CN204436342U - Coal bed gas negative pressure on ground drainage device - Google Patents
Coal bed gas negative pressure on ground drainage device Download PDFInfo
- Publication number
- CN204436342U CN204436342U CN201520076525.3U CN201520076525U CN204436342U CN 204436342 U CN204436342 U CN 204436342U CN 201520076525 U CN201520076525 U CN 201520076525U CN 204436342 U CN204436342 U CN 204436342U
- Authority
- CN
- China
- Prior art keywords
- negative pressure
- coal bed
- bed gas
- ground
- drainage device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Jet Pumps And Other Pumps (AREA)
Abstract
The utility model coal bed gas negative pressure on ground drainage device comprise for reducing liquid level in well suction pump and be arranged at ground negative pressure pump, the water inlet of suction pump is positioned at below the water surface, its delivery port delivers to ground by drainage pipe, the gap that the air inlet port of negative pressure pump is formed towards gutter and well head, the exhaust opening of negative pressure pump discharges coal bed gas.Coal bed gas negative pressure on ground drainage device of the present utility model, by increasing negative pressure on ground pump, negative pressure is applied to coal seam, the gas (coal bed gas) being adsorbed on coal surface can be made to desorb, after being extracted into ground with air-tight manner (being compressed into LNG, CNG) or by Cemented filling to user, add the recovery ratio of coal bed gas, also increase the per unit area yield of coal bed gas and total product simultaneously.
Description
Technical field
The utility model belongs to cbm development technical field, relates to a kind of coal bed gas drainage device.
Background technology
Along with day by day the reducing of conventional gas and oil stock number, raising that control of coalmine gas requires and restriction to airborne release dusty gas, coal bed gas has entered the large-scale production stage at present as the exploration and development of clean energy resource.China's buried depth is shallower than the Coal bed gas project of 2000m more than 36 tcms, occupies third place in the world, and these abundant energy resources, if utilized completely, will make huge contribution to the sustainable development of Chinese national economy.In recent years, cbm development presents thriving situation, all there is large-scale development in the unit such as PetroChina Company Limited., China Petrochemical Industry, CNOOC three large energy giant, local coal enterprise, overseas-funded enterprise, and coalbed methane ground extraction carries out coal mining according to the industrial policy that country " first takes out and adopts afterwards ".
At present, the exploitation of coal bed gas has two kinds of modes, and one is underground mining, and another kind is ground extraction.
Underground mining adopts tunnel operation, the purity of coal bed gas is usually within 10%, wherein be mixed with air, unit volume calorific value is low, cost of transportation is high, cannot realize the utilization of scale, can only use nearby in locality or directly dilute emptying, annual domestic emptying coal bed gas reaches 15,000,000,000 sides, greenhouse effect, far above carbon dioxide, waste resource, pollute air; If the concentration height of coal bed gas can form certain impact to safety of coal mines again, institute thinks guarantee coal mining safety, and need a large amount of toward down-hole air-supply, reduction gas density, ensure safety in production, therefore, the coal bed gas purity of underground mining is low, inconvenience transport.
Only have when coal bed gas concentration reach 80% and above time, adopt low pressure transport pipeline, the transport of LNG or CNG tank car etc. just to have economy.High concentration gas mainly contains two kinds of sources: a kind of is the coal bed gas concentration of down-hole extraction improved by concentration technology, but low concentration gas concentration technology then high cost.Current low concentration gas purification technique mainly uses vacuum pressure swing adsorption process (VPSA), namely low concentration gas is at ambient pressure by after absorption tower adsorbs, the dividing potential drop recycling the method reduction CH4 vacuumized makes its desorb and collects, process raw material is the coal bed gas of CH4 content between 5% ~ 50% that extraction pump is discharged, by two-stage absorption can realize free adjustment between methane concentration 30% ~ 90%, wherein more than 30% directly can be used as domestic gas, gas electricity, boiler combustion etc.Concentration more than 90% just can by LNG prize car, CNG tinning or pipeline transport realize commercialization utilize; Another is the coal bed gas adopting ground extraction, and methane content reaches more than 95%.
At present, the major way of ground extraction falls liquid gas production, by the mode drilling well of well-digging, the depth ratio coal seam of well is dark, by installing suction pump in shaft bottom, reduce the pressure of water in pit shaft, thus the coal bed gas of the absorption in coal seam is resolved and under low pressure rising extraction is supplied to user.But the bed gas reservoir of China is generally low pressure, hypotonic bed gas reservoir, after the pressure depletion of current this surface mining mode coal seam, by the impact that coal seam gas lock and water are locked, natural gas (gas) in coal seam still has the remnants of about 50%, need for maintaining system, still to there is 0.2-0.5Mpa coal seam pressure, otherwise, need to carry out extraction in the coal mining stage from down-hole.
Summary of the invention
For solving the low technical problem of existing ground extraction mode production efficiency, the utility model provides a kind of coal bed gas negative pressure on ground drainage device.
A kind of coal bed gas negative pressure on ground drainage device, comprise the suction pump for reducing liquid level in well, the water inlet of described suction pump is positioned at below the water surface, and water is drained into ground by drainage pipe by the outfall of described suction pump,
Its special character is: described coal bed gas negative pressure on ground drainage device also comprises and is arranged at ground negative pressure pump, the gap that the air inlet port of described negative pressure pump is formed towards drainage pipe and well head, and the exhaust opening of described negative pressure pump discharges coal bed gas.
The water inlet of above-mentioned suction pump is positioned at below coal seam.
The water inlet of above-mentioned suction pump is also provided with screen casing and sand sediment pipe, and described sand sediment pipe is positioned at below screen casing.
Above-mentioned coal bed gas negative pressure on ground drainage device also comprises flushing fluid entrance, and described flushing fluid entrance is positioned at the opposite side of well head and the gap formed towards gutter and well head relative to negative pressure pump.
Above-mentioned coal bed gas negative pressure on ground drainage device also comprises gas-liquid separator, and the entrance of described gas-liquid separator is connected with the exhaust opening of negative pressure pump, and coal bed gas is discharged in the outlet of described gas-liquid separator.
Above-mentioned coal bed gas negative pressure on ground drainage device also comprises header tank, and the entrance of described header tank is connected with the outlet of gas-liquid separator, and the outlet of described header tank is connected with the cooling water inlet of negative pressure pump.
Above-mentioned suction pump is plunger displacement pump.
Above-mentioned negative pressure pump is water ring vacuum pump.
Compared with prior art, advantage is the utility model:
1, coal bed gas negative pressure on ground drainage device of the present utility model, by increasing negative pressure on ground pump, negative pressure is applied to coal seam, the gas (coal bed gas) being adsorbed on coal surface can be made to desorb, after being extracted into ground with air-tight manner (being compressed into LNG, CNG) or by Cemented filling to user.
2, by coal bed gas negative pressure on ground drainage device of the present utility model, add the recovery ratio of coal bed gas, also increase the per unit area yield of coal bed gas and total product simultaneously.
3, carry out coal-bed gas exploitation by coal bed gas negative pressure on ground drainage device of the present utility model, add cleaning fluid, discharge ground with suction pump by well-flushing pipeline, bug dusting becomes very easily and conveniently, the expense of well-flushing significantly reduces.
Accompanying drawing explanation
Fig. 1 is the utility model below ground tubing string schematic diagram;
Fig. 2 is the schematic diagram of optimization device of the present utility model;
Fig. 3 is the Production curve figure in year February in May, 2012 to 2015;
Wherein Reference numeral is: 1-suction pump, 2-negative pressure pump, and 3-coal bed gas exports, 4-header tank, 5-flushing fluid entrance, 6-coal seam, 7-gas-liquid separator, 8-spontaneous combustion of coal seam crack, 9-shaft bottom, 10-screen casing, 11-sand sediment pipe, 12-oil pick-up tube, 13-oil pipe, 14-coal seam water exports.
Detailed description of the invention
By reference to the accompanying drawings the utility model is elaborated from principle of the present utility model below.
The Principle and application effect analysis of the utility model coal bed gas negative pressure on ground drainage device:
Coal bed gas, as a kind of gas accumulation pattern of adsorbed gas, colonizes in the inner surface of coal, and in the recovery process of conventional ground, due to quantity and the stratum energy deficiency of absorption, most coal bed gas cannot be parsed by self-energy.The three types of reservoir damage: coal dust blocks, coal seam gas lock, water is locked, stress closes, the utility model have employed negative pressure extraction by studying its mechanism and the condition of production, negative pressure extraction technology is based upon to remove gas lock, water lock and coal dust block a technology on basis, just as infant feeding is the same with cow producing milk, if increase a negative-pressure breast pump to the nipple of ox, milk will be easy to output, this device utilizes this principle exactly, a negative pressure is applied to coal seam, thus make to be adsorbed on the methane gas that coal surface amasss and out form the clean energy resource with industrial value at ground extraction easily, through the coal seam of this device extraction, will to less than 0.1% by coal seam gas-bearing capacity, for colliery provides the guarantee of safety in production.
The utility model coal bed gas negative pressure on ground drainage device comprise for reducing liquid level in well suction pump 1 and be arranged at ground negative pressure pump 2, the water inlet of suction pump is positioned at below the water surface, its delivery port delivers to ground by drainage pipe, the gap that the air inlet port of negative pressure pump is formed towards gutter and well head, the exhaust opening of negative pressure pump 2 discharges coal bed gas.
Fig. 1 is the utility model ground tubing string schematic diagram, suction pump wherein can use on oil field normally used utilize sucker rod 12 to drive piston type oil well pump or screw pump, its drainage pipe also can use the oil pipe 13 on oil field; Certainly, suction pump of the present utility model also can use submersible pump; Coal bed gas outlet 3 connects negative pressure pump.
Further, block to prevent the water inlet of suction pump, the utility model is also provided with screen casing 10 and sand sediment pipe 11 in the water inlet of suction pump, to carry out filtration desanding to large particulate matter and sand, be sunken to shaft bottom 9, wherein screen casing is used for the sand in filtered water, and sand sediment pipe is used for washing sand precipitation.
Further, sand sediment pipe of the present utility model is positioned at below screen casing.
Further, the side of the utility model well head on the ground is also provided with flushing fluid entrance 5, for putting into flushing fluid in well, eliminates blocking.
Further, the large particulate matter be mingled with in the coal bed gas of the extraction in order to eliminate and water, the utility model arranges gas-liquid separator to eliminate large particulate matter in coal bed gas and water in the exhaust ports of negative pressure pump.
Further, the utility model coal bed gas negative pressure on ground drainage device also comprises header tank, and the entrance of header tank is connected with the outlet of gas-liquid separator, and the outlet of header tank is connected with the cooling water inlet of negative pressure pump.Define a water circulation between header tank, gas-liquid separator, header tank, namely serve the effect of Separation of Water, serve again the effect that negative pressure pump is cooled.
In addition, suction pump of the present utility model can select plunger displacement pump, also can select screw pump; Negative pressure pump of the present utility model can select water ring vacuum pump, also can select other negative-pressure vacuum devices.
Figure 3 shows that the Production curve figure in year February in May, 2012 to 2015, be not difficult to find out by this curve: bottom pressure is lower, the output of coal bed gas is higher, before negative pressure extraction, (this figure cannot embody negative pressure value too greatly because of ratio to output lower than 50 cubic metres/day, actual suction pressure table indicated value is-0.097Mpa), output when first peak value occurs also is the level at about 250 cubic metres/day.By negative pressure extraction, output a few days ago has risen to about 630 cubic metres/day, and amount of increase in production is 40%, current production rate still rise passage, when bottom pressure close to zero time, output can rise to 660 cubic metres/day.And the reduction of bottom pressure also has positive contribution to the output of the water in coal seam, by 0.3 before negative-pressure vacuum extraction cubic metre/day, be increased to current 0.63 cubic metre/day, increasing degree is: 4 times, this is again a positive signal, if aquifer yield can maintain, the amplitude of volume increase will present the increase of geometry multiple according to rule.
Table 1 is on-the-spot actual tests data
Wherein, in 2014, when namely not adopting coal bed gas negative pressure on ground drainage device of the present utility model, average daily production is 17.26 cubic metres, when producing measured, as 20 days-December 19 November in 2014, average daily production is 43.1 cubic metres, after have employed coal bed gas negative pressure on ground drainage device of the present utility model, during beginning, output is lower, average daily production is at 363.65 cubic metres, afterwards, average daily production was up to more than 600 cubic metres, and output has had very large raising.
Claims (8)
1. a coal bed gas negative pressure on ground drainage device, comprises the suction pump for reducing liquid level in well, and the water inlet of described suction pump is positioned at below the water surface, and water is drained into ground by drainage pipe by the outfall of described suction pump,
It is characterized in that: described coal bed gas negative pressure on ground drainage device also comprises and is arranged at ground negative pressure pump, the gap that the air inlet port of described negative pressure pump is formed towards drainage pipe and well head, the exhaust opening of described negative pressure pump discharges coal bed gas.
2. coal bed gas negative pressure on ground drainage device according to claim 1, is characterized in that: described suction pump is positioned at below coal seam.
3. coal bed gas negative pressure on ground drainage device according to claim 2, is characterized in that: the water inlet of described suction pump is also provided with screen casing and sand sediment pipe, and described sand sediment pipe is positioned at below screen casing.
4. coal bed gas negative pressure on ground drainage device according to claim 3, it is characterized in that: described coal bed gas negative pressure on ground drainage device also comprises flushing fluid entrance, described flushing fluid entrance is positioned at the opposite side of well head and the gap formed towards gutter and well head relative to negative pressure pump.
5., according to the coal bed gas negative pressure on ground drainage device one of claim 1 or 4 Suo Shu, it is characterized in that:
Described coal bed gas negative pressure on ground drainage device also comprises gas-liquid separator, and the entrance of described gas-liquid separator is connected with the exhaust opening of negative pressure pump, and coal bed gas is discharged in the outlet of described gas-liquid separator.
6. coal bed gas negative pressure on ground drainage device according to claim 5, it is characterized in that: described coal bed gas negative pressure on ground drainage device also comprises header tank, the entrance of described header tank is connected with the outlet of gas-liquid separator, and the outlet of described header tank is connected with the cooling water inlet of negative pressure pump.
7. coal bed gas negative pressure on ground drainage device according to claim 6, is characterized in that: described suction pump is plunger displacement pump.
8. coal bed gas negative pressure on ground drainage device according to claim 7, is characterized in that: described negative pressure pump is water ring vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520076525.3U CN204436342U (en) | 2015-02-02 | 2015-02-02 | Coal bed gas negative pressure on ground drainage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520076525.3U CN204436342U (en) | 2015-02-02 | 2015-02-02 | Coal bed gas negative pressure on ground drainage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204436342U true CN204436342U (en) | 2015-07-01 |
Family
ID=53604220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520076525.3U Expired - Fee Related CN204436342U (en) | 2015-02-02 | 2015-02-02 | Coal bed gas negative pressure on ground drainage device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204436342U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761584A (en) * | 2017-02-25 | 2017-05-31 | 太原理工大学 | Abandoned mine goaf coal bed gas ground discharge and mining method under a kind of aqueous conditions |
| CN107476784A (en) * | 2017-07-21 | 2017-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of CBM Drainage mining method of oil pipe production aquatic products gas |
| CN109611056A (en) * | 2018-12-18 | 2019-04-12 | 辽宁工程技术大学 | One kind is based on complicated structure band gas drainage solid protrusion-dispelling system and method |
| CN112901120A (en) * | 2021-03-30 | 2021-06-04 | 西安科技大学 | Coal bed gas U-shaped well gas injection circulation negative pressure extraction device and method |
| CN113638717A (en) * | 2021-09-14 | 2021-11-12 | 四川恒重清洁能源成套装备制造有限公司 | Low-pressure low-yield well drainage gas recovery method |
| CN115492557A (en) * | 2022-10-18 | 2022-12-20 | 中国矿业大学 | Deep non-recoverable coal seam CO 2 Sealing and coal bed gas negative pressure extraction device and method |
| CN115898517A (en) * | 2023-01-06 | 2023-04-04 | 淄博水环真空泵厂有限公司 | High negative pressure water conservation colliery gas drainage system |
-
2015
- 2015-02-02 CN CN201520076525.3U patent/CN204436342U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761584A (en) * | 2017-02-25 | 2017-05-31 | 太原理工大学 | Abandoned mine goaf coal bed gas ground discharge and mining method under a kind of aqueous conditions |
| CN107476784A (en) * | 2017-07-21 | 2017-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of CBM Drainage mining method of oil pipe production aquatic products gas |
| CN109611056A (en) * | 2018-12-18 | 2019-04-12 | 辽宁工程技术大学 | One kind is based on complicated structure band gas drainage solid protrusion-dispelling system and method |
| CN109611056B (en) * | 2018-12-18 | 2020-11-06 | 辽宁工程技术大学 | Three-dimensional outburst prevention system and method for gas extraction based on complex structure zone |
| CN112901120A (en) * | 2021-03-30 | 2021-06-04 | 西安科技大学 | Coal bed gas U-shaped well gas injection circulation negative pressure extraction device and method |
| CN113638717A (en) * | 2021-09-14 | 2021-11-12 | 四川恒重清洁能源成套装备制造有限公司 | Low-pressure low-yield well drainage gas recovery method |
| CN115492557A (en) * | 2022-10-18 | 2022-12-20 | 中国矿业大学 | Deep non-recoverable coal seam CO 2 Sealing and coal bed gas negative pressure extraction device and method |
| CN115492557B (en) * | 2022-10-18 | 2023-11-07 | 中国矿业大学 | Deep non-recoverable coal seam CO 2 Sealing and storing device and method for extracting coalbed methane under negative pressure |
| CN115898517A (en) * | 2023-01-06 | 2023-04-04 | 淄博水环真空泵厂有限公司 | High negative pressure water conservation colliery gas drainage system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204436342U (en) | Coal bed gas negative pressure on ground drainage device | |
| CN102877819B (en) | Carbon dioxide cyclic injection system of coal-bed gas well | |
| CN202064905U (en) | Gas lift liquid drainage device of vehicle-mounted natural gas compressor | |
| CN201884015U (en) | Liquid drainage and gas production device for natural gas well | |
| CN107313753B (en) | A kind of coal bed gas well point, which is adopted, separates pump and device | |
| CN204572050U (en) | A kind of coal mine gas extraction pipeline tailrace | |
| CN101122217A (en) | Down-hole pump drainage laneway exploitation system for mixing gas dispelling coal gas, and the method | |
| CN1944950A (en) | Method for recovering sea bottom hydrate by underwell gas and water separation and back injection | |
| CN104074494B (en) | Combination type well casing gas recovery device | |
| CN103912253A (en) | Gas well single well gas recovery system and low-pressure recovery method thereof | |
| CN203559876U (en) | Closed gas-lift liquid discharge combined tubing string for low-pressure oil and gas well | |
| CN104329114B (en) | A kind of method of down-hole drilling batch (-type) mash gas extraction | |
| CN104018813A (en) | Coal bed gas exploitation method | |
| CN206468372U (en) | A kind of automatic slag-discharging water draining device of gas pumping pipe | |
| CN202954747U (en) | Drainage and production string of coal-bed gas well | |
| CN207194871U (en) | A kind of coal bed gas well is double to adopt tubular column unit | |
| CN206571473U (en) | A kind of girdle extraction system based on microorganism gasification principle | |
| CN101122222A (en) | Down-hole horizontal hole exploitation system for mixing gas displacing coal gas, and the method | |
| CN103244077B (en) | Crude oil solution gas underground collection device | |
| CN207048750U (en) | A kind of coal bed gas well is layered mining wellhead assembly | |
| CN202360063U (en) | Automatic degassing and recovering device for oil well casing | |
| CN113445970A (en) | Ground production increase auxiliary device of coal bed gas single well tolerance | |
| CN202745934U (en) | Downward extraction borehole drainage device | |
| CN206338085U (en) | A kind of coal mine gas high pressure mixes nitrogen extraction equipment | |
| CN202968277U (en) | Oil-field sewage treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20170202 |