CN107313745B - Well cementation method for reinforcing coal-bed gas well through multi-node intensive grouting in goaf - Google Patents
Well cementation method for reinforcing coal-bed gas well through multi-node intensive grouting in goaf Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 53
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 19
- 230000007774 longterm Effects 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 21
- 239000002002 slurry Substances 0.000 claims description 19
- 239000003245 coal Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 14
- 239000011257 shell material Substances 0.000 claims description 14
- 230000002787 reinforcement Effects 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 241000208202 Linaceae Species 0.000 claims description 3
- 235000004431 Linum usitatissimum Nutrition 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 23
- 239000011440 grout Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 210000003000 inclusion body Anatomy 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
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Abstract
The invention belongs to the technical field of coalbed methane exploitation, and aims to solve the problems that a three-open drilling construction process is complex and the structural stability of a three-open well body is poor when a goaf is traversed, and provides a cementing method for reinforcing a coalbed methane well through multi-node intensive grouting in the goaf. According to the invention, the cement paste inclusion supporting structure with multiple joints is formed between the technical sleeve and the well wall surrounding rock, so that the long-term stability of the well wall surrounding rock and the well body structure of the coal-bed gas well can be greatly enhanced.
Description
Technical Field
The invention belongs to the technical field of coalbed methane exploitation, and particularly relates to a method for reinforcing a coalbed methane well by multi-node intensive grouting in a goaf for reinforcing grouting and well cementation construction of a well wall surrounding rock of the coalbed methane well.
Background
Because the service life of the coal-bed gas well is longer, the stability and safety of the mining well are required to be kept in the service life, and particularly, when the coal-bed gas well passes through the goaf, the coal-bed gas well is damaged or destroyed due to the influence of the residual deformation of the old goaf and the disturbance of the new mining area. In engineering practice, a control method is commonly adopted, namely, a plurality of layers of sleeves are nested and grouting is used for reinforcement, so that the well cementation construction of the coal bed gas well is realized. For example, a typical coalbed methane well, a well bore structure and its construction process when traversing a production space are: (1) A drill bit of D425 is drilled, the drill bit is drilled into bedrock for 10m, and the surface sleeve of D377 is put into the drill bit to prevent the collapse of the fourth loose layer; (2) Drilling a D311.15 drill bit to 20m below the goaf coal seam floor, putting a technical sleeve of D244.5, sealing the sleeve bottom opening by cement paste, returning the sleeve bottom opening to the goaf coal seam floor, and waiting for solidification; (3) Drilling with a D215.9 drill bit for three exploitation, finishing drilling to a certain depth of a bottom plate of a coal seam to be exploited at the lower layer, putting a production sleeve of D139.7, grouting from the bottom of the sleeve, and returning cement slurry in the production sleeve and the technical sleeve to the surface of the earth, thereby finishing.
The main technical problems encountered in the actual engineering are as follows:
(1) The existing construction method only performs reinforcement at the wellhead and the bottom of the well, can not realize reinforcement and close adhesion between the middle drilling area and surrounding rock, does not have any supporting structure between the technical sleeve and the surrounding rock of the well wall, and has insufficient long-term stability between the surrounding rock of the well wall of the coal-bed gas well and the well body structure.
(2) The overburden formation is very fractured by the disturbance of the goaf, and there are a caving zone and a fracture zone. In the drilling process, if pressure grouting is performed, a great amount of leakage of grouting liquid often occurs, and the grouting reinforcement area and quality cannot be judged and detected. Particularly in caving zones, if grouting and reinforcing are carried out on the side wall of the well, the flow direction, the range and the quality of grouting liquid are difficult to control.
(3) A large number of sleeves are put in the drilling process, the construction process is complex, and the construction cost is high. The method reduces the sleeve consumption in the broken rock mass, and is an important way for improving the construction efficiency and reducing the cost.
Disclosure of Invention
The invention aims to solve the problems that when a mined-out area is penetrated, the three-open-hole drilling construction process is complex and the stability of the three-open-hole well structure is poor, and further provides a well cementation method for reinforcing a coal-bed gas well through multi-node intensive grouting of the mined-out area.
The invention adopts the following technical scheme:
a well cementation method for reinforcing a coal-bed gas well through multi-node intensive grouting in a goaf adopts a three-hole drilling construction process, a well body of the coal-bed gas well consists of a first-hole drilling hole, a surface sleeve, a second-hole drilling hole, a technical sleeve and a third-hole drilling hole, and when the three-hole drilling construction is carried out, the multi-node grouting reinforcement is carried out on surrounding rocks of a well wall outside the technical sleeve, so that the strength of the surrounding rocks of the well wall is increased, the long-term stability of the coal-bed gas well is ensured, and the stable technical sleeve is directly used as a production sleeve of the coal-bed gas well; the multi-junction grouting portion includes:
pouring inner layer casing materials of the orifice of the coal-bed gas well, pouring outer layer casing materials and reinforcing locking notch steel firmware;
grouting nodes at two open bottoms of the well body;
a plurality of pipe skirt grouting joints of a fracture zone and a caving zone in the middle of the well body.
The grouting joint of the pipe skirt is a cement paste inclusion supporting structure formed by grouting reinforcement between a technical sleeve and two drilling well wall surrounding rocks by adopting the pipe skirt technology, wherein the pipe skirt technology is to set grouting holes, sleeve valves and pipe skirts in a preset grouting section of the technical sleeve and to perform grouting reinforcement on the drilling side wall by adopting sectional grouting.
The concrete well cementation construction process comprises the following steps:
1) Drilling a drill bit to penetrate through the fourth series loose layer, and finishing drilling the drill bit to 10-20m in the bedrock deflection zone;
2) The surface sleeve is protected, in a drilled hole, the surface sleeve is put down to the bottom of the hole, an outer layer sleeve shell material is prepared, and the surface sleeve is poured in from a hole opening surface sleeve and a drilled hole gap, filled with waiting solidification, and fixed;
3) Preparing a technical sleeve with a pipe skirt, arranging a grouting hole on the technical sleeve at the pipe skirt part, and arranging a sleeve valve at the outer side of the technical sleeve at the grouting hole; drilling by adopting a two-hole drill bit, and penetrating through a bedrock deflection zone, a fracture zone and a caving zone; when broken bedrock is encountered, a technical sleeve is put into and drilled with the sleeve, and the sleeve is drilled to a weaker stratum below the coal bed bottom plate of the goaf in the affected area, and the drilling is completed; the tube skirt on the technical sleeve is distributed in the fracture zone and the caving zone at multiple points;
4) Cementing the bottom of the technical sleeve, sealing the bottom opening of the sleeve by adopting cement slurry sealing technology, and returning cement slurry to the bottom plate of the coal bed in the goaf and the caving zone of the goaf through grouting to form two open-pore bottom grouting nodes for waiting for coagulation;
5) Cementing the top of the technical sleeve, filling an inner layer sleeve shell material into the hole between the surface sleeve and the technical sleeve at the hole part, and welding or hinging the surface sleeve and the technical sleeve by adopting a locking steel fastener to form a stable wellhead;
6) Cementing the middle part of the technical sleeve, putting a grouting device into the grouting junction part of the lowest pipe skirt, injecting clean water at high pressure to open a sleeve valve grouting hole, injecting cement slurry at high pressure, gradually filling the pipe skirt with the grouting liquid, swelling and infiltrating water, maintaining for 3-5min, and ending grouting when the pressure is obviously increased;
7) Moving the grouting device along the technical sleeve towards the orifice direction, searching the 2 nd preset grouting nodes of the pipe skirt, repeating the grouting process of the step 6) until grouting of all the grouting nodes of the pipe skirt is completed, forming a multi-node grouting inclusion, enabling the technical sleeve to be closely attached to the well wall, completing middle well cementation, pulling the grouting device out of the technical sleeve, and waiting for grouting;
8) And after the strength of the grouting inclusion meets the requirement, drilling by adopting a three-start drill bit until the preset depth of the bottom plate of the lower layer coal seam to be mined is reached, and finishing drilling.
The tube skirt on the technical sleeve is provided with 2-4 points along the well body direction.
The pipe skirt is square material made of water-permeable flax cloth or geosynthetic material (refer to Xu Chao book of geosynthetic material), the square material is arranged around the technical sleeve at least for a circle, the top end of the square material is connected with the technical sleeve through a pipe skirt upper buckling ring, the bottom end of the square material is buckled inwards, and the square material is connected with the technical sleeve through a pipe skirt lower buckling ring to form a skirt-shaped grouting area which is wrapped around the technical sleeve and restrains a grouting range.
The length of the square material (i.e. the drilling depth direction) is not less than 1.5 times of the length of the grouting junction point of the pipe skirt, and the width of the pipe skirt is not less than 2 times of the circumference of the two drilling holes.
The sleeve valve is formed by binding a rubber thin belt with better elasticity on the outer side of the technical sleeve at the grouting hole. The sleeve valve is a one-way closing device which can only discharge slurry outside the pipe and can not return slurry inside the pipe.
The method comprises the steps that a sectional high-pressure grouting device is adopted during grouting, the sectional high-pressure grouting device comprises a pipe body, the pipe body is of a three-section integrated structure, the middle part of the pipe body is provided with a flower pipe with a plurality of grouting grooves, the upper part and the lower part of the pipe body are respectively provided with screw threads, a grouting stop combination is respectively arranged at the upper screw threads and the lower screw threads, a section between the upper grouting stop combination and the lower grouting stop combination is a grouting section, and the upper grouting stop combination can move up and down along the screw threads at the upper part of the grouting device; the top of the screw thread at the upper part of the grouting device is provided with a locking joint for being matched and connected with a drill rod and a grouting pipe.
The slurry stop plug combination comprises a clamping bolt, a rubber sealing ring and an elastic soft rubber ring, wherein the clamping bolt is connected with a screw thread in a matched manner, and the rubber sealing ring and the elastic soft rubber ring are parallel to each other and are coaxially and closely sleeved between the clamping bolt and the sleeve to form a double-layer sealing slurry stop structure. The rubber sealing ring is arranged on the outer side of the elastic soft rubber ring. Namely, for the upper grout stop combination, the elastic soft rubber ring is arranged below the rubber sealing ring, and for the lower grout stop combination, the elastic soft rubber ring is arranged above the rubber sealing ring, so that the inner side is described relative to grouting liquid, the elastic soft rubber ring forms a first layer of seal which is in direct contact with the grouting liquid, and the rubber sealing ring forms a second layer of seal.
The length of the grouting section is 0.5-1m.
The grouting grooves are rectangular notches parallel to the axis direction of the pipe body, at least three layers of the grouting grooves are arranged along the axis direction of the pipe body, each layer of grouting grooves is at least 3 notches, and the notches of the adjacent layers of grouting grooves are arranged in a staggered mode. Ensuring uniform slurry outlet in the grouting section.
The invention has the following beneficial effects:
(a) The pressure grouting is carried out in the middle fracture zone and the caving zone area of the drilling well, so that the technical sleeve is closely attached to surrounding rock, a cement paste inclusion supporting structure with multiple joints is formed between the technical sleeve and the surrounding rock of the well wall, and the long-term stability of the surrounding rock and the well body structure of the well wall of the coal-bed gas well can be greatly enhanced; (b) By arranging grouting holes, sleeve valves and tube skirts at preset positions (grouting sections) of the technical sleeve, grouting reinforcement of the drilling side wall is realized by adopting a sectional grouting device, the existence of the tube skirts ensures the flow direction and grouting range of grouting liquid, and grouting quality and controllability thereof are obviously improved; (c) The technical sleeve is used as a final production sleeve, so that the sleeve consumption is saved. Meanwhile, the stabilizing points of the technical sleeve comprise grouting inclusion bodies of a wellhead, a shaft bottom and a plurality of nodes, so that the intensification of the well drilling grouting well cementation construction is embodied, the construction procedure is optimized, and the quality is improved.
Meanwhile, the following technical problems can be solved by utilizing the sectional high-pressure grouting device:
(a) Grouting between the casing and the well wall in sections in the casing is realized, and the length of the grouting section can be selected;
(b) Setting a double-layer grouting valve to realize high-pressure grouting;
(c) The independent high-pressure grouting pipe is arranged, and the common exploration drill pipe can be connected with a grouting device, so that grouting equipment is simplified.
Therefore, the grouting device is used for grouting and reinforcing the outside of the casing pipe of the coal-bed gas well, high-pressure grouting with variable section length can be realized in a designated drilling inner section or position, surrounding rock of the casing pipe outer well wall in a designated area is reinforced, the casing pipe is closely attached to the well wall, and the stability of the coal-bed gas well is greatly enhanced.
Drawings
FIG. 1 is a cross-sectional view of a well cementing;
FIG. 2 is a large sample of grouting nodes of the tube skirt;
fig. 3 is a schematic structural view of a segmented high pressure grouting device.
In the figure: 1. a fourth line; 2. a bedrock deflection zone; 3. a fracture zone; 4. a landing belt; 5. an upper coal seam; 6. a coal seam floor; 7. a lower coal seam; 8. an orifice; 9. locking notch steel firmware; 10. a first drill hole; 11. a surface layer sleeve; 12. an outer shell material; 13. a technical sleeve; 14. an inner layer shell material; 15. a bedrock surface; 16. drilling holes at two times; 17. grouting nodes of the tube skirt; 18. grouting nodes with two open bottoms; 19. three-hole drilling; 20. the pipe skirt is buckled with a binding ring; 21. grouting holes; 22. the lower part of the tube skirt is buckled with the binding ring; 23. a tube skirt; 24. grouting pipe;
31. a drill rod; 32. grouting pipe; 33. a sleeve; 34. a lock joint; 35. screw threads are arranged at the upper part of the grouting device; 36. clamping bolts; 37. a rubber seal ring; 38. an elastic soft rubber ring; 39. grouting grooves; 40. screw threads at the bottom of the grouting device; 41. a tube body.
Detailed Description
The method mainly adopts a tube skirt technology, and a multi-junction grouting inclusion (reinforcement) is formed between the two-hole drilling 16 and the technical sleeve 13, so that the strength of surrounding rock of a well wall is increased, and meanwhile, the technical sleeve 13 and the well wall are well coupled and firmly supported, so that the long-term stability of the coal-bed gas well can be ensured. Meanwhile, after the three-hole drilling 19 is formed, the production casing is not installed any more, and the stable technical casing 13 is directly used as the production casing of the coal-bed gas well. Therefore, the purposes of optimizing construction procedures, improving efficiency and reducing cost are achieved, and the intensive concept of coal-bed gas well construction is embodied.
The technical key points of the invention are as follows:
(1) The method aims at the situation that the well body of the coal-bed gas well consists of a one-hole drilling 10+surface casing 11, a two-hole drilling 16+technical casing 13 and a three-hole drilling 19. In order to strengthen the long-term stability of the coal-bed gas well and reduce the cost, one of the key technologies of the invention is adopted, namely, multi-node grouting reinforcement is carried out on the wall surrounding rock of the outer wall of the technical sleeve 13, and the technical sleeve 13 is used as the final production sleeve. The multi-junction grouting part comprises: (1) the inner shell material 14 of the aperture 8 is infused and the outer shell material 12 is infused and the locking notch steel fastener 9 is reinforced; (2) two open bottom grouting nodes 18; (3) a plurality of pipe skirt grouting junctions 17 of the well middle fracture zone 3 and the riser zone 4.
(2) The grouting reinforcement between the technical sleeve 13 and the wall of the two-way drilling 16 is carried out by adopting a pipe skirt grouting technology at the depth of the pipe skirt grouting joint 17 parts of the fracture zone 3 and the caving zone 4 in the middle of the well body, the arrangement of the pipe skirt 23 ensures the flow direction and the grouting range of grouting liquid, and the grouting quality and the controllability thereof are obviously improved. Wherein, the pipe skirt 23 is made of flax cloth or geosynthetic material with certain water permeability into square shape, the length is 1.5 times of the length of the grouting section, the width is 2 times of the circumference of the two-open drilling hole 16, and the pipe skirt is wrapped around the technical sleeve 13 to form a skirt-shaped grouting area for restraining the grouting range. Accordingly, leakage or leakage of grouting liquid can be avoided, a surrounding body of the technical sleeve 13 is rapidly formed, after grouting liquid is coagulated, the sleeve is closely attached to the wall of the two drilling holes, the stability of the technical sleeve is guaranteed, the technical sleeve can be directly used as a production sleeve, and intensification is achieved.
The specific implementation process of the invention is as follows:
1) A drill bit is used to drill holes through the unconsolidated formation of the fourth train 1 to about 10-20m finish drill into the bedrock deflection zone 2.
2) The surface sleeve 11 is provided with a wall, the surface sleeve 11 is put into a hole 10, an outer shell material 12 is prepared, and the surface sleeve 11 is filled in a gap between the hole surface sleeve 11 and the hole 10 to fill with waiting solidification, and the surface sleeve 11 is fixed.
3) The technical sleeve 13 with the tube skirt 23 is prepared, the technical sleeve 13 at the position of the tube skirt 23 is provided with a grouting hole 21, and a rubber thin belt with better elasticity is bound on the outer side of the sleeve to form a sleeve valve. And drilling by adopting a two-hole drill bit, and penetrating through the bedrock deflection zone 2, the fracture zone 3 and the caving zone 4. When the bedrock is broken, the technical sleeve 13 is put into the pipe to drill into the weaker stratum of the affected area below the goaf coal seam bottom plate 6, and the drilling is completed. The tube skirt 23 on the technical sleeve 13 is distributed at multiple points (typically 2-4 points) in the fracture and riser zones.
4) And (3) cementing the bottom of the technical sleeve 13, sealing the bottom opening of the sleeve by cement slurry, and returning the cement slurry to the goaf coal seam bottom plate 6 and the goaf caving belt 4 through grouting to form two open-pore bottom grouting nodes 18 for waiting to coagulate.
5) The top of the technical sleeve 13 is well fixed, an inner layer sleeve shell 14 is filled between the surface sleeve 11 and the technical sleeve 13 at the position of the orifice 8 to the orifice, and the surface sleeve 11 and the technical sleeve 13 are welded or hinged by adopting a locking steel fastener 9 to form a stable wellhead.
6) The middle part of the technical sleeve 13 is well cemented, a grouting device 24 is arranged at the position of a grouting joint 17 of the lowest pipe skirt, clean water is injected at high pressure firstly, so that sleeve valve grouting holes are opened, cement slurry is injected at high pressure, the pipe skirt 23 is gradually filled with the grouting slurry, swells and permeates water, the grouting liquid is maintained for 3-5min, and the grouting device can be ended when the pressure is obviously increased.
7) And (3) moving the grouting device 24 along the technical sleeve 13 towards the direction of the orifice 8, searching a 2 nd preset grouting node 17 of the pipe skirt, repeating the grouting process of the step (6) until all the grouting is completed, forming a multi-node grouting inclusion, enabling the technical sleeve 13 to be closely attached to the well wall, completing the middle well cementation, pulling the grouting device 24 out of the technical sleeve 13, and waiting for the grouting.
8) And after the strength of the grouting inclusion meets the requirement, drilling by adopting a three-drill bit until the preset depth of the bottom plate of the lower layer coal seam 7 to be mined is reached, and finishing drilling.
The key connection parts in the construction process are as follows:
at the position of the orifice 8, the surface sleeve 11 and the fourth series stratum are filled with an outer sleeve shell material 12 for bonding and reinforcing, the top of the surface sleeve 11 and the top of the technical sleeve 13 are welded or hinged by adopting a locking notch steel fixing piece 9, and the sleeves are filled with an inner sleeve shell material 14 for bonding. The outer layer shell material and the inner layer shell material are respectively prepared by mixing cement, soil and water according to the ratio of 1:1.5:1.80.
The tube skirt 23 and the technical sleeve 13 are bound around the tube wall through the tube skirt upper buckling ring 20 and the tube skirt lower buckling ring 22. And binding a rubber thin belt with better elasticity on the outer side of the sleeve at the grouting hole 21 of the technical sleeve 13 to form a sleeve valve. The grouting device 24 is closely attached to the inner wall of the technical sleeve 13 through a double-layer grouting valve and is driven by a drill rod to move up and down in the pipe.
Cement paste is adopted to bond the technical sleeve 13 and the walls of the two holes 16, and part of cement paste is pressed into the coal bed bottom plate 6 and the caving belt 4 to form a cement paste anchoring body.
When grouting, a sectional high-pressure grouting device shown in fig. 3 is adopted, the pipe body of the sectional high-pressure grouting device is divided into an upper part, a middle part and a lower part, the upper part of the grouting device is provided with screw threads with the length of 0.1-0.5m, the middle part of the grouting device is provided with a flower pipe part with 3 pairs of grouting grooves, the length of the grouting device is about 0.5m, and the lower part of the grouting device is provided with screw threads with the length of 0.2 m. And the grouting stopper combination (comprising three clamping bolts, a rubber sealing ring and an elastic soft rubber ring) is arranged at the screw thread at the upper part of the grouting device and the screw thread at the bottom of the grouting device. The upper grouting stop combination can move along the screw thread at the upper part of the grouting device, so that grouting between the sleeve and the well wall is realized in sections in the sleeve, the length of a grouting section can be selected, and the length range is generally selected to be 0.5-1.0m. The rubber sealing ring and the elastic soft rubber ring are arranged in the grouting plug combination, the grouting plug combination has the double-layer grouting effect, the elastic soft rubber ring is pressed and closely attached to the sleeve under the grouting pressure effect, the grouting performance is remarkably improved, and high-pressure grouting is realized.
The special lock joint can be connected with the drill rod, the grouting pipe and the screw thread at the upper part of the grouting device, the drill rod can select a common exploration drill rod, the grouting pipe adopts a high-pressure grouting pipe, the flexibility of equipment material selection is improved, and the cost is reduced.
The use flow of the sectional high-pressure grouting device is as follows:
(1) And selecting a grouting device pipe body with a proper diameter, and preparing corresponding accessories including a drill rod, a grouting pipe, a lock joint, a clamping bolt, a rubber sealing ring, an elastic soft rubber ring and the like.
(2) The lower grout stop plug combination (comprising three clamping bolts, a rubber sealing ring and an elastic soft rubber ring) is screwed on the screw buckle at the bottom of the grouting device in sequence.
(3) The upper grouting stop combination (comprising three clamping bolts, a rubber sealing ring and an elastic soft rubber ring) is screwed on the screw thread on the upper part of the grouting device in sequence, and the length of the grouting section is adjusted according to the requirement, so that the grouting stop combination is stopped at a certain fixed position.
(4) And (3) connecting the first section of drill rod and the corresponding grouting pipe with the locking joint in a threaded manner, and hoisting the grouting device into the sleeve.
(5) According to the method, the drill rod and the grouting pipe are sequentially connected to reach the part needing grouting in the sleeve.
(6) And injecting clean water from the grouting pipe at high pressure at the pipe orifice of the ground, enabling the high-pressure water to enter the grouting device, extruding the elastic soft rubber ring to be closely adhered to the pipe wall, and grouting Kong Pokai on the sleeve.
(7) And (3) preparing grouting liquid at a ground wellhead, injecting the grouting liquid from a grouting pipe at high pressure, and pressing the grouting liquid into a gap between a sleeve and a well wall from a sleeve grouting hole, so that sectional grouting reinforcement is realized.
(8) The grouting device can be lifted to the pipe orifice in time to reach the grouting requirement, and the grouting device is flushed.
The connection points and the relation of the sectional high-pressure grouting device are as follows:
the drill rod is connected with the grouting pipe through a lock joint, and the lock joint is connected with the upper grouting device through threads. The grouting stopper combination at the upper part of the grouting device comprises clamping bolts (3), a rubber sealing ring and an elastic soft rubber ring, wherein the grouting stopper combination is provided with an inner ring, inner sleeve threads in the inner ring sequentially pass through one end of the upper part of the grouting device and are screwed to a fixed position along the threads at the upper part of the grouting device. The rubber sealing ring and the elastic soft rubber ring are clamped by the clamping bolts. The grouting stopper assembly at the lower part of the grouting device comprises clamping bolts (3), a rubber sealing ring and an elastic soft rubber ring, wherein the grouting stopper assembly is provided with an inner ring, inner sleeve threads in the inner ring sequentially pass through screw threads at the bottom of the grouting device and are screwed to a fixed position. The rubber sealing ring and the elastic soft rubber ring are clamped by three clamping bolts. The upper and lower slurry stop plug combination is closely attached to the sleeve.
Claims (8)
1. The well cementation method for reinforcing the coal-bed gas well by multi-node intensive grouting in the overgoaf adopts a three-hole drilling construction process, and the well body of the coal-bed gas well consists of a first-hole drilling hole (10), a surface sleeve (11), a second-hole drilling hole (16), a technical sleeve (13) and a three-hole drilling hole (19), and is characterized in that the multi-node grouting reinforcement is carried out on the surrounding rock of the wall of the technical sleeve (13), so that the strength of the surrounding rock of the wall of the well is increased, the long-term stability of the coal-bed gas well is ensured, and the stable technical sleeve (13) is directly used as a production sleeve of the coal-bed gas well; the multi-junction grouting portion includes:
pouring an inner layer casing material (14) of a coal-bed gas well orifice (8), pouring an outer layer casing material (12) and reinforcing a locking notch steel firmware (9);
two open hole bottom grouting joints (18) of the well body;
a plurality of pipe skirt grouting joints (17) of a well middle fracture zone (3) and a caving zone (4);
the pipe skirt grouting joint (17) is a cement paste inclusion supporting structure formed by grouting and reinforcing between a technical sleeve (13) and a wall surrounding rock of a two-hole drilling hole (16) by adopting a pipe skirt technology, wherein the pipe skirt technology is to set grouting holes, sleeve valves and pipe skirts in a preset grouting section of the technical sleeve (13) and to perform grouting and reinforcing on the side wall of the drilling hole by adopting sectional grouting;
the pipe skirt (23) is square material made of water-permeable flax cloth or geosynthetic material, the square material is arranged around the technical sleeve (13) at least for a circle, the top end of the square material is connected with the technical sleeve (13) through the pipe skirt upper buckling ring (20), the bottom end of the square material is buckled inwards, and the square material is connected with the technical sleeve (13) through the pipe skirt lower buckling ring (22) to form a skirt-shaped grouting area which is wrapped around the technical sleeve (13) and restrains a grouting range.
2. The method for reinforcing the well cementation of the coalbed methane well by multi-node intensive grouting of the goaf according to claim 1, which is characterized in that the concrete well cementation construction process comprises the following steps:
1) Drilling a drill bit to penetrate through the loose layer of the fourth system (1) until 10-20m of the bedrock deflection zone (2) is drilled, and finishing drilling a drill bit (10);
2) The surface sleeve (11) is used for protecting the wall, the surface sleeve (11) is put into a hole (10) to the bottom of the hole, an outer shell material (12) is prepared, the hole is filled with the surface sleeve (11) and the hole (10) at a gap, the waiting solidification is filled, and the surface sleeve (11) is fixed;
3) Preparing a technical sleeve (13) with a pipe skirt (23), arranging a grouting hole (21) on the technical sleeve (13) at the pipe skirt (23), and arranging a sleeve valve outside the technical sleeve (13) at the grouting hole (21); drilling by adopting two drill heads, and penetrating through a bedrock deflection zone (2), a fracture zone (3) and a caving zone (4); when broken bedrock is encountered, a technical sleeve (13) is put into the drill with the pipe, and the drill is carried out until the weaker stratum in the affected area below the goaf coal seam bottom plate (6) is drilled; the pipe skirt (23) on the technical sleeve (13) is distributed in the fracture zone and the caving zone at multiple points;
4) The bottom of the technical sleeve (13) is well fixed, cement slurry is adopted to seal the bottom opening of the technical sleeve (13), cement slurry is returned to the goaf coal bed bottom plate (6) and the goaf caving belt (4) through grouting, two open-pore bottom grouting nodes (18) are formed, and the goaf coal bed bottom plate and the goaf caving belt are subjected to waiting solidification;
5) Cementing the top of the technical sleeve (13), filling an inner layer sleeve shell material (14) between the surface sleeve (11) and the technical sleeve (13) at the position of the orifice (8), and welding or hinging the surface sleeve (11) and the technical sleeve (13) by adopting a locking steel fastener (9) to form a stable wellhead;
6) The middle part of the technical sleeve (13) is well fixed, a grouting device (24) is arranged at the position of a grouting junction (17) of the lowest pipe skirt, clean water is injected at high pressure firstly, a sleeve valve grouting hole (21) is opened, cement slurry is injected at high pressure, the pipe skirt (23) is gradually filled with grouting liquid, swells and permeates water, the grouting is maintained for 3-5min, and grouting is finished;
7) Moving a grouting device (24) along the technical sleeve (13) towards the direction of the orifice (8), searching a 2 nd preset pipe skirt grouting node (17), repeating the grouting process of the step 6) until grouting of all the pipe skirt grouting nodes (17) is completed, forming a multi-node grouting inclusion, enabling the technical sleeve (13) to be closely attached to a well wall, completing middle well cementation, pulling the grouting device (24) out of the technical sleeve (13), and waiting for grouting;
8) And after the strength of the grouting inclusion meets the requirement, drilling by adopting a three-drill bit until the preset depth of the bottom plate of the lower layer coal seam (7) to be mined is reached, and finishing drilling.
3. The method for cementing a coalbed methane well by multi-junction intensive grouting in a goaf according to claim 2, which is characterized by comprising the following steps: the pipe skirt (23) on the technical sleeve (13) is provided with 2-4 points along the well body direction.
4. The method for cementing a coalbed methane well by multi-junction intensive grouting in a goaf according to claim 3, which is characterized by comprising the following steps: the length of the square material is not less than 1.5 times of the length of the grouting junction (17) of the pipe skirt, and the width of the pipe skirt (23) is not less than 2 times of the circumference of the two-way drilling hole (16).
5. The method for cementing a coalbed methane well by multi-junction intensive grouting in a goaf according to claim 4, which is characterized by comprising the following steps: the sleeve valve is formed by binding a rubber thin belt with better elasticity on the outer side of a technical sleeve (13) at a grouting hole (21).
6. The method for cementing a coalbed methane well by multi-junction intensive grouting in a goaf according to claim 5, which is characterized by comprising the following steps: the method comprises the steps that a sectional high-pressure grouting device is adopted during grouting, the sectional high-pressure grouting device comprises a pipe body (41), the pipe body (41) is of a three-section integrated structure, the middle part of the pipe body (41) is a flower pipe provided with a plurality of grouting grooves (39), the upper part and the lower part of the pipe body (41) are respectively provided with screw threads, a grouting plug combination is respectively arranged at the upper screw threads and the lower screw threads, a grouting section is arranged at a section between the upper grouting plug combination and the lower grouting plug combination, and the upper grouting plug combination can move up and down along the screw threads at the upper part of the grouting device; the top end of the screw thread at the upper part of the grouting device is provided with a locking joint (34) which is used for being matched and connected with a drill rod (31) and a grouting pipe (32).
7. The method for cementing a coalbed methane well by multi-junction intensive grouting in a goaf according to claim 6, which is characterized by comprising the following steps: the slurry stop plug assembly comprises a clamping bolt (36), a rubber sealing ring (37) and an elastic soft rubber ring (38), wherein the clamping bolt (36) is connected with a screw thread in a matched manner, and the rubber sealing ring (37) and the elastic soft rubber ring (38) are mutually parallel and coaxially tightly sleeved between the clamping bolt (36) and the sleeve (33) to form a double-layer sealing slurry stop structure; the rubber sealing ring (37) is arranged on the outer side of the elastic soft rubber ring (38).
8. The method for cementing a coalbed methane well by multi-junction intensive grouting in a goaf according to claim 7, which is characterized by comprising the following steps: the length of the grouting section is 0.5-1m.
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| CN109989726B (en) * | 2018-11-22 | 2024-06-11 | 中煤地质集团有限公司 | Divided downhole fixed-point injector and method for repairing water supply pipe well by using same |
| CN110714737B (en) * | 2019-11-09 | 2023-06-20 | 中为(上海)能源技术有限公司 | Well cementation system and method for underground coal gasification process |
| CN110778317A (en) * | 2019-11-12 | 2020-02-11 | 中煤能源研究院有限责任公司 | Construction method for ground grouting filling drilling structure in caving zone in mining process |
| CN111750551B (en) * | 2020-06-24 | 2021-02-02 | 中建一局集团建设发展有限公司 | Energy pile pre-buried pipeline system and method based on multifunctional sleeve valve pipe |
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