CN102493788B - Method of gas recovery by water drainage for high-coal-rank coal-bed methane well - Google Patents
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Abstract
This invention discloses a method of gas recovery by water drainage for high-coal-rank coal-bed methane well, which is applied in the technical field of gas recovery of coal-bed methane well; the method disclosed by this invention comprises a water draining stage, a pressure building stage, a pressure controlling stage, a stable yield and high yield stage and an attenuation stage, wherein different stages have different pressure controlling demands; the dropping speed of a working fluid level of the coal-bed methane well is controlled within 5-7m/d at the water draining stage; underground flow pressure is stabilized at the pressure building stage; the working fluid level is dropped by 0-3m/d in each day; fluctuation of the underground flow pressure is controlled within 0-0.3MPa; air discharging quantity is increased to 200-300m<3> at the pressure controlling stage; the height of the underground working fluid level is kept 15-30m above a coal layer roof board at the stable yield stage; the pressure values of surface casing pressure and the underground flow pressure are within 0.101-0.11MPa at the attenuation stage; and at the attenuation stage, all sleeve pipe gates are opened or an intermittent draw-off type gas recovery procedure is performed by a downward draw-off pump. The method disclosed by this invention has the advantages that underground pressure is controlled so as to realize stable dropping of stratum pressure and the matching of the stratum pressure and desorption pressure, desorption range is enlarged effectively, and area depressurization is realized.
Description
Technical field
The present invention relates to coal bed gas well production gas technology field, particularly the method for a kind of high rank coal layer gas well water pumping gas production.
Background technology
At present, external coal bed gas producing region is mainly in simply constructed middle low coal rank basin, and China constructs metastable middle part taking middle high rank coal as main, described high rank coal is: in 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 coal seam permeability is low, is the forbidden zone of the national exploration and developments such as the U.S., in being abroad applicable to, the CBM Drainage excavating technology way of low coal rank can not effectively instruct the mining of China's high rank coal layer gas.
Qinshui basin high rank coal layer gas well developed mainly with straight well, horizontal well is main, produce the curve and the U.S.'s powder river that simulate mainly with laboratory values in initial stage of development mining, the contour hole of black warrier is high oozes middle low order bed gas reservoir aerogenesis rule for instructing, and due to unclear to coal seam physical property dynamic rule and mining mechanism understanding, for pursuing early aerogenesis and fast acquisition output, 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 is quick decline trend.
China Patent Publication No. is: CN101666223, a kind of coal bed gas well Intelligent drainage mining method is provided, discharge and mining method is in aspiration procedure, in the time reaching fluid infusion condition, in down-hole liquid, supply with the satisfactory liquid of water quality to set flow, 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 of normal mining; Mining equipment 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 to water supply installation delivery port of described switch board control water supply flow.Constantly carry out supplementary dilution and the discharge of liquid according to hole condition, solve in the situation that coal ash content increases, displacement is lower of the reduction of coal bed gas well reservoir liquid supply rate, liquid, the problem that latent liquid motor radiating worsening condition easy burn-out, the easy holddown of liquid thickness burn pump, meanwhile, extend and drag for the cycle husky and inspection pump.
China Patent Publication No. is: CN101539008, a kind of ground stereoscopic discharge and mining method of coal bed methane is provided, adopt main shaft mining coal bed gas, main feature is destroyed raw coal reservoir systems exactly, break the equilibrium state of this system, make its relative homogeneous, create a new coal seam reservoirs system that is conducive to mining.In the coal seam around described main shaft, build cave by deviated directional drilling, form stress of coal seam concentration zones, in stress of coal seam balancing procedure, make the stress of coal seam around cave be discharged, and make coal seam that Zhang Xingyu shear failure occur, and produce new crack, form the interference between cave, cause in coal seam and communicate with each other in the crack, coal seam of sealing, semi-closed state, form large area air infiltration circulation road.Realize efficient drawing-off gas and improve coal bed gas well production capacity.
Summary of the invention
The object 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 high rank coal rock, in mining process, permeability variation is the synergistic effect of " open in the stream low closing of fracture-coal bed gas desorb of pressure drop crack " two kinds of effects, namely in coal bed gas manufacturing process, coal seam reservoirs permeability is the variation of first falling rear liter, and application the method realizes permeability variation mates with the effective of desorption rate.
The technical solution used in the present invention is: the method for high rank coal layer gas well water pumping gas production, according to the mining rule of high rank coal layer gas well, by 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 of three platen press " the mining technique way that is applicable to high coal rank, is divided into bleeding stage by the water pumping gas production process of high rank coal layer gas well, build the pressure the stage, the pressure control stage, high and stable yields stage and decling phase double teacher, core is to control three pressure (flowing bottomhole pressure (FBHP)s, desorption pressures, strata pressure) effective coupling, by five water pumping gas production stages to strata pressure, flowing bottomhole pressure (FBHP), mutual restriction control between these three pressure of desorption pressures, realizes flowing bottomhole pressure (FBHP), desorption pressures, the Proper Match of strata pressure, solves effective matching problem of permeability variation and desorption rate, has reached the best desorption effect of coal petrography desorb, has effectively expanded desorb scope, has kept the high yield of individual well, stable yields.
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 different control methods:
Step 1, bleeding stage: starting from high rank coal layer gas well the stage that draining equals desorption pressures to bottom pressure is bleeding stage; At the sleeve gate Close All of bleeding stage well head, 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 by 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 automatically controls two kinds of methods.In the time that being 0.101～0.2MPa, the force value of casing pressure table enters the stage of building the pressure.
Step 2, build the pressure the stage: in the stage of building the pressure, treat that the annular space pressure between oil pipe and sleeve pipe is elevated to 0.7～2.0MPa, 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 flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.03MPa, enters the pressure control stage.
Step 3, pressure control stage: pressure control stage water phase permeability reduces, desorb enlarged areas, tolerance supply capacity strengthens gradually.This stage near wellbore zone strata pressure, mainly by gas pressure balancing, is opened sleeve gate venting, and the pressure control stage, initial discharge quantity was controlled at 100～200m
3between, then increase gradually discharge quantity, the variation of the annular space pressure value between Continuous Observation oil pipe and sleeve pipe 30～60 minutes, and record annular space pressure variation between oil pipe and 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 sleeve pipe, between 0～0.015MPa/h, continues Open valve, increase discharge quantity to 200～300m
3between; The water supply capacity in this stage coal seam and flow conductivity have very large fluctuating, can not adopt single mining production system, need to constantly adjust the fluctuation of mining production system with steady dynamic liquid level, when the fluctuation range of the annular space pressure value between sleeve gate standard-sized sheet, oil pipe and sleeve pipe enters the stable yields stage during at 0.01～0.02MPa.
Step 4, high and stable yields stage: under high rank coal layer gas well, the height dimension of producing fluid level is held between the above 15～30m of roof, determines after producing fluid level, keeps producing fluid level to fluctuate between 0～2m; Flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.02MPa; 500～1000m continuously declined in gas production one month the same day
3when/d, enter the decling phase.
Step 5, decling phase: the strata pressure within the scope of producing well well control declines, and surface casing pressure and flowing bottomhole pressure (FBHP) are 0.101～0.11MPa, and gas production declines 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.
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 of three pressure " mining technique way.
Beneficial effect of the present invention: the method for high rank coal layer gas well water pumping gas production, realize the stable decline of strata pressure and mate with desorption pressures by control well bottom pressure, effectively expand desorb scope, realize area step-down.This technology is applied to Southern Qinshui Basin, and individual well average product is brought up to 1812 side/skies by 707 side/skies.
Brief description of the drawings
Fig. 1 is the method schematic diagram 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 schematic diagram.
Detailed description of the invention
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 described in further detail.
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.
Step 1, bleeding stage: start draining from Gu02Jing is bleeding stage in the time that bottom pressure is 3.8MPa; At the sleeve gate Close All of bleeding stage well head, oil pipe gate is opened draining, and bottom pressure decrease speed is controlled at 0.06MPa/d, monitors by pressure bomb; Producing fluid level decrease speed is controlled at 6m/d.What control method adopted is automatic control.In the time that being 0.104MPa, the force value of casing pressure table enters the stage of building the pressure.
Step 2, build the pressure the stage: in the stage of building the pressure, when the annular space pressure between oil pipe and sleeve pipe is elevated to 1.56MPa, opens the sleeve gate of well head and emit coal bed gas; Stablize flowing bottomhole pressure (FBHP), producing fluid level 3m/d falls in day, and flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.02MPa, enters the pressure control stage.
Step 3, pressure control stage: pressure control stage water phase permeability reduces little, and desorb enlarged areas is very fast, and tolerance supply capacity strengthens gradually.This stage near wellbore zone strata pressure, mainly by gas pressure balancing, is opened sleeve gate venting, and the pressure control stage, initial discharge quantity was controlled at 105m
3, then increase gradually discharge quantity to 160m
3, the variation of the annular space pressure value between Continuous Observation oil pipe and sleeve pipe 60 minutes, the annular space pressure decrease speed between oil pipe and sleeve pipe is 0.005MPa/h, continues Open valve, increases discharge quantity to 300m
3annular space pressure decrease speed between oil pipe and sleeve pipe is 0.004MPa/h, continue to open sleeve gate to standard-sized sheet, the fluctuation range of the annular space pressure value between oil pipe and sleeve pipe changes within the scope of 0.01～0.02MPa, and explanation should enter the stable yields stage.
Step 4, stable yields stage: Gu the height dimension of 02 well producing fluid level is held in the above 25m of roof, producing fluid level fluctuates between 0～1.5m; Flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.01MPa, and daily output tolerance is stabilized in 5000～5500m
3between/d.Continuously declined be greater than 500m in gas production one month the same day
3when/d, enter the decling phase.
Step 5, decling phase: the strata pressure within the scope of producing well well control declines, and the force value of surface casing pressure and flowing bottomhole pressure (FBHP) is 0.101～0.11MPa, and gas production declines 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.
Gu02Jing is a bite well in region, Qinshui basin high coal rank, go into operation in November, 2008, the method of application " five section of three pressure " high rank coal layer gas well water pumping gas production, taking flowing bottomhole pressure (FBHP), coal dust as control core, the mining principle of following " continuous, gradual change, long-term ", at draining rank fast reducing flowing bottomhole pressure (FBHP), prevents in the section of building the pressure the fluctuation that flowing bottomhole pressure (FBHP) is larger, slowly mining, starts venting when casing pressure rises to 1.56MPa; Produce the stage in a large number at aerogenesis initial stage coal dust, ensure mining continuity, anti-holddown, progressively amplifies tolerance; Stablize flowing bottomhole pressure (FBHP) and gas production in stable yields section, gas production steadily improves, more than single well 5000 sides/d.
Claims (1)
1. a 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, it is characterized in that different phase adopts different pressure control:
Step 1, bleeding stage: starting from high rank coal layer gas well the stage that draining equals desorption pressures to bottom pressure is bleeding stage; At the sleeve gate Close All of bleeding stage well head, 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 by 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 automatically controls two kinds of methods; In the time that being 0.101～0.2MPa, the force value of casing annulus pressure enters the stage of building the pressure;
Step 2, build the pressure the stage: in the stage of building the pressure, treat that the annular space pressure between oil pipe and sleeve pipe is elevated to 0.7～2.0MPa, 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 flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.03MPa, enters the pressure control stage;
Step 3, pressure control stage: pressure control stage water phase permeability reduces, desorb enlarged areas, tolerance supply capacity strengthens gradually; This stage near wellbore zone strata pressure, mainly by gas pressure balancing, is opened sleeve gate venting, and the pressure control stage, initial discharge quantity was controlled at 100～200m
3between, then increase gradually discharge quantity, the variation of the annular space pressure value between Continuous Observation oil pipe and sleeve pipe 30～60 minutes, and record annular space pressure variation between oil pipe and 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 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 sleeve pipe enters the high and stable yields stage during at 0.01～0.02MPa;
Step 4, high and stable yields stage: under high rank coal layer gas well, the height dimension of producing fluid level is held between the above 15～30m of roof, determines after producing fluid level, keeps producing fluid level to fluctuate between 0～2m; Flowing bottomhole pressure (FBHP) fluctuation is controlled in 0～0.02MPa; 500～1000m continuously declined in gas production one month the same day
3when/d, enter the decling phase;
Step 5, decling phase: the strata pressure within the scope of producing well well control declines, and the force value of surface casing pressure and flowing bottomhole pressure (FBHP) is 0.101～0.11MPa, and gas production declines 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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