CN107217987A - Colliery flood administers well boring method - Google Patents
Colliery flood administers well boring method Download PDFInfo
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- CN107217987A CN107217987A CN201710388710.XA CN201710388710A CN107217987A CN 107217987 A CN107217987 A CN 107217987A CN 201710388710 A CN201710388710 A CN 201710388710A CN 107217987 A CN107217987 A CN 107217987A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims abstract description 23
- 238000005516 engineering process Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 238000007569 slipcasting Methods 0.000 claims description 68
- 239000002002 slurry Substances 0.000 claims description 58
- 239000004568 cement Substances 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 16
- 239000011440 grout Substances 0.000 claims description 10
- 239000004927 clay Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 239000002956 ash Substances 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 4
- 230000002706 hydrostatic effect Effects 0.000 claims description 4
- 235000010891 Ptelea trifoliata Nutrition 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000003469 silicate cement Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 241000537371 Fraxinus caroliniana Species 0.000 claims 1
- 239000010883 coal ash Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 description 10
- 210000002966 serum Anatomy 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
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- 238000013461 design Methods 0.000 description 3
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- 244000097592 Ptelea trifoliata Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
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- 230000013872 defecation Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
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- 231100000252 nontoxic Toxicity 0.000 description 1
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Classifications
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Well boring method, step one are administered the invention discloses a kind of colliery flood：Drive a well eye to straight well section and casing cementing；Step 2：Open lateral well head and casing cementing；Step 3：Multi-branched horizontal well construction is carried out in lateral well head；Step 4：During generation leakage, from well to lateral well sleeve opening grouting for water plugging；Step 5：Multiple-limb level is after the completion of formula well all construction, to the following Open-Hole Section cementing plug sealing of overshoes；Step 6：Carry out casing-pipe cutting and act cut point above sleeve pipe, step 7：To it is more than former technology overshoes, the following well section cementing plug sealing of side tracking point；Step 8：Carry out next lateral well head construction and setting of casing well cementation；Step 9：Repeat step two completes casing-pipe cutting, the grouting for water plugging of multi-branched horizontal well one by one to step 8.The beneficial effects of the invention are as follows：Realize and bore the horizontal cluster well of multiple-limb, reduce land use, shorten construction period, save drilling well integrated cost；With safe and accurate property.
Description
Technical field
The present invention relates to anti-multi-branched horizontal well drilling technology field of harnessing the river, more particularly to a kind of colliery flood is administered well and bored
Well method.
Background technology
Coal mine flood is common a kind of disaster in Mine Production, when referring to mine in tunnel, digs Durchgangshohle
Wall connects the discarded tunnel of underground water or ponding, and the progress and quality of influence mine engineering construction deteriorate the building ring of workman
Border, unsafe factor is brought to coal production, serious to flood well accident, causes the heavy losses of life and property.Preventing and treating
Water is a very important job in coal production operation, in existing construction, using sleeve technology, under skill set is general extremely
10 meters below coal seam floor, usually collapsed in drilling and cleaning bottom of hole, it is lower to lower 4 meters of ash difficult to understand when changing skill set, it can seal
Portion easily caves in well section, but due under sleeve pipe it is deep, it is impossible to carry out the construction of other horizontal branch again.
The content of the invention
The technical problems to be solved by the invention are to provide one kind in the more than two multiple-limb levels of a wellsite applications
Well and directional well, using sleeve technology is cut, reuse the top well section of a bite well, the kickoff point (KOP) position different by changing,
Realize and bore the horizontal cluster well of multiple-limb；Simultaneously when severe leakage occurs in the Ordovician limestone drilling of horizontal segment, using dilute slurry
Slip casting is carried out on ground with thick slurry liquid dual density injection slurry, slurries are reinforced to water-bearing layer.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of colliery flood administers well drilling well side
Method, step one：Eye drive a well to straight well section, i.e., one opens, the layer casing cementing in well；Step 2：Enter in straight well pars infrasegmentalis
The lateral well head construction of row, i.e., two open main branch, and lower intermediate casing cementing；Step 3：Multiple-limb water is carried out in lateral well head bottom
Flat is three to open from formula well construction；Step 4：When occurring leakage in multi-branched horizontal well work progress, from ground well to lateral
Casing mouthful grouting for water plugging；Step 5：It is right when the multiple-limb level of a sidetracking well head bottom is after the completion of formula well all construction
The following Open-Hole Section cementing plug sealing of protective casing overshoes；Step 6：Casing-pipe cutting is carried out to protective casing and acts cut point
Above sleeve pipe, step 7：To it is more than former technology overshoes, the following well section cementing plug sealing of side tracking point；Step 8：From side tracking point side
The next lateral well head construction of drilling row, i.e., two open main branch, and lower intermediate casing cementing, and carry out one by one three open multiple-limb level from
The construction of formula well；Step 9：Repeat step two completes casing-pipe cutting, the grouting for water plugging of multi-branched horizontal well one by one to step 8.
The step 2, more than protective casing overshoes 300 meters of the effective cement sealing of set is sealed using caving-preventing drilling fluid
Ground to annular space cement plug face.
The casing-pipe cutting of the step 6 comprises the following steps：
1) prepare before tripping in hydraulic cutter：Hydraulic cutter all parts are checked comprehensively, ground experiment is carried out before entering well, are remembered
Discharge capacity, pump pressure are recorded, checks that turn on pump each wing working condition, termination of pumping are returned sword and situation and returns sword the time, and make a record；2) tripping in water
Power cutter Casing-Cutting：Well head is cleared up, by the cutter connected and drilling rod way-type drilling unit tripping in horizontal branch well, in cement plug plug
Cut at the cut sleeve position above 50m face position；3) cutting is finished, and acts instrument, and sleeve pipe is cut off in recurrence；4) repeat
Step 1) to 4), the casing-pipe cutting of multiple branch horizontal wells is carried out one by one.
Enter hydraulic cutter midway and forbid turn on pump；When arriving cutting position under drilling tool, with the slow rotation drilling tools of 5-10r/min, open
Pump is cut, and rotating speed gradually is increased into 20-30r/min, observation moment of torsion and pump pressure change, when moment of torsion reduction, pump pressure reduction, is rotated
When moment of torsion is not further added by, sleeve pipe is cut disconnected, now termination of pumping, trip-out.
The step 4, includes the selection of 1) injecting paste material from ground well to the method for side casing mouthful grouting for water plugging；
2) slurrying of neat slurry；3) grouting process；4) determination of grouting parameter.
The injecting paste material has neat slurry, clay slip, clay cement grout and clay ash cement slurry；The slip casting journey
Sequence is divided into segmenting slip casting or continuous grouting；The grouting parameter terminates including grouting pressure, slip casting discharge capacity, slip casting density and slip casting
Standard.
The injecting paste material is preferably single liquid cement mortar, and R325 slag silicate cement, water ash is matched as 3:1~1:1；Or adopt
Part flyash is used, cement and flyash press 1:1~1:3 proportionings.
The preferred well head of grouting process hangs filling formula continuous grouting pattern, including：1) clean-up line, 2) Grouting Pipe the examination of road
Pressure, 3) packer permeability test into hole, 4) slip casting, 5) water is replaced into hole；The packer permeability test into hole is used to be increased step by step by small pump amount
Maximum pump amount pressure water is added to, the small pump amount pressure water time is not less than 0.5 hour, and the maximum pump magnitude pressure water time is not less than 1 hour；Institute
State replace its total Water of water to be 1--1.5 from grouting pipeline total measurement (volume) to hole times.
The grouting pressure is made up of the pressure of grouting pump, slurries from gravity, the resistance of pipeline and hydrostatic pressure, preferably
High-pressure slip-casting pattern, slip casting end mark is that grouting pressure reaches 12MPa；The slip casting density selection cement slurry density exists
Between 1.15-1.30g/cm3；The slip casting ending standard：Slip casting termination pressure is 12MPa, and end pumpage is 200L/
Min, voltage stabilizing 30 minutes.
The hydraulic cutter body is followed successively by top connection, outer barrel, cutter head and bottom, the outer barrel provided with spray by upper under
Mouth), piston, back-moving spring and feed rod, the shank of the cutter head is connected with feed rod, and body is stretched out in the presence of piston；
The bottom is provided with wiper block.
The beneficial effects of the invention are as follows：By changing kickoff point (KOP) position, the purpose for boring the horizontal cluster well of multiple-limb is realized, is subtracted
Lack land use, shortened construction period, save drilling well integrated cost；Compared with conventional underground grouting, on ground by difference
The slurries of density have the advantages that safety, regulation effect are good, accuracy is high and depth is wider by the injection water-bearing layer that drills.
Brief description of the drawings
Fig. 1 is hydraulic cutter schematic diagram,
Fig. 2 is casing programme schematic diagram.
Wherein：
1st, surface pipe, 2, the first well 2 for completion of having constructed, second mouthful of well of hot work in progress
2-1, cement plug 2-2, the sleeve pipe cut off
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
The present invention is applied to the horizontal cluster well of multiple-limb.The main drilling technology being related in construction is to cut sleeve technology+ground
Face grouting for water plugging technology.According to preventing and treating water well drilling requirement, in the more than two multi-branched horizontal wells of wellsite applications and calmly
Xiang Jing, using sleeve technology is cut, reuses the top well section of a bite well, changes different kickoff point (KOP) positions, realize and bore many points
The purpose of Zhi Shuiping cluster wells；Simultaneously when severe leakage occurs in the pottery limestone drilling difficult to understand of horizontal segment, using dilute slurry and thick slurry
Liquid dual density grouting program, slip casting is carried out on ground, and slurries flow into water-bearing layer, with " maximum slip casting, maximum magnitude diffusion, most
Limits are filled " for the purpose of, water-bearing layer is reinforced and transformed, to reach anti-purpose of harnessing the river.
Colliery flood administers well boring method, step one：The eye that drives a well is opened to straight well Duan Weiyi, the layer sleeve pipe in well
Well cementation；Step 2：In the lateral well head of straight well pars infrasegmentalis progress main branch construction and lower intermediate casing cementing are opened for two；Step 3：
Lateral well head bottom carries out multiple-limb level and opens branch's construction from formula well for three；Step 4：In multi-branched horizontal well work progress
During middle generation leakage, from ground well to lateral well sleeve opening grouting for water plugging；Step 5：When many points of a sidetracking well head bottom
Zhi Shuiping is after the completion of formula well all construction, to the following Open-Hole Section cementing plug sealing of protective casing overshoes；Step 6：To technology
Sleeve pipe carries out casing-pipe cutting and acts cut point above sleeve pipe, step 7：To it is more than former technology overshoes, the following well section of side tracking point beats
Cement plug sealing；Step 8：It is two to open main branch construction and lower intermediate casing cementing to carry out next lateral well head from side tracking point sidetracking,
And progress three opens multiple-limb level from the construction of formula well one by one；Step 9：Repeat step two completes multiple-limb one by one to step 8
Casing-pipe cutting, the grouting for water plugging of horizontal well.
Embodiment
Implement to be divided into two stages as shown in Fig. 2 preventing and treating well cuts sleeve pipe technology：First stage setting of casing is cemented the well；
Second stage tripping in hydraulic cutter Casing-Cutting, acts sleeve pipe, cementing plug.By taking φ 177.8mm sleeve pipes as an example, specific implementation step
Suddenly it is：
(1) connecting tube string：Guide shoe and sleeve pipe
(2) tripping in pipe string；
(3) complete under sleeve pipe, circulation well cleanup adjusts mud property；
(4) 300 meters are injected more than caving-preventing drilling fluid, cement injection, a sealing overshoes；
(5) replace into the mud amount calculated, for slurry to overshoes, build the pressure Hou Ning；
(6) multi-branched horizontal well three is driven into after chi is fully completed, and cementing plug is from shaft bottom sealing to overshoes.
(7) performance of hydraulic cutter is checked comprehensively, it is ensured that tool performance of going into the well is good.
(8) well head is cleared up, hydraulic cutter instrument BHA is connected, well head experiment, record is pumped and returned sword the time.It is lower to bore
During forbid turn on pump circulating mud.Under drilling tool to design well depth, avoid casing collar location, hole deviation preferably at 5 ° or so, with
Rotating speed is gradually increased to 20-30r/min, observation moment of torsion and pump pressure change by the slow rotation drilling tools of 5-10r/min, turn on pump cutting,
When moment of torsion reduces, pump pressure is reduced, when driving torque is not further added by, illustrate that sleeve pipe is cut disconnected.Termination of pumping, pulls out of hole.Note when returning sword
Termination of pumping is waited for a period of time, and is pulled out of hole and is noted the suspending weight change of observation weight indicator, it is to avoid hanging sleeve pipe causes contingency, acts instrument,
Sleeve pipe is cut off in recurrence.
(9) tripping in polish drill rod, cementing plug waits solidifying, and cement plug plug face position is in cut sleeve position above 50m.
(10) treat that cement plug is waited to coagulate, lower directional orientation tool sidetracking, carry out the construction of lower a bite well.
Hydraulic cutter is described outer as shown in figure 1, body is followed successively by top connection 1, outer barrel 2, cutter head 3 and bottom 4 by upper under
Nozzle 2-1, piston 2-2, back-moving spring 2-3 and feed rod 2-4, shank and the feed rod 2-4 phases of the cutter head 3 are provided with cylinder 2
Even, piston 2-2 stretches out piston rod by the nozzle 2-1 power for erupting liquid, promotes feed rod 2-4 to move downward, feed rod 2-4
Cutter head 3 is ejected into body and carries out cutting work, nozzle 2-1 stops piston rod after hydrojet and shunk, and now, back-moving spring 2-3 is by knife
First 3 reset；The bottom 4 is provided with wiper block 4-1.
The former borehole surface grouting for water plugging technology of recycling
By the substantial amounts of injected hole of Reasonable Arrangement, the aqueous of safely mining of coalbed is threatened to direct by drilling on ground
The a large amount of cement injection slurries of layer, cement grout spreads along karst crack, condensed, fills crack, water therein is cemented out,
It is allowed to not aqueous or weak aqueous, changes the property of water-bearing in water-bearing layer.Slurries grouting pressure effect under, along limestone crushed zone to
Passage migration diffusion, the condensation of Ordovician karst water supply thin layer limestone, block or reduce conduit pipe, eliminate or reduce Ordovician karst water to thin
The increment of layer limestone.Slurries, by limestone along the migration diffusion of seat earth crack, condensation, fill under grouting pressure effect
Fill in water producing fractures, reinforcing strengthening bottom plate, the passage for blocking water-bearing layer receiving supply.
1. the selection of injecting paste material：
Injecting paste material is the important component of water-bearing layer grout transformation technology.Grout transformation be with " maximum slip casting, most
Long range diffusion, is filled to greatest extent " for the purpose of.Why slip casting can be reinforced and be transformed to water-bearing layer, be due to slip casting
Material enters the result for being changed into solid phase in the space in water-bearing layer from liquid phase by injected hole.Generally, if a kind of material
Slurries can be become and enter the material that can serve as water-bearing layer grout transformation consolidated again behind the space of water-bearing layer.To slip casting material
The basic demand of material is:
(1) slurries can be changed into solid-state from liquid；
(2) slurry viscosity is low, and fineness is high, and the property noted is good, and setting time is adjustable, can reach the diffusion of maximum magnitude；
(3) slurries calculus rate is high, and stability is good, and calculus long-term immersion in water is not undergone phase transition；
(4) slurries are nontoxic, odorless, and environment is not polluted, harmless；
(5) calculus anti-permeability performance is good, and plastic strength is higher, can not be extruded from Karst Fissures by hydraulic pressure；
(6) slurries are to grouting equipment, the corrosion-free effect of grouting pipeline, and easy cleaning；
(7) it is easy to draw materials, and convenient transportation is cheap；
(8) slurries manufacture and instillation process are simple, easily operation.
According to above-mentioned requirements, the material that grout transformation is used has single-phase and multiphase.It is single-phase have neat slurry,
Clay slip；Multiphase has clay cement grout and a clay ash cement slurry.
Hundreds of meters or even upper km can be spread in fracture azimuth slurries, and in non-fracture azimuth starching liquid-based
Originally it can not spread, therefore estimated slurries diffusion length to be difficult accurately, Fengfeng Mining Area grout spreading range is 10-20
Rice.
This project injecting paste material is single liquid cement mortar, R325 slag silicate cement.Water ash proportioning is 3:1~1:1, meet compared with
Slurries number of dropouts is big when large fracture or solution cavity, it is contemplated that use part flyash, and cement and flyash press 1:1~1:3 proportionings.If
When meeting karst collapse col umn, according to circumstances tailor grouting design.
2. the slurrying of neat slurry：
Slurrying uses cementing truck continuous slurrying technique, replaces interim slip casting station using cementing truck defecation tank, saves and build note
Starch the expense at station.Cementing truck slip casting, real-time to grouting parameter can monitor, accurately controls, grouting amount and upper pressure situation are supervised in real time
Survey, grouting program can be adjusted at any time according to wastage size, realize mix cement zero-emission, pollution-free, safety and environmental protection.Mainly
Equipment has auxiliary facility and the instruments such as cementing truck, cement Storage Tank, concrete grey tank car, achieves good slip casting effect.
3. grouting method and grouting process：
Segmenting slip casting is exactly several sections of slip castings of an injected hole point, typically takes downstriker.The condition of segmenting slip casting is：(1)
The water that drills is big, continues to creep into difficulty；(2) bored grouting section collapse hole is serious, it is difficult to continue to creep into.
Continuous grouting is exactly the slip casting of each injected hole, reaches the standard that slip casting terminates from slip casting is started, ceaselessly
Perfusion.Pump amount, pump pressure, serum density can be adjusted during this as required.This grouting method is water-bearing layer large area slip casting
Transform most common method.This method has the advantage that：(1) continuous grouting slurries diffusion length is remote, crack be filled with it is closely knit,
Grouting quality is good.(2) slip casting non-cutting time is few, and repeated workload is small, slip casting efficiency high.
Well head installs cementing head, hangs filling formula slip casting, advantage is need not to descend drilling tool, it is to avoid bit freezing risk, and saving is removed
The brill time, have the disadvantage the bad control in cement plug face.
Tripping in polish drill rod slip casting, advantage is can to control cement plug face, and reduction sweeps plug risk and sweeps the plug time, has the disadvantage card
Bore risk big.
What this project was taken is that well head hangs filling formula continuous grouting pattern, saves time and cost, reduces bit freezing risk.
Continous way grouting process is：
(1) clean-up line.
(2) grouting pipeline pressure testing.
(3) packer permeability test into hole.The purpose of pressure water is to understand drilling plasma volume, for selection grouting pump amount and serum density
Foundation is provided, dredging, extension fracture provide unimpeded crack passage for slip casting.Generally use and increased step by step by small pump amount
It is added to the method pressure water of maximum pump amount.Well head installs pressure gauge during pressure water, at any time the situation of change of observed pressure.Press the water time not
Less than 0.5 hour, the maximum pump magnitude pressure water time was not less than 1 hour., can be directly with maximum pump amount pressure if bore leaking amount is big
Water.
(4) slip casting.During slip casting, pump amount, pump pressure, serum density can be adjusted as needed.When reaching slip casting
During ending standard, stop slip casting, carry out next step construction.
(5) water is replaced into hole.To 1--1.5 times that the total Water of hole internal pressure water is grouting pipeline total measurement (volume).Slip casting operation is applied
Work terminates.
4. the determination of grouting parameter：
(1) grouting pressure
Grouting pressure is the external force for promoting slurries move, fill in injected hole and in formation fractures, being compacted.It is by noting
The pressure of stock pump, slurries from gravity, the resistance of pipeline, hydrostatic pressure composition.Grouting pressure effect is to promote slurries in crack
Middle diffusion, filling；Make dewatering slurries；Promote slurry consolidation；Can be with vee crack.
The determination of grouting pressure：Want comprehensive analysis range of scatter, set strength, bottom plate anti-pressure ability, water pressure, target zone
Maximum crustal stress of superstratum etc., is generally available following formula determination:
Pb=n (Plx+Pgx+Ps+Ph)<Kp
In formula:Pb:Termination pressure.
Plx:Slurries reach the loss pressure that design range of scatter spreads in crack.
Pgx:Slurries are in the operating loss pressure of pipeline.
Ps:Hydrostatic pressure.
Ph:The static pressure of slurries post.
Kp:The tensile strength of seat earth or the maximum crustal stress of target zone superstratum.
n:Adjustment factor, n >=1.
Generally, grouting pressure is 2-5 times of slip casting target zone (water-bearing layer) hydraulic pressure.This is current multiple mining areas
Usual accepted standard.
High-pressure slip-casting be grouting pressure more than 10MPa, and close to or up slip casting target zone superstratum maximally
Stress.The advantage of high-pressure slip-casting：It can increase grouting amount, improve grouting quality；The diffusion length of slurries can be increased, reduced
Slip casting hole number；The consolidating strength of slurries can be improved, it is more closely knit that fracture is filled；Extension crack that can be bigger, makes
Slurry is largely entered in some tiny do not enter originally slurry or the few cracks of grout absorption, and more coarse grained slurries can also enter tiny split
Seam；Crack and solution cavity that injected hole is not disclosed directly can be linked up；Can be with ground extruding stratum.
The selection of grouting pressure, is changed to from original slip casting termination pressure 10.0MPa：400L/min discharge capacity slip castings, pressure
Reach that termination pressure reaches 10.0MPa immediately for slurry after 8.0MPa, reached that final grouting pressure is not less than 10.0MPa requirement.From
Sweep and seen in plug effect, the later stage sweeps plug-like condition and taken an evident turn for the better, and later stage slip casting should be noted grouting pressure variation tendency, prevents pressure mistake
Height suppresses Lou stratum, causes cement plug in well excessively, to sweep plug difficult.
This project uses high-pressure slip-casting pattern, and slip casting end mark is that grouting pressure reaches 10MPa.
(2) slip casting discharge capacity.The size of slip casting discharge capacity is that, according to drilling water, drill plasma volume, and grouting pressure and pipeline are defeated
Slurry ability is determined.General drilling plasma volume is big, and pressure is small, with big pump amount, and plasma volume is small, and pressure is big, with small pump amount, single hole
All with small pump amount at the end of slip casting.Small pump amount run time can not be long, the easy blocking pipeline of overlong time.Big pump amount slip casting
Pump amount can not be too big, and too big boosting is fast, the time of slurries well into fine cracks needs.This project is according to slip casting
Pressure, discharge capacity is typically between 200--1200L/min.
(3) serum density.Serum density reflects content of the cement in slurries, and serum density is smaller, under the same terms
Diffusion is more remote.But the density of slurries is too small, the slip casting time is long, and slurry consolidation is slow, influences the progress and quality of slip casting.Therefore need
Rationally determine serum density.Determining the basic principle of serum density is：The plasma volume that drills is big, and first with dilute slurry, pressure, which reaches, to be connect
The standard that nearly slip casting terminates, uses thick slurry liquid instead.
This items selection cement slurry density is first low rear high between 1.15-1.30g/cm3, in favor of improving slip casting matter
Amount.
Slip casting ending standard：Slip casting termination pressure is 12MPa, and end pumpage is 200L/min, voltage stabilizing 30 minutes.
Claims (10)
1. a kind of colliery flood administers well boring method, step one：Eye drive a well to straight well section, layer sleeve pipe is consolidated in well
Well；Step 2：Lateral well head construction and lower intermediate casing cementing are carried out in straight well pars infrasegmentalis；Step 3：In lateral well head bottom
Multiple-limb level is carried out from formula well construction；Step 4：When occurring leakage in multi-branched horizontal well work progress, by ground well
To lateral well sleeve opening grouting for water plugging；Step 5：When the multiple-limb level of a sidetracking well head bottom has all been constructed from formula well
Cheng Hou, to the following Open-Hole Section cementing plug sealing of protective casing overshoes；Step 6：Casing-pipe cutting is carried out to protective casing and rises
Cut point above sleeve pipe, step 7：To it is more than former technology overshoes, the following well section cementing plug sealing of side tracking point；Step 8：From side
Bore point sidetracking and carry out next lateral well head construction and lower intermediate casing cementing, and carry out multiple-limb level applying from formula well one by one
Work；Step 9：Repeat step two completes casing-pipe cutting, the grouting for water plugging of multi-branched horizontal well one by one to step 8.
2. a kind of colliery flood according to claim 1 administers well boring method, it is characterized in that, the step 2, by skill
More than art sleeve pipe overshoes 300 meters of the effective cement sealing of set, ground is sealed to annular space cement plug face using caving-preventing drilling fluid.
3. a kind of colliery flood according to claim 1 or 2 administers well boring method, it is characterized in that, the step 6
Casing-pipe cutting comprises the following steps：
1) prepare before tripping in hydraulic cutter：Hydraulic cutter all parts are checked comprehensively, and ground experiment, record row are carried out before entering well
Amount, pump pressure, check that turn on pump each wing working condition, termination of pumping are returned sword and situation and return sword the time, and make a record；2) tripping in waterpower is cut
Knife Casing-Cutting：Well head is cleared up, by the cutter connected and drilling rod way-type drilling unit tripping in horizontal branch well, in cement plug plug face position
Put and cut at cut sleeve position above 50m；3) cutting is finished, and acts instrument, and sleeve pipe is cut off in recurrence；4) repeat step
1) to 4), the casing-pipe cutting of multiple branch horizontal wells is carried out one by one.
4. a kind of colliery flood according to claim 3 administers well boring method, it is characterized in that：Enter hydraulic cutter midway taboo
Only turn on pump；When arriving cutting position under drilling tool, with the slow rotation drilling tools of 5-10r/min, turn on pump cutting gradually increases to rotating speed
20-30r/min, observation moment of torsion and pump pressure change, when moment of torsion reduction, pump pressure reduction, when driving torque is not further added by, sleeve pipe is cut
Cut off, now termination of pumping, trip-out.
5. a kind of colliery flood according to claim 1 administers well boring method, it is characterized in that：The step 4, by ground
Face well includes the selection of 1) injecting paste material to the method for side casing mouthful grouting for water plugging；2) slurrying of neat slurry；3) slip casting
Program；4) determination of grouting parameter.
6. a kind of colliery flood according to claim 5 administers well boring method, it is characterized in that：The injecting paste material has pure
Cement mortar, clay slip, clay cement grout and clay ash cement slurry；The grouting process is divided into segmenting slip casting or continuous note
Slurry；The grouting parameter includes grouting pressure, slip casting discharge capacity, slip casting density and slip casting ending standard.
7. a kind of colliery flood according to claim 6 administers well boring method, it is characterized in that：The injecting paste material is preferred
For single liquid cement mortar, R325 slag silicate cement, water ash proportioning is 3:1~1:1；Or use part flyash, cement and fine coal
Ash presses 1:1~1:3 proportionings.
8. a kind of colliery flood according to claim 6 administers well boring method, it is characterized in that：The grouting process is preferred
Well head hangs filling formula continuous grouting pattern, including：(1) clean-up line, (2) grouting pipeline pressure testing, (3) packer permeability test into hole, (4)
Slip casting, (5) replace water into hole；The packer permeability test into hole is used increases to maximum pump amount pressure water, small pump step by step by small pump amount
The amount pressure water time is not less than 0.5 hour, and the maximum pump magnitude pressure water time is not less than 1 hour；It is described that its total Water of water is replaced into hole
For 1--1.5 times of grouting pipeline total measurement (volume).
9. a kind of colliery flood according to claim 6 administers well boring method, it is characterized in that：The grouting pressure is by noting
The pressure of stock pump, slurries from gravity, the resistance of pipeline and hydrostatic pressure composition, preferably high-pressure slip-casting pattern, slip casting terminates mark
Will is that grouting pressure reaches 12MPa；The slip casting density selects cement slurry density between 1.15-1.30g/cm3；The note
Starch ending standard：Slip casting termination pressure is 12MPa, and end pumpage is 200L/min, voltage stabilizing 30 minutes.
10. a kind of colliery flood according to claim 3 administers well boring method, it is characterized in that：The hydraulic cutter sheet
Body is followed successively by top connection (1), outer barrel (2), cutter head (3) and bottom (4), the outer barrel (2) provided with nozzle (2- by upper under
1), piston (2-2), back-moving spring (2-3) and feed rod (2-4), the shank of the cutter head (3) are connected with feed rod (2-4),
Body is stretched out in the presence of piston (2-2)；The bottom (4) is provided with wiper block (4-1).
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| CN108643834A (en) * | 2018-03-30 | 2018-10-12 | 兰州城市学院 | A kind of boring method for building target based on full well |
| CN110700790A (en) * | 2019-09-26 | 2020-01-17 | 中煤科工集团西安研究院有限公司 | Complete hole sealing method for coal mine underground Ordovician limestone aquifer large-flow water-gushing and sand-gushing drill hole |
| CN112664159A (en) * | 2020-12-24 | 2021-04-16 | 北京大地高科地质勘查有限公司 | Horizontal directional leaking stoppage method for small-sized cracks of coal seam roof |
| CN114544900A (en) * | 2022-03-08 | 2022-05-27 | 贵州省地质环境监测院(贵州省环境地质研究所) | Simulation experiment method for acid mine water and geological control of coal mine |
| CN116971724A (en) * | 2023-09-21 | 2023-10-31 | 中国煤炭地质总局勘查研究总院 | Composite multi-branch drilling method for geological carbon dioxide sequestration and monitoring |
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