CN110056353A - The method of tight roof horizontal well water-jet staged fracturing in coal mine roadway - Google Patents
The method of tight roof horizontal well water-jet staged fracturing in coal mine roadway Download PDFInfo
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- CN110056353A CN110056353A CN201910324600.6A CN201910324600A CN110056353A CN 110056353 A CN110056353 A CN 110056353A CN 201910324600 A CN201910324600 A CN 201910324600A CN 110056353 A CN110056353 A CN 110056353A
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000003245 coal Substances 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000011435 rock Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 6
- 238000001802 infusion Methods 0.000 claims abstract description 5
- 230000000630 rising effect Effects 0.000 claims abstract description 4
- 230000007423 decrease Effects 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 20
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water 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
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- 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 a kind of methods of tight roof horizontal well water-jet staged fracturing in coal mine roadway, including being pushed to fracturing string in the open-hole horizontal well being deployed in face roof preset range in coal mine roadway with drilling machine, until hydraulic ejector is directed at the first fracturing section；Fracturing string is connected to water injecting pump, when opening water injecting pump suppressed into Steel Tube Special to the first preset value, after the packer set of hydraulic ejector side, water-jet head sprays fracturing liquid to stratum and penetrates out rock, annular space fluid infusion is carried out simultaneously, and water injecting pump continues to inject fracturing fluid to press the first fracturing section；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 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 tight roof horizontal well in a kind of coal mine roadway
The method of water-jet 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 tight roof horizontal well water-jet staged fracturings in a kind of coal mine roadway
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 tight roof water in a kind of coal mine roadway
The method of horizontal well water-jet staged fracturing, comprising: step 1: fracturing string being pushed to drilling machine in coal mine roadway and has been disposed
In the open-hole horizontal well in face roof preset range, until hydraulic ejector is directed at the first fracturing section；Step 2: connection
Fracturing string is to water injecting pump, when opening water injecting pump suppressed into Steel Tube Special to the first preset value, hydraulic ejector side
After packer set, water-jet head sprays fracturing liquid to stratum and penetrates out rock, while carrying out annular space fluid infusion, and water injecting pump continues
Fracturing fluid is injected to press the first fracturing section；Step 3: when filling the water pump pressure and rising to up to roof strata fracture pressure, keeping note
The discharge capacity pressure of water pump is with vee crack, until the discharge capacity pressure value of water injecting pump continually and steadily occurs to discharge capacity pressure value from pressure
After decline is until discharge capacity pressure value is unchanged suddenly, terminate the fracturing work to the first fracturing section；Step 4: to Steel Tube Special into
Row slowly bleed off pressure until Steel Tube Special in pressure reach the second preset value, use drilling machine drag fracturing tubing string to the second pressure break
Section, repetition step 2, step 3 complete the fracturing work to the second fracturing 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 are successively carried out to multiple fracturing sections using fracturing string, multiple fracturing sections include first
Fracturing section and the second fracturing section.
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, the first preset value is P1, wherein 2 MPa≤P1≤3MPa.
Further, the second preset value is P2=0 MPa.
Further, during to open-hole horizontal well pressure break, a small amount of pressure is added when needing water-jet head perforation
It splits sand and carries out fracturing work.
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.
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 water-jet fracturing strings according to the present invention；
Fig. 2 shows the structural schematic diagrams of the embodiment of horizontal well water-jet staged fracturing technique.
Wherein, the above drawings include the following reference numerals:
1, guide shoe；2, centralizer；3, hydraulic packer；4, opened by pressure sliding sleeve；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；22, silo；23, mulling is prized.
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, to provide tight roof in a kind of coal mine roadway horizontal
The method of well water-jet staged fracturing.
Specifically, this method comprises: step 1: being pushed to fracturing string with drilling machine in coal mine roadway and be deployed in work
In open-hole horizontal well in the top plate preset range of face, until hydraulic ejector is directed at the first fracturing section；Step 2: connection pressure break pipe
Column is to water injecting pump, when opening water injecting pump suppressed into Steel Tube Special to the first preset value, the packer of hydraulic ejector side
After setting, water-jet head sprays fracturing liquid to stratum and penetrates out rock, while carrying out annular space fluid infusion, and water injecting pump continues injection pressure
Liquid is split to press the first fracturing section；Step 3: when filling the water pump pressure and rising to up to roof strata fracture pressure, keeping water injecting pump
Discharge capacity pressure is with vee crack, until under the discharge capacity pressure value of water injecting pump continually and steadily occurs suddenly to discharge capacity pressure value from pressure
After drop is until discharge capacity pressure value is unchanged, terminate the fracturing work to the first fracturing section；Step 4: Steel Tube Special being carried out slow
Bleed off pressure until Steel Tube Special in pressure reach the second preset value, use drilling machine drag fracturing tubing string to the second fracturing section, repeat
Step 2, step 3 complete the fracturing work to the second fracturing 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.
Wherein, before step 1 further include: step 01: the open-hole horizontal well in face roof preset range is divided
At multiple fracturing sections, fracturing work is successively carried out to multiple fracturing sections using fracturing string, multiple fracturing sections include the first pressure break
Section and the second fracturing section.
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.First preset value is P1, wherein 2
MPa≤P1≤3MPa.Second preset value is P2=0 MPa.
Wherein, during to open-hole horizontal well pressure break, a small amount of fracturing sand is added when needing water-jet head perforation
Carry out fracturing work.In fracturing process, using passive micro-seismic monitoring method, receiver is arranged in heading, is supervised in real time
Survey crack three-dimensional trend.Pressure discharge capacity recorder is installed in water filling pump discharge, monitors frac pressure and discharge capacity in real time.
Specifically, top plate horizontal well water-jet staged fracturing technique in coal mine roadway full face 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 water-jet, i.e., generates high-velocity fluid with water-jet head and penetrate rock formation eyelet, with
Fluid generates the pressure for being higher than fracture pressure in eyelet bottom afterwards, extends hydraulic fracture, and drag fracturing tubing string makes water-jet head
It is directed at next section, realizes staged fracturing.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 successively includes pressure
Split tubing string 7 (high pressure water injection steel pipe), safety joint 5, centralizer 2, hydraulic packer 3, hydraulic ejector 4, guide shoe 1.Wherein, 6
For open-hole horizontal well, 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.For convenience of brill
In place, chamfering, bottom cooperate semicircle guide shoe up and down for all steel pipes and tool hoop on tubing string, and high pressure water injection steel pipe is every for tool push
Add centralizer every 20m to 30m, packer installs centralizer additional up and down.
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 500L/min.
Fracturing pump is connected with high pressure water injection steel pipe to be connected using 70MPa to 105MPa high-pressure hose, horizontal well well head high pressure
105MPa high pressure hydraulic control needle valve is installed at water-injection steel pipe, is controlled by independent hydraulic station, energy emergency shutdown fills safely when being pressure break
It is standby, prevent high-pressure hose explosion from leading to the problem of tunnel and shaft safety.
Fracturing fluid: " clear water+abrasive material+additive " fracturing fluid is used.Roof pressure break does not need plus sandfilling crack, only
It needs that a small amount of fracturing sand is added when water-jet head perforation.
Fracturing parameter: construction parameter determines that principle is 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, and fracturing tool card seals spacing 0.5-1 meters, and fracturing section divides
1 meter or so of minimum interval, largest interval can be adjusted according to actual situations of construction, and generally less than 10 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；It fills the water pump discharge and pressure discharge capacity recorder is installed, monitor pressure break pressure in real time
Power and discharge capacity.Specifically includes the following steps:
Step 1: fracturing string is assembled 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 hydraulic ejector be aligned the first fracturing section.
Step 3: connection fracturing string to water injecting pump, turn on pump fill the water, packer set when suppressing 2-3MPa in Steel Tube Special,
Water-jet head sprays fracturing liquid to stratum and penetrates out rock, while annular space fluid infusion, and driven high voltage water injecting pump continues to infuse fracturing fluid
The first interval of pressure break.
Step 4: pressing crack construction, water filling pump pressure rapidly rise to maintain discharge capacity pressure to expand up to roof strata fracture pressure
Crack is opened up, until discharge capacity is stable, pressure declines suddenly, observation pressure trend is unchanged, terminates first segment pressure break.
Step 5: slowly bleeding off pressure to Steel Tube Special internal pressure 0MPa, use drilling machine drag fracturing tubing string to the second fracturing section, weight
The second fracturing section pressure break is completed in multiple step 2,3.Step 2, step 3, step 4 are repeated, N sections of pressing crack constructions are completed.Slowly bleed off pressure
To Steel Tube Special internal pressure 0MPa, fracturing string is risen in coal mine roadway drilling machine, completes horizontal well water conservancy and spray staged fracturing
Construction.
According to another embodiment of the application, certain coal mine face roof is that hard difficulty collapses siltstone, in top plate
30 mouthfuls of preboring open-hole horizontal well at 30 meters, 360 meters of well depth, 200 meters of horizontal segment, implementing staged fracturing, steps are as follows:
Step 1: fracturing string being pushed to 360 meters with drilling machine in coal mine roadway.
Step 2: connection fracturing string to water injecting pump, turn on pump fill the water, packer set when suppressing 2MPa in Steel Tube Special.
Step 3: pressing crack construction: water injecting pump injects the rupture of the hydraulic coupling of pressure break containing sand 45MPa roof strata, and annular space is mended without sand pressure
Liquid vee crack is split, discharge capacity pressure 5min vee crack is maintained, pressure declines suddenly, terminates first segment pressure break.
Step 4: slowly bleeding off pressure to Steel Tube Special internal pressure 0MPa, using drilling machine drag fracturing tubing string to 355 meters, repeat step
2,3 the second fracturing section pressure break is completed.Step 2, step 3, step 4 are repeated, the 20th section of pressing crack construction is completed.Slowly bleed off pressure to high pressure
Fracturing string is risen by steel pipe internal pressure 0MPa in coal mine roadway drilling machine, completes the construction of horizontal well water-jet staged fracturing.Pipe
Post design and optimization make tubing string be sent into horizontal well and pull-out activity freely, using drilling machine construction reduce labor intensity,
A time fracturing string can realize n times staged fracturing, and theory unlimited pole segmentation greatly saves the pressure break period.Wherein, N is positive whole
Number.In the construction process, manufacture many cracks can be pinpointed in top plate same level, destroys entire face roof structure,
Extinction in advance, overall effect is obvious, can solve working face deep top plate extinction problem using this method in open-hole horizontal well.Under
Well major diameter tool only has 1 packer, and tripping in success rate is high, and construction success rate is high, long service life.This method is especially suitable
In tight roofs such as coal mine siltstone, carbonate, advanced, economical, reliable top plate outstanding problem can be solved.
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, 22 be silo, and 23 prize for mulling, and C is 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 (8)
1. a kind of method of tight roof horizontal well water-jet staged fracturing in coal mine roadway characterized by comprising
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 hydraulic ejector is directed at the first fracturing section；
Step 2: connection fracturing string is to water injecting pump, when opening water injecting pump suppressed into Steel Tube Special to the first preset value, water
After the packer set of power injector side, water-jet head sprays fracturing liquid to stratum and penetrates out rock, while carrying out annular space
Fluid infusion, water injecting pump continue to inject fracturing fluid to press the first fracturing section；
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: to Steel Tube Special carry out slowly bleed off pressure until Steel Tube Special in pressure reach the second preset value, dragged using drilling machine
Dynamic fracturing string to the second fracturing section, repetition step 2, step 3 completes the fracturing work to the second fracturing section.
2. the method according to claim 1, wherein before the 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, and multiple fracturing sections include the first fracturing section and the second fracturing section.
3. 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.
4. the method according to claim 1, wherein the first preset value is P1, wherein 2MPa≤P1≤3MPa.
5. the method according to claim 1, wherein the second preset value is P2=0MPa.
6. the method according to claim 1, wherein during to open-hole horizontal well pressure break, when needing water
A small amount of fracturing sand is added when power injector head perforation and carries out fracturing work.
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.
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| CN201910324600.6A CN110056353A (en) | 2019-04-22 | 2019-04-22 | The method of tight roof horizontal well water-jet staged fracturing in coal mine roadway |
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| CN201910324600.6A CN110056353A (en) | 2019-04-22 | 2019-04-22 | The method of tight roof horizontal well water-jet staged fracturing in coal mine roadway |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111255463A (en) * | 2020-02-21 | 2020-06-09 | 中煤科工集团西安研究院有限公司 | Hard top plate comb-shaped long drilling segmented fracturing roadway deformation source treatment method |
| CN111456698A (en) * | 2020-04-23 | 2020-07-28 | 太原理工大学 | High-energy impact directional hydraulic fracturing method |
| CN113217099A (en) * | 2021-06-08 | 2021-08-06 | 国能神东煤炭集团有限责任公司 | Hydraulic directional roof cutting device |
| CN116971778A (en) * | 2023-08-15 | 2023-10-31 | 河南理工大学 | Method for preventing and controlling hard roof rock burst of coal mine by ground composite fracturing |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255463A (en) * | 2020-02-21 | 2020-06-09 | 中煤科工集团西安研究院有限公司 | Hard top plate comb-shaped long drilling segmented fracturing roadway deformation source treatment method |
| CN111255463B (en) * | 2020-02-21 | 2021-06-22 | 中煤科工集团西安研究院有限公司 | Hard top plate comb-shaped long drilling segmented fracturing roadway deformation source treatment method |
| CN111456698A (en) * | 2020-04-23 | 2020-07-28 | 太原理工大学 | High-energy impact directional hydraulic fracturing method |
| CN113217099A (en) * | 2021-06-08 | 2021-08-06 | 国能神东煤炭集团有限责任公司 | Hydraulic directional roof cutting device |
| CN113217099B (en) * | 2021-06-08 | 2024-04-05 | 国能神东煤炭集团有限责任公司 | Hydraulic directional top plate cutting device |
| CN116971778A (en) * | 2023-08-15 | 2023-10-31 | 河南理工大学 | Method for preventing and controlling hard roof rock burst of coal mine by ground composite fracturing |
| CN116971778B (en) * | 2023-08-15 | 2024-03-22 | 河南理工大学 | Method for preventing and controlling hard roof rock burst of coal mine by ground composite fracturing |
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Application publication date: 20190726 |