CN105114116B - A kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method - Google Patents

A kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method Download PDF

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CN105114116B
CN105114116B CN201510458809.3A CN201510458809A CN105114116B CN 105114116 B CN105114116 B CN 105114116B CN 201510458809 A CN201510458809 A CN 201510458809A CN 105114116 B CN105114116 B CN 105114116B
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pressure break
hole
branch
break hole
powder
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CN105114116A (en
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倪冠华
程卫民
王刚
刘震
于岩斌
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/2405Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures

Abstract

A kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method disclosed by the invention, constructed successively on the lane side of coal seam first main pressure break hole, branch's pressure break hole and bullport, main pressure break hole is arranged in an equilateral triangle center position, the position of opening in branch's pressure break hole is arranged in three apexes of the equilateral triangle, its borehole bottom location is met at the equilateral triangle center line, bullport is in using main pressure break hole as the center of circle, and radius is on 5~15m circle;Fracturing unit includes the water injection equipment being made up of intelligent water tank, fracturing pump and note powder device forms.The calcium lime powder noted in powder device is injected in main pressure break hole and branch's pressure break hole by underground blast;Hydraulic fracturing is carried out to main pressure break hole by water injection equipment, calcium lime powder enters crack under the carrying of water under high pressure, while the substantial amounts of heat of thermal response generation occurs for calcium lime powder and moisture, realizes hydrothermal reaction coupling pressure break;By implementing hydrothermal reaction coupling pressure break strengthening region gas pumping method, the increase of pressure break influence area, the increase of mash gas extraction concentration, significant effect, the requirements of one's work such as colliery scene regional gas control are met.

Description

A kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method
Technical field
The present invention relates to a kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method, belongs to underground coal mine region gas and controls Technical field is managed, is particularly suitable for use in the hydrothermal reaction coupling fracturing work of the projecting coal bed middle regional gas control of deep high methane.
Background technology
Chinese Academy of Engineering《National energy development strategy 2030~2050》Report proposes that the year two thousand fifty coal annual production control exists 3000000000 tons, coal is using for a long time as the leading energy in China.But China Mine Geological complicated condition, high gas layer account for 50%-70%, and high gassy and low permeability coal seam accounts for therein 70% or so.China's high gassy and low permeability coal seam preservation is special Sign is micropore property, low-permeability and high adsorption, causes to be usually associated with a large amount of Gas in recovery process, particularly With the high-efficiency intensifying of coal production and the increase of mining depth, gas emission is increasing, and gas explosion and gas are dashed forward The threat for going out danger is increasingly severe.Therefore, colliery often needs to carry out regional gas control operation, waterpower pressure in recovery process The technology of splitting is one of major measure of oil output, and certain effect is also achieved in the application of underground coal mine.
However, existing coal seam hydraulic fracture technology is present, technique effect is unstable, release is insufficient, extraction efficiency is low etc. Phenomenon, it is not only time-consuming, workload is big, and it is dangerous it is high, cost is high.Traditional hydraulic fracturing technology is primarily due to split Gap extension is insufficient, is not carried out the Fracture Networks in region.Moreover, the presence of moisture is sealed after the implementation of conventional hydraulic fracturing technique Blocked up the passage of Gas Flow, produced and suppress desorption of mash gas, diffusion and the effect of infiltration, cause hydraulic fracturing technology gradually by Limitation.Therefore, in order to solve existing hydraulic fracturing technology defect, it is badly in need of a kind of new fracturing technique method, to meet colliery The requirements of one's work such as field regions gas preventing and control.With reference to and draw the advantage of existing hydraulic fracturing, use for reference heating and promote gas solution The thinking of suction, increase pressure break after gas desorption quantity, the plugging action for reducing moisture after pressure break, produced using rational drilling arrangement Region Fracture Networks, form hydrothermal reaction coupling pressure break and strengthen gas pumping technical method.
The content of the invention
Technical problem:The purpose of the present invention is to be directed in high gassy and low permeability coal seam in existing hydraulic fracturing technology not Foot part, there is provided a kind of pressure break influence area is big, and desorption of mash gas amount is big, and gas pumping effect is obvious, success rate is high, cost is low Hydrothermal reaction coupling pressure break strengthening region gas pumping method.
Technical scheme:
Hydrothermal reaction coupling pressure break strengthening region gas pumping method of the present invention, it is characterised in that comprise the following steps:
A. construct main pressure break hole successively in coal seam lane side and three branch's pressure break holes, main pressure break hole are arranged in one equilateral three Angular center position, the position of opening in three branch's pressure break holes are arranged in three apexes of the equilateral triangle, and three The borehole bottom location in individual branch's pressure break hole is met at the equilateral triangle center line, is formed using the equilateral triangle bottom of as, to divide Branch pressure break hole is the positive triangular pyramid of seamed edge, main pressure break hole, three branch's pressure break holes is penetrated in coal seam, and main pressure break hole is with dividing The spacing in branch pressure break hole is 2~3m;
B. in 5~15m opening positions, four bullports of construction apart from main pressure break hole, four bullports are made to be in main pressure break Hole is the center of circle, and radius is on 5~15m circle;
C. fracturing unit is connected in main pressure break hole aperture, the fracturing unit includes being made up of intelligent water tank, fracturing pump Water injection equipment and note powder device composition.The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway, threeway Outlet be connected through high-pressure rubber pipe with pressure break pipe, the outlet pipe of water injection equipment, note be respectively equipped with the flour extraction pipe of powder device it is unidirectional Valve;
D. borehole sealing is carried out to main pressure break hole, branch's pressure break hole and bullport using conventional method for sealing successively;
E. a certain amount of calcium lime powder is added into note powder device, is injected the calcium lime powder noted in powder device by underground blast In main pressure break hole, when all branch's pressure break holes all go out powder, stop note powder;
F. fracturing pump is opened, hydraulic fracturing is carried out to main pressure break hole by water injection equipment, in main pressure break hole and branch's pressure break Crack is produced around hole, calcium lime powder enters crack under the carrying of water under high pressure, while thermal response occurs for calcium lime powder and moisture The substantial amounts of heat of generation, realizes hydrothermal reaction coupling pressure break;
G. repeat step e, f, when water outflow all occur in four bullports, stop hydrothermal reaction coupling pressure break, remove pressure break Equipment, main pressure break hole, branch's pressure break hole and bullport are connected to gas drainage pipe network, carry out gas pumping.
Beneficial effect:By adopting the above-described technical solution, solving existing hydraulic fracturing technology defect, coal seam is realized Hydrothermal reaction coupling pressure break, promote the development of coal body internal crack, extension and insertion, the increase of pressure break influence area;Temperature rise promotes Desorption of mash gas, the increase pressure break after gas desorption quantity of high adsorption;Moisture reacts with calcium lime powder, and moisture reduces, and reduces The plugging action of moisture after pressure break.By implementing hydrothermal reaction coupling pressure break strengthening region gas pumping method, mash gas extraction concentration increases Greatly, cost is low, significant effect, meets the requirements of one's work such as colliery scene regional gas control.
Brief description of the drawings
Fig. 1 is the hydrothermal reaction coupling pressure break strengthening region gas pumping method borehole pattern of the present invention.
Fig. 2 is the hydrothermal reaction coupling pressure break strengthening region gas pumping method embodiment schematic diagram of the present invention.
In figure:1-lane side, 2-main pressure break hole, 3-branch pressure break hole, 4-bullport, 5-intelligent water tank, 6-pressure break Pump, 7-high-pressure rubber pipe, 8-1-check valve, 8-2-check valve, 9-valve, 10-threeway, 11-pressure break pipe, 12-note powder Device, 13-calcium lime powder, 14-crack.
Embodiment:
The specific embodiment of the invention is further described below in conjunction with the accompanying drawings:
Shown in Fig. 1 and Fig. 2, a kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method:First, on coal seam lane side 1 To construct successively main pressure break hole 2 and three branch's pressure break holes 3, main pressure break hole 2 is arranged in an equilateral triangle center position, and three The position of opening in individual branch's pressure break hole 3 is arranged in three apexes of the equilateral triangle, the end in three branch's pressure break holes 3 Hole site is met at the equilateral triangle center line, is formed using the equilateral triangle bottom of as, is seamed edge with branch's pressure break hole 3 Positive triangular pyramid, main 2, three branch's pressure break holes 3 in pressure break hole are made to be penetrated in coal seam, main pressure break hole 2 is opened with branch's pressure break hole 3 Pitch of holes is 2~3m;In 5~15m opening positions, four bullports 4 of construction apart from main pressure break hole 2, it is in four bullports 4 It is the center of circle with main pressure break hole 2, radius is on 5~15m circle;Fracturing unit, the fracturing unit are connected in the main aperture of pressure break hole 2 Formed including the water injection equipment being made up of intelligent water tank 5, fracturing pump 6 and note powder device 12.The outlet pipe and note powder device of water injection equipment Flour extraction pipe linked together by threeway 10, the outlet of threeway 10 is connected through high-pressure rubber pipe 7 with pressure break pipe 11, water injection equipment Outlet pipe, note powder device 12 flour extraction pipe on be respectively equipped with check valve 8-1 and check valve 8-2;Using routine method for sealing according to It is secondary that borehole sealing is carried out to main pressure break hole 2, branch's pressure break hole 3 and bullport 4;A certain amount of quick lime is added into note powder device 12 Powder 13, the calcium lime powder 13 noted in powder device 12 is injected in main pressure break hole 2 by underground blast, treats that all branch's pressure break holes 3 are complete When portion goes out powder, stop note powder;Fracturing pump 6 is opened, hydraulic fracturing is carried out to main pressure break hole 2 by water injection equipment, in main pressure break hole 2 Crack 14 is produced with the surrounding of branch's pressure break hole 3, calcium lime powder 13 enters crack 14, while calcium lime powder under the carrying of water under high pressure 13 and moisture the substantial amounts of heat of thermal response generation occurs, realize hydrothermal reaction coupling pressure break, temperature raises the gas for promoting high adsorption Desorption, increase pressure break after gas desorption quantity;Moisture reacts with calcium lime powder, and moisture reduces, and reduces the envelope of moisture after pressure break Stifled effect;When four bullports 4 all water outflow occur, stop hydrothermal reaction coupling pressure break, fracturing unit is removed, by main pressure break hole 2nd, branch's pressure break hole 3 and bullport 4 are connected to gas drainage pipe network, carry out gas pumping.Strengthened by implementing hydrothermal reaction coupling pressure break Region gas pumping method, solve existing hydraulic fracturing technology defect, realize coal seam hydrothermal reaction coupling pressure break, promote in coal body Portion's cranny development, extension and insertion, the increase of mash gas extraction concentration, cost is low, significant effect, meets colliery scene region gas The requirements of one's work such as improvement.

Claims (2)

1. a kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method, it is characterised in that comprise the following steps:
A. constructed successively main pressure break hole (2) and three branch's pressure break holes (3) in coal seam lane side (1), main pressure break hole (2) is arranged in one Individual equilateral triangle center position, the position of opening of three branch's pressure break holes (3) are arranged in the three of the equilateral triangle Individual apex, the borehole bottom location of three branch's pressure break holes (3) are met at the equilateral triangle center line, make main pressure break hole (2), Three branch's pressure break holes (3) penetrate in coal seam, and main pressure break hole (2) and the spacing in branch's pressure break hole (3) are 2~3m;
B. apart from the main 5~15m opening positions of pressure break hole (2) four bullports (4) of construction, four bullports (4) are made to be in master Pressure break hole (2) is the center of circle, and radius is on 5~15m circle;
C. fracturing unit is connected in main pressure break hole (2) aperture, the fracturing unit is made up of intelligent water tank (5), fracturing pump (6) Water injection equipment and note powder device (12) composition, the outlet pipe of water injection equipment and the flour extraction pipe of note powder device are connected to one by threeway (10) Rise, the outlet of threeway (10) is connected through high-pressure rubber pipe (7) with pressure break pipe (11), outlet pipe, the note powder device (12) of water injection equipment Flour extraction pipe on be respectively equipped with check valve one (8-1) and check valve two (8-2);
D. using conventional method for sealing successively main pressure break hole (2), branch's pressure break hole (3) and bullport (4) drill it is close Envelope;
E. a certain amount of calcium lime powder (13) is added into note powder device (12), the life stone in powder device (12) will be noted by underground blast Ashes (13) is injected in main pressure break hole (2), when all branch's pressure break holes (3) all go out powder, stops note powder;
F. fracturing pump (6) is opened, hydraulic fracturing is carried out to main pressure break hole (2) by water injection equipment, in main pressure break hole (2) and branch Crack (14) are produced around pressure break hole (3), calcium lime powder (13) enters crack (14) under the carrying of water under high pressure, while quick lime The substantial amounts of heat of thermal response generation occurs for powder (13) and moisture, realizes hydrothermal reaction coupling pressure break;
G. repeat step e, f, when four bullports (4) all water outflow occur, stop hydrothermal reaction coupling pressure break, remove pressure break and set It is standby, main pressure break hole (2), branch's pressure break hole (3) and bullport (4) are connected to gas drainage pipe network, carry out gas pumping.
2. hydrothermal reaction coupling pressure break strengthening region gas pumping method according to claim 1, it is characterised in that:Pressure break pipe (11) it is total for the seamless steel pipe of even tube wall arrangement aperture, hole diameter 10mm, a diameter of 25mm of seamless steel pipe, seamless steel pipe Length is 30m.
CN201510458809.3A 2015-07-30 2015-07-30 A kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method Active CN105114116B (en)

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Publication number Priority date Publication date Assignee Title
CN105525901B (en) * 2015-12-29 2017-10-24 中国矿业大学 A kind of coal seam hydraulic fracture reinforcing anti-reflection method based on microwave irradiation
CN105484720B (en) * 2015-12-29 2017-10-24 中国矿业大学 The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing
CN105673067B (en) * 2016-03-07 2018-02-13 中国矿业大学 A kind of hydraulic fracturing and the device and method of the combined reinforced draining coal seam gas of microwave radiation
CN107842350B (en) * 2017-11-07 2019-08-02 河南理工大学 A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine
CN107975359B (en) * 2017-11-23 2019-12-03 山东科技大学 A kind of anti-disaster method of coal-bed flooding based on seawater corrosion
CN108708765B (en) * 2018-04-13 2019-09-06 山东科技大学 One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance
CN108643878B (en) * 2018-04-13 2020-03-10 山东科技大学 High-temperature disturbance strengthened acidizing and fracturing area gas extraction method

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