a high-pressure conveying pipe (7) is put into a gas extraction well, an image obtained by a video probe (23) is fed back to a central control computer, and the central control computer carries out on-site acquisition of the depth of the fault-breaking deformation region and computer modeling according to fed-back image data;
in the step b, an operator controls the spherical sprayer swinging driving motor (12) and/or the spherical sprayer rotating driving motor (11) to act and adjust the spraying angle of the nozzle through a central control computer on the ground according to the feedback of the video probe (23).
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