CN106223923A - Coal bed fracturing method - Google Patents
Coal bed fracturing method Download PDFInfo
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- CN106223923A CN106223923A CN201610906232.2A CN201610906232A CN106223923A CN 106223923 A CN106223923 A CN 106223923A CN 201610906232 A CN201610906232 A CN 201610906232A CN 106223923 A CN106223923 A CN 106223923A
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- 239000003245 coal Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 79
- 230000003068 static effect Effects 0.000 claims abstract description 75
- 239000012530 fluid Substances 0.000 claims abstract description 60
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 230000000694 effects Effects 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000003566 sealing material Substances 0.000 claims abstract description 11
- 238000005213 imbibition Methods 0.000 claims abstract description 8
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 229920000159 gelatin Polymers 0.000 claims description 15
- 235000019322 gelatine Nutrition 0.000 claims description 15
- 108010010803 Gelatin Proteins 0.000 claims description 9
- 239000008273 gelatin Substances 0.000 claims description 9
- 235000011852 gelatine desserts Nutrition 0.000 claims description 9
- 239000001828 Gelatine Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 5
- 229910001570 bauxite Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 3
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 claims description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention provides a kind of coal bed fracturing method.The coal bed fracturing method that the present invention provides, including: construction drill on coal seam, with sealing material, above-mentioned boring is carried out sealing of hole, mixing fracturing fluid is injected in boring after above-mentioned sealing of hole, so that above-mentioned coal seam forms fracture network under the effect of above-mentioned mixing fracturing fluid, wherein, above-mentioned mixing fracturing fluid includes fracturing fluid, proppant and static pressure break agent；Above-mentioned static pressure break agent includes shell and the static breaking agent being wrapped in above-mentioned shell；Above-mentioned fracturing fluid to form crack in above-mentioned coal seam, makes above-mentioned proppant and above-mentioned static pressure break agent enter above-mentioned crack for the above-mentioned coal seam of pressure break；Above-mentioned proppant is used for supporting above-mentioned crack；Above-mentioned static breaking agent is discharged in above-mentioned crack after hydrolyzing at above-mentioned shell by above-mentioned static pressure break agent, so that above-mentioned static breaking agent imbibition, extends above-mentioned crack and forms above-mentioned fracture network.The coal bed fracturing method that the present invention provides, fracturing effect is good, and safety is high.
Description
Technical field
The present invention relates to safety of coal mines technology, particularly relate to a kind of coal bed fracturing method.
Background technology
Coal and gas prominent is one of major casualty threatening Safety of Coal Mine Production.At present, mash gas extraction, fall are relied primarily on
The method of low coal seam gas-bearing capacity prevents and treats coal and gas prominent.For hypotonicity coal seam, the extraction efficiency of gas is low, needs
The method relying on pressure break coal seam increases the breathability in coal seam, and then improves the extraction efficiency of gas, with effectively preventing coal with
Gas Outburst.
Existing coal bed fracturing method, mainly includes fracturing coal seam method and deep hole blasting coal seam method.Fracturing coal
Layer method uses the method injecting water under high pressure to coal seam to make coal bed fracturing, and the crack formed in coal seam is easily closed under crustal stress effect
Close, there is the shortcoming that action time is short, fracturing effect is poor.Deep hole blasting coal seam method uses and buries explosive in coal seam underground, and ignites
The method of explosive makes coal bed fracturing, and owing to blast pressure is excessive, and detonation shock easily induces dynamic disaster, there is safety low
Shortcoming.
Summary of the invention
The present invention provides a kind of coal bed fracturing method, during to solve effect that coal bed fracturing method of the prior art exists
Between short, fracturing effect is poor, the problem of poor stability.
The present invention provides a kind of coal bed fracturing method, including:
Construction drill on coal seam；
With sealing material, described boring is carried out sealing of hole；
Mixing fracturing fluid is injected in boring after described sealing of hole, so that described coal seam is under the effect of described mixing fracturing fluid
Forming fracture network, wherein, described mixing fracturing fluid includes fracturing fluid, proppant and static pressure break agent；Described static pressure break agent bag
Include shell and the static breaking agent being wrapped in described shell；Described fracturing fluid is used for coal seam described in pressure break with in described coal seam
Form crack, make described proppant and described static pressure break agent enter described crack；Described proppant is used for supporting described crack；
Described static breaking agent is discharged in described crack after hydrolyzing at described shell by described static pressure break agent, so that described quiet
State cracking agent imbibition, extends described crack and forms described fracture network.
Further, after described sealing material carries out sealing of hole to described boring, described method also includes:
Boring after described sealing of hole is reinforced.
Further, described shell is gelatin shell, and described gelatin is water soluble gelatine, modified gelatin or water soluble gelatine
Polymer.
Further, described static breaking agent is calcium oxide system static breaking agent, magnesium oxide system static breaking agent or silicic acid
Salt system static breaking agent.
Further, described fracturing fluid is potassium chloride saline, activated water, low-resistance activated water, coal seam water or clean fracturing fluid.
Further, described proppant is aluminium silicate system proppant, bauxite system proppant or Zirconium orthosilicate. system proppant.
Further, the sealed borehole length of the boring after described sealing of hole is 15-25m.
Further, described construction drill on coal seam, specifically include:
Layer-through drilling on coal seam, or concordant boring on coal seam.
Further, mixing fracturing fluid is injected in described boring after described sealing of hole, specifically includes:
Use high pressure pump boring after described sealing of hole to inject mixing fracturing fluid, and control described high pressure pump
Liquid filling pressure is 20-40MPa.
The coal bed fracturing method that the present invention provides, by construction drill on coal seam, and with sealing material to above-mentioned boring
Carry out sealing of hole, and then the boring after above-mentioned sealing of hole injects mixing fracturing fluid, so that above-mentioned coal seam is at above-mentioned mixing fracturing fluid
Forming fracture network under effect, wherein, above-mentioned mixing fracturing fluid includes fracturing fluid, proppant and static pressure break agent；Above-mentioned static pressure
Split agent and include shell and the static breaking agent being wrapped in above-mentioned shell；Above-mentioned fracturing fluid is used for the above-mentioned coal seam of pressure break with above-mentioned
Coal seam is formed crack, makes above-mentioned proppant and above-mentioned static pressure break agent enter above-mentioned crack；Above-mentioned proppant is for supporting
State crack；Above-mentioned static breaking agent is discharged in above-mentioned crack after hydrolyzing at above-mentioned shell by above-mentioned static pressure break agent, with
Make above-mentioned static breaking agent imbibition, extend above-mentioned crack and form above-mentioned fracture network.So, by fracturing fluid pressure break coal seam,
Forming crack, proppant supports crack, and static fracture agent extension crack forms fracture network, can not only increase the existence of fracture network
Time, improve fracturing effect, and safety is higher.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is this
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the flow chart of coal bed fracturing embodiment of the method one of the present invention；
The schematic diagram of the boring after the sealing of hole that the coal bed fracturing method that Fig. 2 provides for the application present invention is formed；
The schematic diagram of the fracture network that the coal bed fracturing method that Fig. 3 provides for the application present invention is formed；
Fig. 4 is the schematic diagram that static breaking agent extends crack in crack；
Fig. 5 is the flow chart of coal bed fracturing embodiment of the method two of the present invention；
Fig. 6 is the schematic diagram after the boring after sealing of hole is reinforced by the coal bed fracturing method applying the present invention to provide.
Description of reference numerals:
1: the boring after sealing of hole；
2: sealing material；
3: pipeline；
4: high pressure pump；
5: coal seam；
6: crack；
7: fracture network；
8: proppant；
9: static pressure break agent；
10: becket.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
The present invention provides a kind of coal bed fracturing method, during to solve effect that coal bed fracturing method of the prior art exists
Between short, fracturing effect is poor, the problem of poor stability.
The coal bed fracturing method that the present invention provides, can apply to coal field, the present invention specifically can be applied to provide
Coal bed fracturing method come pressure break coal seam, to improve the permeability in coal seam, improve gas extraction efficiency.
With specifically embodiment, technical scheme is described in detail below.These concrete enforcements below
Example can be combined with each other, and may repeat no more in some embodiment for same or analogous concept or process.
Fig. 1 is the flow chart of coal bed fracturing embodiment of the method one of the present invention；The coal bed fracturing that Fig. 2 provides for the application present invention
The schematic diagram of the boring after the sealing of hole that method is formed.Refer to Fig. 1, the coal bed fracturing method that the present embodiment provides, may include that
S101, on coal seam construction drill.
Specifically, this step, use rig construction drill on coal seam, and rig is positioned at tunnel,
When using rig to hole on coal seam, need to punch to coal seam from lane side.
It should be noted that on coal seam during construction drill, i.e. can on coal seam layer-through drilling, it is also possible on coal seam
Concordant is holed.Wherein, layer-through drilling refers to have passed through the coal seam at initial punch position, reaches other coal seams or rock stratum
Drilling technique.Concordant boring refers to the trend along coal seam or the drilling technique in tendency direction.
S102, with sealing material, above-mentioned boring is carried out sealing of hole.
In this step, for avoiding to liquid is injected in boring when, liquid flows out from operating side, uses hole sealing device to brill
Hole carries out sealing of hole.Refer to Fig. 2, after book step, form the boring 1 after sealing of hole as shown in Figure 2.
Specifically, sealing material can be cement mortar, timber wedge yellow mud, polyurethane foam etc..
It should be noted that in the present embodiment, the sealed borehole length of the boring after sealing of hole is 15-25m.
S103, boring after above-mentioned sealing of hole inject mixing fracturing fluid, so that above-mentioned coal seam is at above-mentioned mixing fracturing fluid
Forming fracture network under effect, wherein, above-mentioned mixing fracturing fluid includes fracturing fluid, proppant and static pressure break agent；Above-mentioned static pressure
Split agent and include shell and the static breaking agent being wrapped in above-mentioned shell；Above-mentioned fracturing fluid is used for the above-mentioned coal seam of pressure break with above-mentioned
Coal seam is formed crack, makes above-mentioned proppant and above-mentioned static pressure break agent enter above-mentioned crack；Above-mentioned proppant is for supporting
State crack；Above-mentioned static breaking agent is discharged in above-mentioned crack after hydrolyzing at above-mentioned shell by above-mentioned static pressure break agent, with
Make above-mentioned static breaking agent imbibition, extend above-mentioned crack and form above-mentioned fracture network.
Specifically, as in figure 2 it is shown, use the high pressure pump 4 boring 1 after sealing of hole to inject mixing fracturing fluid.And to
During mixing fracturing fluid is injected in boring 1 after sealing of hole, the liquid filling pressure controlling high pressure pump 4 is 20-40MPa.
Additionally, in the present embodiment, fracturing fluid can be aqueous fracturing fluid body.Such as, fracturing fluid is potassium chloride saline, activity
Water, low-resistance activated water, coal seam water or clean fracturing fluid.
Proppant is to have certain particle size and the natural sand of grating or artificial high-strength ceramic granule.In the present embodiment,
Support agent is acid aluminum system proppant, bauxite system proppant or Zirconium orthosilicate. system proppant.
It should be noted that static pressure break agent shell has slowly water suction, expands the character softened.In the present embodiment, quiet
State pressure break agent shell is gelatin shell, and this gelatin is water soluble gelatine, modified gelatin or water soluble gelatine polymer.
Static breaking agent then refers to the broken pulverulent material of non-explosion with highly expanded performance.In the present embodiment, quiet
State cracking agent is calcium oxide system static breaking agent, magnesium oxide system static breaking agent or silicate static breaking agent.
The schematic diagram of the fracture network that the coal bed fracturing method that Fig. 3 provides for the application present invention is formed；Fig. 4 is static breaking agent
The schematic diagram in crack is extended in crack.The coal bed fracturing that the application present invention provides simply is introduced below in conjunction with Fig. 3 and Fig. 4
The principle in method pressure break coal seam.
Specifically, please also refer to Fig. 3, when high pressure pump 4 by mixing fracturing fluid with the pressure more than coal seam 5 absorbability
When being injected into the boring 1 after sealing of hole, the injection of mixing fracturing fluid make sealing of hole after boring in pressure in 1 gradually rise, work as envelope
When the pressure in boring 1 behind hole is more than the tensile strength of the crustal stress near hole wall and formation rock, fracturing fluid pressure break coal seam
1, coal seam 1 is formed crack 6, now, refer to Fig. 4, proppant 8 and static pressure break agent 9 and enter crack 6, proppant 8 is supported on
In crack 6, prevent crack from closing under the effect of crustal stress, the shell of static pressure break agent 9 the most slowly absorbs water, expand softening,
And then hydrolysis, after shell hydrolyzes, the static breaking agent being wrapped in above-mentioned shell is released in crack 6 by static pressure break agent 9,
So, static fracture agent is exposed to mix in fracturing fluid, static breaking agent imbibition, and further pressure break crack 6 makes above-mentioned splitting
Gap extends, and so, by fracturing fluid and the repeated action of static pressure break agent, makes above-mentioned crack 6 form the crack that development degree is good
Net 7.
The coal bed fracturing method that the present invention provides, in fracturing fluid pressure break coal seam, when forming crack, not only by support
Agent supports crack, it is to avoid crack closes under the effect of crustal stress, improves the action effect of fracturing fluid, extends the existence in crack
Time, improve fracturing effect.Further pressure break crack can also be come by static pressure break agent, improve fracturing effect further.This
Outward, the coal bed fracturing method that the present invention provides, owing to static fracture agent is non-explosivity material, therefore, is improving fracturing effect
While, safety is the highest.
The coal bed fracturing method that the present invention provides, by construction drill on coal seam, and with sealing material to above-mentioned boring
Carry out sealing of hole, and then the boring after above-mentioned sealing of hole injects mixing fracturing fluid, so that above-mentioned coal seam is at above-mentioned mixing fracturing fluid
Forming fracture network under effect, wherein, above-mentioned mixing fracturing fluid includes fracturing fluid, proppant and static pressure break agent；Above-mentioned static pressure
Split agent and include shell and the static breaking agent being wrapped in above-mentioned shell；Above-mentioned fracturing fluid is used for the above-mentioned coal seam of pressure break with above-mentioned
Coal seam is formed crack, makes above-mentioned proppant and above-mentioned static pressure break agent enter above-mentioned crack；Above-mentioned proppant is for supporting
State crack；Above-mentioned static breaking agent is discharged in above-mentioned crack after hydrolyzing at above-mentioned shell by above-mentioned static pressure break agent, with
Make above-mentioned static breaking agent imbibition, extend above-mentioned crack and form above-mentioned fracture network.So, by fracturing fluid pressure break coal seam,
Forming crack, proppant supports crack, and static fracture agent extension crack forms fracture network, can not only increase the existence of fracture network
Time, improve fracturing effect, and safety is higher.
Fig. 5 is the flow chart of coal bed fracturing embodiment of the method two of the present invention.The coal bed fracturing that Fig. 6 provides for the application present invention
Method the boring after sealing of hole is reinforced after schematic diagram.Refer to Fig. 5, the coal bed fracturing method that the present embodiment provides, can
To comprise the steps:
S201, on coal seam construction drill.
Specifically, the concrete methods of realizing of this step and realize principle and may refer to the retouching of step S101 of embodiment one
State, do not repeat them here.
S202, with sealing material, above-mentioned boring is carried out sealing of hole.
Specifically, the concrete methods of realizing of this step and realize principle and may refer to the retouching of step S102 of embodiment one
State, do not repeat them here.
S203, the boring after above-mentioned sealing of hole is reinforced.
Specifically, refer to Fig. 6, the boring 1 after sealing of hole is reinforced and specifically refers to the boring after sealing of hole 1 near behaviour
Cover a becket 10 on the outer wall of one end of author, utilize this becket 10 boring 1 after sealing of hole to be reinforced, to carry
The resistance to pressure of the boring 1 after high sealing of hole.
S204, boring after above-mentioned sealing of hole inject mixing fracturing fluid, so that above-mentioned coal seam is at above-mentioned mixing fracturing fluid
Forming fracture network under effect, wherein, above-mentioned mixing fracturing fluid includes fracturing fluid, proppant and static pressure break agent；Above-mentioned static pressure
Split agent and include shell and the static breaking agent being wrapped in above-mentioned shell；Above-mentioned fracturing fluid is used for the above-mentioned coal seam of pressure break with above-mentioned
Coal seam is formed crack, makes above-mentioned proppant and above-mentioned static pressure break agent enter above-mentioned crack；Above-mentioned proppant is for supporting
State crack；Above-mentioned static breaking agent is discharged in above-mentioned crack after hydrolyzing at above-mentioned shell by above-mentioned static pressure break agent, with
Make above-mentioned static breaking agent imbibition, extend above-mentioned crack and form above-mentioned fracture network.
Specifically, the concrete methods of realizing of this step and realize principle and may refer to the retouching of step S103 of embodiment one
State, do not repeat them here.
The coal bed fracturing method that the present embodiment provides, by reinforcing the boring after sealing of hole, after can improving sealing of hole
The stability of boring, it is to avoid the boring after sealing of hole is damaged under the effect of the mixing fracturing fluid of high pressure, can further improve peace
Quan Xing.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to foregoing embodiments, it will be understood by those within the art that: it depends on
So the technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is entered
Row equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (9)
1. a coal bed fracturing method, it is characterised in that including:
Construction drill on coal seam；
With sealing material, described boring is carried out sealing of hole；
Mixing fracturing fluid is injected in boring after described sealing of hole, so that described coal seam is formed under the effect of described mixing fracturing fluid
Fracture network, wherein, described mixing fracturing fluid includes fracturing fluid, proppant and static pressure break agent；Outside described static pressure break agent includes
Shell and the static breaking agent being wrapped in described shell；Described fracturing fluid is used for coal seam described in pressure break to be formed in described coal seam
Crack, makes described proppant and described static pressure break agent enter described crack；Described proppant is used for supporting described crack；Described
Described static breaking agent is discharged in described crack after hydrolyzing at described shell by static pressure break agent, so that described static state is broken
Broken dose of imbibition, extends described crack and forms described fracture network.
Coal bed fracturing method the most according to claim 1, it is characterised in that described boring is carried out by described sealing material
After sealing of hole, described method also includes:
Boring after described sealing of hole is reinforced.
Coal bed fracturing method the most according to claim 1, it is characterised in that described shell is gelatin shell, described gelatin
For water soluble gelatine, modified gelatin or water soluble gelatine polymer.
Coal bed fracturing method the most according to claim 1, it is characterised in that described static breaking agent is that calcium oxide system is static
Cracking agent, magnesium oxide system static breaking agent or silicate static breaking agent.
5. according to the coal bed fracturing method described in any one of claim 1-4, it is characterised in that described fracturing fluid is potassium chloride salt
Water, activated water, low-resistance activated water, coal seam water or clean fracturing fluid.
Coal bed fracturing method the most according to claim 5, it is characterised in that described proppant be aluminium silicate system proppant,
Bauxite system proppant or Zirconium orthosilicate. system proppant.
Coal bed fracturing method the most according to claim 6, it is characterised in that the sealed borehole length of the boring after described sealing of hole is
15-25m。
Coal bed fracturing method the most according to claim 7, it is characterised in that described construction drill on coal seam, specifically wraps
Include:
Layer-through drilling on coal seam, or concordant boring on coal seam.
Coal bed fracturing method the most according to claim 8, it is characterised in that described boring after described sealing of hole is injected mixed
Close fracturing fluid, specifically include:
Use high pressure pump boring after described sealing of hole to inject mixing fracturing fluid, and control the fluid injection of described high pressure pump
Pressure is 20-40MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610906232.2A CN106223923B (en) | 2016-10-17 | 2016-10-17 | Coal bed fracturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610906232.2A CN106223923B (en) | 2016-10-17 | 2016-10-17 | Coal bed fracturing method |
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| Publication Number | Publication Date |
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| CN106223923A true CN106223923A (en) | 2016-12-14 |
| CN106223923B CN106223923B (en) | 2019-03-19 |
Family
ID=58076469
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|---|---|---|---|
| CN201610906232.2A Active CN106223923B (en) | 2016-10-17 | 2016-10-17 | Coal bed fracturing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441421A (en) * | 2018-11-16 | 2019-03-08 | 中国海洋石油集团有限公司 | A method of strengthening waterpower percussive pressure and splits fracturing effect |
| CN109519209A (en) * | 2018-10-25 | 2019-03-26 | 平顶山天安煤业股份有限公司 | A kind of fracturing process and device improving coal mine gas drainage effect |
| CN110261235A (en) * | 2019-07-05 | 2019-09-20 | 山东科技大学 | Crack country rock anchoring property damage measure device and test method |
| CN111022021A (en) * | 2020-01-02 | 2020-04-17 | 吉林大学 | Oil shale in-situ heating method for coping with thermal expansion characteristics of oil shale formation |
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| CN109441421B (en) * | 2018-11-16 | 2021-05-14 | 中国海洋石油集团有限公司 | Method for enhancing hydraulic impact fracturing effect |
| CN110261235A (en) * | 2019-07-05 | 2019-09-20 | 山东科技大学 | Crack country rock anchoring property damage measure device and test method |
| CN110261235B (en) * | 2019-07-05 | 2022-07-08 | 山东科技大学 | Fracture surrounding rock anchoring performance damage testing device and testing method |
| CN111022021A (en) * | 2020-01-02 | 2020-04-17 | 吉林大学 | Oil shale in-situ heating method for coping with thermal expansion characteristics of oil shale formation |
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