CN104564031A - Method for measuring pressure of gas in coal seam in fracture rock stratum - Google Patents
Method for measuring pressure of gas in coal seam in fracture rock stratum Download PDFInfo
- Publication number
- CN104564031A CN104564031A CN201410810418.9A CN201410810418A CN104564031A CN 104564031 A CN104564031 A CN 104564031A CN 201410810418 A CN201410810418 A CN 201410810418A CN 104564031 A CN104564031 A CN 104564031A
- Authority
- CN
- China
- Prior art keywords
- hole
- pressure
- coal
- rock
- boring
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
Abstract
The invention discloses a method for measuring pressure of gas in a coal seam in a fracture rock stratum. The method comprises the following steps of firstly, penetrating the seam, measuring the pressure, drilling and tapping to form an outer rock drill hole; after sleeving a borehole orifice-pipe, fixing the pipe and passing the pressure-tight test, continuously going deep into the drill hole to form an inner rock drill hole, then secondary grouting and solidifying the inner rock drill hole; sweeping the hole and drilling along the borehole orifice-pipe again, forming a coal drill hole after coal can be seen from the drill hole, inserting a pressure measuring pipe into the inner rock drill hole, and utilizing expanded synthetic resin to coordinate with a grout stop belt to block two ends of the inner rock drill hole of the drill hole to form a closed chamber; after grouting is performed for the third time in the closed chamber, mounting a pressure gage and observing for 20-30d and recording. Through drilling and grouting processes for multiple times, tight hole sealing and multilayer high-pressure grouting, as well as the functions of thoroughly blocking circumferential cracks of rocks, enhancing hole sealing quality and separating gas in the hole are realized. The method is strong in applicability, and can be adopted no matter how complex the geological conditions are.
Description
Technical field
The present invention relates to coal gas pressure measurement technical field, be specifically related to method for measuring gas pressure of coal bed in a kind of fractured rock.
Background technology
Coal-bed gas pressure is the important indicator whether evaluation one lump coal layer has outburst hazard, but coal-bed gas pressure affects by different assay methods and different geological conditionss, and real coal-bed gas pressure is difficult to effectively be measured.When utilizing layer-through drilling to measure coal-bed gas pressure, if rock crack is grown or hole-sealing technology falls behind, the interior gas that is easy to cause in practical measurement to hole overflows in a large number, and this is the main cause that build-up of pressure manifests distortion.
Determination of coal seam gas pressure can be divided into initiatively manometric method and passive manometric method according to the difference of sealing of hole mode, the pressure measurement capsule that instrument mainly squeezed into by emulsion by active manometric method makes it expand, thus reach the object of shutoff boring, (be generally 5 d ~ 15 d) to observe by a period of time, the pressure meter utilizing aperture to install can read the concrete numerical value of coal-bed gas pressure, but this kind of method only adapts to without complex geological structure and the place of rock densification, inapplicable for the rock stratum of cranny development.Passive manometric method is conventional two kinds, be respectively: a, employing synthetic resin sealing of hole, namely the isodiametric pressure measuring drill hole of drilling machine construction one is utilized, piezometer tube is inserted in boring, utilize synthetic resin filling pressure measuring drill hole, but because the synthetic resin internal void after expanding is large, the effect of enclosed high pressure methane gas can not be played, therefore not easily apply.B, employing synthetic resin coordinate injection hole sealing, namely the isodiametric boring of drilling machine construction one is utilized, piezometer tube is inserted in boring, utilize the synthetic resin shutoff drilling rock section two ends after expanding, make to form a closed chamber in the middle part of boring, then adopt the mode of slip casting this closed chamber to be filled up, observed by a period of time, the concrete numerical value of the pressure meter utilizing aperture to install readable coal output layer gas pressure.Although this kind of method can play certain effect, but boring pressure-bearing weak effect, be unfavorable for high-pressure slip-casting, the foreign material such as interior coal, rock dust of being holed affect, easily cause between the slurry after solidifying and borehole wall and produce interface, add the impact in crag crack, high pressure gas still has spillover in boring, and therefore this kind of method is also not suitable for measuring in fractured rock.
Summary of the invention
The object of the invention is, by rock section high-pressure slip-casting in boring, to make rock fracture shutoff thoroughly tight, stop that gas outwards overflows along rock face crack may, thus reach thorough shutoff boring and finally measure real coal-bed gas pressure.
Object of the present invention is by realizing with under type: method for measuring gas pressure of coal bed in fractured rock, comprises the steps: that (1) wears the drill bit drilling depth a that layer pressure measuring drill hole perforate employing diameter is d1, forms the boring of outer rock; (2) in rock boring outside, intubating length is a, diameter is the orifice tube of d2, d1 > d2, thus orifice tube and outer rock are holed and formed annular gap; Use cement paste to fill annular gap after the external port of shutoff annular gap admittedly to manage; (3) carry out withstand voltage test to water filling in orifice tube after solidifying 48h, test pressure is not less than 6MPa, and stable at least 10min is water-tight is qualified, otherwise slip casting again; (4) admittedly manage qualified rear employing diameter be d3 drill bit along orifice tube cleaning bottom of hole creep into seat earth (descending hole drill proceeds to roof) mud stone place stop construction, formed in rock boring, interior rock drillable length is not less than 15m, d2 > d3; Then carry out secondary grouting to this interior rock boring, secondary grouting pressure is not less than 4MPa, and stable at least 10min rear stopping without exception, solidifies 48h; (5) again creep into along orifice tube cleaning bottom of hole, after coal is shown in boring, (coring drill rod that diameter is 73mm can be utilized to get coal sample) continues to creep into until enter roof (base plate) 0.5m through coal seam, and form coal borer hole, drilling construction terminates; (6) inwardly insertion is slightly shorter than coal borer hole depth and head end is provided with the piezometer tube of discharge in rock boring, utilizes the synthetic resin after expanding to coordinate the two ends of rock boring in grout stop belt shutoff boring, makes boring mid portion form a closed chamber; (7) to slip casting in closed chamber, during slip casting, Stress control is at 2 ~ 3MPa, and slip casting terminates rear observation more than 30min, if without exception, slip casting success be described, setting pressure table on piezometer tube, observe 20 ~ 30d, and make a record.
The present invention compared with prior art has the following advantages:
1, by repeatedly holing and repeatedly grouting process, sealing of hole is tight, and multi-level high-pressure slip-casting, reaches thorough shutoff rock circumferential crack, strengthens sealing quality, the effect of gas in isolated hole.Applicability is strong, no matter how complexity all can adopt geological conditions.
2, to be holed by outer rock and interior rock is holed two kinds of different pore sizes, in conjunction with the design of orifice tube, can guarantee can not produce interface between the slurry after solidifying and borehole wall, avoid crag crack problem, effectively prevent high pressure gas from spillover in boring, this kind of method is particluarly suitable for measuring in fractured rock.
Accompanying drawing explanation
Accompanying drawing 1 is the pressure measurement sealing of hole schematic diagram of the inventive method.
Sequence number in figure: 1, coal seam; 2, discharge; 3, grout stop belt; 4, synthetic resin; 5, slurry; 6,133mm aperture; 7, orifice tube; 8, wireway; 9, piezometer tube; 10, pressure meter; 11, Grouting Pipe; 12, crag.
Detailed description of the invention
The present invention will be described further by reference to the accompanying drawings.
As shown in Figure 1, method for measuring gas pressure of coal bed in fractured rock, comprises the steps: that (1) is worn layer pressure measuring drill hole perforate and adopted diameter to be that the drill bit of 133mm creeps into 6m; (2) insert the orifice tube 7 that 6m long diameter is 108mm in the borehole, use after shutoff orifice tube 7 periphery cement paste fill orifice tube 7 outside space admittedly manage; (3) carry out withstand voltage test to water filling in orifice tube 7 after solidifying 48h, test pressure is not less than 6MPa, stablizes 10min water-tight for qualified, otherwise slip casting again; (4) admittedly manage qualified rear employing diameter be 89mm drill bit along orifice tube 7 cleaning bottom of hole creep into seat earth (descending hole drill proceeds to roof) mud stone place stop construction (petrosal foramen length is not less than 15m), then secondary grouting is carried out to this boring, secondary grouting pressure is not less than 4MPa, stablize 10min rear stopping without exception, solidify 48h; (5) again creep into along orifice tube 7 cleaning bottom of hole, after coal is shown in boring, (coring drill rod that diameter is 73mm can be utilized to get coal sample) continues to creep into coal seam 1 until form coal borer hole through coal seam 1, coal borer hole distance from bottom roof (or base plate) 0.5m, drilling construction terminates; (6) insert and be slightly shorter than the piezometer tube that drilling depth head end is provided with discharge in boring, utilize the synthetic resin after expanding to coordinate the two ends of grout stop belt shutoff drilling rock section, make boring mid portion form a closed chamber; The wireway 8 be communicated in described enclosed cavity is also installed; (7) to slip casting in closed chamber, during slip casting, Stress control is at 2 ~ 3MPa, and slip casting terminates rear observation 30min, if without exception, slip casting success be described, setting pressure table on piezometer tube, observe 20 ~ 30d, and make a record.
Claims (3)
1. a method for measuring gas pressure of coal bed in fractured rock, its method is, comprises the steps:
(1) wear the drill bit drilling depth a that layer pressure measuring drill hole perforate employing diameter is d1, form the boring of outer rock;
(2) in rock boring outside, intubating length is a, diameter is the orifice tube of d2, d1 > d2, thus orifice tube and outer rock are holed and formed annular gap; Use cement paste to fill annular gap after the external port of shutoff annular gap admittedly to manage;
(3) carry out withstand voltage test to water filling in orifice tube after solidifying 48h, test pressure is not less than 6MPa, and stable at least 10min is water-tight is qualified, otherwise slip casting again;
(4) admittedly manage qualified rear employing diameter be d3 drill bit along orifice tube cleaning bottom of hole creep into seat earth mud stone place stop construction, formed in rock boring, interior rock drillable length is not less than 15m, d2 > d3; Then carry out secondary grouting to this interior rock boring, secondary grouting pressure is not less than 4MPa, and stable at least 10min rear stopping without exception, solidifies 48h;
(5) again creep into along orifice tube cleaning bottom of hole, continue to creep into after coal is shown in boring until enter roof 0.5m through coal seam, form coal borer hole, drilling construction terminates;
(6) inwardly insertion is slightly shorter than coal borer hole depth and head end is provided with the piezometer tube of discharge in rock boring, utilizes the synthetic resin after expanding to coordinate the two ends of rock boring in grout stop belt shutoff boring, makes boring mid portion form a closed chamber;
(7) to slip casting in closed chamber, during slip casting, Stress control is at 2 ~ 3MPa, and slip casting terminates rear observation more than 30min, if without exception, slip casting success be described, setting pressure table on piezometer tube, observe 20 ~ 30d, and make a record.
2. method for measuring gas pressure of coal bed in fractured rock according to claim 1, its method is, in step (5), be that the coring drill rod of 73mm creeps into along orifice tube cleaning bottom of hole with diameter, continue to creep into after coal is shown in boring until enter roof through coal seam.
3. method for measuring gas pressure of coal bed in fractured rock according to claim 1, its method is, is also provided with the wireway be communicated in described enclosed cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410810418.9A CN104564031A (en) | 2014-12-24 | 2014-12-24 | Method for measuring pressure of gas in coal seam in fracture rock stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410810418.9A CN104564031A (en) | 2014-12-24 | 2014-12-24 | Method for measuring pressure of gas in coal seam in fracture rock stratum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104564031A true CN104564031A (en) | 2015-04-29 |
Family
ID=53081016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410810418.9A Pending CN104564031A (en) | 2014-12-24 | 2014-12-24 | Method for measuring pressure of gas in coal seam in fracture rock stratum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104564031A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350953A (en) * | 2015-12-11 | 2016-02-24 | 湖南科技大学 | Measuring method for coal seam gas pressure in complicated geological condition |
| CN106121612A (en) * | 2016-06-29 | 2016-11-16 | 山东科技大学 | The method improving hypotonicity coal-bed gas hole pumping and mining efficiency |
| CN109162703A (en) * | 2018-10-16 | 2019-01-08 | 华北科技学院 | A kind of soft suitable coal bed drilling multistage on-line pressure sealant pressure measuring unit of overlength and method |
| CN109252856A (en) * | 2018-10-25 | 2019-01-22 | 中冶集团武汉勘察研究院有限公司 | The vertical packer permeability test water-stopping method to intercept water with lateral water blockoff is carried out by boring aperture variation |
| CN109709297A (en) * | 2018-12-05 | 2019-05-03 | 中国矿业大学(北京) | Based on the lower method for measuring multiple seam gas bearing capacity simultaneously to layer-through drilling |
| CN110080717A (en) * | 2019-06-17 | 2019-08-02 | 中国矿业大学 | A kind of gas pressure measurement method of horizontal drilling rapid hole sealing |
| CN111456723A (en) * | 2020-04-08 | 2020-07-28 | 中国矿业大学 | One-hole dual-purpose method for overburden three-zone detection and rock stratum movement monitoring |
| CN111963150A (en) * | 2020-08-27 | 2020-11-20 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN113153273A (en) * | 2021-03-18 | 2021-07-23 | 华能煤炭技术研究有限公司 | Coal bed gas pressure measuring structure and measuring method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070062693A1 (en) * | 2005-09-21 | 2007-03-22 | Vetco Gray Inc. | System, method, and apparatus for degassing tool for coal bed methane gas wells |
| CN102003173A (en) * | 2010-10-29 | 2011-04-06 | 北京中矿天安科技发展有限公司 | System and method for automatically measuring and recording gas pressure during coal seam hole sealing |
| CN102383781A (en) * | 2011-07-15 | 2012-03-21 | 河南理工大学 | Method for measuring gas pressure of coal bed |
| CN103015984A (en) * | 2012-12-19 | 2013-04-03 | 河南焦煤能源有限公司科学技术研究所 | Method for measuring gas pressure of coal seam by casing high-pressure hole sealing method |
| CN103075148A (en) * | 2013-02-19 | 2013-05-01 | 中国矿业大学 | Method and device for fast measuring coal bed gas pressure through upward remote-distance hole drilling |
| CN103742129A (en) * | 2013-12-30 | 2014-04-23 | 中国矿业大学 | Method for drilling holes on soft coal seam to measure coal seam gas pressure |
-
2014
- 2014-12-24 CN CN201410810418.9A patent/CN104564031A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070062693A1 (en) * | 2005-09-21 | 2007-03-22 | Vetco Gray Inc. | System, method, and apparatus for degassing tool for coal bed methane gas wells |
| CN102003173A (en) * | 2010-10-29 | 2011-04-06 | 北京中矿天安科技发展有限公司 | System and method for automatically measuring and recording gas pressure during coal seam hole sealing |
| CN102383781A (en) * | 2011-07-15 | 2012-03-21 | 河南理工大学 | Method for measuring gas pressure of coal bed |
| CN103015984A (en) * | 2012-12-19 | 2013-04-03 | 河南焦煤能源有限公司科学技术研究所 | Method for measuring gas pressure of coal seam by casing high-pressure hole sealing method |
| CN103075148A (en) * | 2013-02-19 | 2013-05-01 | 中国矿业大学 | Method and device for fast measuring coal bed gas pressure through upward remote-distance hole drilling |
| CN103742129A (en) * | 2013-12-30 | 2014-04-23 | 中国矿业大学 | Method for drilling holes on soft coal seam to measure coal seam gas pressure |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350953A (en) * | 2015-12-11 | 2016-02-24 | 湖南科技大学 | Measuring method for coal seam gas pressure in complicated geological condition |
| CN106121612A (en) * | 2016-06-29 | 2016-11-16 | 山东科技大学 | The method improving hypotonicity coal-bed gas hole pumping and mining efficiency |
| CN106121612B (en) * | 2016-06-29 | 2019-02-12 | 山东科技大学 | The method for improving low-permeability coal-bed gas hole pumping and mining efficiency |
| CN109162703A (en) * | 2018-10-16 | 2019-01-08 | 华北科技学院 | A kind of soft suitable coal bed drilling multistage on-line pressure sealant pressure measuring unit of overlength and method |
| CN109252856A (en) * | 2018-10-25 | 2019-01-22 | 中冶集团武汉勘察研究院有限公司 | The vertical packer permeability test water-stopping method to intercept water with lateral water blockoff is carried out by boring aperture variation |
| CN109709297A (en) * | 2018-12-05 | 2019-05-03 | 中国矿业大学(北京) | Based on the lower method for measuring multiple seam gas bearing capacity simultaneously to layer-through drilling |
| CN110080717A (en) * | 2019-06-17 | 2019-08-02 | 中国矿业大学 | A kind of gas pressure measurement method of horizontal drilling rapid hole sealing |
| CN110080717B (en) * | 2019-06-17 | 2021-05-28 | 中国矿业大学 | Gas pressure measuring method for rapid hole sealing of horizontal drilling |
| CN111456723A (en) * | 2020-04-08 | 2020-07-28 | 中国矿业大学 | One-hole dual-purpose method for overburden three-zone detection and rock stratum movement monitoring |
| CN111456723B (en) * | 2020-04-08 | 2021-07-09 | 中国矿业大学 | One-hole dual-purpose method for overburden three-zone detection and rock stratum movement monitoring |
| CN111963150A (en) * | 2020-08-27 | 2020-11-20 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN111963150B (en) * | 2020-08-27 | 2023-08-22 | 安徽理工大学 | Coal bed gas pressure measuring device and using method |
| CN113153273A (en) * | 2021-03-18 | 2021-07-23 | 华能煤炭技术研究有限公司 | Coal bed gas pressure measuring structure and measuring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104564031A (en) | Method for measuring pressure of gas in coal seam in fracture rock stratum | |
| CN103742129B (en) | The method of weak seam measuring gas pressure of coal bed by drilling hole | |
| CN103075148B (en) | On to the method for remotely drilling Fast Measurement coal-bed gas pressure and device thereof | |
| CN103075149B (en) | Method and device for quickly determining gas pressure of coal bed in downward superdeep borehole | |
| CN103485759A (en) | Oil-gas well hydraulically-created-fracture expansion visualization experiment method and oil-gas well hydraulically-created-fracture expansion visualization experiment device | |
| CN104005415B (en) | The efficient forming construction method thereof of diaphram wall in light weathered granite | |
| CN106245626A (en) | A kind of hard formation churning driven enters method | |
| CN102383781B (en) | Method for measuring gas pressure of coal bed | |
| CN110748380B (en) | Method for building salt cavern gas storage | |
| CN105221129B (en) | A kind of hydraulic pressure demolition, which is opened, splits CO2Take the reservoir anti-reflection method of proppant pressure break | |
| CN103015986A (en) | Method for directly measuring gas pressure of coal bed of underground coal mine | |
| CN204436370U (en) | Determination of coal seam gas pressure structure in fractured rock | |
| CN105804692B (en) | A kind of new-type coal mine gas piezometry slip-casting hole-sealing method | |
| CN106483045A (en) | For testing the experimental rig of Inter-zonal packing performance and method after cement sheath perforation | |
| CN103075150A (en) | In-situ stress testing method of method for relieving stress in original hole site for multiple times | |
| CN203476320U (en) | Device for simultaneously determining pressure of coal bed gas through capsule grouting | |
| CN102944906A (en) | Precise search observation method for form and evolutionary process of crack of coal-mine roof | |
| JP6929179B2 (en) | Hydraulic characterization method | |
| CN204126636U (en) | A kind of water proof rising borehole pressure tester | |
| CN105951704A (en) | Testing apparatus and method for on-site standard water injection by bore hole | |
| CN205384380U (en) | Tubular metal resonator combination formula coal mining water guide crack area height measurement device | |
| CN104389587A (en) | Quick measurement method of coal seam gas pressure | |
| CN207406345U (en) | Rich water sand-pebble layer shield tunnel end horizontal grouting ruggedized construction | |
| CN110644492B (en) | Comprehensive grouting construction method for steep dip angle wide-crack stratum | |
| CN206530301U (en) | A kind of geologic drilling rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Bai Kexin Inventor after: Chen Yu Inventor after: Wei Yongjian Inventor after: He Dongsheng Inventor after: Dai Linju Inventor after: Xu Yunwang Inventor after: Ding Jian Inventor before: Bai Kexin Inventor before: Chen Yu Inventor before: Wei Yongjian Inventor before: Wang Yimin Inventor before: Bai Kexin, Chen Yu, Wei Yongjian, Wang Yimin, Qie Limin |
|
| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150429 |
|
| RJ01 | Rejection of invention patent application after publication |