CN110056354A - The method of horizontal well pitching sliding sleeve staged fracturing in coal mine tight roof tunnel - Google Patents
The method of horizontal well pitching sliding sleeve staged fracturing in coal mine tight roof tunnel Download PDFInfo
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- CN110056354A CN110056354A CN201910324612.9A CN201910324612A CN110056354A CN 110056354 A CN110056354 A CN 110056354A CN 201910324612 A CN201910324612 A CN 201910324612A CN 110056354 A CN110056354 A CN 110056354A
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000003245 coal Substances 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 9
- 230000007423 decrease Effects 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 210000001109 blastomere Anatomy 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention provides the methods of horizontal well pitching sliding sleeve staged fracturing in a kind of coal mine tight roof tunnel, comprising: the first pressure difference sliding sleeve is directed at the first fracturing section and puts into the first pressure break ball in fracturing string；Fracturing string is connected to water injecting pump, water injecting pump is opened to inject fracturing fluid into Steel Tube Special the first pressure break ball to be pushed into the first ball seat, when the pressure value in fracturing string reaches preset pressure value, pressure stabilizing preset time on fracturing string so as to have open hole packer completely setting, after all open hole packers are completely setting, continue water filling until the first pressure difference sliding sleeve is opened, fracturing pump continues to inject fracturing fluid to carry out fracturing work to the first fracturing section；Until the discharge capacity pressure value of water injecting pump continually and steadily decline suddenly occurs after discharge capacity pressure value is unchanged to discharge capacity pressure value from pressure, terminate the fracturing work to the first fracturing section.The pressure break period has been saved using this method, has improved the production efficiency of coal mine.
Description
Technical field
The present invention relates to coal mining technology fields, in particular to horizontal well in a kind of coal mine tight roof tunnel
The method of pitching sliding sleeve staged fracturing.
Background technique
If having tight roof will cause in coal mining, deformation of the surrounding rock in tunnel is serious, advanced mine pressure acutely shows, or even makes
At rock blast hazard.The Coal Mine Accidents as caused by tight roof, existing similar techniques are orientation hydraulic fracturing technologies, this
There are the following problems in practice for method:
1, increase orientation grooving process when pressing crack construction before each pressure break, construction period is caused to extend.
2, existing fracturing tool cannot be pushed into net horizontal section.
3, deviated directional drilling drilling depth is small, generally less than 150m, and working face deep outstanding problem not can solve.
4, deviated directional drilling wellbore is small, and depth is more than that 100m fracturing tool is difficult tripping in.
5, fracturing tool diameter is small, small by pulling force, pressure, and tool feeding can only take artificial pushing style, Gong Renlao
Fatigue resistance is big, needs number more, and it is limited to be sent into depth.
Summary of the invention
The main purpose of the present invention is to provide horizontal well pitching sliding sleeve staged fracturings in a kind of coal mine tight roof tunnel
Method, to solve the problems, such as long construction period in the prior art.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of coal mine tight roof tunnel Nei Shui
The method of horizontal well pitching sliding sleeve staged fracturing, method is the following steps are included: step 1: in coal mine roadway drilling machine by fracturing string
It is pushed in the open-hole horizontal well being deployed in face roof preset range, until the first pressure difference sliding sleeve is directed at the first pressure break
Section simultaneously puts into the first pressure break ball in fracturing string；Step 2: connection fracturing string opens water injecting pump with to high pressure to water injecting pump
Injection fracturing fluid is preset so that the first pressure break ball to be pushed into the first ball seat when the pressure value in fracturing string reaches first in steel pipe
When pressure value, pressure stabilizing preset time so that having on fracturing string open hole packer is completely setting, when all open hole packers
Completely it is setting after, continue water filling being forced into the second preset pressure value until the first pressure difference sliding sleeve open, fracturing pump continue injection pressure
Liquid is split to carry out fracturing work to the first fracturing section；Step 3: when filling the water pump pressure and rising to up to roof strata fracture pressure,
Keep the discharge capacity pressure of water injecting pump with vee crack, until the discharge capacity pressure value of water injecting pump is from pressure continually and steadily to discharge capacity pressure
There is decline suddenly after discharge capacity pressure value is unchanged in value, terminates the fracturing work to the first fracturing section；Step 4: in pressure break
The second pressure break ball is put into tubing string, repeats step 2 and step 3 so that the second pressure break ball is located at corresponding with the second fracturing section second
In ball seat, and by injection fracturing fluid so that the second pressure difference sliding sleeve corresponding with the second fracturing section is opened to complete to the second pressure break
The fracturing work of section.
Further, before step 1 further include: step 01: by the open-hole horizontal well in face roof preset range
Multiple fracturing sections are divided into, fracturing work is successively carried out to multiple fracturing sections using fracturing string, wherein using on fracturing string
The N pressure difference sliding sleeve and M pressure break ball being arranged successively carry out fracturing work to multiple fracturing sections, and multiple fracturing sections include the first pressure
Split section and the second fracturing section.
Further, pressure stabilizing preset time is T, wherein 4min≤T≤6min.
Further, before step 1 further include: before constructing to open-hole horizontal well, on the top of open-hole horizontal well
The predetermined position of the same level of plate manufactures many cracks.
Further, preset pressure value, the first preset value are P1, wherein 5MPa≤P1≤6MPa.；Second preset value is
P2, wherein 8MPa≤P2≤10MPa.
Further, after the completion of successively carrying out fracturing work to multiple fracturing sections, Steel Tube Special is carried out to bleed off pressure processing,
Fracturing string is risen by coal mine roadway drilling machine, is completed to fractured horizontal well construction operation.
Further, method further include: in fracturing process, using passive micro-seismic monitoring method, in heading cloth
Set receiver, real-time monitoring crack three-dimensional trend.
Further, method further include: in fracturing process, install pressure discharge capacity recorder in water filling pump discharge, in real time
Monitor frac pressure and discharge capacity.
Further, during constructing to open-hole horizontal well, the distance of two neighboring packer is less than 20m.
It applies the technical scheme of the present invention, using the implementation method, capable of making fracturing string, activity is freely in horizontal well
Feeding and pull-out.Coal mine is exploited using this method, is effectively reduced the intensity of hand labor, so that a pressure break pipe
Column can realize multiple staged fracturing, save the pressure break period, improve the production efficiency of coal mine.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram of the embodiment of horizontal well pitching sliding sleeve fracturing strings according to the present invention；
Fig. 2 shows the structural schematic diagrams of the embodiment of horizontal well pitching sliding sleeve staged fracturing technique according to the present invention.
Wherein, the above drawings include the following reference numerals:
1, guide shoe；2, ball seat；3, pressure difference sliding sleeve；4, packer；5, safety joint；6, open-hole horizontal well；7, fracturing string；
8, water pot；9, high pressure water-injection pump；10, accumulator；11, pressure sensor；12, flow sensor；13, pressure flow
Data acquisition；14, high-pressure hose；15, hydraulic control high pressure gate；16, drilling machine, 17, ESD control device；18, microseism data processing
Device；19, microseism inductor；20, fracturing string；21, horizontal well.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
It should be noted that term " first ", " second " etc. in the description and claims of this application and attached drawing
It is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that the art used in this way
Language is interchangeable under appropriate circumstances, so that presently filed embodiment described herein for example can be in addition to illustrating herein
Or the sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
Now, the illustrative embodiments according to the application are more fully described with reference to the accompanying drawings.However, these are exemplary
Embodiment can be implemented by many different forms, and should not be construed to be limited solely to embodiment party set forth herein
Formula.It should be understood that it is thoroughly and complete to these embodiments are provided so that disclosure herein, and these are shown
The design of example property embodiment is fully conveyed to those of ordinary skill in the art, in the accompanying drawings, for the sake of clarity, it is possible to expand
The big thickness of layer and region, and make that identical device is presented with like reference characters, thus omission retouches them
It states.
Referring to figs. 1 and 2, according to an embodiment of the invention, providing horizontal in a kind of coal mine tight roof tunnel
The method of well pitching sliding sleeve staged fracturing.
Specifically, method includes the following steps: step 1: fracturing string being pushed to portion with drilling machine in coal mine roadway
Administration is in the open-hole horizontal well in face roof preset range, until the first pressure difference sliding sleeve is directed at the first fracturing section and in pressure break
The first pressure break ball is put into tubing string；Step 2: connection fracturing string to water injecting pump opens water injecting pump to inject into Steel Tube Special
Fracturing fluid is the first pressure break ball to be pushed into the first ball seat, when the pressure value in fracturing string reaches the first preset pressure value P1
When, pressure stabilizing preset time so that having on fracturing string open hole packer is completely setting, when all complete seats of open hole packer
It is honored as a queen, continues water filling until the first pressure difference sliding sleeve is opened when pressure rises to the second preset pressure value P2, fracturing pump continues injection pressure
Liquid is split to carry out fracturing work to the first fracturing section；Step 3: when filling the water pump pressure and rising to up to roof strata fracture pressure,
Keep the discharge capacity pressure of water injecting pump with vee crack, until the discharge capacity pressure value of water injecting pump is from pressure continually and steadily to discharge capacity pressure
There is decline suddenly after discharge capacity pressure value is unchanged in value, terminates the fracturing work to the first fracturing section；Step 4: in pressure break
The second pressure break ball is put into tubing string, repeats step 2 and step 3 so that the second pressure break ball is located at corresponding with the second fracturing section second
In ball seat, and by injection fracturing fluid so that the second pressure difference sliding sleeve corresponding with the second fracturing section is opened to complete to the second pressure break
The fracturing work of section.
In the present embodiment, using the implementation method, can make fracturing string in horizontal well activity feeding freely and
It pulls out.Coal mine is exploited using this method, is effectively reduced the intensity of hand labor, so that a fracturing string can be realized
Multiple staged fracturing has saved the pressure break period, improves the production efficiency of coal mine.
Before step 1 further include: step 01: the open-hole horizontal well in face roof preset range being divided into multiple
Fracturing section successively carries out fracturing work to multiple fracturing sections using fracturing string, wherein using the N being arranged on fracturing string
Pressure difference sliding sleeve and M pressure break ball successively carry out fracturing work to multiple fracturing sections, and multiple fracturing sections include the first fracturing section and the
Two fracturing sections.
Preferably, pressure stabilizing preset time is T, wherein 4min≤T≤6min.
Further, before step 1 further include: before constructing to open-hole horizontal well, on the top of open-hole horizontal well
The predetermined position of the same level of plate manufactures many cracks.Preset pressure value, the first preset value are P1, wherein 5MPa≤
P1≤6MPa.；Second preset value is P2, wherein 8MPa≤P2≤10MPa.It is complete that multiple fracturing sections are successively carried out with fracturing work
Cheng Hou carries out Steel Tube Special to bleed off pressure processing, rises by fracturing string in coal mine roadway drilling machine, fractured horizontal well is applied in completion
Work industry.
Further, method further include: in fracturing process, using passive micro-seismic monitoring method, in heading cloth
Set receiver, real-time monitoring crack three-dimensional trend.In fracturing process, pressure discharge capacity recorder is installed in water filling pump discharge, it is real
When monitoring frac pressure and discharge capacity.During constructing to open-hole horizontal well, the distance of two neighboring packer is less than 20m.
Specifically, tight roof horizontal well pitching sliding sleeve staged fracturing method in coal mine roadway provided by the present application is coal
Mine solves top plate outstanding problem in advance comprehensively and provides solution, and economy reliability is prominent.
Staged fracturing is carried out to the open-hole horizontal well being deployed within face roof preset range in coal mine roadway,
What this method was implemented is mainly characterized in that pitching sliding sleeve, fixed tubular column, i.e., merges into one-trip string with completion tubular column and fracturing string
Tripping in together, using tools lower going-into-wells such as suspension expanding open hole packer, pitching sliding sleeve, pressure difference sliding sleeve and setting ball seats
It is interior, insulate horizontal segment using open hole packer, realize fracturing work well section laterally selective staged isolation, according to pressure break number of segment into
Row staged fracturing realizes the complete fracturing work of full well section.Details are as follows for the chief component of this method:
Fracturing string: the double envelope single deck tape-recorder fracturing strings schematic diagrames of horizontal well are as shown in Figure 1, fracturing tool includes pressure break pipe
(packer includes open hole packer n, pitching sliding sleeve n, naked eye packing for column 7 (high pressure water injection steel pipe), safety joint 5, packer 4
Device n-1, pitching sliding sleeve n-1 ... open hole packer 2, pitching sliding sleeve 2, open hole packer 1), oil pipe, pressure difference sliding sleeve 3, ball seat 2,
Guide shoe 1, wherein 6 be open-hole horizontal well, and A is top plate, and B is coal seam.
Fracturing tool: high pressure water injection outer diameter of steel pipes is generally less than or equal to 73mm in coal mine open-hole horizontal well, and pressure-bearing is big
In or equal to 70MPa, used to adapt to drilling machine in tunnel, every high pressure water injection length of steel pipe is less than or equal to 3m.
In place for convenience of drilling tool push, chamfering, bottom cooperation semicircle are drawn up and down for all steel pipes and tool hoop on tubing string
Shoes, high pressure water injection steel pipe add centralizer every 20m to 30m, and lower contact is machined with centralizer on open hole packer.Spherical structure is adopted
Meet material ball with low-density, is pressed into differential 0.125 inch of diameter of setting of well sequence.
Pressure break equipment: using ordi-nary drilling machine in tunnel tripping in or rise fracturing string, drilling machine push power and pulling force be greater than
Or it is equal to 10T.Fracturing pump uses driven high voltage water injecting pump, and power is greater than or equal to 50KW, and operating pressure is greater than or equal to
70MPa, discharge capacity are less than or equal to 1000L/min.
Fracturing pump is connected with high pressure water injection steel pipe to be connected using 70-105MPa high-pressure hose, horizontal well well head high pressure water injection
105MPa high pressure hydraulic control needle valve is installed at steel pipe, is controlled by independent hydraulic station, energy emergency shutdown, safety equipment when being pressure break,
Prevent high-pressure hose explosion from leading to the problem of tunnel and shaft safety.
Fracturing fluid: coal mine water or riverfrac treatment liquid are used.Roof pressure break does not need plus sandfilling crack, it is only necessary to clear
High pressure generates crack to water in short-term.
Fracturing parameter: construction parameter determines principle small displacement, high pressure, it is ensured that seam is long as long as possible.
Fracturing section divides: coal mine uses the complete well of open-hole horizontal well, determines number of fragments according to horizontal well lithologic character.2
Open hole packer card seals distance less than 20 meters.
Fracturing effect monitoring: it can selectively monitor according to production needs, using passive micro-seismic monitoring method, in coal seam lane
Receiver, real-time monitoring crack three-dimensional trend are arranged in road；Pressure break pump discharge installs pressure discharge capacity recorder, monitors pressure break pressure in real time
Power and discharge capacity.
According to another embodiment of the application, including step 1: assembling fracturing string according to design.
Step 2: fracturing string being pushed to drilling machine in coal mine roadway and has been deployed within face roof preset range
Open-hole horizontal well in, until the first pressure difference sliding sleeve be aligned the first fracturing section carry out pressure break.
Step 3: throwing the first pressure break ball, connection fracturing string to fracturing pump in fracturing string, turn on pump water filling pushes the first pressure
Blastomere slowly boosts to open hole packer setting pressure P1, pressure stabilizing 5min, setting all open hole packers to the first ball seat.
Step 4: continuing to boost to the cracking pressure P2 of the first pressure difference sliding sleeve, open the first pressure difference sliding sleeve.
Step 5: fracturing pump continue injection pressure split it is hydraulic split the first fracturing section, water filling pump pressure rapidly rises to up to roof strata
Fracture pressure maintains discharge capacity pressure vee crack, until discharge capacity is stable, pressure declines suddenly, observation pressure trend is unchanged, knot
The fracturing work of beam first segment fracturing section.
Step 6: the second pressure break ball in fracturing string, fracturing pump injection fracturing fluid push away the second pressure break ball into the second ball
Seat repeats step 4 and completes the second fracturing section.Step 5, step 6 are repeated, N sections of pressing crack constructions can be completed, wherein N can be
Natural number more than or equal to 3.It slowly bleeds off pressure to Steel Tube Special internal pressure 0MPa, plays fracturing string in coal mine roadway drilling machine
Out, the construction of horizontal well pitching sliding sleeve staged fracturing is completed.
It is that hard difficulty collapses siltstone according to certain coal mine face roof according to another embodiment of the application,
Preboring open-hole horizontal well at 30 meters of top plate, 400 meters of well depth, 250 meters of horizontal segment, implementing staged fracturing, steps are as follows:
Step 1: according to horizontal well lithology information, dividing 15 sections of fractured interval.
Step 2: assembling fracturing string, fracturing string is pushed to 380 meters with drilling machine in coal mine roadway.
Step 3: connection fracturing string to water injecting pump puts into the first pressure break ball, turn on pump water filling push the first pressure break ball of investment
To the first ball seat, pump pressure is raised slowly to 5MPa, pressure stabilizing 5min, setting all open hole packers.
Step 4: continuing to boost to the first pressure difference sliding sleeve cracking pressure 10MPa, open the first pressure difference sliding sleeve.
Step 5: fracturing pump continues to infuse fracturing fluid, the first fracturing section of pressure break, and fracturing pump pressure 55MPa roof strata ruptures,
Discharge capacity pressure 5-10min vee crack is maintained, pressure declines suddenly, and observation pressure trend is unchanged, terminates to the first fracturing section
Fracturing work.
Step 6: the second pressure break ball in fracturing string, fracturing pump injection fracturing fluid push away the second pressure break ball into the second ball
Seat repeats the fracturing work that step 5 completes the second fracturing section.Step 5, step 6 are repeated, the pressure break for completing 3-15 fracturing section is applied
Work.It slowly bleeds off pressure to Steel Tube Special internal pressure 0MPa, rises by fracturing string in coal mine roadway drilling machine, it is sliding to complete horizontal well pitching
Set segmented pressing crack construction.Design of string pipe and optimization make tubing string be sent into horizontal well and pull-out activity freely, utilize drilling machine construction
Labor intensity is reduced, a fracturing string can realize n times staged fracturing (N >=10), greatly save pressure break period, Ke Yi
Top plate same level fixed point manufacture many cracks, destroy entire face roof structure, extinction in advance, and overall effect is obvious.
It can solve working face deep top plate extinction problem using this method in open-hole horizontal well.Running string is not moved in construction period
It is dynamic, construction success rate can be greatly improved.This method is particularly suitable for the tight roofs such as coal mine siltstone, carbonate, can it is advanced,
It is economical, reliable to solve top plate outstanding problem.
Wherein, as shown in Fig. 2, during fracturing work, water pot 8, high pressure water-injection pump 9, accumulator 10, pressure are also used
Sensor 11, flow sensor 12, pressure flow data acquire 13, high-pressure hose 14, hydraulic control high pressure gate 15, drilling machine 16, ESD
Control device 17, microseism data processing equipment 18, microseism inductor 19, fracturing string 20.Wherein, in Fig. 2 21 for level
Well, C are tunnel.
Than that described above, it is also necessary to which explanation is " one embodiment " spoken of in the present specification, " another implementation
Example ", " embodiment " etc. refer to that specific features, structure or the feature of embodiment description is combined to be included in the application summary
Property description at least one embodiment in.It is not centainly to refer to the same reality that statement of the same race, which occur, in multiple places in the description
Apply example.Furthermore, it is understood that is advocated is knot when describing a specific features, structure or feature in conjunction with any embodiment
Other embodiments are closed to realize that this feature, structure or feature are also fallen within the scope of the present invention.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. the method for horizontal well pitching sliding sleeve staged fracturing in a kind of coal mine tight roof tunnel, which is characterized in that the method
The following steps are included:
Step 1: fracturing string being pushed to the naked eye being deployed in face roof preset range with drilling machine in coal mine roadway
In horizontal well, until the first pressure difference sliding sleeve is directed at the first fracturing section and puts into the first pressure break ball in fracturing string；
Step 2: connection fracturing string opens water injecting pump to inject fracturing fluid into Steel Tube Special with by the first pressure break to water injecting pump
Ball be pushed into the first ball seat in, when the pressure value in the fracturing string reaches the first preset pressure value, pressure stabilizing preset time with
Make on the fracturing string it is described have that open hole packer is completely setting, after all open hole packers are completely setting, continue
Water filling is forced into the second preset pressure value until the first pressure difference sliding sleeve is opened, and fracturing pump continues to inject fracturing fluid to the first pressure break
Duan Jinhang fracturing work；
Step 3: when filling the water pump pressure and rising to up to roof strata fracture pressure, the discharge capacity pressure of water injecting pump being kept to split to extend
Seam, until the discharge capacity pressure value of water injecting pump continually and steadily decline suddenly occurs up to discharge capacity pressure value to discharge capacity pressure value from pressure
After unchanged, terminate the fracturing work to the first fracturing section；
Step 4: putting into the second pressure break ball in fracturing string, repeat step 2 and step 3 so that the second pressure break ball is located at and second
In corresponding second ball seat of fracturing section, and by injection fracturing fluid so that the second pressure difference sliding sleeve corresponding with the second fracturing section is opened
To complete the fracturing work to the second fracturing section.
2. the method according to claim 1, wherein before step 1 further include:
Step 01: the open-hole horizontal well in face roof preset range being divided into multiple fracturing sections, using fracturing string pair
Multiple fracturing sections successively carry out fracturing work, wherein using the N pressure difference sliding sleeve and M pressure break ball pair being arranged on fracturing string
Multiple fracturing sections successively carry out fracturing work, and multiple fracturing sections include the first fracturing section and the second fracturing section.
3. the method according to claim 1, wherein pressure stabilizing preset time is T, wherein 4min≤T≤6min.
4. the method according to claim 1, wherein before step 1 further include: carried out to open-hole horizontal well
Before construction, many cracks are manufactured in the predetermined position of the same level of the top plate of open-hole horizontal well.
5. the method according to claim 1, wherein the first preset value is P1, wherein 5MPa≤P1≤6MPa.；
Second preset value is P2, wherein 8MPa≤P2≤10MPa.
6. according to the method described in claim 2, it is characterized in that, after the completion of successively carrying out fracturing work to multiple fracturing sections,
Steel Tube Special is carried out to bleed off pressure processing, rises by fracturing string in coal mine roadway drilling machine, completes to construct to fractured horizontal well and make
Industry.
7. the method according to claim 1, wherein the method also includes:
In fracturing process, using passive micro-seismic monitoring method, receiver is arranged in heading, real-time monitoring crack is three-dimensional
Trend.
8. the method according to claim 1, wherein the method also includes:
In fracturing process, pressure discharge capacity recorder is installed in water filling pump discharge, monitors frac pressure and discharge capacity in real time.
9. two neighboring the method according to claim 1, wherein during constructing to open-hole horizontal well
The distance of packer is less than 20m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910324612.9A CN110056354A (en) | 2019-04-22 | 2019-04-22 | The method of horizontal well pitching sliding sleeve staged fracturing in coal mine tight roof tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910324612.9A CN110056354A (en) | 2019-04-22 | 2019-04-22 | The method of horizontal well pitching sliding sleeve staged fracturing in coal mine tight roof tunnel |
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| Publication Number | Publication Date |
|---|---|
| CN110056354A true CN110056354A (en) | 2019-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910324612.9A Pending CN110056354A (en) | 2019-04-22 | 2019-04-22 | The method of horizontal well pitching sliding sleeve staged fracturing in coal mine tight roof tunnel |
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| CN (1) | CN110056354A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112253113A (en) * | 2020-09-10 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for weakening hard gangue layer by coal mine underground directional long drilling and staged hydraulic fracturing |
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| CN112253113A (en) * | 2020-09-10 | 2021-01-22 | 中煤科工集团西安研究院有限公司 | Method for weakening hard gangue layer by coal mine underground directional long drilling and staged hydraulic fracturing |
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