CN102493788A - Drainage gas recovery method for high-coal-rank coal bed gas well - Google Patents
Drainage gas recovery method for high-coal-rank coal bed gas well Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011084 recovery Methods 0.000 title 1
- 238000004519 manufacturing process Methods 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003795 desorption Methods 0.000 claims abstract description 12
- 208000032843 Hemorrhage Diseases 0.000 claims description 14
- 208000034158 bleeding Diseases 0.000 claims description 14
- 230000000740 bleeding effect Effects 0.000 claims description 14
- 230000007423 decrease Effects 0.000 claims description 13
- 235000020681 well water Nutrition 0.000 claims description 11
- 239000002349 well water Substances 0.000 claims description 11
- 230000035699 permeability Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000013022 venting Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 6
- 238000005065 mining Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004079 vitrinite Substances 0.000 description 1
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Abstract
A method for draining water and producing gas of a high-coal-rank coal-bed gas well is applied to the technical field of gas production of the coal-bed gas well. Comprises a drainage stage, a pressure building stage, a pressure control stage and a stable and high yieldA production phase and a decay phase, different phases having different pressure control requirements. And the descending speed of the working fluid level of the coal-bed gas well in the drainage stage is controlled to be 5-7 m/d. And stabilizing the bottom hole flow pressure in the pressure building stage, wherein the daily drop of the working fluid level is 0-3 m/d, and the bottom hole flow pressure fluctuation is controlled within 0-0.03 MPa. Increasing the air discharge amount to 200-300 m in the pressure control stage3In the meantime. And in the stable production stage, the height of the underground working fluid level is maintained between 15 and 30m above the coal seam roof. And the pressure values of the wellhead casing pressure and the bottom hole flow pressure in the attenuation stage are 0.101-0.11 MPa, and the casing gate in the attenuation stage is completely opened or a descending pumping pump is adopted to intermittently pump the produced gas. The effect is as follows: the stable reduction of the formation pressure and the matching with the desorption pressure are realized by controlling the bottom hole pressure, the desorption range is effectively expanded, and the area depressurization is realized.
Description
Technical field
The present invention relates to coal bed gas well production gas technology field, the method for particularly a kind of high rank coal layer gas well water pumping gas production.
Background technology
At present; External coal bed gas producing region is low coal rank basin in simply constructed mainly; Is main and China constructs metastable middle part with middle high rank coal, and described high rank coal is: in the International Classification of Coal in Seam, vitrinite's mean random reflectance is not less than 2.0% coal.China's high rank coal stock number accounts for more than 60%, but the coal seam permeability is low, is the forbidden zone of national exploration and development such as U.S., in abroad being applicable to, the coal bed gas row excavating technology way of low coal rank can not effectively instruct the row of China's high rank coal layer gas to adopt.
The high rank coal layer gas well exploitation of basin, Qinshui is main with straight well, horizontal well mainly; Initial stage of development row adopt Gao Konggao such as producing many curves that simulate with laboratory values and U.S. powder river, black warrier ooze in low order bed gas reservoir aerogenesis rule be guidance; And because it is unclear that coal seam rerum natura dynamic rule and row are adopted mechanism understanding, be to pursue early aerogenesis and acquisition output fast, different bleeding stages have been taked identical, too fast pressure drop rate; Cause the effective stress increase of well week; Coal seam reservoirs is produced serious, possible permanent damage, finally cause major part well gas production on the low side, and output has been quick decline trend.
The Chinese patent publication number is: CN101666223; A kind of coal bed gas well intelligence discharge and mining method is provided; Discharge and mining method is in aspiration procedure; When reaching the fluid infusion condition, in down-hole liquid, supply with the satisfactory liquid of water quality, make the discharge rate of down-hole liquid level, down-hole liquid level decrease speed, down-hole liquid viscosity, down-hole liquid meet the requirement that normal row adopts to set flow; Row adopts equipment and comprises dewatering installation, water replanishing device, and water replanishing device comprises that the outlet of filling pipe is located near the immersed pump of down-hole by the water supply installation and the filling pipe that is connected the water supply installation delivery port of said switch board control water supply flow.Constantly carry out the additional dilution and the discharge of liquid according to hole condition; Solve under the situation that coal ash content increases, displacement is lower of the reduction of coal bed gas well reservoir liquid supply rate, liquid; Latent liquid motor radiating worsening condition easy burn-out, liquid thickness are prone to the problem that holddown burns pump; Simultaneously, prolong the cycle of dragging for sand and inspection pump.
The Chinese patent publication number is: CN101539008; A kind of ground stereoscopic discharge and mining method of coal bed methane is provided; Adopt main shaft row mining coal seam gas, main feature is destroyed the raw coal reservoir systems exactly, breaks the equilibrium state of this system; Make its relative homogeneousization, create new helping and arrange the coal seam reservoirs system of adopting.In the coal seam around the said main shaft, build the cave through deviated directional drilling, form the coal seam area of stress concentration; In the stress equilibrium process of coal seam, make cave coal seam stress on every side obtain discharging; And make the coal seam that Zhang Xingyu shear failure take place, and produce new crack, form the interference between the cave; Cause the crack, coal seam that is in sealing, semi-closed state in the coal seam to communicate with each other, form large tracts of land air infiltration circulation road.Realize efficient drawing-off gas and improve the coal bed gas well production capacity.
Summary of the invention
The objective of the invention is: the method that the water pumping gas production of a kind of high rank coal layer gas well is provided; For the high rank coal rock; The synergistic effect of " the low closing of fracture of stream pressure drop-open in coal bed gas desorb crack " two kinds of effects that row adopts that permeability variation is in the process; Just the coal seam reservoirs permeability is to fall the variation that afterwards rises earlier in the coal bed gas manufacturing process, uses effective coupling that this method realizes permeability variation and desorption rate.
The technical scheme that the present invention adopts is: the method for high rank coal layer gas well water pumping gas production; Row according to high rank coal layer gas well adopts rule; Through pressure balance, pressure control periodic test and flowing bottomhole pressure (FBHP), strata pressure, desorption pressures dynamic change and gas production rate relationship analysis; Invented " five section three platen press " row excavating technology way that is applicable to high coal rank; The water pumping gas production process that is about to high rank coal layer gas well is divided into bleeding stage, the stage that builds the pressure, pressure control stage, high and stable yields stage and five stages of decling phase; Core is effective coupling of three pressure of control (flowing bottomhole pressure (FBHP), desorption pressures, strata pressure), through five water pumping gas production stages the mutual restriction between strata pressure, flowing bottomhole pressure (FBHP), these three pressure of desorption pressures being controlled, realizes the rational Match of flowing bottomhole pressure (FBHP), desorption pressures, strata pressure; Solve effective matching problem of permeability variation and desorption rate; Reach the best desorption effect of coal petrography desorb, effectively enlarged the desorb scope, kept high yield, the stable yields of individual well.
The method of high rank coal layer gas well water pumping gas production comprises bleeding stage, the stage that builds the pressure, pressure control stage, high and stable yields stage and decling phase, and different phase adopts the Different control method:
The method of high rank coal layer gas well of the present invention water pumping gas production is also referred to as high rank coal layer gas well " five section three pressure " row excavating technology way.
Beneficial effect of the present invention: the method for high rank coal layer gas well water pumping gas production, mate through the stable decline of control well bottom pressure realization strata pressure and with desorption pressures, effectively enlarged the desorb scope, realized the area step-down.This technology is applied to south, basin, Qinshui, and the individual well average product is brought up to 1812 side/skies by 707 side/skies.
Description of drawings
Fig. 1 is the method sketch map of high rank coal layer gas well water pumping gas production.
Fig. 2 is method aerogenesis--the aquifer yield curve synoptic diagram of Gu02Jing high rank coal layer gas well water pumping gas production on probation.
Fig. 3 is solid 02 well bottom pressure change curve sketch map.
The specific embodiment
Embodiment 1: adopt the method for high rank coal layer gas well water pumping gas production to carry out gas production with Gu02Jing, the present invention is done further explain.
Consult Fig. 1.The method of high rank coal layer gas well water pumping gas production comprises bleeding stage, the stage that builds the pressure, pressure control stage, high and stable yields stage and decling phase, and different phase has different pressure control.
Consult Fig. 2 and Fig. 3.
Gu02Jing is a bite well in zone, high coal rank, basin, Qinshui, and go into operation in November, 2008, uses the method for " five section three pressure " high rank coal layer gas well water pumping gas production; With flowing bottomhole pressure (FBHP), coal dust is the control core; The row who follows " continuous, gradual change, long-term " adopts principle, reduces flowing bottomhole pressure (FBHP) fast on the draining rank, prevents the fluctuation that flowing bottomhole pressure (FBHP) is bigger in the section of building the pressure; Slowly row adopts, and begins venting when casing pressure rises to 1.56MPa; Produce the stage in a large number at aerogenesis initial stage coal dust, continuity is adopted by the row of guarantee, and anti-holddown progressively amplifies tolerance; Stablize flowing bottomhole pressure (FBHP) and gas production in the stable yields section, gas production steadily improves, individual well stable yields 5000 sides/and more than the d.
Claims (1)
1. the method for high rank coal layer gas well water pumping gas production comprises bleeding stage, the stage that builds the pressure, pressure control stage, high and stable yields stage and decling phase, and different phase adopts different pressure control:
Step 1, bleeding stage: from high rank coal layer gas well begin draining to the stage that bottom pressure equals desorption pressures be bleeding stage; At the sleeve gate Close All of bleeding stage well head, the oil pipe gate is opened draining, and high rank coal layer gas well bottom pressure decrease speed is controlled at 0.05～0.07MPa/d, monitors through pressure bomb; And high rank coal layer gas well producing fluid level decrease speed is controlled at 5～7m/d; Control method has manual control or controls two kinds of methods automatically; When the force value of casing annulus pressure is 0.101～0.2MPa, get into and build the pressure the stage;
Step 2, build the pressure the stage: in the stage of building the pressure, treat that the annular space pressure between oil pipe and the sleeve pipe is elevated to 0.7～2.OMPa, open the sleeve gate of well head and emit coal bed gas; Stablize flowing bottomhole pressure (FBHP), producing fluid level 0～3m/d falls in day, and the flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.03MPa, gets into the pressure control stage;
Step 3, pressure control stage: pressure control stage water phase permeability reduces, the desorb enlarged areas, and the tolerance supply capacity strengthens gradually; This stage near wellbore zone strata pressure is opened the sleeve gate venting mainly by gas pressure balancing, and the pressure control stage, initial discharge quantity was controlled at 100～200m
3Between; Increase discharge quantity then gradually; Observe continuously the variation 30～60 minutes of the annular space pressure value between oil pipe and the sleeve pipe, and the annular space pressure variation between record oil pipe and the sleeve pipe, the variation of flowing bottomhole pressure (FBHP) power, the change in depth of down-hole producing fluid level, the situation of change of water quality; If the annular space pressure value decrease speed between oil pipe and the sleeve pipe between 0～0.015MPa/h, continues Open valve, increase discharge quantity to 200～300m
3Between; When the fluctuation range of the annular space pressure value between sleeve gate standard-sized sheet, oil pipe and the sleeve pipe gets into the stable yields stage during at 0.01～0.02MPa;
Step 4, high and stable yields stage: the height dimension of producing fluid level is held between the above 15～30m of roof under the high rank coal layer gas well, confirm producing fluid level after, keep producing fluid level to fluctuate between 0～2m; The flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.02MPa; 500～1000m continuously descended in the gas production one month the same day
3During/d, get into the decling phase;
Step 5, decling phase: the strata pressure in the producing well well control scope descends, and the force value of surface casing pressure and flowing bottomhole pressure (FBHP) is 0.101～0.11MPa, and gas production descends naturally; The sleeve gate of decling phase is all opened or is adopted and is lowered to draw-off pump and carries out pumping gas production at intermittence.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104100237A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Drainage and mining method for coal-bed gas well |
| CN104251136A (en) * | 2013-06-28 | 2014-12-31 | 中国石油天然气股份有限公司 | Method for determining coal bed gas well coal submergence |
| CN104500056A (en) * | 2014-11-18 | 2015-04-08 | 河南方舟新能源股份有限公司 | DST well testing method for low-pressure reservoir stratum coal-bed gas well |
| CN104863547A (en) * | 2015-04-13 | 2015-08-26 | 中国海洋石油总公司 | Pressure-propagation-based method for determining discharge and recovery speed at initial stage of coalbed methane exploitation |
| CN104912522A (en) * | 2015-05-11 | 2015-09-16 | 中国矿业大学 | Combined drainage and mining device and technology for coal-bed gas well in high stress area |
| CN105205279A (en) * | 2015-10-10 | 2015-12-30 | 中国矿业大学 | Coal bed gas exhausting and extracting stage evaluating method considering solid particle migration |
| CN105332676A (en) * | 2015-12-02 | 2016-02-17 | 中国矿业大学 | Discharge and mining control method and device of exposing combination development coal-bed gas well upper production layer |
| CN105569613A (en) * | 2014-10-10 | 2016-05-11 | 中国石油天然气股份有限公司 | Medium-high-rank coal bed gas drainage and mining method |
| CN106401535A (en) * | 2015-07-30 | 2017-02-15 | 中国石油化工股份有限公司 | Method for determining drainage and mining intensity of coal-bed gas well |
| CN106769756A (en) * | 2016-11-30 | 2017-05-31 | 中国石油天然气股份有限公司 | Method for determining scale of water drainage with water and gas reservoirs in crack-pore type |
| CN107558963A (en) * | 2017-08-25 | 2018-01-09 | 重庆矿产资源开发有限公司 | A kind of southwest coal bed gas well mining stage production control method |
| CN107939351A (en) * | 2016-10-12 | 2018-04-20 | 中国石油天然气股份有限公司 | Coal bed gas drainage and gas production device and using method thereof |
| CN108316916A (en) * | 2018-01-15 | 2018-07-24 | 河南理工大学 | Mining pressure drop under different conditions of coal bed gas reservoir controls simulation experiment method |
| CN110388195A (en) * | 2018-04-23 | 2019-10-29 | 中国石油天然气股份有限公司 | Coal bed gas drainage and extraction method and system |
| CN112483163A (en) * | 2020-11-26 | 2021-03-12 | 河南工程学院 | One-way decreasing pressure control drainage and mining method for extracting coal bed gas on ground in tectonic coal mine area |
| CN114562247A (en) * | 2022-03-28 | 2022-05-31 | 贵州省油气勘查开发工程研究院 | Coal-series gas well drainage and production process for improving flow-back rate of fracturing fluid in weak water-containing coal series |
| CN114622875A (en) * | 2020-12-10 | 2022-06-14 | 中国石油天然气股份有限公司 | Drainage and production control method and device based on high-coal-rank coal bed gas fracturing horizontal well |
| CN114718512A (en) * | 2021-01-05 | 2022-07-08 | 中国石油天然气股份有限公司 | Coal bed gas pressure reduction discharge and mining simulation experiment device and method |
| CN117266804A (en) * | 2023-11-13 | 2023-12-22 | 东营中威石油技术服务有限公司 | Jet pump drainage control method and system |
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| CN114562247B (en) * | 2022-03-28 | 2023-07-21 | 贵州省油气勘查开发工程研究院 | Coal-series gas well drainage and production process for improving fracturing fluid flowback rate in weak water-containing coal-series |
| CN117266804A (en) * | 2023-11-13 | 2023-12-22 | 东营中威石油技术服务有限公司 | Jet pump drainage control method and system |
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