CN104141470B - The pore-forming molding method of underground coal mine fracturing borehole casing section - Google Patents
The pore-forming molding method of underground coal mine fracturing borehole casing section Download PDFInfo
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- CN104141470B CN104141470B CN201410309336.6A CN201410309336A CN104141470B CN 104141470 B CN104141470 B CN 104141470B CN 201410309336 A CN201410309336 A CN 201410309336A CN 104141470 B CN104141470 B CN 104141470B
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Abstract
The pore-forming molding method of a kind of underground coal mine fracturing borehole casing section, it comprises the steps of: step one: perforate is constructed, and creeps into be formed preset holes by BHA, and described preset holes ensures not skewed as far as possible；Step 2: lower first order sleeve pipe and aperture sealing；Step 3: two open construction, creeps into be formed two again by BHA and spuds in hole, and guarantee that register hole is the most not skewed；Step 4: lower second level sleeve pipe, the length of described second level sleeve pipe is greater than two degree of depth spudding in hole；Step 5: complete opening section cementing sealing and time are solidifying, utilize grouting pump prepad fluid, cement mortar and after pad to be pressed in the sleeve pipe of the second level from cement injection mouth successively, after completing slip casting, waiting thes cement solidifies forms cement sheath outside the sleeve pipe of the second level；Thus, the present invention, by boring and the cooperation of two-stage sleeve pipe, can effectively meet the requirement that opening arrangement is installed by fracturing construction, solve the problem that coal mine underground fracturing borehole casing sealing is off quality.
Description
Technical field
The invention belongs to the technical field of underground coal mine fracturing transformation, be specifically related to a kind of coal
The pore-forming molding method of fracturing borehole casing section under mine.
Background technology
Gas (or coal bed gas) boring is transformed by fracturing, it is possible to increase coal petrography around hole wall
The breathability of body, raising gas pumping efficiency, extend the scope of the effective extraction of single hole gas, fall
Low drilling construction workload and shortening gas pre-drainage time.In order to utilize fracturing unit to coal mine
Fracturing transformation is implemented in the boring of the nearlyest horizontal orientation, currently mainly by following two technology hands
Section realizes: one is to utilize the ground coal bed gas straight well disclosed or implement new ground straight well work
For passage, ground fracturing equipment is connected with underworkings gas drilling, utilizes ground fracturing
Equipment implements the fracturing transformation of underground coal mine nearly horizontal orientation boring；Two be develop applicable
The miniaturization fracturing unit of underground coal mine, uses the underground fracture equipment of miniaturization to implement coal mine
The fracturing transformation of the nearlyest horizontal orientation boring.
Hydraulic fracturing pressure is generally 15MPa～25MPa, even up to 35MPa, and conventional
Coal mine underground gas borehole orifice tube sealing mode (as resin encapsulation, intubate slip casting sealing,
Match the methods such as auspicious sealing material mechanical type sealing and pouch mechanical type sealing) sealing pressure rating
Low, it is impossible to enough to meet the safety requirements of fracturing construction, it is difficult to realize safe and environment-friendly wanting
Ask.
To this end, the designer of the present invention is in view of in order to meet fracturing construction to opening arrangement
Installation requirement, when the boring hole body structure design of underground coal mine nearly horizontal orientation, perforate section needs
Enter the sleeve pipe of certain depth under consideration, carry out cement sealing, and casing section is carried out pressure test,
After casing section pressure test reaches design pressure requirement, underground coal mine fracturing watt can be carried out
This next step construction operation of holing, by concentrating on studies and designing, is comprehensively engaged in phase for a long time for many years
The experience of pass industry and achievement, research design goes out a kind of underground coal mine fracturing borehole casing section
Pore-forming molding method, to overcome drawbacks described above.
Summary of the invention
The technical problem to be solved in the present invention is: due to the hole sleeve sealing of conventional gas drilling
Pressure rating is low, it is impossible to meet the construction problem of its fracturing safety requirements, and gas drilling is opened
Inclination angle, hole is generally positive-angle, is nearly level or perforate of facing upward, and during cementing, uses one-level
Collar aperture body structure, annular gap is difficult to be completely filled, and sealing quality dissatisfaction often occurs
Problem.
For solving the problems referred to above, the invention discloses a kind of underground coal mine fracturing borehole casing
The pore-forming molding method of section, it is characterised in that comprise the steps of:
Step one: perforate is constructed, and creeps into be formed preset holes by BHA, described preset
Hole ensures not skewed as far as possible and deposits without landwaste (rock dust)；
Step 2: lower first order sleeve pipe and aperture sealing, will enter preset holes under first order sleeve pipe
In, and the aperture of preset holes is carried out sealing, sealing rear thread connects first order sleeve pipe and first
Level sleeve aperture ring flange；
Step 3: two open construction, creeps into be formed two again by BHA and spuds in hole, and
Guarantee two spud in hole the most not skewed and without landwaste (rock dust) deposit；
Step 4: lower second level sleeve pipe, the length of described second level sleeve pipe is greater than two and spuds in hole
The degree of depth, second level casing flange dish is connected with the upper end of second level sleeve pipe, then by the second level
Sleeve pipe is pressed in first order sleeve pipe, finally by gland flange dish and first order casing flange dish and
Second level casing flange dish connects, and the bottom of described second level sleeve pipe is provided with multiple through second
Level sleeve bottom side opening；
Step 5: complete opening section cementing sealing and time are solidifying, by grouting pipeline and gland flange dish
The cement injection mouth arranged connects, and utilizes grouting pump by prepad fluid, cement mortar and after pad successively
It is pressed in the sleeve pipe of the second level from cement injection mouth, after completing slip casting, waits and theing cement solidifies the
Two grades of sleeve pipe outer ring-like gaps form cement sheath.
Wherein: also comprise the steps of six: pressure test, first on gland flange dish is opened
Stop valve, the water in emptying second level sleeve pipe, after laying down gland flange dish under drill through hole, appear
Carry brill after second level sleeve pipe 0.5～1m, gland flange dish is installed again, then injects in hole
Clear water carries out pressure test.
Wherein: in step one, Φ 153mm core bit+Φ 146mm reducing joint is used
First drill set of the outer flush drill stem of+Φ 146mm sleeve pipe+Φ 146mm reducing joint+Φ 73mm
Close and first carry out preset holes core-drilling, until being drilled into desired depth；Core-drilling proposes after completing
First BHA, uses Φ 153mm drill bit+Φ 146mm to insert along hole drill tool+Φ 130mm
Connect the second BHA of formula auger stem and carry out preset holes along hole and deslagging, crept into by twice
Operation, it is ensured that the cleannes on the downside of the perpendicularity of preset holes and boring, it is ensured that enter the under follow-up
The operation of one-level sleeve pipe is smoothed out.
Wherein: under enter sealing pressure after first order sleeve pipe and, less than 3MPa, enter under first order sleeve pipe
The degree of depth is less than 10m, and first order sleeve pipe uses nonmetallic materials tubing, the aperture of first order sleeve pipe
Sealing uses the molding method in the underground coal mine routine gas holes such as resin encapsulation.
Wherein: step 3 first uses+2 Φ 130mm augers of Φ 133mm comprehensive drill bit
3rd BHA of bar+Φ 120mm auger stem, till abrasion drill feeds out rock stratum 1m,
After carrying brill, outside using Φ 133mm comprehensive drill bit+2m Φ 127mm along hole drill tool+Φ 73mm
4th BHA of flush drill stem, along at the bottom of Kong Zhikong, creeps into operation again by twice, it is ensured that
Cleannes on the downside of the perpendicularity of boring and boring, it is ensured that the operation entering second level sleeve pipe under follow-up is suitable
Profit is carried out.
Wherein: cement pulp-water ash weight ratio is 1:1.6.
Compared with prior art, the pore-forming of the underground coal mine fracturing borehole casing section of the present invention
Molding method achieves that:
1, two grades of sleeve pipes are entered under in the casing section construction of coal mine underground fracturing boring, by boring
Hole and the cooperation of two-stage sleeve pipe, can effectively meet fracturing construction and want opening arrangement installation
Ask, solve the problem that coal mine underground fracturing borehole casing sealing is off quality；
2, by the guarantee of bore process, hole scattering is little, and perpendicularity is high, side-lower of holing
The landwaste (rock dust) of deposition is few, it is ensured that being smoothed out of setting of casing operation；
3, coordinating between the design of casing section two-stage sleeve structure with two-stage sleeve pipe, cement is made
Can fully be filled with, both avoid the waste of inserts, also made the pressure outside the sleeve pipe of the second level
Power is guaranteed, therefore, and high practicability of the present invention and creativeness.
The detailed content of the present invention can be obtained by explanation described later and institute's accompanying drawing.
Accompanying drawing explanation
Accompanying drawing 1 is coal mine underground fracturing borehole casing sector hole body structure schematic diagram；
Accompanying drawing 2 is coal mine underground fracturing borehole casing sector hole mouth connection diagram；
Accompanying drawing 3 is the pore-forming molding method of underground coal mine fracturing borehole casing section of the present invention
Concrete steps；
Label and symbol description in figure: 1, cement injection mouth；2, the first stop valve；3, pressure
Lid ring flange；4, second level sleeve aperture ring flange；5, first order sleeve aperture ring flange；
6, packing_seal part；7, bolt；8, discharge outlet；9, the second stop valve；10, resin envelope
Gu；11, first order sleeve pipe；12, second level sleeve pipe；13, cement sheath；14, second level set
Pipe bottom side opening.
Detailed description of the invention
The present invention is described in detail for 1-3 and detailed description of the invention below in conjunction with the accompanying drawings.
The pore-forming molding method of underground coal mine fracturing borehole casing section of the present invention mainly comprises
Following steps:
Step one: perforate is constructed, and creeps into be formed preset holes by BHA, described preset
Hole ensures not skewed as far as possible and deposits without landwaste (rock dust)；
Wherein, not skewed for guaranteeing when preset holes is holed, the present invention can use Φ 153mm to take
Heart drill bit+Φ 146mm reducing joint+Φ 146mm sleeve pipe+Φ 146mm reducing joint
First BHA of the outer flush drill stem of+Φ 73mm first carries out preset holes core-drilling, until being drilled into
Desired depth, requires in drilling process gently to press slow-speed；Core-drilling proposes the first drilling tool after completing
Combination, uses Φ 153mm drill bit+Φ 146mm along hole drill tool+Φ 130mm plug-in type spiral
Second BHA of drilling rod carries out preset holes along hole and deslagging, is also with surveying after having constructed
Measuring appratus carries out deviational survey, thus, creeps into operation by twice, it is ensured that the perpendicularity of preset holes
With the cleannes on the downside of boring, it is ensured that the operation entering first order sleeve pipe 11 under follow-up is smoothed out.
Step 2: lower first order sleeve pipe 11 and aperture sealing, pre-by entering under first order sleeve pipe
Putting in hole, and the aperture of preset holes is carried out sealing, sealing rear thread connects first order sleeve pipe
11 with first order sleeve aperture ring flange 5, to prevent first order sleeve pipe 11 end thread from executing
Damage in work；
Wherein, for guaranteeing subsequent handling, under enter first order sleeve pipe 11 after sealing pressure only need to expire
Pressure requirements during foot second level sleeve pipe 12 cementing, therefore without elevated pressures grade, pressure
Power requires to be generally less than 3MPa, and first order sleeve pipe 11 depth of setting is generally less than 10m, for
Reducing down tube difficulty, first order sleeve pipe 11 can use nonmetallic materials tubing.
Wherein, the aperture sealing of first order sleeve pipe 11 can use conventional coal mine underground gas borehole
Orifice tube sealing mode, as use resin encapsulation 10.
Step 3: two open construction, creeps into be formed two again by drilling tool and spuds in hole, and guarantee
Two spud in hole the most not skewed and without landwaste (rock dust) deposit；
Wherein, for realize two spud in hole do not tilt and without landwaste (rock dust) deposit, first use
The of+2 Φ 130mm auger stem+Φ 120mm auger stems of Φ 133mm comprehensive drill bit
Three BHAs, till abrasion drill feeds out rock stratum 1m, after carrying brill, use Φ 133mm complete
Face drill bit+2m Φ 127mm is suitable along the 4th BHA of the outer flush drill stem of hole drill tool+Φ 73mm
Hole and deslagging, at the bottom of hole, are also with measuring instrument and carry out deviational survey, again by twice after completing
Creep into operation, it is ensured that cleannes on the downside of the perpendicularity of boring and boring, it is ensured that enter the under follow-up
The operation of two grades of sleeve pipes 12 is smoothed out.
Step 4: lower second level sleeve pipe 12；
Wherein, described second level sleeve pipe 12 forms for many sleeve combination, uses metal canula,
It is threaded between many sleeve pipes, and the length of described second level sleeve pipe 12 is greater than two and opens
The degree of depth of boring, to ensure to reserve certain length in two apertures spudding in hole, in order to the second level
Casing flange dish 4 is threadeded afterwards and first order casing flange dish 5 with second level sleeve pipe 12
Bolt 7 connect；Can check between first order casing flange dish 5 and first order sleeve pipe 11
Threaded and after confirming pressure requirements when can meet slip casting, at second level casing flange dish 4
Be wound around packing sealing member 6 or gauze sealing member on pipe, then by second level casing flange dish 4 with
The upper end of second level sleeve pipe 12 connects, then by rig, second level sleeve pipe 12 is pressed into first
In level sleeve pipe 11, thus by between first order casing flange dish 5 and second level casing flange dish 4
Packing (or gauze) 6 seal and compress, finally by gland flange dish 3 and first order tiretube process
Blue dish 5 and second level casing flange dish 4 are connected by bolt 7, described second level sleeve pipe 12
Bottom be provided with multiple through second level sleeve bottom side opening 14.
Step 5: complete opening section cementing sealing and time are solidifying；
Wherein, grouting pipeline is connected with the cement injection mouth 1 arranged on gland flange dish 3,
The first stop valve 2, described first order casing flange dish 5 it is additionally provided with on described gland flange dish 3
Periphery be provided with discharge outlet 8 and the second stop valve 9, open the first stop valve 2 and the second cut-off
After valve 9, utilize grouting pump by preprepared prepad fluid, cement mortar and after pad successively from
Cement injection mouth 1 is pressed in second level sleeve pipe 12, observes on first order casing flange dish 5
Discharge outlet 8, when there being cement mortar to return out, close the first stop valve 2 and the second stop valve 9,
Stopping slip casting, the grouting pipeline that dismounting cement injection mouth 1 connects, cementing job completes, its
Middle cement pulp-water ash weight ratio is 1:1.6, after slip casting wait the cement solidifies and at second level sleeve pipe
Outer formation cement sheath 13, at least waits solidifying 3 order of classes or grades at school.
Thus, by above-mentioned steps, the present invention in the technique that underground coal mine fracturing is holed,
Pierced and the putting into of two-stage sleeve pipe by two-stage, effectively overcome the defect of prior art, not only
Effectively meet the safety requirements of fracturing, it is ensured that during cementing, annular gap can in two-stage
It is sufficient filling with between sleeve pipe, thus ensure that sealing quality.
Preferably, the present invention also comprises the steps of six: pressure test, opens the first stop valve
2, the water in emptying second level sleeve pipe 12, lay down gland flange dish 3, drill through hole down,
Carry brill after appearing second level sleeve pipe 12 to 0.5～1m, gland flange dish is installed again, then
In hole, injected clear water carries out pressure test, pneumatic test pressure and Hydraulic fracturing pressure grade phase
With.After casing section pressure test reaches design pressure requirement, carry out underground coal mine fracturing watt
This next step construction operation of holing.
Thus, it is an advantage of the current invention that:
1, two grades of sleeve pipes are entered under in the casing section construction of coal mine underground fracturing boring, by boring
Hole and the cooperation of two-stage sleeve pipe, can effectively meet fracturing construction and want opening arrangement installation
Ask, solve the problem that coal mine underground fracturing borehole casing sealing is off quality；
2, by the guarantee of bore process, hole scattering is little, and perpendicularity is high, side-lower of holing
The landwaste (rock dust) of deposition is few, it is ensured that being smoothed out of setting of casing operation；
3, coordinating between the design of casing section two-stage sleeve structure with two-stage sleeve pipe, cement is made
Can fully be filled with, both avoid the waste of inserts, also made the pressure outside the sleeve pipe of the second level
Power is guaranteed, therefore, and high practicability of the present invention and creativeness.
It is readily apparent that above description and record are only to illustrate rather than in order to limit this
Disclosure of the invention content, apply or use.Although describing the most in an embodiment and attached
Figure describes embodiment, but the present invention is not intended to by accompanying drawing example and describes in an embodiment
As it is now recognized that optimal mode with implement the teachings of the present invention specific examples, the present invention's
Scope will include any embodiment falling into description and appended claims above.
Claims (3)
1. a pore-forming molding method for underground coal mine fracturing borehole casing section, its feature
It is to comprise the steps of:
Step one: perforate is constructed, and creeps into be formed preset holes by BHA, described preset
Hole ensures not skewed and deposits without landwaste, uses Φ 153mm core bit+Φ 146mm different
The of the outer flush drill stem of drive connector+Φ 146mm sleeve pipe+Φ 146mm reducing joint+Φ 73mm
One BHA first carries out preset holes core-drilling, until being drilled into desired depth；Core-drilling is complete
Propose the first BHA after one-tenth, use Φ 153mm drill bit+Φ 146mm along hole drill tool+Φ
Second BHA of 130mm plug-in type auger stem carries out preset holes along hole and deslagging, logical
Cross twice and creep into operation, it is ensured that the cleannes on the downside of the perpendicularity of preset holes and boring, it is ensured that
The operation entering first order sleeve pipe under follow-up is smoothed out；
Step 2: lower first order sleeve pipe and aperture sealing, will enter preset holes under first order sleeve pipe
In, and the aperture of preset holes is carried out sealing, sealing rear thread connects first order sleeve pipe and first
Level sleeve aperture ring flange, under enter after the first order sleeve pipe sealing pressure less than 3MPa, the first order
Casing setting depth is less than 10m, and first order sleeve pipe uses nonmetallic materials tubing, first order set
The aperture sealing of pipe uses the molding method in resin encapsulation underground coal mine routine gas hole；
Step 3: two open construction, creeps into be formed two again by BHA and spuds in hole, and
Guarantee two spud in hole not skewed and without landwaste deposit, first use Φ 133mm comprehensive drill bit+2
3rd BHA of Φ 130mm auger stem+Φ 120mm auger stem, rotary drilling
To going out rock stratum 1m, after carrying brill, use Φ 133mm comprehensive drill bit+2m Φ 127mm
Along the 4th BHA of the outer flush drill stem of hole drill tool+Φ 73mm along hole and deslagging at the bottom of hole, with
Sample creeps into operation by twice, it is ensured that cleannes on the downside of the perpendicularity of boring and boring, it is ensured that
The operation entering second level sleeve pipe under follow-up is smoothed out；
Step 4: lower second level sleeve pipe, described second level sleeve pipe is that many sleeve combination form,
Using metal canula, be threaded between many sleeve pipes, the length of described second level sleeve pipe is wanted
Spud in more than two the degree of depth in hole, to ensure to reserve certain length in two apertures spudding in hole, in order to
Rear and first order casing flange of threadeding in second level casing flange dish with second level sleeve pipe
The bolt of dish connects；Check threadeding between first order casing flange dish and first order sleeve pipe
And after confirming pressure requirements when can meet slip casting, the pipe of second level casing flange dish is wound around
Packing_seal part or gauze sealing member, by the upper end of second level casing flange dish Yu second level sleeve pipe
Connect, then by rig, second level sleeve pipe is pressed in first order sleeve pipe, finally by gland method
Blue dish is connected with first order casing flange dish and second level casing flange dish, thus by first order set
Packing or gauze between pipe flange and second level casing flange dish seal and compress, finally by gland
Ring flange is bolted with first order casing flange dish and second level casing flange dish, described
The bottom of second level sleeve pipe is provided with multiple through second level sleeve bottom side opening；
Step 5: complete opening section cementing sealing and time are solidifying, by grouting pipeline and gland flange dish
The cement injection mouth arranged connects, and utilizes grouting pump by prepad fluid, cement mortar and after pad successively
It is pressed in the sleeve pipe of the second level from cement injection mouth, after completing slip casting, waits and theing cement solidifies the
Two grades of sleeve pipe outer ring-like gaps form cement sheath.
2. pore-forming molding method as claimed in claim 1, it is characterised in that: also comprise as
Lower step 6: pressure test, opens the first stop valve on gland flange dish, is vented the second level
Water in sleeve pipe, after laying down gland flange dish under drill through hole, appear second level sleeve pipe 0.5～1m
After carry brill, again install gland flange dish, then in hole, injected clear water carries out pressure test.
3. pore-forming molding method as claimed in claim 1, it is characterised in that: cement pulp-water
Ash weight ratio is 1:1.6.
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| CN201410309336.6A CN104141470B (en) | 2014-07-01 | 2014-07-01 | The pore-forming molding method of underground coal mine fracturing borehole casing section |
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| CN201410309336.6A CN104141470B (en) | 2014-07-01 | 2014-07-01 | The pore-forming molding method of underground coal mine fracturing borehole casing section |
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| CN104141470B true CN104141470B (en) | 2016-09-28 |
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| CN104929573A (en) * | 2014-12-18 | 2015-09-23 | 安徽恒源煤电股份有限公司 | Casing pressure test method for grouting orifice pipes |
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| CN111852327B (en) * | 2020-08-14 | 2022-04-01 | 安徽铜冠（庐江）矿业有限公司 | Water outlet and control method for filling and drilling construction |
| CN113803103B (en) * | 2021-09-17 | 2023-12-01 | 山东科技大学 | Multistage progressive gas extraction device and method |
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