CN105114038A - System and method for increasing drainage quantity of coal bed gas of ground well drainage goaf - Google Patents
System and method for increasing drainage quantity of coal bed gas of ground well drainage goaf Download PDFInfo
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- CN105114038A CN105114038A CN201510468723.9A CN201510468723A CN105114038A CN 105114038 A CN105114038 A CN 105114038A CN 201510468723 A CN201510468723 A CN 201510468723A CN 105114038 A CN105114038 A CN 105114038A
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Abstract
The invention discloses a system and a method for increasing drainage quantity of coal bed gas of a ground well drainage goaf and belongs to the technical field of coal bed gas drainage. The method includes: constructing a drainage well between adjacent goaf holes, sequentially sending a drainage pipe and a flow injection pipe in, and arranging sealing sections I and II; opening a valve I and a valve III, injecting 30-60 MPa of supercritical CO2 into the flow injection pipe until pressure indicating number declines suddenly; opening a valve II to enable a ground drainage station to drain the coal bed gas, recording initial gas flow, repeating replacement of coal bed gas with CO2 when coal bed gas flow declines 30% of the initial gas flow again, and stopping coal bed gas drainage until the coal bed gas flow declines to 16% of the initial gas flow finally. By the system and the method, concentration of drained coal bed gas is increased effectively, and cost for separation and purification is lowered; supercritical CO2 jet flow is adopted to break coal columns, so that threshold pressure is low, breaking speed is high, no pollution is caused to a coal bed gas reservoir, and rock breaking efficiency can be improved substantially.
Description
Technical field
The present invention relates to a kind of system and method improving ground well drainage old dead zone coal bed gas extraction amount, belong to coal bed gas extraction technical field.
Background technology
Current China mainly adopts ground drilling to carry out extraction to coal bed gas residual in old dead zone, extracting result is unsatisfactory, after methane output declines, ground drilling is often directly abandoned, but in fact now abandon ground drilling not abundant for coal bed gas a large amount of for underground methane drainage and utilization project, still to adsorb in a large amount of coals be not plucked out of that underground exists and can utilize coal bed gas in a large number.This part coal bed gas transfers free state to by adsorbed state desorb and needs certain hour, if now abandon ground drilling, a large amount of coal bed gas is abandoned adopts, if now continue extraction, the gas purity in extraction is not high, and the utilization reaching coal bed gas still needs ground to purify, and this adds cost undoubtedly.
According to statistics, long-term large-scale coal mining leaves numerous abandoned mine and the huge old dead zone of area to Shanxi, and ended for the end of the year 2013, Shanxi Province has more than 4700 and locates abandoned mine, old dead zone area has reached 5000 square kilometres, gas reserves about 30 billion cubic meter.Gas is a kind of clean energy resource, old dead zone is remained to the recovery energy of coal bed gas, effectively can alleviate the under-supply situation of China's natural gas, and have good environmental benefit and economic benefit.At present, old dead zone gas constructs ground drilling with extraction old dead zone gas primarily of ground in the fissure zone of top, goaf, in this kind of method wellbore construction process, difficulty of construction is large, accident rate is high, become that porosity is low, output is little, cost is large, and only can the gas of the single old dead zone of extraction.Need the pumping method that a kind of difficulty of construction of exploitation is little, accident rate is low and output is large, cost is little old dead zone remains coal bed gas badly.
In recent years, along with the development of seam mining technology, leave over lower a large amount of old dead zone after coal mining, and these old dead zones are much in the abundant coalfield of Coal bed gas project.Because historical reasons make China exist a lot due to the goaf of coal mining in small colliery formation, it is lower that these mining areas also exist coal recovery rate, it is more that coal is lost in old dead zone, residual coal body discharges the problem that a considerable number of coal bed gas resource is not used effectively for a long time, and exploitation utilizes gas in the old dead zone of this Part Coal Mine significant.
Summary of the invention
The present invention aims to provide a kind of system and method improving ground well drainage old dead zone coal bed gas extraction amount, overcome traditional ground drilling and pass through the difficult problem that goaf difficulty of construction is large, accident rate is high, one-tenth porosity is low, improve coal bed gas extraction amount, extend the effective length of service of ground drilling individual well.
The present invention realizes by the following technical solutions:
The invention provides a kind of system improving ground well drainage old dead zone coal bed gas extraction amount, comprise extraction drilling well, ground extraction station, valve II, drainage tube, beam pipe, pressure meter, valve I, tee piece I, heater, liquid booster pump, liquid CO
2storage tank, refrigerating plant, valve III, gas boosting pump, valve IV, tee piece II, CO
2gasholder, described extraction drilling well is led to bottom coal column, and drainage tube, beam pipe are delivered to bottom coal column by extraction drilling well; Seal section I (6) is concordant with ground, and seal section II (19) is positioned at 0.5 ~ 2m above coal column; Above the ground beam pipe Bonding pressure table, valve I, tee piece I, tee piece I other end is connected with parallel pipeline, and one end of parallel pipeline is provided with heater, liquid booster pump, liquid CO successively
2storage tank, refrigerating plant, valve III, the other end of parallel pipeline is provided with gas boosting pump, valve IV successively, and two-way comes together in tee piece II afterwards, and tee piece II connects CO
2gasholder.
Refrigerating plant described in said system is primarily of air inlet port, air storing cavity, cooling piece, insulating layer, temperature pick up, pressure
The part such as sensor, relief valve, gas outlet composition; Heater is primarily of part compositions such as air inlet port, air storing cavity, heating plate, relief valve, pressure sensor, temperature pick up, gas outlets.
In said system, the scope that described drainage tube inserts in coal column is sieve tube segment, and sieve tube segment is evenly provided with hole, the scope that described beam pipe inserts in coal column is horizontal spout section, beam pipe bottom end seal, horizontal spout section is perpendicular to beam pipe, and horizontal spout is uniformly distributed along 360 degree, beam tubular axis line.
The invention provides a kind of method improving ground well drainage old dead zone coal bed gas extraction amount, adopt said apparatus, comprise the following steps:
1) construction extraction drilling well is carried out by ground to the coal column between cavity, adjacent goaf, boring is beaten to coal column, adopt the cotton binding drainage tube and beam pipe uphole end that are moistened with polyurethane respectively, and drainage tube, beam pipe insert 0.5 ~ 2m place, upper end of coal column range section, drainage tube, beam Guan Jun are delivered to coal column base plate, locates to form seal section I and seal section II respectively above extraction drilling well-head place and coal column;
2) open valve I, valve III, make refrigerating plant, heater, fluid pressurization pump work, by ground CO
2gasholder is successively through valve III, refrigerating plant, liquid CO
2storage tank, liquid booster pump, heater, valve I, pressure meter, in beam pipe continue injection 30 ~ 60MPa supercritical CO
2, when the rapid drawdown of pressure meter registration, valve-off I, valve III, stop jet pressure break;
3) open valve II and carry out extraction through drainage tube to coal bed gas by ground extraction station, record computer inspection, is designated as A;
4) when coal bed gas flow drops to 30% of computer inspection A, valve-off II, opens valve I, valve IV, by ground CO
2gasholder injects 0.5 ~ 2MPaCO through valve IV, gas boosting pump, valve I to beam pipe successively
2gas 12 ~ 24h, valve-off I, valve IV, place 24 ~ 30h;
5) open valve II, continue to carry out extraction through drainage tube to coal bed gas by ground extraction station;
6) step 4), 5 is repeated when coal bed gas flow drops to 30% of computer inspection A again), until when coal bed gas flow finally drops to 16% of computer inspection A, valve-off II stops coal bed gas extraction.
Boring described in said method is beaten apart from base plate 0.5 ~ 1m to coal column, and the seal length of seal section I and seal section II is 3 ~ 5m.
The diameter of extraction drilling well in said method is 250 ~ 350mm, and the diameter of drainage tube and beam pipe is 100 ~ 150mm, and beam pipe lowermost end seals, and the horizontal nozzle diameter of horizontal spout section is 2 ~ 8mm.
Of the present invention
beneficial effect:
(1) traditional ground drilling is owing to penetrating goaf, so exist in wellbore construction process, difficulty of construction is large, accident rate is high, become the difficult problem that porosity is low; The present invention drills to coal column place construction drill, avoids an above-mentioned difficult problem;
(2) traditional ground drilling effective seeervice cycle is shorter, coal bed gas extraction amount is low; The present invention effectively improves old dead zone coal bed gas extraction amount, and extends the effective length of service of ground drilling, has saved financial cost and has obtained larger income;
(3) effectively improve the coal bed gas concentration in extraction, reduce coal bed gas industrialized utilization and still need this part cost of separating-purifying;
(4) supercritical CO is adopted
2low, the broken speed of jet crushing coal column threshold pressure is fast, pollution-free to coalbed methane reservoir, significantly can improve efficiency of breaking rock
.
Accompanying drawing explanation
Fig. 1 is the system schematic of old dead zone extraction coal bed gas.
In figure, 1, extraction drilling well, 2, cavity, goaf, 3, coal column, 4, drainage tube, 5, beam pipe, 6, seal section I, 7, valve II, 8, valve I, 9, gas boosting pump, 10, CO
2gasholder, 11, ground extraction station, 12, sieve tube segment, 13, valve IV, 14 valve III, 15, refrigerating plant, 16, liquid CO
2storage tank, 17, liquid booster pump, 18, jet pipeline section, 19, seal section II, 20, tee piece I, 21, tee piece II, 22, heater, 23, pressure meter.
Detailed description of the invention
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment:
As shown in Figure 1, the invention provides a kind of system improving ground well drainage old dead zone coal bed gas extraction amount, comprise extraction drilling well 1, ground extraction station 11, valve II 7, drainage tube 4, beam pipe 5, pressure meter 23, valve I 8, tee piece I 20, heater 22, liquid booster pump 17, liquid CO
2storage tank 16, refrigerating plant 15, valve III 14, gas boosting pump 9, valve IV 13, tee piece II 21, CO
2gasholder 10, described extraction drilling well 1 is led to bottom coal column 3, and drainage tube 4, beam pipe 5 are delivered to bottom coal column 3 by extraction drilling well 1; Seal section I (6) is concordant with ground, and seal section II (19) is positioned at 0.5 ~ 2m above coal column; Above the ground beam pipe 5 Bonding pressure table 23, valve I 8, tee piece I 20, tee piece I 20 other end is connected with parallel pipeline, and one end of parallel pipeline is provided with heater 22, liquid booster pump 17, liquid CO successively
2storage tank 16, refrigerating plant 15, valve III 14, the other end of parallel pipeline is provided with gas boosting pump 9, valve IV 13 successively, and two-way comes together in tee piece II 21 afterwards, and tee piece II 21 connects CO
2gasholder 10.
Refrigerating plant described in said system is primarily of air inlet port, air storing cavity, cooling piece, insulating layer, temperature pick up, pressure
Sensor, relief valve, gas outlet composition; Heater is primarily of air inlet port, air storing cavity, heating plate, relief valve, pressure sensor, temperature pick up, gas outlet composition.
Further, described drainage tube 4 scope inserted in coal column 3 is sieve tube segment, sieve tube segment is evenly provided with hole, described beam pipe 5 scope inserted in coal column 3 is horizontal spout section, beam pipe 5 bottom end seal, horizontal spout section is perpendicular to beam pipe 5, and horizontal spout is uniformly distributed along 360 degree, beam pipe 5 axis.
Illustrate the method improving ground well drainage old dead zone coal bed gas extraction amount below, adopt said system, for Jin Mei group Yue Cheng colliery, the present invention is described.
Determine the overview of old dead zone: Jin Mei group Yue Cheng ore deposit is an integration ore deposit annexing multiple small coal mine, since exploitation, a large amount of old dead zones has been formed in the south of its field with "nine squares" scope and western part, tentatively determine that cavity, goaf and coal column stay the general location of establishing according to the coordinate on the mining engineering plan of Yue Cheng ore deposit, in conjunction with physics exploration means, as transient electromagnetic method or ground penetrating radar, determine that the position in cavity, goaf and coal column stay and establish situation.
Comprise the following steps:
1) construction extraction drilling well is carried out by ground to the coal column between cavity, adjacent goaf, boring is beaten to coal column, the cotton being moistened with polyurethane is bundled respectively drainage tube (4) and beam pipe (5) uphole end, seal section I is formed at drilling well-head place, the cotton being moistened with polyurethane is bundled respectively drainage tube (4), beam pipe (5) inserts 1m place, coal column upper end, above coal column, form seal section II, drainage tube, beam Guan Jun are delivered to coal column base plate;
2) open valve I, valve III, make refrigerating plant, heater, fluid pressurization pump work, by ground CO
2gasholder is successively through valve III, refrigerating plant, liquid CO
2storage tank, liquid booster pump, heater, valve I, pressure meter, continue to inject 40MPa supercritical CO in beam pipe
2, when the rapid drawdown of pressure meter registration, valve-off I, valve III, stop jet pressure break;
3) open valve II and carry out extraction through drainage tube to coal bed gas by ground extraction station, record computer inspection, is designated as A;
4) when coal bed gas flow drops to 30% of computer inspection A, valve-off II, opens valve I, valve IV, by ground CO
2gasholder injects 1.5MPaCO through valve IV, gas boosting pump, valve I to beam pipe successively
2gas 20h, valve-off I, valve IV, place 28h;
5) open valve II, continue to carry out extraction through drainage tube to coal bed gas by ground extraction station;
6) step 4), 5 is repeated when coal bed gas flow drops to 30% of computer inspection A again), until when coal bed gas flow finally drops to 16% of computer inspection A, valve-off II stops coal bed gas extraction.
Boring described in the present embodiment is beaten apart from base plate 0.8m to coal column, and the length of seal section I is 3m, and the length of seal section II is 4.5m.
The diameter of extraction drilling well in the present embodiment is 300mm, and the diameter of drainage tube and beam pipe is 120mm, and beam pipe lowermost end seals, the horizontal nozzle diameter 6mm of horizontal spout section.
Claims (5)
1. improve a system for ground well drainage old dead zone coal bed gas extraction amount, it is characterized in that: comprise extraction drilling well (1), ground extraction station (11), valve II (7), drainage tube (4), beam pipe (5), pressure meter (23), valve I (8), tee piece I (20), heater (22), liquid booster pump (17), liquid CO
2storage tank (16), refrigerating plant (15), valve III (14), gas boosting pump (9), valve IV (13), tee piece II (21), CO
2gasholder (10), seal section I (6), seal section II (19), described extraction drilling well (1) is towards coal column (3) bottom, and drainage tube (4), beam pipe (5) deliver to coal column (3) bottom by extraction drilling well (1); Seal section I (6) is concordant with ground, and seal section II (19) is positioned at 0.5 ~ 2m above coal column; Above the ground beam pipe (5) Bonding pressure table (23), valve I (8), tee piece I (20), tee piece I (20) other end is connected with parallel pipeline, and one end of parallel pipeline is provided with heater (22), liquid booster pump (17), liquid CO successively
2storage tank (16), refrigerating plant (15), valve III (14), the other end of parallel pipeline is provided with gas boosting pump (9), valve IV (13) successively, two-way comes together in tee piece II (21) afterwards, and tee piece II (21) connects CO
2gasholder (10).
2. the system of old dead zone extraction coal bed gas according to claim 1, it is characterized in that: the scope that described drainage tube inserts in coal column is sieve tube segment, sieve tube segment is evenly provided with hole, the scope that described beam pipe inserts in coal column is horizontal spout section, beam pipe bottom end seal, horizontal spout section is perpendicular to beam pipe, and horizontal spout is uniformly distributed along 360 degree, beam tubular axis line.
3. improve a method for ground well drainage old dead zone coal bed gas extraction amount, adopt the system of the old dead zone extraction coal bed gas described in claim 1 or 2, it is characterized in that: comprise the following steps:
1) construction extraction drilling well (1) is carried out by ground to the coal column (3) between cavity, adjacent goaf (2), boring is beaten to coal column (3) bottom, the cotton being moistened with polyurethane is bundled respectively drainage tube (4) and beam pipe (5) uphole end and drainage tube (4), beam pipe (5) inserts the upper end of coal column range section, by drainage tube (4), coal column (3) base plate all delivered to by beam pipe (5), seal section I (6) and seal section II (19) is formed respectively at extraction drilling well (1) well head place and 0.5 ~ 2m place, coal column (3) top,
2) open valve I (8), valve III (14), refrigerating plant (15), heater (22), liquid booster pump (17) are worked, by ground CO
2gasholder (10) is successively through valve III (14), refrigerating plant (15), liquid CO
2storage tank (16), liquid booster pump (17), heater (22), valve I (8), pressure meter (23), continue injection 30 ~ 60MPa supercritical CO in beam pipe (5)
2, when pressure meter (23) registration rapid drawdown, valve-off I (8), valve III (14), stop jet pressure break;
3) open valve II (7) and carry out extraction through drainage tube (4) to coal bed gas by ground extraction station (11), record computer inspection, is designated as A;
4) when coal bed gas flow drops to 30% of computer inspection A, valve-off II (7), opens valve I (8), valve IV (13), by ground CO
2gasholder (10) injects 0.5 ~ 2MPaCO through valve IV (13), gas boosting pump (9), valve I (8) to beam pipe (5) successively
2gas 12 ~ 24h, valve-off I (8), valve IV (13), place 24 ~ 30h;
5) open valve II (7), continue to carry out extraction through drainage tube (4) to coal bed gas by ground extraction station (11);
6) repeat step 4 when coal bed gas flow drops to 30% of computer inspection A again), 5), until when coal bed gas flow finally drops to 16% of computer inspection A, valve-off II (7) stops coal bed gas extraction.
4. the method for the old dead zone extraction coal bed gas according to claims 3, is characterized in that: in described step 1), boring is beaten apart from base plate 0.5 ~ 1m to coal column, and seal section I (6) and seal section II (19) seal length are 3 ~ 5 meters.
5. the method for old dead zone extraction coal bed gas according to claim 3, it is characterized in that: the diameter of extraction drilling well in described step 1) is 250 ~ 350mm, the diameter of drainage tube and beam pipe is 100 ~ 150mm, and beam pipe lowermost end seals, and the horizontal nozzle diameter of horizontal spout section is 2 ~ 8mm.
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| US20220251956A1 (en) * | 2021-02-08 | 2022-08-11 | Taiyuan University Of Technology | Multi-level cross mining areas surface well pattern deployment method |
| US11649701B2 (en) * | 2021-02-08 | 2023-05-16 | Taiyuan University Of Technology | Multi-level cross mining areas surface well pattern deployment method |
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