CN106014345B - A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed - Google Patents

A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed Download PDF

Info

Publication number
CN106014345B
CN106014345B CN201610446295.4A CN201610446295A CN106014345B CN 106014345 B CN106014345 B CN 106014345B CN 201610446295 A CN201610446295 A CN 201610446295A CN 106014345 B CN106014345 B CN 106014345B
Authority
CN
China
Prior art keywords
dead zone
bed gas
coal bed
old dead
extraction
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.)
Active
Application number
CN201610446295.4A
Other languages
Chinese (zh)
Other versions
CN106014345A (en
Inventor
冯国瑞
李振
姜海纳
白锦文
张钰亭
高强
闫永敢
张玉江
康立勋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiyuan University of Technology
Original Assignee
Taiyuan University of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Taiyuan University of Technology filed Critical Taiyuan University of Technology
Priority to CN201610446295.4A priority Critical patent/CN106014345B/en
Publication of CN106014345A publication Critical patent/CN106014345A/en
Application granted granted Critical
Publication of CN106014345B publication Critical patent/CN106014345B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006Production of coal-bed methane

Abstract

The invention discloses the pumping method that a kind of lower part caving method exploits the compound old dead zone coal bed gas to be formed, the present invention is by construction level well at 1 ~ 5 meter above the old dead zone fissure zone in lower part, carrying out coal bed gas extraction;When coal bed gas extraction amount drops to the 10% ~ 20% of Q, implements staged fracturing and to old dead zone coal bed gas extraction again, when coal bed gas extraction amount is re-lowered to the 10% ~ 20% of Q, injection supercritical carbon dioxide is gas displacing coal-bed;Extraction is carried out again until extraction amount falls to 6m3Stop extraction when/min.This method solve when original simple old dead zone using ground vertical drilling extraction, extraction drilling well and the old effective contact area of dead zone reservoir are small, extraction is limited in scope problem;The old dead zone coal bed gas resource in top will be closed on while the extraction lower layer old dead zone coal bed gas in position together in extraction, save cost;Simultaneously horizontal well be located in rock stratum, avoid the hoistway that drilling well occurs in coal seam cave in, blocking accident.

Description

A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed
Technical field
The present invention relates to the pumping methods that a kind of lower part caving method exploits the compound old dead zone coal bed gas to be formed, and belong to extraction Coal bed gas technical field.
Background technology
Since long-term industrialization is exploited, there is countless numerous, the huge old dead zones of area in China.Only it is with Shanxi Province Example ended for the end of the year 2013, and Shanxi Province shares more than 4700 abandoned mines, and for old dead zone area up to 5000 square kilometres, these are old The excavation of dead zone be mostly using the lower old-fashioned blast-winning technology of recovery ratio, coal mining rate generally 50% ~ 60%, It is even lower, therefore above-mentioned old dead zone preservation considerable coal bed gas resource gas reserves, related data is shown only with mountain About 30 billion cubic meter of old dead zone Coal bed gas project for west saves.Gas is a kind of clean energy resource, and coal bed gas is remained to old dead zone Recovery energy, the situation of China's natural gas insufficient supply can be effectively relieved;Gas is as a kind of pernicious gas, discharge simultaneously It is 21 times of carbon dioxide to generated greenhouse effects in air, therefore has to the methane drainage and utilization project of this part gas good Economic benefit and environmental benefit.
It is directed to extraction of the extraction primarily directed to the old dead zone gas of single working face of old dead zone gas at present, method is From ground, into old dead zone top fissure zone, construction ground drilling well is with the old dead zone gas of extraction, during such method wellbore construction Difficulty of construction is big, accident rate is high, one-tenth porosity is low.And a ground pit shaft can only be directed to an old dead zone and carry out extraction, The methane output of extraction is low and of high cost.Chinese patent CN105114038A discloses a kind of by supercritical CO2Jet stream pressure Split the method for the adjacent old old dead zone gas of empty interval coal column extraction same level two;Chinese patent CN104696006A is disclosed A method of penetrating the old old dead zone remnants coal bed gas of dead zone abandoned coal pillar extraction multilayer of multilayer.
The above method is that the multiple old dead zone gas of vertical shaft extraction are made that important exploration.However, above-mentioned patent there is Ground vertical drilling and the problems such as coalbed methane reservoir contact surface is small, extraction is limited in scope, extracting result is bad.
In fact, often preservation is in coalfield in the form of multilayer coal is separated by a certain distance in coal seam in coalfield, upper layer and lower layer Coal mining will form compound old dead zone after completing.Due to history and mining conditions limitation etc., existing is compound old Coal resources recovery ratio is limited when dead zone is exploited(Mostly below 60%), inside contain the coal bed gas resource of considerable amount, The collaboration extraction for being directed to compound old dead zone at present is still in opposite blank stage.
Invention content
In view of the above-mentioned problems, the present invention maximizes exploitation from coal bed gas resource while considering the angle of economic cost, It is proposed it is a kind of by top tool post method lower part caving method exploit the compound old dead zone to be formed and up and down be all made of caving method exploit shape At the method that goes out of compound old dead zone coal bed gas extraction simultaneously, solve existing coal bed gas resource abandon adopt caused by vast resources Wasting phenomenon.
The present invention provides the pumping methods that a kind of lower part caving method exploits the compound old dead zone coal bed gas to be formed, including with Lower step:
(1)According to mine shaft geology digging data, integrated use physical prospecting means determine that underground top, underlying seam have been opened The old dead zone parameter dug(Excavate range, cavity, coal column distribution situation in old dead zone), between the old dead zone in the old dead zone in lower part and top Distance parameter;
(2)From above the coal column of old dead zone boundary at corresponding ground location at 1 ~ 5 meter above the old dead zone fissure zone in lower part Construction level well;
Horizontal well by underground earthward extended spot can be divided into horizontal well horizontal segment, inclination section, horizontal well vertical section with And horizontal well ground surface end, horizontal well ground surface end are divided into two branches by threeway:Drainage tube and beam pipe, wherein drainage tube one are collateral Road is connected with valve I, and beam pipe side branch is connected with valve II, and horizontal well end near the ground is sealed, and there is sealing device on ground;
(3)Valve I on ground is opened, coal bed gas extraction is carried out by drainage tube, while recording coal in the unit interval at this time Layer gas extraction amount Q;
(4)When coal bed gas extraction amount falls to the 10% ~ 20% of Q in the unit interval, by horizontal well horizontal segment every 10 ~ 30 Rice is divided into several staged fracturing sections, is pressure break spacer between each staged fracturing section, a length of 3 ~ 10 meters of pressure break spacer is torn open It is with horizontal well fracturing technology that more than staged fracturing section until top is old by well head decentralization staged fracturing equipment to unload threeway Rock stratum pressure break between the bottom plate of dead zone;
(5)Again threeway is installed, and carries out wellhead sealing, the valve I on drainage tube is opened, coal is carried out by drainage tube again Layer gas extraction;
(6)When coal bed gas extraction amount falls to the 10% ~ 20% of Q again in the unit interval, valve I is closed, opens valve II, by being pressed into temperature in the lateral old dead zone of beam pipe one it is 32 ~ 40 DEG C, the supercritical CO that pressure is 8 ~ 12MPa212 ~ 36 is small When, wait for 24 ~ 36h quietly;
(7)It is again turned on valve I, closes valve II, coal bed gas extraction is carried out by drainage tube again;
(8)When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed, stops pumping 8 ~ 24 hours, Opening valve I later, reducing extraction pressure continues coal bed gas extraction simultaneously;When coal bed gas extraction amount is again in the unit interval When falling to 10% or less Q, it is again switched off valve I, stops pumping 8 ~ 24 hours, is again turned on valve I later, reduces extraction pressure Carry out coal bed gas extraction;Recycle the above-mentioned process for stopping pumping-decompression extraction, until extraction pressure reduction to force down 80 than air ~ 100kpa;
(9)When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
In said program, the horizontal well vertical section is passed through from the coal column of old dead zone boundary, the water with boundary coal column end Flat distance is 10 ~ 60 meters, and the vertical depth of horizontal well horizontal segment is excavated the top fissure zone of the old dead zone in the lower part formed by underlying seam Development height determine that the kickoff point (KOP) of horizontal well inclination section is chosen then by fixed horizontal well horizontal segment, horizontal well vertical section Layer position and live drilling technology determine.
In said program, the staged fracturing technology is:Casing Limited entry fracturing, multiple-string packer staged fracturing, waterpower spray Penetrate one kind in fracturing technique.
In said program, the old dead zone is that top tool post formula lower part is caving the compound old dead zone of formula or the upper and lower formula that is caving is answered Close old dead zone.
The present invention cooperates with the angle of extraction from coal bed gas resource, by the remaining a large amount of coals in the old dead zone in top and lower part Layer gas resource is taken into account simultaneously, it is proposed that a kind of innovative approach of collaboration extraction coal bed gas.This method efficiently solves original When merely using the old dead zone of ground vertical drilling extraction, extraction drilling well and the old effective contact area of dead zone reservoir be small, extraction range Limited problem;The old dead zone coal bed gas resource in top will be closed on while the extraction lower layer old dead zone coal bed gas in position together in extraction Come, has accomplished that a well is multi-purpose, greatly saved cost;Horizontal well is located at the interlayer between the old dead zone in top and lower part simultaneously Rock stratum avoids drilling well directly when beating to coal seam, since coal seam excessively loose and occurring hoistway cave-in accident and hoistway are blocked up Plug accident.
Description of the drawings
Fig. 1 is the schematic diagram of 1 extraction coal bed gas of the embodiment of the present invention.
Fig. 2 is the schematic diagram of 2 extraction coal bed gas of the embodiment of the present invention.
In figure, 1, drainage tube, 2, valve I, 3, valve II, 4, beam pipe, 5, horizontal well vertical section, 6, boundary coal column, 7, Inclination section, 8, the old dead zone in lower part, 9, the old dead zone fissure zone in lower part, 10, staged fracturing section, 11, pressure break spacer, 12, horizontal well Horizontal segment, 13, the old dead zone in top, 14, horizontal well, 15, seal section;16, sealing device;17, threeway, 18 staged fracturing cracks.
Specific implementation mode
It is further illustrated the present invention below by embodiment, but is not limited to following embodiment.
Embodiment 1:The method that extraction top tool post lower part caving method exploits the compound old dead zone coal bed gas to be formed
The present embodiment is by taking Jin Mei groups Yue Cheng mine working faces as an example, as shown in Figure 1, illustrates the pumping method of the invention. Yue Cheng mines are seated Qinshui coalfield, which is abundant one of the important coalfield of China's coal bed gas resource, and within the scope of coalfield field with "nine squares" Interior minable coal seam is No. 9, No. 15 coal seams in No. 3 coal seams and Taiyuan Forma-tion of Shanxi group.Due to history and the backwardness of recovery method Etc. reasons, No. 3 coal recovery ratios of main mining coal seam are low in coalfield, are retained in a large amount of coals in underground, old dead zone Coal bed gas project is quite rich It is rich.No. 9 coals of girdle for being 47.16 meters with 3 coal seam floor average headways, the coal that is averaged is 1 meter thick, and when two layers of upper layer and lower layer position, coal is opened When to dig the old dead zone formed be that top tool post formula lower part is caving formula compound old dead zone, to solve the collaboration exploitation of coal bed gas resource, The invention provide specific method be:
1)It is comprehensive simultaneously according to the existing geology digging data such as coal mine excavation situation, coal seam block diagram, surface-underground contrast plan The old dead zone parameter that underground top, underlying seam have been excavated is determined with physical prospecting means(Include mainly that model is excavated in old dead zone It encloses, cavity, coal column distribution situation etc.), the parameters such as the distance between the old dead zone in lower part and the old dead zone in top;
2)By old dead zone boundary coal column(6)The ground location of top is to the old dead zone fissure zone in lower part(9)It constructs at 2 meters of top Horizontal well(14),
Horizontal well(14)By underground, earthward extended spot can be divided into horizontal well horizontal segment(12), inclination section(7), it is horizontal Well vertical section(5)And horizontal well ground surface end, wherein horizontal well ground surface end is by threeway(17)It is divided into two branches, drainage tube(1) Side branch is connected with valve I(2), beam pipe(4)Side branch is connected with valve II(3), horizontal well end near the ground is sealed into Seal section(15), there is sealing device on ground(16);Sealing water mud and mortar sealing.
3)Open valve I on ground(2), by drainage tube(1)Coal bed gas extraction is carried out, while being recorded in the unit interval at this time Coal bed gas extraction amount Q;
4)When coal bed gas extraction amount falls to the 20% of Q in the unit interval, by horizontal well horizontal segment(12)It is drawn every 20 meters It is divided into several staged fracturing sections(10), it is pressure break spacer between each staged fracturing section(11), pressure break spacer(11)A length of 5 Rice dismantles threeway(17)Staged fracturing equipment is transferred by well head, with horizontal well fracturing technology by staged fracturing section(10) Above until the old dead zone in top(13)Rock stratum pressure break between bottom plate makes to generate lateral, longitudinal crack between the rock stratum of this layer of position, link up The old dead zone in top(13)With horizontal well(14);
5)Again threeway is installed(17), and wellhead sealing is carried out, open valve I(2), again by drainage tube(1)Carry out coal Layer gas extraction;
6)When coal bed gas extraction amount falls to the 20% of Q again in the unit interval, valve I is closed(2), open valve II (3), by beam pipe(4)Into old dead zone be pressed into temperature be 32 DEG C, the supercritical CO that pressure is 9MPa236 hours, it is small to wait for 24 quietly When;
7)It is again turned on valve I(2)Close valve II(3), again by drainage tube(1)Carry out coal bed gas extraction;
8)When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed(2), stop taking out 8 hours, Valve I is opened later(2)Reducing extraction pressure continues coal bed gas extraction simultaneously;When coal bed gas extraction amount is again in the unit interval It is secondary when falling to 10% or less Q, it is again switched off valve I(2), stop taking out 8 hours, be again turned on valve I later(2), reduce again Extraction pressure carries out coal bed gas extraction;The above-mentioned process for stopping pumping-decompression extraction is recycled, until extraction pressure reduction is to than atmospheric pressure Low 80kpa;
9)When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
Above-mentioned horizontal well vertical section(5)From old dead zone boundary coal column(6)In pass through, the horizontal distance with boundary coal column end It is 40 meters, horizontal well horizontal segment(12)Vertical depth the old dead zone in the lower part formed is excavated by underlying seam(8)The old dead zone in top split Gap band(9)Development height determine, horizontal well inclination section(7)Kickoff point (KOP) choose then by fixed horizontal well horizontal segment (12), horizontal well vertical section(5)Layer position and live drilling technology determine.
The staged fracturing equipment divided into above-mentioned horizontal well orientation staged fracturing is needed according to which kind of segmentation specifically used Fracturing technique determines that specific staged fracturing technology can be casing Limited entry fracturing, multiple-string packer staged fracturing, waterpower spray Any one of fracturing technique is penetrated, needs that field working conditions and completion mode is combined to determine in specific implementation.
Embodiment 2:Extraction upper and lower are all made of the method that caving method exploits the compound old dead zone coal bed gas to be formed
Below by taking Jin Mei groups Shanxi sage's coal mine working face as an example, illustrate the inventive method.Shanxi sage's coal mine is seated Qinshui Coalfield, the coalfield are abundant one of the important coalfields of China's coal bed gas resource, and minable coal seam is Shanxi in field with "nine squares" within the scope of coalfield No. 9, No. 15 coal seams in No. 3 coal seams and Taiyuan Forma-tion of group.Due to backwardness of history and recovery method etc., master adopts in coalfield The coal recovery ratio of coal seam 3 is low, is retained in a large amount of coals in underground, and old dead zone Coal bed gas project is quite abundant.Between being averaged with 3 coal seam floors Away from No. 9 coals of girdle for 53.20 meters, the coal that is averaged is 0.81 meter thick, and when two layers of upper layer and lower layer position, coal excavates the old dead zone to be formed When to be caving the old dead zone of formula up and down, to solve the collaboration exploitation of compound old dead zone coal bed gas resource, the specific side which provides Method is:
1)It is comprehensive simultaneously according to the existing geology digging data such as coal mine excavation situation, coal seam block diagram, surface-underground contrast plan The old dead zone parameter that underground top, underlying seam have been excavated is determined with physical prospecting means(Include mainly that model is excavated in old dead zone It encloses, cavity, coal column distribution situation etc.), the parameters such as the distance between the old dead zone in lower part and the old dead zone in top;
2)By old dead zone boundary coal column(6)The ground location of top is to the old dead zone fissure zone in lower part(9)It is applied at 1.6 meters of top Work horizontal well(14),
By underground, earthward extended spot can be divided into horizontal well horizontal segment to horizontal well(12), inclination section(7), horizontal well hang down Straight section(5)And horizontal well ground surface end, wherein horizontal well ground surface end is by threeway(17)It is divided into two branches, drainage tube(1)Side Branch is connected with valve I(2), beam pipe(4)Side branch is connected with valve II(3), horizontal well end near the ground is sealed into sealing Section(15), there is sealing device on ground(16);Sealing is sealed by cement and mortar.
3)Open valve I on ground(2), by drainage tube(1)Coal bed gas extraction is carried out, while being recorded in the unit interval at this time Coal bed gas extraction amount Q;
4)When coal bed gas extraction amount falls to the 20% of Q in the unit interval, by horizontal well horizontal segment(12)It is drawn every 18 meters It is divided into several staged fracturing sections(10), it is pressure break spacer between each staged fracturing section(11), pressure break spacer(11)A length of 6 Rice dismantles threeway(17)Staged fracturing equipment is transferred by well head, with horizontal well fracturing technology by staged fracturing section(10) Above until the old dead zone in top(13)Rock stratum pressure break between bottom plate makes to generate lateral, longitudinal crack between the rock stratum of this layer of position, link up The old dead zone in top(13)With horizontal well(14);
5)Again threeway is installed(17), and wellhead sealing is carried out, open valve I(2), again by drainage tube(1)Carry out coal Layer gas extraction;
6)When coal bed gas extraction amount falls to the 20% of Q again in the unit interval, valve I is closed(2), open valve II (3), by beam pipe(4)Into old dead zone be pressed into temperature be 36 DEG C, the supercritical CO that pressure is 10MPa226 hours, wait for 30 quietly Hour;
7)It is again turned on valve I(2)Close valve II(3), again by drainage tube(1)Carry out coal bed gas extraction;
8)When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed(2), stop taking out 14 hours, Valve I is opened later(2)Reducing extraction pressure continues coal bed gas extraction simultaneously;When coal bed gas extraction amount is again in the unit interval It is secondary when falling to 10% or less Q, it is again switched off valve I(2), stop taking out 14 hours, be again turned on valve I later(2), drop again Low extraction pressure carries out coal bed gas extraction;The above-mentioned process for stopping pumping-decompression extraction is recycled, until extraction pressure reduction is to than air Force down 88kpa;
9)When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
Above-mentioned horizontal well vertical section(5)From old dead zone boundary coal column(6)In pass through, the horizontal distance with boundary coal column end It is 30 meters, horizontal well horizontal segment(12)Vertical depth the old dead zone in the lower part formed is excavated by underlying seam(8)The old dead zone in top split Gap band(9)Development height determine, horizontal well inclination section(7)Kickoff point (KOP) choose then by fixed horizontal well horizontal segment (12), horizontal well vertical section(5)Layer position and live drilling technology determine.
The staged fracturing equipment divided into above-mentioned horizontal well orientation staged fracturing is needed according to which kind of segmentation specifically used Fracturing technique determines that specific staged fracturing technology can be casing Limited entry fracturing, multiple-string packer staged fracturing, waterpower spray Any one of fracturing technique is penetrated, needs that field working conditions and completion mode is combined to determine in specific implementation.

Claims (5)

1. a kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed, it is characterised in that:Including following Step:
(1)According to mine shaft geology digging data, integrated use physical prospecting means determine that underground top, underlying seam have been excavated Old dead zone parameter, the distance between the old dead zone in lower part and the old dead zone in top parameter;Old dead zone parameter include old dead zone excavate range, Cavity, coal column distribution situation;
(2)To construction at 1 ~ 5 meter above the old dead zone fissure zone in lower part at from the corresponding overhead surface position of old dead zone boundary coal column Horizontal well;
By underground, earthward extended spot can be divided into horizontal well horizontal segment, inclination section, horizontal well vertical section and water to horizontal well Horizontal well ground surface end, horizontal well ground surface end are divided into two branches by threeway:Drainage tube and beam pipe, wherein drainage tube side branch connect There are valve I, beam pipe side branch to be connected with valve II, horizontal well end near the ground is sealed, and there is sealing device on ground;
(3)Valve I on ground is opened, coal bed gas extraction is carried out by drainage tube, while recording coal bed gas in the unit interval at this time Extraction amount Q;
(4)When coal bed gas extraction amount falls to the 10% ~ 20% of Q in the unit interval, horizontal well horizontal segment is drawn every 10 ~ 30 meters It is divided into several staged fracturing sections, is pressure break spacer, a length of 3 ~ 10 meters of pressure break spacer, dismounting three between each staged fracturing section It is logical to use horizontal well fracturing technology by the more than staged fracturing section until old dead zone in top by well head decentralization staged fracturing equipment Rock stratum pressure break between bottom plate;
(5)Again threeway is installed, and carries out wellhead sealing, the valve I on drainage tube is opened, coal bed gas is carried out by drainage tube again Extraction;
(6)When coal bed gas extraction amount falls to the 10 ~ 20% of Q again in the unit interval, valve I is closed, opens valve II, by Beam pipe is pressed into the supercritical CO that implantation temperature is 32 ~ 40 DEG C, pressure is 8 ~ 12MPa into old dead zone212 ~ 36 hours, wait for quietly 24~36h;
(7)It is again turned on valve I, closes valve II, coal bed gas extraction is carried out by drainage tube again;
(8)When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed, stops pumping 8 ~ 24 hours, later Opening valve I, reducing extraction pressure continues coal bed gas extraction simultaneously;When coal bed gas extraction amount declines again in the unit interval For Q 10% or less when, be again switched off valve I, stop pumping 8 ~ 24 hours, be again turned on valve I later, reduce extraction pressure and carry out Coal bed gas extraction;The above-mentioned process for stopping pumping-decompression extraction is recycled, until extraction pressure reduction extremely forces down 80 ~ 100kpa than air;
(9)When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
2. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special Sign is:The horizontal well vertical section is passed through from the coal column of old dead zone boundary, and the horizontal distance with boundary coal column end is 10 ~ 60 Rice, the development height that the vertical depth of horizontal well horizontal segment is excavated the top fissure zone of the old dead zone in the lower part formed by underlying seam are determined Fixed, the kickoff point (KOP) of horizontal well inclination section is chosen then by fixed horizontal well horizontal segment, the layer position of horizontal well vertical section and existing Field drilling technology determines.
3. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special Sign is:Horizontal well fracturing technology is:Casing Limited entry fracturing, multiple-string packer staged fracturing, hydraulic jetting fracturing technology In one kind.
4. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special Sign is:The old dead zone is that top tool post formula lower part is caving the compound old dead zone of formula.
5. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special Sign is:The old dead zone is to be caving the compound old dead zone of formula up and down.
CN201610446295.4A 2016-06-21 2016-06-21 A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed Active CN106014345B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610446295.4A CN106014345B (en) 2016-06-21 2016-06-21 A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610446295.4A CN106014345B (en) 2016-06-21 2016-06-21 A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed

Publications (2)

Publication Number Publication Date
CN106014345A CN106014345A (en) 2016-10-12
CN106014345B true CN106014345B (en) 2018-11-13

Family

ID=57085447

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610446295.4A Active CN106014345B (en) 2016-06-21 2016-06-21 A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed

Country Status (1)

Country Link
CN (1) CN106014345B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109162676B (en) * 2018-09-27 2020-11-17 太原理工大学 Method for simultaneously extracting and utilizing coal bed gas and accumulated water in goaf
CN111980631A (en) * 2020-08-11 2020-11-24 太原理工大学 Method for collaborative gas extraction of goaf and underlying coal seam
CN112145132A (en) * 2020-10-12 2020-12-29 山西晋城无烟煤矿业集团有限责任公司 Well drilling method for extracting coal bed gas of adjacent closed goaf group

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007124378A2 (en) * 2006-04-21 2007-11-01 Osum Oil Sands Corp. Method of drilling from a shaft for underground recovery of hydrocarbons
CN102678092A (en) * 2012-04-01 2012-09-19 河南省煤层气开发利用有限公司 Method for commonly extracting coal and coal bed gas by up-hole and down-hole joint construction
CN104018813A (en) * 2014-05-31 2014-09-03 贵州盘江煤层气开发利用有限责任公司 Coal bed gas exploitation method
CN104131831A (en) * 2014-06-12 2014-11-05 中国矿业大学 Coal-bed gas well vertical three-dimensional united extraction method
CN105114038A (en) * 2015-08-04 2015-12-02 太原理工大学 System and method for increasing drainage quantity of coal bed gas of ground well drainage goaf
CN105625946A (en) * 2016-01-25 2016-06-01 中国石油大学(北京) Coalbed methane horizontal well supercritical CO2 jet flow cavity construction and multi-segment synchronous deflagration fracturing method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007124378A2 (en) * 2006-04-21 2007-11-01 Osum Oil Sands Corp. Method of drilling from a shaft for underground recovery of hydrocarbons
CN102678092A (en) * 2012-04-01 2012-09-19 河南省煤层气开发利用有限公司 Method for commonly extracting coal and coal bed gas by up-hole and down-hole joint construction
CN104018813A (en) * 2014-05-31 2014-09-03 贵州盘江煤层气开发利用有限责任公司 Coal bed gas exploitation method
CN104131831A (en) * 2014-06-12 2014-11-05 中国矿业大学 Coal-bed gas well vertical three-dimensional united extraction method
CN105114038A (en) * 2015-08-04 2015-12-02 太原理工大学 System and method for increasing drainage quantity of coal bed gas of ground well drainage goaf
CN105625946A (en) * 2016-01-25 2016-06-01 中国石油大学(北京) Coalbed methane horizontal well supercritical CO2 jet flow cavity construction and multi-segment synchronous deflagration fracturing method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"煤矿采空区瓦斯富集机制研究";胡胜勇等;<中国安全科学学报>;20160229;第26卷(第2期);第122-127页 *

Also Published As

Publication number Publication date
CN106014345A (en) 2016-10-12

Similar Documents

Publication Publication Date Title
CN102852546B (en) Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area
CN106089291B (en) A kind of method for cooperateing with extraction to be caving the old dead zone of formula and lower coal seam coal bed gas
CN101275469B (en) Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method
US8287050B2 (en) Method of increasing reservoir permeability
CN106089290B (en) A kind of method for cooperateing with the old dead zone of extraction tool post formula and lower coal seam coal bed gas
CN105927191B (en) A kind of old dead zone of tool post formula and the method for lower coal seam coal bed gas unitized production
CN102337919B (en) A four-period-five-purpose hole-drilling high-efficiency gas extracting process
CN102979498B (en) A kind of multi-lateral horizontal well system for coal bed gas
CN102392678A (en) Gas drainage method combining surface and underground fracturing and permeability improvement
CN102392677A (en) Permeability improvement technology for coal bed gas reservoir cap by using three-dimensional fracture network modification
CN105804786B (en) A kind of weak seam bottom plate layer-through drilling pressure rushes anti-reflection method
CN104131831A (en) Coal-bed gas well vertical three-dimensional united extraction method
CN104712358A (en) Coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of working face of first mining total rock pressure relief
WO2015103861A1 (en) Method for extracting gas by drilling hole in gob-side entry retaining y-type ventilation high-position return airway
CN110397428B (en) Displacement coalbed methane yield increasing method for coalbed methane jointly mined by vertical well and U-shaped butt well
CN106014345B (en) A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed
CN104989339A (en) Old goaf coalbed methane extracting and mining system and method
CN104929567A (en) Low-cost construction process for passing through goaf
CN110242301A (en) A kind of modified water-protection coal-mining method of two step slip casting of top plate water-bearing layer
CN105971563B (en) A kind of lower part tool post method exploits the pumping method for the compound old dead zone coal bed gas to be formed
CN107905834A (en) A kind of hypotonic high prominent coal seam architecture gas production method
CN108843320A (en) Shift to an earlier date outburst elimination method in the tunnel of coal mine tight roof full face
CN108756884A (en) Coal mine tight roof full face ground shifts to an earlier date outburst elimination method
CN110043309A (en) Close the method for arranging and well bore installation method of the gas drainage well of coal mine
CN105239964A (en) Protective coal seam decompressing ground and underground three-dimensional coal and coal seam gas coordinated development method

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
GR01 Patent grant