CN101709629B - Reverse circulation aerodynamic cavitation method for coalbed methane well and equipment - Google Patents
Reverse circulation aerodynamic cavitation method for coalbed methane well and equipment Download PDFInfo
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- CN101709629B CN101709629B CN2009101725587A CN200910172558A CN101709629B CN 101709629 B CN101709629 B CN 101709629B CN 2009101725587 A CN2009101725587 A CN 2009101725587A CN 200910172558 A CN200910172558 A CN 200910172558A CN 101709629 B CN101709629 B CN 101709629B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title abstract description 6
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002817 coal dust Substances 0.000 claims abstract description 8
- 239000006260 foam Substances 0.000 claims abstract description 8
- 239000011435 rock Substances 0.000 claims abstract description 7
- 239000003245 coal Substances 0.000 claims description 49
- 238000005259 measurement Methods 0.000 claims description 12
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 210000002445 nipple Anatomy 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 241000628997 Flos Species 0.000 claims description 2
- 230000003442 weekly effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 238000005406 washing Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract 3
- 239000007789 gas Substances 0.000 description 55
- 230000000694 effects Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses a reverse circulation aerodynamic cavitation method for a coalbed methane well and equipment. The reverse circulation aerodynamic cavitation method comprises the following steps of: arranging wellhead equipment on a wellhead and sinking a working pipe to a bottom hole; clearly eliminating rock coal dust and water inside the well by using an air compressor in a circulating way; then lifting the working pipe upwards and injecting air/foam by using the air compressor and a supercharger, wherein the air injecting pressure is 3-15 MPa; meanwhile continuously injecting atomized water into the well with the water injecting amount of 3.0-5.0 m<3> each time; opening a hydraulic flat plate gate valve for discharging; after discharging, sinking the working pipe to a coalbed part; injecting the air simultaneously by the air compressor and the supercharger; meanwhile injecting water/foam with the amount of 3.0-10.0 m<3> by using an injection pump for washing the well to the bottom hole; after completing one cycle of discharging and well washing, detecting initial data; closing the air compressor, the supercharger, the injection pump and the hydraulic flat plate gate valve to enable gas inside the well to return freely; measuring the change of gas output of coalbed gas in one hour by using a flow meter; and placing a torch at a discharge port to ignite the gas. The invention improves the construction safety, improves the yield of single well coalbed gas, and saves the construction cost.
Description
Technical field
The invention belongs to coal bed gas well completion technique field, what relate generally to is a kind of reverse circulation aerodynamic cavitation method and equipment of coal bed gas well.
Background technology
In explored coal reserves, low-order coal, cracked coal and soft seam occupy quite great proportion, and contain in the coal seam to enrich coal bed gas (main component is a gas) be the main potential safety hazard of coal mining, be again a kind of novel clear energy sources.The perforation that adopts at present, the pressure break row technology of adopting be for the low order coal seam, and because of its closure strength is low, the formed crack of pressure break is prone to again closed and can not reaches row and adopt purpose.For cracked coal, crack mainly along weak structural plane development in the coal seam, because of there being the particulate coal dust in the structural plane, is prone to stop up the formed crack of pressure break, adopts purpose so be difficult to reach row; Machinery cave completion row excavating technology, little because of the cave of its formation, the coal seam surface area that is exposed is little, and the coal seam permeability is low in addition, can not realize that the row of low-order coal and cracked coal adopts purpose; Construction level Multilateral Wells risk is very big in low-order coal and cracked coal seam, mainly is that the coal seam is soft, broken, and the generation drilling failure that is prone to cave in can't realize the coal-bed gas exploitation in low order coal seam and cracked coal seam.
Summary of the invention
Task of the present invention is reverse circulation aerodynamic cavitation method and the equipment that proposes a kind of coal bed gas well.Efficiently solve the technical barrier of cracked coal, soft seam and low-order coal coal-bed gas exploitation, improved safety of construction, the individual well methane output is increased, saved construction cost.
The present invention realizes that the technical scheme that above-mentioned purpose is taked is: at well head wellhead assembly is installed; Be lowered to instrumentation tubes to the shaft bottom,, put forward instrumentation tubes on then with rock coal/powder in the clean well of air compressor machine loop cleaning and water; Inject air/foam with air compressor machine and supercharger; Gas injection pressure 3～15MPa, water filling continuously/atomizing in well simultaneously, the each 3.0～5.0m of water injection rate
3, open the hydraulic flat gate valve open flow then, after open flow finished, down to the position, coal seam, air compressor machine and supercharger moved the injection air simultaneously with instrumentation tubes, use grouting pump water filling/foam 3.0～10.0m simultaneously
3Carry out well-flushing to the shaft bottom.
The present invention realizes that the equipment that said method adopts is on the well head casing head, to connect a pipe nipple; On this pipe nipple, connect end flange, bottom four-way, preventer, doughnut-shaped steel plate, top four-way, blind plate successively; The left side port of bottom four-way connect with the measurement of discharge pipeline and be provided with flashboard valve at point of attachment, the right side port connects with an end of gas injection pipeline; And be provided with flashboard valve at point of attachment; On the measurement of discharge pipeline, gas flow meter is installed; The other end of gas injection pipeline connects with kill manifold, and this kill manifold connects with high-pressure injection pump, release pipeline, supercharger, air compressor machine through gas injection pipeline, Highpressure Tee, one-way cock and flashboard valve successively, on kill manifold, also is connected with active redundancy pipeline; The left side port of top four-way connects with relief line, and is provided with the hydraulic gate valve door and manually-operated gate, right side port are connected with pressure meter and flashboard valve at point of attachment; Preventer is connected with the control cabinet that surges respectively with the valve that surges.
The present invention makes coal bed gas well form the cave on every side through adopting anti-circulation to make cave technology, increases coal seam exposed area and external crack opening degree, and then increases the output of coal bed gas.Through injecting gases at high pressure, enlarged the coal seam internal crack, and the crack extended distance is increased, improve the connectedness in crack, dredge the passage that coal bed gas is overflowed effectively, to improve the output of coal bed gas.Through optimizing the open flow channel design, install moistening cooling system additional, reduce the Compressed Gas temperature, wetting ejection particle reduces gas ejection resistance, reduces the possibility of gas (coal dust) blast (burning).Pass through under instrumentation tubes; Reduce in the open flow process since the high pressure action of turbulent flow produce to the effect of wall casing impact damage, simultaneously, collapse when collapsing coal seam or top board large tracts of land occurring; Can be effectively at the protection borehole wall; Reduce the possibility that pit shaft is scrapped, in the time of also can avoiding open flow or well-flushing on the other hand instrumentation tubes and the stuck caused pit shaft of wall casing are scrapped, improve safety of construction greatly.
It has following characteristics:
(1) have open flow speed fast, produce that the crack is effective, coal bed gas overflow abundant, duration of well flushing is short, well washing effect good, make distinguishing feature such as cave efficient height.
(2) aerodynamic cave gas, coal-dust explosion problem have been solved.
(3) solved effectively in the past in the aerodynamic cave that working column damages and drilling tool such as scraps at problem.
(4) solved because the well head gas density transfinites, and the person and health hazard problem that the operating personnel is caused.
(5) Billy makes the cave with nitrogen and has saved construction cost greatly.
Description of drawings
Accompanying drawing is the present device device and connects sketch map.
Among the figure: 1, blind plate, 2, flashboard valve, 3, pressure meter, 4, the hydraulic gate valve door, 5, the manually gate valve door, 6, relief line; 7, the control cabinet that surges, 8, doughnut-shaped steel plate, 9, the top four-way, 10, preventer, 11, gas flow meter, 12, the measurement of discharge pipeline; 13, flashboard valve, 14, the bottom four-way, 15, end flange, 16, casing head, 17, pipe nipple, 18, flashboard valve; 19, gas injection pipeline, 20, kill manifold, 21, the gas injection pipeline, 22, high-pressure injection pump, 23, supercharger, 24, air compressor machine; 25, air compressor machine, 26, one-way cock, 27, active redundancy pipeline, 28, Highpressure Tee, 29, flashboard valve, 30, the release pipeline.
The specific embodiment
In conjunction with accompanying drawing, it is following to provide specific embodiment of the present invention, but the present invention does not limit to following examples.As shown in the figure, present embodiment is the coal bed gas well reverse circulation aerodynamic cavitation equipment of mainly being made up of supercharger 23, air compressor machine 24,25, preventer 10, top four-way 9, bottom four-way 14, high-pressure injection pump 22, kill manifold 20, hydraulic gate valve door 4 and pipeline, valve etc. of on well head casing head 16, installing.Concrete method of attachment is following:
Connect a pipe nipple 17 on the well head casing head 16, on this pipe nipple, connect end flange 15, bottom four-way 14, preventer 10, doughnut-shaped steel plate 8, top four-way 9, blind plate 1 successively; The left side port of bottom four-way 14 connects with measurement of discharge pipeline 12; And be provided with flashboard valve 13 at point of attachment, the right side port connects with gas injection pipeline 19; And be provided with flashboard valve 18 at point of attachment; Gas flow meter 11 is installed on the measurement of discharge pipeline; Gas injection pipeline 19 connects with kill manifold 20, and kill manifold 20 connects with high-pressure injection pump 22, release pipeline 30, supercharger 23, air compressor machine 24 and air compressor machine 25 through gas injection pipeline 21, Highpressure Tee 28, one-way cock 26 and flashboard valve 29 successively.On kill manifold 20, also be connected with active redundancy pipeline 27, its effect is: 1, be that each process discharges well inner high voltage gas usefulness; 2, be when producing the high pressure fuel gas, to mend water pump slip casting kill-job to use.The left side port of top four-way 9 connects with relief line 6, and is provided with hydraulic gate valve door 4 at point of attachment and is connected with pressure meter 3 and flashboard valve 2 with manually-operated gate 5, right side port.What preventer 10 adopted is known products, and like 2FZ23-35 or 2FZ23-21, effect is to use for preventing to produce the ejection of high pressure fuel gas).The valve 4 that surges is connected with the control cabinet 7 that surges respectively, and the control cabinet 7 that surges is used for controlling surge valve 4 and preventer 10 actions, and the control circuit of employing is conventional control circuit.
The course of work of the present invention is following:
1, installs, connected the said equipment at well head casing head 16.
2, start air compressor machine 24,25, supercharger 23, carry out the apparatus pressure testing, check its tightness, safety.
3, be lowered to instrumentation tubes to the shaft bottom,, carry instrumentation tubes to production casing (before making the cave G.I.H) 5～10m more than the end mouth on then, hang on the doughnut-shaped steel plate 8 with rock (coal) powder in the clean well of air compressor machine (driving supercharger in case of necessity) loop cleaning and water.
4, make the cave operation
The reverse circulation aerodynamic cavitation method of the said coal bed gas well of present embodiment is: with gas injection (water), the pressure of spraining, open flow, well-flushing, survey initial data is a circulation; Making cave work generally carries out five cycles; Phases 3～5 circulation weekly, concrete quantity can increase and decrease according to the situation of caving in the gas injection pressure in preceding two cycles, gas injection time, coal seam etc.
(1) gases at high pressure of air compressor machine 24,25 and supercharger 23 generations are injected into well by the annular space between instrumentation tubes and production casing through the gas injection pipeline, pass through water filling (atomizing) continuously in the air injection pipe alignment well, water injection rate 2.0～5.0m with high-pressure injection pump 22 simultaneously
3/ inferior, with air, rock dust or the coal dust of wetting high temperature, injection fast.Gas injection pressure is with the progressively supercharging of each cycle, pressure 3～15MPa.
(2) pressure of spraining: gas injection pressure stops gas injection after reaching the pressure of setting, and valve-off 18 is sprained and pressed 20～30min, so that gases at high pressure are had an effect crushing coal seam or expansion, extension crack, and the changing value of record pressure.
(3) open flow: after the pressure of spraining finishes, open the valve that surges, make gases at high pressure, rock dust or coal dust carry out open flow through instrumentation tubes.
(4) after open flow finishes; Transfer instrumentation tubes to the shaft bottom, start air compressor machine (starting supercharger in case of necessity), air/foam is injected by the annular gap of gas injection pipeline through between instrumentation tubes and production casing; Simultaneously transfer the instrumentation tubes well-flushing gradually, accomplish a washing well process during to the water outlet of well internal return, gas to the shaft bottom.Rock dust, coal dust are cleaned in well.
Behind each clean-out service, carry out the measurement of coal seam aerogenesis effect initial data, with the period that contrasts the gas output of making behind the cave, work out cycle of making the cave and cycle at every turn and determine when and to finish to make cave work.
5, measure initial data
(1) gas flow measurement: close air compressor machine, supercharger and high-pressure injection pump, hydraulic valve; The interior gas of well is freely returned out through the measurement of discharge pipeline; Through the variation of flowmeter measurement coal bed gas gas output in a hour, and place torch at floss hole and light gas.
(2) pressure recovers: pressure recovers to measure: close all valves, through the variation of borehole pressure in pressure meter 11 or 3 observed and recordeds one hour, make the gas output situation in cave to understand each circulation or cycle.
Repeat above operation, until the purpose that reaches designing requirement.
The gases at high pressure of coal seam threshold burst pressure are injected in this method utilization, use instrumentation tubes to improve the upward velocity of air-flow, and the pressure of strengthening gas agitates effect, and strengthens the chip removal effect; Get rid of the disturbance of turbulence, reduce dirt band in the coal seam, landwaste with taking over the probability that bump produces blast, the use of foam has further improved safety.
Claims (4)
1. the reverse circulation aerodynamic cavitation method of a coal bed gas well is characterized in that: at well head wellhead assembly is installed, is lowered to instrumentation tubes to the shaft bottom; With rock dust in the clean well of air compressor machine loop cleaning or coal dust and water; Put forward instrumentation tubes then, inject air or foam, gas injection pressure 3～15MPa with air compressor machine and supercharger; Water filling or atomizing continuously in well simultaneously, the each 3.0～5.0m of water injection rate
3, open hydraulic gate valve door open flow then, after open flow finished, down to the position, coal seam, air compressor machine and supercharger moved the injection air simultaneously with instrumentation tubes, use grouting pump water filling or foam 3.0～10.0m simultaneously
3Carry out well-flushing to the shaft bottom.
2. the reverse circulation aerodynamic cavitation method of coal bed gas well according to claim 1, it is characterized in that: with gas injection, the pressure of spraining, open flow, well-flushing, survey initial data is a circulation, making cave work is five cycles, weekly phases 3～5 circulation.
3. the reverse circulation aerodynamic cavitation method of coal bed gas well according to claim 1; It is characterized in that: after whenever carrying out circulation of open flow and well-flushing; Carry out the detection of initial data, close air compressor machine, supercharger and grouting pump, hydraulic flat gate valve, the interior gas of well is freely returned out; Through the variation of flowmeter measurement coal bed gas gas output in a hour, and place torch at floss hole and light gas.
4. equipment of realizing the reverse circulation aerodynamic cavitation method of the said coal bed gas well of claim 1; It is characterized in that: go up connection one pipe nipple (17) at well head casing head (16); On this pipe nipple, connect end flange (15), bottom four-way (14), preventer (10), doughnut-shaped steel plate (8), top four-way (9), blind plate (1) successively; The left side port of bottom four-way connects with measurement of discharge pipeline (12) and is provided with flashboard valve (13) at point of attachment; The right side port connects with an end (19) of gas injection pipeline, and is provided with flashboard valve (18) at point of attachment, and gas flow meter (11) is installed on the measurement of discharge pipeline; The other end of gas injection pipeline connects with kill manifold (20); This kill manifold connects with high-pressure injection pump (22), release pipeline (30), supercharger (23), air compressor machine (24,25) through gas injection pipeline (21), Highpressure Tee (28), one-way cock (26) and flashboard valve (29) successively, on kill manifold, also is connected with active redundancy pipeline (27); The left side port of top four-way (9) connects with relief line (6), and is provided with hydraulic gate valve door (4) and manually-operated gate (5) at point of attachment, and the right side port is connected with pressure meter (3) and flashboard valve (2); Preventer is connected with the control cabinet that surges (7) respectively with hydraulic gate valve door (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101725587A CN101709629B (en) | 2009-11-06 | 2009-11-06 | Reverse circulation aerodynamic cavitation method for coalbed methane well and equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101725587A CN101709629B (en) | 2009-11-06 | 2009-11-06 | Reverse circulation aerodynamic cavitation method for coalbed methane well and equipment |
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| CN101709629A CN101709629A (en) | 2010-05-19 |
| CN101709629B true CN101709629B (en) | 2012-12-12 |
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| CN113863897B (en) * | 2020-06-12 | 2023-07-25 | 中国石油天然气股份有限公司 | Cave completion method and system |
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Inventor after: He Xinan Inventor after: Geng Jianguo Inventor after: Peng Guixiang Inventor after: Yuan Zhijian Inventor after: Zhang Jianqi Inventor after: Li Hongwei Inventor after: Lei Huayou Inventor after: Zhang Zhi Inventor after: Feng Yuefeng Inventor after: Luo Rui Inventor after: Zhu Yuxin Inventor after: Fu Zailin Inventor before: He Xinan Inventor before: Peng Guixiang Inventor before: Yuan Zhijian Inventor before: Li Hongwei Inventor before: Lei Huayou Inventor before: Zhang Zhi Inventor before: Feng Yuefeng Inventor before: Luo Rui Inventor before: Zhu Yuxin Inventor before: Fu Zailin Inventor before: Geng Jianguo |
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Address after: No.40, Songshan North Road, Zhongyuan District, Zhengzhou City, Henan Province Patentee after: No.2 Institute of resources and environment investigation of Henan Province Address before: 471023 No. 100, Longmen Road, Luoyang, Henan Patentee before: TEAM OF HENAN COAL GEOLOGY BUREAU |
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