CN107313745A - A kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf - Google Patents
A kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf Download PDFInfo
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- CN107313745A CN107313745A CN201710587003.3A CN201710587003A CN107313745A CN 107313745 A CN107313745 A CN 107313745A CN 201710587003 A CN201710587003 A CN 201710587003A CN 107313745 A CN107313745 A CN 107313745A
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- protective casing
- grouting
- pipe
- slip casting
- bed gas
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- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 30
- 230000001681 protective effect Effects 0.000 claims abstract description 89
- 238000005553 drilling Methods 0.000 claims abstract description 47
- 239000011435 rock Substances 0.000 claims abstract description 32
- 239000011083 cement mortar Substances 0.000 claims abstract description 14
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 230000007774 longterm Effects 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract 2
- 238000007569 slipcasting Methods 0.000 claims description 81
- 238000007582 slurry-cast process Methods 0.000 claims description 35
- 239000003292 glue Substances 0.000 claims description 21
- 239000002002 slurry Substances 0.000 claims description 21
- 239000011257 shell material Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 10
- 230000011218 segmentation Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000010412 perfusion Effects 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000002689 soil Substances 0.000 description 2
- 241001484259 Lacuna Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
Classifications
-
- 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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Piles And Underground Anchors (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to Coal-seam Gas Recovery Technologies field, in order to solve to pass through during goaf, three spudding well complicated construction techniques, and three drive a well body structure stability it is poor the problem of, the invention provides a kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, spudded in using three into construction technology, the well bore of coal bed gas well is spudded in hole and surface pipe by one, two spud in hole and protective casing, three spud in hole composition, three when opening drilling construction, pass through many node grouting and reinforcings of Sidewall Surrounding Rock progress outside protective casing, increase the intensity of Sidewall Surrounding Rock, ensure the steady in a long-term of coal bed gas well, and by production casing of the firm protective casing directly as coal bed gas well.The present invention wraps up support structure by forming the cement mortar of many nodes between protective casing and Sidewall Surrounding Rock, can greatly enhance coal bed gas well Sidewall Surrounding Rock and the long-time stability of casing programme.
Description
Technical field
The invention belongs to Coal-seam Gas Recovery Technologies field, and in particular to a kind of Sidewall Surrounding Rock for coal bed gas well reinforces note
Slurry crosses the intensive grouting and reinforcing coal bed gas well cementing method of many nodes in goaf with cementing operation.
Background technology
It is special because the service life of coal bed gas well is longer, it is necessary to keep the stability and security of recovery well within service life
, can be to coal bed gas well by the residual deformation and the disturbing influence in new exploiting field in old goaf when not being that coal bed gas well passes through goaf
Cause to damage or destroy.In engineering practice, frequently with method of controlling be that multilayer sleeve is nested and grouting and reinforcing, to realize coal
The cementing operation of layer gas well.For example, certain typical coal bed gas well, casing programme and its work progress when passing through goaf are：（1）
One opens D425 drill bit perforate, pierces basement rock 10m finishing drillings, and tripping in D377 surface pipe prevents Quaternary Period unconsolidated formation from caving in；
（2）Two exploitations are drilled into 20m finishing drillings below the seat earth of goaf with D311.15 drill bits, and tripping in D244.5 protective casing is used
Cement mortar sealing sleeve pipe base opening, and it is returned to goaf seat earth, Hou Ning；（3）Three exploitations are crept into D215.9 drill bits, extremely
Lower floor treats working seam bottom plate certain depth finishing drilling, and tripping in D139.7 production casing, from ttom of pipe mud jacking, makes production casing and skill
Cement mortar returns to earth's surface in art sleeve pipe, terminates.
The technical problem underlying run into Practical Project is：
（1）Current construction method, is only reinforced in well head and shaft bottom, it is impossible to realize drilling well central region and country rock plus
Gu it is closely connected, there is no any supporting construction between protective casing and Sidewall Surrounding Rock, coal bed gas well Sidewall Surrounding Rock and casing programme
Long-time stability are not enough.
（2）Disturbed by goaf, superstratum is very broken, there is caving zone and fissure zone.In drilling process, if
Slip casing by pressure is carried out, a large amount of leakages of injection slurry often occurs, and can not judge and detect grouting and reinforcing region and quality.Especially exist
Caving zone, if being reinforced to drilling well side wall grouting, flow direction, scope and the quality of injection slurry are difficult to control to.
（3）The a large amount of sleeve pipes of tripping in drilling process, construction technology is more complicated, and construction cost is high.Reduced in fragmented rock body
Sleeve pipe consumption, is to improve efficiency of construction, reduce the important channel of cost.
The content of the invention
The present invention is in order to solve to pass through during goaf, three spudding well complicated construction techniques, and three drive a well body structure stability
Poor the problem of, and then there is provided a kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf.
The present invention is adopted the following technical scheme that：
A kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, spuds in into construction technology using three,
The well bore of coal bed gas well is made up of spud in hole and protective casing, three holes of spudding in of hole and surface pipe, two of spudding in, and three spud in into applying
In man-hour, by many node grouting and reinforcings of Sidewall Surrounding Rock progress outside protective casing, increase the intensity of Sidewall Surrounding Rock, ensure coal bed gas
Well it is steady in a long-term, and by production casing of the firm protective casing directly as coal bed gas well；Many node slip casting positions include：
The perfusion of interior sleeve shell material, the perfusion of outer shell material and the reinforcing of fore shaft steel firmware in coal bed gas well aperture；
Two hole on bottom slip casting nodes of well bore；
Several pipe skirt slip casting nodes of fissure zone and caving zone in the middle part of well bore.
The pipe skirt slip casting node is that protective casing and two are spudded in using pipe skirt technology to carry out slip casting between the Sidewall Surrounding Rock of hole
Cement mortar formed by reinforcing wraps up support structure, and the pipe skirt technology refers to by the predetermined slip casting section in protective casing
Injected hole, sleeve valve and pipe skirt are set, drilling well side wall grouting reinforced using segmenting slip casting.
Specific cementing operation technique is as follows：
1）Spudded in a perforate using one, through Quaternary loose soils, be drilled into 10-20m finishing drillings one in basement rock flexure band and spud in hole；
2）Surface pipe retaining wall, spuds in hole one, and tripping in surface pipe to bottom hole prepares outer layer sleeve shell material, from aperture top layer
Sleeve pipe is poured into the interporal lacuna that spuds in, and it is solidifying to fill up time, fixed surface pipe；
3）The protective casing with pipe skirt is got out, the protective casing of pipe skirt section position is provided with injected hole, the skill at injected hole
Art outside of sleeve sets sleeve valve；Using two spud in head drilling, pass through basement rock flexure band, fissure zone, caving zone；Run into broken basement rock
When, tripping in protective casing pipe-following drilling is drilled into the zone of influence below the seat earth of goaf weaker layer, finishing drilling；On protective casing
Pipe skirt multiple spot be distributed in fissure zone and caving zone；
4）Protective casing bottom is cemented the well, and using cement mortar sealing protective casing base opening, cement mortar is returned to goaf by mud jacking
Seat earth is with gob caving band, forming two hole on bottom slip casting nodes, Hou Ning；
5）Cemented the well at the top of protective casing, at aperture position, between surface pipe and protective casing, filling internal layer sleeve shell material to hole
Mouthful, and surface pipe and protective casing are welded or be hinged using fore shaft steel firmware, form firm well head；
6）Cement the well in the middle part of protective casing, at the pipe skirt slip casting node position of foot, tripping in slurry casting machine, first high pressure injected clear water,
To open sleeve valve grouting hole, then high-pressure injected water mud, pipe skirt is gradually filled with injection slurry bulging and seeped water, and maintains 3-5min, pressure
Terminate slip casting when power substantially rises；
7）Slurry casting machine is moved along protective casing to aperture direction, the 2nd predetermined pipe skirt slip casting node is searched, repeats 6）Step
Slip casting process, until whole pipe skirt slip casting node slip castings are completed, forms many node slip casting inclusion enclaves, makes protective casing close with the borehole wall
Patch, completes middle part and cements the well, slurry casting machine is extracted outside protective casing, injecting cement paste is waited solidifying；
8）After slip casting inclusion enclave intensity meets and required, spudded in head drilling using three, treat that working seam bottom plate is default deep to lower floor
Degree, finishing drilling.
Pipe skirt on the protective casing sets 2-4 points along course of the hole.
The pipe skirt is by burlap or geosynthetics with water penetration（With reference to Xu Chaozhu《Geosynthetics》
Book）The square material being fabricated to, square material loop technique sleeve pipe at least one week is set, square material top by buckle on pipe skirt prick ring and
Protective casing connection, button and it is connected to be formed with protective casing by buckleing bundle ring under pipe skirt and wraps in protective casing in square material bottom
The skirt slip casting area of surrounding, constraint range of grouting.
The square material length（That is drilling depth direction）Not less than 1.5 times of pipe skirt slip casting node length, pipe skirt width
Spudded in not less than two 2 times of hole girth.
The sleeve valve is formed by colligation elasticity preferably rubber thin skin band on the outside of the protective casing at injected hole.Sleeve
Valve be can only to outside pipe pulp, it is impossible to the unidirectional closing device of slurry is returned into pipe.
Using segmentation high-pressure plaster-spraying implement during slip casting, the segmentation high-pressure plaster-spraying implement includes body, and the body is three section one
Body formula structure, the middle part of body is the floral tube for being provided with some slip casting grooves, and the upper and lower part of body is respectively screw thread, upper and lower part
Stop grouting plug combination is separately installed with screw thread, the segment between the combination of upper and lower part stop grouting plug is slip casting section, wherein, top is stopped
Slurry plug combination can be moved up and down along slurry casting machine top screw thread；The top of the top slurry casting machine top screw thread is provided with for coordinating
The latching connector of jointed rod, Grouting Pipe.
The stop grouting plug combination includes grip bolt, rubber seal and Elastic flexible glue ring, and grip bolt coordinates with screw thread
Connection, rubber seal and Elastic flexible glue ring are parallel to each other, are coaxially close to be socketed between grip bolt and sleeve pipe, form double-deck
Structure is only starched in sealing.The rubber seal is on the outside of Elastic flexible glue ring.Combined for the stop grouting plug on top, Elastic flexible glue
Ring is installed on below rubber seal, and is combined for the stop grouting plug of bottom, and Elastic flexible glue ring is installed on above rubber seal,
Therefore, inner side is relative injection slurry description, and the first layer that Elastic flexible glue ring is constituted with injection slurry is directly contacted is sealed, rubber seal
Circle constitutes second layer sealing.
The length of the slip casting section is 0.5-1m.
The slip casting groove is the rectangle notch of parallel tubes axis direction, is set along body axis direction and is no less than three
Layer, every layer of no less than 3 notch, the notch of adjacent layer is shifted to install.Ensure that pulp is uniform in slip casting section.
The present invention has the advantages that：
（a）Realize fissure zone and inbreak region in the middle part of drilling well and carry out slip casing by pressure, make protective casing closely connected with country rock,
The cement mortar parcel support structure of many nodes is formed between protective casing and Sidewall Surrounding Rock, the coal bed gas well borehole wall can be greatly enhanced and enclosed
The long-time stability of rock and casing programme；（b）Pass through the predetermined position in protective casing（Slip casting section）Injected hole, sleeve valve are set
With pipe skirt, drilling well side wall grouting is realized using segmenting slip casting device and reinforced, the presence of pipe skirt has ensured the flow direction of injection slurry, slip casting
Scope, significantly improves grouting quality and its controllability；（c）Using protective casing as final production casing, sleeve pipe is saved
Consumption.Meanwhile, the firm point of protective casing includes the slip casting inclusion enclave of well head, shaft bottom and multiple nodes, embodies drilling well slip casting
Cementing operation it is intensive, optimize working procedure, improve quality.
Meanwhile, it can solve following technical problem using high-pressure plaster-spraying implement is segmented：
（a）Realize that segmentation carries out sleeve pipe and well wall clearance grouting in sleeve pipe, and slip casting segment length may be selected；
（b）Double-deck grouting stop-valve is set, high pressure slip casting is realized；
（c）Separate high pressure Grouting Pipe is set, common exploration drilling rod can be used to be connected with slurry casting machine, simplify slip casting equipment.
Therefore, grouting and reinforcing outside the sleeve pipe of coal bed gas well is carried out using the grouting device, can be in specified drilling well inner region
Section or position, realize the high-pressure slip-casting of variable section length, Sidewall Surrounding Rock outside the sleeve pipe of designated area reinforced, sleeve pipe and
The borehole wall is closely connected, greatly strengthen the stability of coal bed gas well.
Brief description of the drawings
Fig. 1 is well cementation profile；
Fig. 2 is pipe skirt slip casting node drawing；
Fig. 3 is the structural representation of segmentation high-pressure plaster-spraying implement；
In figure：1. the 4th is；2. basement rock flexure band；3. fissure zone；4. caving zone；5. superjacent；6. seat earth；7. bottom
Coal seam；8. aperture；9. fore shaft steel firmware；10. one spuds in hole；11. surface pipe；12. outer layer sleeve shell material；13. protective casing；
14. internal layer sleeve shell material；15. bedrock surface；16. two spud in hole；17. pipe skirt slip casting node；18. two hole on bottom slip casting nodes；19. three
Spud in hole；20. bundle ring is buckled on pipe skirt；21. injected hole；22. bundle ring is buckled under pipe skirt；23. pipe skirt；24. Grouting Pipe；
31. drilling rod；32. Grouting Pipe；33. sleeve pipe；34. latching connector；35. slurry casting machine top screw thread；36. grip bolt；37. rubber
Sealing ring；38. Elastic flexible glue ring；39. slip casting groove；40. slurry casting machine bottom screw thread；41. body.
Embodiment
Shanxi Jincheng Anthracite Mining Industry Group Co., Ltd.'s coal is with coal bed gas Gong Cai National Key Laboratories by dividing
Analysis is current three to drive a well problem present in the deficiency and its work progress of casing programme, and then proposes many nodal sets in goaf
The cementing method of reduction grouting and reinforcing coal bed gas well, this method mainly uses pipe skirt technology, and two spud in hole 16 and protective casing 13
Between form the slip casting inclusion enclaves of many nodes（Reinforcing body）, the intensity of Sidewall Surrounding Rock is not only increased, while also making protective casing 13
There is the firm support of good coupling between the borehole wall, the steady in a long-term of coal bed gas well can be ensured.Meanwhile, formed in three holes 19 of spudding in
Afterwards, production casing is no longer installed, directly using firm protective casing 13 as coal bed gas well production casing.With regard to this, realize
Optimized construction procedure, improve efficiency, reduce the purpose of cost, embodying the intensive theory of coal bed gas well shaft building.
Technical key point is：
（1）Spudded in for the well bore of coal bed gas well by the hole 16+ protective casings 13, three that spud in of hole 10+ surface pipes 11, two that spud in
The situation that hole 19 is constituted.To strengthen the steady in a long-term of coal bed gas well and reducing cost, one of the key technology of the present invention is employed,
Many node grouting and reinforcings are carried out in the outer Sidewall Surrounding Rock of protective casing 13, final production casing is used as with protective casing 13.Its
Many node slip casting positions, including：1. the interior sleeve shell material 14 in aperture 8 irrigate, outer shell material 12 irrigate and fore shaft steel firmware 9 plus
Gu；2. two hole on bottom slip casting node 18；3. in the middle part of well bore fissure zone 3 and caving zone 4 multiple pipe skirt slip casting nodes 17.
（2）The depth at the position of pipe skirt slip casting node 17 of fissure zone 3 and caving zone 4 in the middle part of well bore, is noted using pipe skirt
Slurry technology carries out protective casing 13 and two and spudded in grouting and reinforcing between the borehole wall of hole 16, and the setting of pipe skirt 23 ensure that the stream of injection slurry
To, range of grouting, grouting quality and its controllability are significantly improved.Wherein, pipe skirt 23 by possess the burlap of certain water penetration or
Geosynthetics makes squarely, and length is 1.5 times of slip casting segment length, and width is two to spud in 2 times of the girth of hole 16, is wrapped
Around protective casing 13, the skirt slip casting area of constraint range of grouting is formed.Accordingly, injection slurry can be avoided to miss or running pulp, it is fast
Speed forms the body of wrapping of protective casing 13, after injection slurry condenses, and makes sleeve pipe and the two hole boreholes wall that spud in closely connected, has ensured protective casing
Steadiness, can be realized intensive by protective casing directly as production casing.
The specific implementation process of the present invention is as follows：
1）Spudded in a perforate using one, be 1 unconsolidated formation through the 4th, be drilled into about 10-20m finishing drillings in basement rock flexure band 2.
2）The retaining wall of surface pipe 11, spuds in hole 10 one, and tripping in surface pipe 11 to bottom hole prepares outer layer sleeve shell material
12, poured into from aperture surface pipe 11 with a gap of hole 10 of spudding in, it is solidifying to fill up time, fixed surface pipe 11.
3）The protective casing 13 with pipe skirt 23 is got out, the protective casing 13 at the position of pipe skirt 23 is provided with injected hole 21,
Outside of sleeve colligation elasticity preferably rubber thin skin band formation sleeve valve.Using two spud in head drilling, pass through basement rock flexure band 2, split
Gap band 3, caving zone 4.When running into broken basement rock, the pipe-following drilling of tripping in protective casing 13 is drilled into goaf seat earth shadow below 6
Ring area weaker floor, finishing drilling.The multiple spot of pipe skirt 23 on protective casing 13（General 2-4 points）It is distributed in fissure zone and caving zone.
4）The bottom of protective casing 13 is cemented the well, and in protective casing bottom, using cement mortar sealing sleeve pipe base opening, is made by mud jacking
Cement mortar returns to goaf seat earth 6 with gob caving band 4, forming two hole on bottom slip casting nodes 18, Hou Ning.
5）The top of protective casing 13 is cemented the well, at the position of aperture 8, between surface pipe 11 and protective casing 13, fills internal layer
Surface pipe 11 and protective casing 13 are welded or are hinged to aperture, and using fore shaft steel firmware 9 by sleeve shell material 14, form firm
Well head.
6）The middle part of protective casing 13 is cemented the well, at the position of pipe skirt slip casting node 17 of foot, tripping in slurry casting machine 24, first high pressure
Injected clear water, to open sleeve valve grouting hole, then high-pressure injected water mud, pipe skirt 23 is gradually filled with injection slurry bulging and seeped water, dimension
3-5min is held, can be terminated when pressure substantially rises.
7）Slurry casting machine 24 is moved along protective casing 13 to the direction of aperture 8, the 2nd predetermined pipe skirt slip casting node 17 is searched,
Repeat（6）The slip casting process of step, until being fully completed, forms many node slip casting inclusion enclaves, makes protective casing 13 and the borehole wall close
Patch, completes middle part and cements the well, slurry casting machine 24 is extracted outside protective casing 13, injecting cement paste is waited solidifying.
8）After slip casting inclusion enclave intensity meet require after, using three spud in head drilling, treat that the bottom plate of working seam 7 is pre- to lower floor
If depth, finishing drilling.
Crucial connecting portion in work progress is as follows：
Fill the bonding and reinforcement of outer layer sleeve shell material 12 at the position of aperture 8, between surface pipe 11 and Quaternary Strata, surface pipe 11 with
The top of protective casing 13 is welded or is hinged using fore shaft steel firmware 9, and internal layer sleeve shell material 14 is filled between sleeve pipe and is bonded.It is described outer
Layer sleeve shell material, internal layer sleeve shell material are to be formed by cement, soil, water by 1: 1.5: 1.80 mixed preparing respectively.
Pipe skirt 23 and protective casing 13 are pricked ring 22 and are bound in around tube wall by buckleing to prick buckle under ring 20 and pipe skirt on pipe skirt.
The position of injected hole 21 of protective casing 13, outside of sleeve colligation elasticity preferably rubber thin skin band formation sleeve valve.Slurry casting machine 24 exists
It is closely connected by double-deck grouting stop-valve and internal surface of sleeve pipe in protective casing 13, and moved up and down in pipe by drilling rod drive.
Spudded in the bottom hole of hole 16 two, protective casing 13 and two is bonded between opening borehole wall using cement mortar, part of cement slurry
It is pressed into seat earth 6 and caving zone 4, forms cement mortar anchoring body.
Using segmentation high-pressure plaster-spraying implement as shown in Figure 3 during slip casting, the body point upper, middle and lower three of segmentation high-pressure plaster-spraying implement
Point, top is length 0.1-0.5m slurry casting machine top screw thread, and middle part is the floral tube part for being provided with 3 pairs of slip casting grooves, length 0.5m
Left and right, bottom is the slurry casting machine bottom screw thread of 0.2m length.It is respectively mounted at slurry casting machine top screw thread and slurry casting machine bottom screw thread
Stop grouting plug is combined（Including three grip bolts, rubber seal and Elastic flexible glue ring）.Top stop grouting plug combination can be along slurry casting machine
Top screw thread movement, so as to realize that segmentation carries out sleeve pipe and well wall clearance grouting in sleeve pipe, and may be selected slip casting segment length, typically
Select length range 0.5-1.0m.Rubber seal and Elastic flexible glue ring are set in stop grouting plug combination, the work for possessing double-deck only slurry
With under grouting pressure effect, Elastic flexible glue ring is squeezed closely connected with sleeve pipe, significantly improves and only starches performance, realizes high pressure
Power slip casting.
Common exploratory drilling can may be selected with jointed rod, Grouting Pipe and slurry casting machine top screw thread, drilling rod in special latching connector
Bar, Grouting Pipe uses high-pressure slip-casting pipe, improves the flexibility of equipment and materials selection, reduces cost.
The use flow for being segmented high-pressure plaster-spraying implement is as follows：
（1）The slurry casting machine body of suitable diameter is selected, respective accessory, including drilling rod, Grouting Pipe, latching connector, clamping spiral shell is got out
Bolt, rubber seal, Elastic flexible glue ring etc..
（2）The stop grouting plug of bottom is combined（Including three grip bolts, rubber seal and Elastic flexible glue ring）Revolve successively
It is screwed on the screw thread of slurry casting machine bottom.
（3）The stop grouting plug on top is combined（Including three grip bolts, rubber seal and Elastic flexible glue ring）Revolve successively
It is screwed on the screw thread of slurry casting machine top, and the length of regulation slip casting section as needed, stop grouting plug combination is parked in some fixed position.
（4）Send first segment drilling rod and corresponding Grouting Pipe and latching connector screwed connection, and by slurry casting machine lifting into sleeve pipe
In.
（5）As stated above, continued drilling rod and Grouting Pipe successively, and the position of slip casting is needed in through sleeve pipe.
（6）In collar piping mouthful, from Grouting Pipe high pressure injected clear water, water under high pressure enters in slurry casting machine, and extruding elasticity is soft
Glue ring, makes it closely connected with tube wall, while the injected hole on sleeve pipe is broken.
（7）In ground well head, deployed injection slurry injects slurries from Grouting Pipe high pressure, and slurries are pressed into from sleeve pipe injected hole
Sleeve pipe is with borehole wall space, realizing segmenting slip casting reinforcing.
（8）Slip casting requirement is reached, timely hoisting grouting device to the mouth of pipe rinses slurry casting machine.
The connection main points and relation for being segmented high-pressure plaster-spraying implement are as follows：
Drilling rod and Grouting Pipe are connected by latching connector, latching connector and top slurry casting machine screwed connection.The stop grouting plug on slurry casting machine top
Combination includes grip bolt（3）, rubber seal and Elastic flexible glue ring, with inner ring, in inner ring in external threading, pass sequentially through
Slurry casting machine upper one end, is screwed to fixed position along slurry casting machine top screw thread.Rubber seal and Elastic flexible glue ring are pressed from both sides
Hold bolt clamping.Equally, the stop grouting plug combination of slurry casting machine bottom includes grip bolt（3）, rubber seal and Elastic flexible glue
Ring, with inner ring, in inner ring in external threading, pass sequentially through slurry casting machine bottom screw thread, screw to fixed position.Rubber seal and
Elastic flexible glue ring is clamped by three grip bolts.Stop grouting plug combination is closely connected with sleeve pipe up and down.
Claims (10)
1. a kind of cementing method for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, drilling construction work is opened using three
Skill, the well bore of coal bed gas well is spudded in hole by one（10）With surface pipe（11）, two spud in hole（16）With protective casing（13）, three open
Drilling（19）Composition, it is characterised in that by protective casing（13）Outer Sidewall Surrounding Rock carries out many node grouting and reinforcings, increases well
The intensity of wall country rock, ensures the steady in a long-term of coal bed gas well, and the protective casing that will be consolidated（13）Directly as coal bed gas well
Production casing；Many node slip casting positions include：
Coal bed gas well aperture（8）Interior sleeve shell material（14）Perfusion, outer shell material（12）Perfusion and fore shaft steel firmware（9）Plus
Gu；
Two hole on bottom slip casting nodes of well bore（18）；
Fissure zone in the middle part of well bore（3）And caving zone（4）Several pipe skirt slip casting nodes（17）.
2. the cementing method according to claim 1 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：The pipe skirt slip casting node（17）It is to protective casing using pipe skirt technology（13）Spudded in hole with two（16）Sidewall Surrounding Rock
Between carry out cement mortar parcel support structure formed by grouting and reinforcing, the pipe skirt technology refers to by protective casing（13）
Predetermined slip casting section injected hole, sleeve valve and pipe skirt are set, drilling well side wall grouting is reinforced using segmenting slip casting.
3. the cementing method according to claim 2 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be, specific cementing operation technique is as follows：
1）Spudded in a perforate using one, be through the 4th（1）Unconsolidated formation, is drilled into basement rock flexure band（2）Interior 10-20m finishing drillings one are opened
Drilling（10）；
2）Surface pipe（11）Retaining wall, spuds in hole one（10）In, tripping in surface pipe（11）To bottom hole, prepare outer layer sleeve shell material
（12）, from aperture surface pipe（11）Spudded in hole with one（10）Gap is poured into, and is filled up time and is coagulated, fixed surface pipe（11）；
3）It is ready to carry pipe skirt（23）Protective casing（13）, pipe skirt（23）The protective casing at position（13）It is provided with injected hole
（21）, in injected hole（21）The protective casing at place（13）Outside sets sleeve valve；Using two spud in head drilling, pass through basement rock flexure band
（2）, fissure zone（3）, caving zone（4）；When running into broken basement rock, tripping in protective casing（13）Pipe-following drilling, is drilled into goaf coal
Layer bottom plate（6）The following zone of influence weaker layer, finishing drilling；Protective casing（13）On pipe skirt（23）Multiple spot is distributed in fissure zone and emitted
Fall in band；
4）Protective casing（13）Bottom is cemented the well, using cement mortar sealing protective casing（13）Base opening, cement mortar is returned by mud jacking
To goaf seat earth（6）With gob caving band（4）In, form two hole on bottom slip casting nodes（18）, Hou Ning；
5）Protective casing（13）Top is cemented the well, in aperture（8）Position, in surface pipe（11）And protective casing（13）Between, filling
Internal layer sleeve shell material（14）To aperture, and use fore shaft steel firmware（9）By surface pipe（11）And protective casing（13）Welding or
It is hinged, forms firm well head；
6）Protective casing（13）Middle part is cemented the well, in the pipe skirt slip casting node of foot（17）Position, tripping in slurry casting machine（24）, it is first high
Injected clear water is pressed, to open sleeve valve grouting hole（21）, then high-pressure injected water mud, pipe skirt（23）It is gradually filled with injection slurry bulging simultaneously
Infiltration, maintains 3-5min, terminates slip casting；
7）Along protective casing（13）To aperture（8）Move slurry casting machine in direction（24）, search the 2nd predetermined pipe skirt slip casting node
（17）, repeat 6）The slip casting process of step, until whole pipe skirt slip casting nodes（17）Slip casting is completed, and forms many node slip casting parcels
Body, makes protective casing（13）It is closely connected with the borehole wall, complete middle part and cement the well, by slurry casting machine（24）Extract protective casing（13）Outside, slip casting
Body is waited solidifying；
8）After slip casting inclusion enclave intensity meet require after, using three spud in head drilling, treat working seam to lower floor（7）Bottom plate is preset
Depth, finishing drilling.
4. the cementing method according to claim 3 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：The protective casing（13）On pipe skirt（23）Along course of the hole, 2-4 points are set.
5. the cementing method according to claim 4 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：The pipe skirt（23）It is the square material being fabricated to by burlap or geosynthetics with water penetration, square material ring
Around protective casing（13）Set within least one week, ring is pricked in square material top by being buckled on pipe skirt（20）With protective casing（13）Connection,
Detained in square material bottom and prick ring by being buckled under pipe skirt（22）With protective casing（13）Connection formation is wrapped in protective casing（13）
The skirt slip casting area of surrounding, constraint range of grouting.
6. the cementing method according to claim 5 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：The square material length is not less than pipe skirt slip casting node（17）1.5 times of length, pipe skirt（23）Width is opened not less than two
Drilling（16）2 times of girth.
7. the cementing method according to claim 6 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：The sleeve valve is by injected hole（21）The protective casing at place（13）Outside colligation elasticity preferably rubber thin skin band
Formed.
8. the cementing method according to claim 7 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：Using segmentation high-pressure plaster-spraying implement during slip casting, the segmentation high-pressure plaster-spraying implement includes body（41）, the body（41）For
Three-segment integral structure, body（41）Middle part to be provided with some slip casting grooves（39）Floral tube, body（41）Upper and lower part
Stop grouting plug combination is separately installed with respectively screw thread, upper and lower part screw thread, the segment between the combination of upper and lower part stop grouting plug is
Slip casting section, wherein, stop grouting plug combination in top can be moved up and down along slurry casting machine top screw thread；The top slurry casting machine top screw thread
Top is provided with for the drilling rod that is connected（31）, Grouting Pipe（32）Latching connector（34）.
9. the cementing method according to claim 8 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：The stop grouting plug combination includes grip bolt（36）, rubber seal（37）With Elastic flexible glue ring（38）, grip bolt
（36）It is connected with screw thread, rubber seal（37）With Elastic flexible glue ring（38）It is parallel to each other, is coaxially close to be socketed on clamping
Bolt（36）With sleeve pipe（33）Between, form double-layer seal and stop slurry structure；The rubber seal（37）Located at Elastic flexible glue ring
（38）Outside.
10. the cementing method according to claim 9 for crossing the intensive grouting and reinforcing coal bed gas well of many nodes in goaf, it is special
Levy and be：The length of the slip casting section is 0.5-1m.
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| CN108222882A (en) * | 2018-01-25 | 2018-06-29 | 安徽省煤田地质局第勘探队 | Inwash individual well multi-section multi-layer slip casting new casing and construction method |
| CN109989726A (en) * | 2018-11-22 | 2019-07-09 | 上海中煤物探测量有限公司 | Cellular-type underground, which pinpoints syringe and its applies, is repairing the method in water supply well |
| CN110714737A (en) * | 2019-11-09 | 2020-01-21 | 中为(上海)能源技术有限公司 | Well cementation system and method for coal underground 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 |
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| CN109989726A (en) * | 2018-11-22 | 2019-07-09 | 上海中煤物探测量有限公司 | Cellular-type underground, which pinpoints syringe and its applies, is repairing the method in water supply well |
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| CN111750551A (en) * | 2020-06-24 | 2020-10-09 | 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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