WO2016110185A1 - 一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法 - Google Patents
一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法 Download PDFInfo
- Publication number
- WO2016110185A1 WO2016110185A1 PCT/CN2015/098153 CN2015098153W WO2016110185A1 WO 2016110185 A1 WO2016110185 A1 WO 2016110185A1 CN 2015098153 W CN2015098153 W CN 2015098153W WO 2016110185 A1 WO2016110185 A1 WO 2016110185A1
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- Prior art keywords
- gas
- fracturing
- hole
- extraction
- injection
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- 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.)
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Classifications
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- 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
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- 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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- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/006—Combined heating and pumping means
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
-
- 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
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
Definitions
- the invention relates to an oscillating pulse type high energy gas fracturing and a heat injection alternating gas extraction method, which is suitable for gas control in a high gas coal seam area of a microporous, low permeability and high adsorption coal mine.
- China's coal seams generally have the characteristics of high gas pressure, high content, low permeability and strong adsorption. Gas drainage is extremely difficult. Therefore, artificially increasing the coal seam, increasing the permeability of the coal seam and increasing the pre-extraction rate of the gas are important ways to ensure the safe production of coal mines.
- the object of the present invention is to provide an oscillating pulse type high energy gas fracturing and heat injection alternating extraction with high practicability, small engineering quantity, and remarkable improvement of gas drainage efficiency in view of the deficiencies in the prior art. Gas method.
- the oscillating pulse type high energy gas fracturing and heat injection alternating gas extraction method of the invention comprises the steps of arranging the hole position of the extraction hole in the direction of the coal seam direction; then sequentially constructing the extraction hole, sealing hole and joint Gas drainage in the gas drainage pipe network; the following steps are also included:
- the mesh-type extraction hole intersects the center to arrange the fracturing injection hole, and then drills in the hole position of the fracturing injection hole by the drilling machine until the drilled through the coal seam top plate;
- the steel pipe with the spin-type oscillating pulse jet nozzle is sent into the fracturing injection hole until it is 1 m away from the roof of the coal seam, and the steel pipe is pre-sealed and passed through the extraction pipe with the pumping pipe valve.
- the road connects the fracturing injection hole with the gas drainage pipe network;
- the spin-type oscillating pulse jet nozzle comprises a nozzle inlet, an oscillating cavity and a nozzle outlet.
- the nozzle inlet has a two-stage hole wall inclination change from the outside to the inside, and the nozzle outlet has a three-stage hole wall inclination change from the inside to the outside.
- the spin-type oscillating pulse jet nozzle is connected to the steel pipe through a bearing, and a waterproof sealing ring is installed between them.
- a glass wool insulation layer is attached to the outer wall of the steel pipe.
- the present invention adopts a high-pressure gas through a spin-type oscillating pulse jet nozzle to form a high-energy oscillating pulse jet, impact-breaking the coal body, promote the expansion of the primary crack in the coal body, and simultaneously generate a new crack, and the crack penetrates
- the formation of a fracture network improves the disturbance range of a single borehole and improves the single-hole gas drainage effect.
- the superheated steam forms a oscillating vapor pressure through the spin-oscillation pulse nozzle to promote the further expansion and penetration of the crack, which can more fully form the fracture network, and the hot steam injected into the coal body heats the coal body through the fracture network, reducing the gas in the coal body.
- the adsorption potential increases the desorption capacity of the gas and significantly improves the gas drainage effect.
- the invention overcomes the limitation of the single anti-transmission technology, and significantly increases the perturbation range of the single hole by the high-energy gas fracturing technology, forms a fracture network, provides a flow channel for the superheated steam, and the oscillating variable steam temperature and pressure promotes the coal The expansion and penetration of the body fissures, through the synergy of the two, significantly improve the desorption efficiency of the gas, and achieve efficient gas extraction.
- the method has strong practicability, especially for gas control in high gas coal seams with microporosity, low permeability and high adsorption.
- Figure 1 is a schematic view of a specific implementation method of the present invention
- FIG. 2 is a schematic structural view of a spin oscillation pulse jet nozzle
- Figure 3 is a cross-sectional view taken along line A-A of Figure 2;
- Figure 4 is a schematic illustration of a nozzle inlet of a spin-type oscillating pulse jet nozzle
- Figure 5 is a schematic illustration of the nozzle outlet of a spin oscillating pulse jet nozzle.
- the oscillating pulse type high energy gas fracturing and heat injection alternating gas extraction method of the invention has the following specific steps:
- a. including firstly arranging the hole position of the extraction hole 4 in the direction of the coal seam 1 in the form of a mesh, and then constructing the extraction hole 4, sealing the hole, and connecting the gas extraction pipe network to conduct gas drainage;
- the mesh type extraction hole 4 is arranged at the center of the fracturing injection hole 3, and the drilling machine is sequentially drilled at the hole position of the fracturing injection hole 3 until the diamond is passed through the coal seam top plate 2;
- the steel pipe 5 equipped with the spin-type oscillating pulse jet nozzle 6 is sent into the fracturing injection hole 3 until it is 1 m away from the top plate (2) of the coal seam, and the steel pipe 5 is pre-sealed and passed through the pumping
- the pumping pipeline of the pipeline valve 7 connects the fracturing injection hole 3 with the gas drainage pipe network; the outer wall of the steel pipe 5 is adhered with a glass wool insulation layer.
- the high-energy gas pipeline valve 8 allows the high-pressure gas in the high-pressure gas station 10 to enter through the steel pipe 5 through the tee 11 and is ejected from the spin-type oscillating pulse jet nozzle 6 to form a high-energy oscillating pulse jet for the fracturing injection hole 3
- the inner coal body is subjected to impact fracturing; wherein the spin-type oscillating pulse jet nozzle 6 is connected to the steel pipe 5 through a bearing 13, and the spin-type oscillating pulse jet nozzle 6 includes a nozzle inlet 6-1 and an oscillating cavity 6-2.
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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)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Nozzles (AREA)
Abstract
Description
Claims (5)
- 一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法,包括先向煤层(1)方向呈网格式布置抽采孔(4)的孔位;然后依次施工抽采孔(4)、封孔、联入瓦斯抽采管网进行瓦斯抽采;其特征在于,还包括如下步骤:a.在施工完成后的网格式抽采孔(4)交叉中心布置压裂注热孔(3),依次用钻机在压裂注热孔(3)的孔位处钻进,直到穿过煤层顶板(2)后退钻;b.将头部装有自旋式振荡脉冲射流喷嘴(6)的钢管(5)送入压裂注热孔(3)中,直至距煤层顶板(2)1m处,对钢管(5)预封孔,并通过装有抽采管道阀门(7)的抽采管路将压裂注热孔(3)与瓦斯抽采管网相连通;c.利用三通(11)将钢管(5)的外露端连入高压气站(10)与蒸汽发生器(12),先关闭阀门(7)和蒸汽发生器(12)的热蒸汽输送管道阀门(9),然后打开高压气站(10)的高能气体管道阀门(8),使高压气站(10)中的高压气经三通(11)经钢管(5)进入,从自旋式振荡脉冲射流喷嘴(6)喷出,形成高能振荡脉冲射流,对压裂注热孔(3)内的煤体进行冲击压裂;d.紧接着关闭高能气体管道阀门(8),打开抽采管道的阀门(7),对压裂注热孔(3)进行瓦斯抽采;e.待压裂注热孔(3)内的瓦斯浓度低于30%时,关闭抽采管道阀门(7),打开热蒸汽输送管道阀门(9);启动蒸汽发生器(12),向压裂与注热抽采孔(3)内注入热蒸汽,持续1~2h后,关闭蒸汽发生器(12)和热蒸汽输送管道阀门(9),停止注热;f.打开抽采管道的阀门(7),再次对压裂注热孔(3)进行瓦斯抽采;g.待压裂注热孔(3)内的瓦斯浓度又低于30%时,重复步骤c、d、e和f,直至压裂注热孔(3)的瓦斯浓度始终低于30%时,抽拉钢管(5),使自旋式振荡脉冲射流喷嘴(6)向孔口方向移动2~2.5m;i.重复步骤c、d、e、f和g,直到自旋式振荡脉冲射流喷嘴(6)退至距煤层底板1m处,结束压裂注热孔(3)的高能气体压裂与注热。
- 根据权利要求1所述的一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法,其特征在于:所述的自旋式振荡脉冲射流喷嘴(6)包括喷嘴入口(6-1)、振荡腔体(6-2)和喷嘴出口(6-3),喷嘴入口(6-1)由外向内有两级孔壁倾角变换,喷嘴出口(6-3)由内向外有三级孔壁倾角变换。
- 根据权利要求1所述的一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法,其特征在于:所述自旋式振荡脉冲射流喷嘴(6)通过轴承(13)与钢管(5)相连,之间安装有防水密封圈。
- 根据权利要求1所述的一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法,其 特征在于:所述向压裂与注入热抽采孔(3)内的热蒸汽温度为在100~500℃。
- 根据权利要求1所述的一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法,其特征在于:所述钢管(5)的外壁上附着有玻璃棉保温层。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2015376361A AU2015376361B2 (en) | 2015-01-06 | 2015-12-22 | Method for gas extraction alternating oscillating pulse high energy gas extraction with thermal injection |
| US15/321,891 US10378327B2 (en) | 2015-01-06 | 2015-12-22 | Method for gas extraction alternating oscillating pulse high energy gas extraction with thermal injection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510005776.7A CN104632270B (zh) | 2015-01-06 | 2015-01-06 | 一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法 |
| CN201510005776.7 | 2015-01-06 |
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| WO2016110185A1 true WO2016110185A1 (zh) | 2016-07-14 |
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| PCT/CN2015/098153 Ceased WO2016110185A1 (zh) | 2015-01-06 | 2015-12-22 | 一种振荡脉冲式高能气体压裂与注热交变抽采瓦斯方法 |
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| Country | Link |
|---|---|
| US (1) | US10378327B2 (zh) |
| CN (1) | CN104632270B (zh) |
| AU (1) | AU2015376361B2 (zh) |
| WO (1) | WO2016110185A1 (zh) |
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| CN113431623B (zh) * | 2021-07-28 | 2023-06-09 | 西安科技大学 | 高瓦斯软弱煤层抽采系统及方法 |
| CN114165197A (zh) * | 2021-12-09 | 2022-03-11 | 中国矿业大学(北京) | 一种脉冲水力裂切煤层卸压增透装置及卸压增透方法 |
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Also Published As
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| AU2015376361A1 (en) | 2017-01-12 |
| AU2015376361B2 (en) | 2017-07-13 |
| US10378327B2 (en) | 2019-08-13 |
| CN104632270A (zh) | 2015-05-20 |
| US20180209259A1 (en) | 2018-07-26 |
| CN104632270B (zh) | 2016-11-16 |
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