CN104929567A - Low-cost construction process for passing through goaf - Google Patents

Low-cost construction process for passing through goaf Download PDF

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Publication number
CN104929567A
CN104929567A CN201510213176.XA CN201510213176A CN104929567A CN 104929567 A CN104929567 A CN 104929567A CN 201510213176 A CN201510213176 A CN 201510213176A CN 104929567 A CN104929567 A CN 104929567A
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CN
China
Prior art keywords
goaf
well
drilling
cement
coal
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.)
Pending
Application number
CN201510213176.XA
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Chinese (zh)
Inventor
李俊峰
王军
赵小山
翟德锁
赵晓龙
何丽娜
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.)
Easy Peace Blue-Flame Coal And Coal Bed Gas Gong Cai Technology Co Ltd
SHANXI LANYAN COALBED METHANE CO Ltd
SHANXI LANYAN COALBED METHANE GROUP CO Ltd
Original Assignee
Easy Peace Blue-Flame Coal And Coal Bed Gas Gong Cai Technology Co Ltd
SHANXI LANYAN COALBED METHANE CO Ltd
SHANXI LANYAN COALBED METHANE GROUP CO Ltd
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 Easy Peace Blue-Flame Coal And Coal Bed Gas Gong Cai Technology Co Ltd, SHANXI LANYAN COALBED METHANE CO Ltd, SHANXI LANYAN COALBED METHANE GROUP CO Ltd filed Critical Easy Peace Blue-Flame Coal And Coal Bed Gas Gong Cai Technology Co Ltd
Priority to CN201510213176.XA priority Critical patent/CN104929567A/en
Publication of CN104929567A publication Critical patent/CN104929567A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to the technical field of coal gas mining, particularly relates to a low-cost construction process for passing through a goaf and aims to realize passing through a broken and collapsed belt of a permian formation to extract coal gas of carboniferous formation lower group coal. The low-cost construction process includes: adopting a three-holing well body structure for on-ground well drilling, and holing to bed rock for the first time; holing to a position of 22m below a baseplate of the goaf for the second time, lowering a bilayer sleeve, sealing and fixing a bottom port of the bilayer sleeve, and pouring cement between the bilayer sleeve and a well wall for well cementation; holing to a position of 50m below a baseplate of a lower group coal layer for the third time to finish drilling, lowering an inner-layer sleeve, performing well cementation and depth returning to the baseplate of the goaf, and performing well completion after solidification. No sleeve for replacing a drill rod is used, but conventional sleeves are adopted; red soil is filled between the bilayer sleeve and the well wall, cement paste is utilized to intrude the broken belt above the goaf, and the cement is utilized between the bilayer sleeve below the goaf and the well wall for well cementation to stabilize the goaf, so that the circumstance that a drill bit and a wellhole are buried caused by breaking and collapsing of the goaf can be prevented effectively.

Description

A kind of low cost passes through goaf construction technology
Technical field
The invention belongs to Coal-seam Gas Recovery Technologies field, be specifically related to a kind of low cost and pass through goaf construction technology.
Background technology
Part mining area coal-bearing strata is Permo-Carboniferous system stratum, and lower group of minable coal seam is contained on coal stratum, and group minable coal seam is contained on two folded stratum.Such mining area Metamorphic degree of seam is high, earth history period, not there is not a large amount of loss of gas because violent geological structure causes into coal-formed gas (the being mainly methane gas) phase, ton coal coal bed gas (coal mine gas) content is high, before carrying out coal mining, need to take ground coal bed gas well and down-hole extraction borehole extraction coal bed gas (coal mine gas), after reducing ton coal coal bed gas (coal mine gas) content, coal mining can be carried out.
Bury by coal that the depth, coal are thick, technology complexity, exploitation economy etc. affect, exploited for two folded containing of stratum in Permian System mining area ordinary priority and organized shallow-layer high seam, cause and above coal stratum, to define fragmentation to subside band, passing through in gob well work progress, the goaf fragmentation formed after passing through group coal mining subside band time, the fragmentation band that subsides can cause bury drills head, bury the problem of wellhole.Affecting by two folded stratum being organized fragmentation that coal mining the formed band that subsides, under causing effectively taking conventional coal bed gas ground well drainage coal stratum, organizing coal coal bed gas (coal mine gas).
Summary of the invention
The present invention to be subsided band to realize passing through two folded stratum crushings, and extraction coal organizes coal coal bed gas under stratum, and then provides a kind of low cost and pass through goaf construction technology.
A kind of low cost passes through goaf construction technology, and ground drilling adopts three to drive a well body structure, and its concrete steps are:
One opens: utilize drilling rod to drive drill bit one perforate to basement rock, and layer sleeve pipe to aperture bottom well cementing of cement, cement returns to ground;
Two open: adopt air DTH drilling to open below two perforates to gob floor 22m, then go up exhaust gas hidden hole drilling, under enter rock bit cunning eye, full well without hindrance rear under enter two layers of sleeve pipe, mouth at the bottom of sealing two layers of sleeve pipe, at two layers of well cementing of cement between sleeve pipe and the borehole wall, cement invades zone of fracture, Hou Ning;
Three open: utilize drill bit conventional mud to bore three perforates to 50m place finishing drilling below lower group of seat earth, under enter inner layer sleeve, cementing the well to return is deep to gob floor, Hou Ning completion.
Described two open in drilling process, and air latent drift top connects pressure fan, and sealing wellhead when creeping into connecting duct, to away from well head region, inject water liquid sand discharge at well head simultaneously.
Two layers of described sleeve pipe are connected with retracting device.
The described two two perforate top mouths opened in drilling process form seal area by cement returning shutoff.
Described three open in drilling process, and aperture is provided with preventer.
The present invention has following beneficial effect:
1, the present invention is on conventional drilling Process ba-sis, adds the instruments such as air compressor (blast machine) and down-hole hammer, efficiently can complete the drilling well of passing through goaf, can meet lower road pressing crack construction operation;
2, two spud in into time, by filling laterite between sleeve pipe and the borehole wall and the zone of fracture of above goaf formed after utilizing cement paste to invade to organize coal mining at two layers, two layers again below goaf utilize well cementing of cement between sleeve pipe and the borehole wall, make goaf firm, can effectively prevent goaf fragmentation to cave in bury drills head, wellhole;
3, compared with other the technique crossing goaf, the present invention does not use and replaces the sleeve pipe of drilling rod, employing be conventional cannula, and and common drilling technology combine and can realize goaf, therefore cost is low.
Accompanying drawing explanation
Fig. 1 is the casing programme schematic diagram of work progress of the present invention;
In figure: 1-cement, 2-bis-layers of sleeve pipe, 3-surface pipe, 4-retracting device, 5-seal area, 6-fill area, 7-goaf, 8-inner layer sleeve, 9-coal seam, A-mono-perforate, B-bis-perforate, C-tri-perforate.
Detailed description of the invention
As shown in Figure 1, cause bury drills head, bury wellhole when band is subsided in goaf (7) fragmentation formed after organize coal mining on passing through, ground drilling construction employing three drives a well body structure.Its Specific construction step is as follows:
One opens: utilize drilling rod to drive φ 444.5mm drill bit one perforate A to basement rock, and bottom lower φ 377.7mm surface pipe 3 to perforate A and well cementing of cement, cement returns to ground.
Two open: adopt φ 311.1mm air DTH drilling to open two perforate B, its top with a pressure fan (according to the situation of creeping into, in good time two pressure fans in parallel), during air DTH drilling, well head adopts special device sealing, and connecting duct is to away from well head, injects float water gaging liquid, take precautions against downhole safety and be beneficial to sand discharge at well head simultaneously.Down-the-hole hammer drill proceeds to coal seam goaf base plate less than 7 22m, then exhaust gas hidden hole drilling is gone up, under enter the sliding eye of φ 311.1mm rock bit, full well without hindrance rear under enter φ 244.5mm bis-layers of sleeve pipe 2, sealing two layers of sleeve pipe 2 end mouth, well cementing of cement between two layers of sleeve pipe 2 and the borehole wall, cement invades zone of fracture, Hou Ning.In work progress, the top mouth of two perforate B forms seal area 5 by cement returning shutoff, with the fuel gas loss in safety guarantee crack to well head, utilizes the retracting device 4 that two layers of sleeve pipe 2 connect to reclaim construction material simultaneously.
Three open: utilize φ 215.9mm drill bit conventional mud to creep into, preventer is installed in aperture, to drill below lower group of coal seam 9 base plate finishing drilling three perforate C after 50m, under enter φ 139.7mm inner layer sleeve 8, return at inner layer sleeve 8 well cementing of cement between the borehole wall and be deep to goaf 7 base plate, cement invades zone of fracture, Hou Ning completion.
In construction technological process of the present invention, following safety requirements need be met:
1, forbid in drill site to use naked light and smoking;
2, two spud in into time, monitor well implication amount, concentration at any time, if gas density exceeds standard, uses water drilling instead;
3, after three spudding wells pressure testing terminate, fill laterite at two walls that drive a well, ensure that follow-up inner layer sleeve 8 is straight, then drive a well in wall two and inject cement paste, shutoff crack, prevent fuel gas by crack loss to well head.
The component not making specified otherwise in the present invention is prior art.

Claims (5)

1. low cost passes through a goaf construction technology, and ground drilling adopts three to drive a well body structure, it is characterized in that concrete steps are:
One opens: utilize drilling rod to drive drill bit one perforate (A) to basement rock, and layer sleeve pipe (3) is to a perforate (A) bottom also well cementing of cement, cement returns to ground;
Two open: adopt air DTH drilling to open below two perforates (B) to goaf (7) base plate 22m, then exhaust gas hidden hole drilling is gone up, under enter the sliding eye of rock bit, full well without hindrance rear under enter two layers of sleeve pipe (2), sealing two layers of sleeve pipe (2) end mouth, well cementing of cement between two layers of sleeve pipe (2) and the borehole wall, cement invades zone of fracture, Hou Ning;
Three open: utilize drill bit conventional mud to bore three perforates (C) to 50m place finishing drilling below lower group of coal seam (9) base plate, under enter inner layer sleeve (8), cementing the well to return is deep to goaf (7) base plate, Hou Ning completion.
2. low cost according to claim 1 passes through goaf construction technology, be characterised in that: described two open in drilling process, air latent drift top connects pressure fan, and sealing wellhead when creeping into connecting duct, to away from well head region, inject water liquid sand discharge at well head simultaneously.
3. low cost according to claim 1 passes through goaf construction technology, is characterised in that: two layers of described sleeve pipe (2) are connected with retracting device (4).
4. pass through goaf construction technology according to low cost according to claim 1, be characterised in that: described 2 two perforates (B) of opening in drilling process are pushed up mouth and formed seal area (5) by cement returning shutoff.
5. low cost according to claim 1 passes through goaf construction technology, is characterised in that: described three open in drilling process, and aperture is provided with preventer.
CN201510213176.XA 2015-04-30 2015-04-30 Low-cost construction process for passing through goaf Pending CN104929567A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106761543A (en) * 2016-12-02 2017-05-31 淮北矿业股份有限公司 A kind of method that section is missed by goaf that drills
CN107620581A (en) * 2017-07-31 2018-01-23 山西晋城无烟煤矿业集团有限责任公司 The construction method of the dual-purpose mine shaft inspection hole of one well
CN107816366A (en) * 2017-10-25 2018-03-20 吉林大学 A kind of multilayer goaf filling well is into well engineering method
CN109057795A (en) * 2018-08-29 2018-12-21 山西晋城无烟煤矿业集团有限责任公司 It is a kind of to cross goaf coal bed gas ground drilling method
CN109403923A (en) * 2018-09-28 2019-03-01 山西晋城无烟煤矿业集团有限责任公司 A kind of coal bed gas T-type wears the short horizontal well construction method in goaf
CN110318706A (en) * 2019-07-15 2019-10-11 神华神东煤炭集团有限责任公司 A kind of method that drilling operation crosses goaf
CN110939407A (en) * 2018-09-25 2020-03-31 山西省煤炭地质勘查研究院 Double-deck overlapping goaf ground drainage well structure and recovery unit
CN111335936A (en) * 2020-03-20 2020-06-26 淮南矿业(集团)有限责任公司 Construction method of ground fire prevention and extinguishing channel of goaf target area
CN111411909A (en) * 2020-04-23 2020-07-14 山东省煤田地质局第一勘探队 Artificial wall building method for treating drilling engineering in coal mining subsidence area

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1693654A (en) * 2005-06-02 2005-11-09 淮南矿业(集团)有限责任公司 Gas pressure relief method of ground drilling extraction minery and goaf
CN102966304A (en) * 2012-11-28 2013-03-13 吉林大学 Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology
CN103835647A (en) * 2012-11-23 2014-06-04 四川省地质工程勘察院 Method for drilling floating pebble bed
CN104405281A (en) * 2014-10-20 2015-03-11 山西蓝焰煤层气集团有限责任公司 Casing drilling technique for over-goaf

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1693654A (en) * 2005-06-02 2005-11-09 淮南矿业(集团)有限责任公司 Gas pressure relief method of ground drilling extraction minery and goaf
CN103835647A (en) * 2012-11-23 2014-06-04 四川省地质工程勘察院 Method for drilling floating pebble bed
CN102966304A (en) * 2012-11-28 2013-03-13 吉林大学 Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology
CN104405281A (en) * 2014-10-20 2015-03-11 山西蓝焰煤层气集团有限责任公司 Casing drilling technique for over-goaf

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106761543A (en) * 2016-12-02 2017-05-31 淮北矿业股份有限公司 A kind of method that section is missed by goaf that drills
CN106761543B (en) * 2016-12-02 2019-07-19 淮北矿业股份有限公司 A method of drilling misses section by goaf
CN107620581A (en) * 2017-07-31 2018-01-23 山西晋城无烟煤矿业集团有限责任公司 The construction method of the dual-purpose mine shaft inspection hole of one well
CN107816366A (en) * 2017-10-25 2018-03-20 吉林大学 A kind of multilayer goaf filling well is into well engineering method
CN107816366B (en) * 2017-10-25 2019-06-07 吉林大学 A kind of multilayer goaf filling well is at well engineering method
CN109057795A (en) * 2018-08-29 2018-12-21 山西晋城无烟煤矿业集团有限责任公司 It is a kind of to cross goaf coal bed gas ground drilling method
CN110939407A (en) * 2018-09-25 2020-03-31 山西省煤炭地质勘查研究院 Double-deck overlapping goaf ground drainage well structure and recovery unit
CN109403923A (en) * 2018-09-28 2019-03-01 山西晋城无烟煤矿业集团有限责任公司 A kind of coal bed gas T-type wears the short horizontal well construction method in goaf
CN110318706A (en) * 2019-07-15 2019-10-11 神华神东煤炭集团有限责任公司 A kind of method that drilling operation crosses goaf
CN110318706B (en) * 2019-07-15 2021-06-04 神华神东煤炭集团有限责任公司 Method for drilling construction to pass through goaf
CN111335936A (en) * 2020-03-20 2020-06-26 淮南矿业(集团)有限责任公司 Construction method of ground fire prevention and extinguishing channel of goaf target area
CN111411909A (en) * 2020-04-23 2020-07-14 山东省煤田地质局第一勘探队 Artificial wall building method for treating drilling engineering in coal mining subsidence area

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Application publication date: 20150923