CN104453759A - Closed coring device for testing coal bed methane and rock formation gas contents in surface well drilling - Google Patents

Closed coring device for testing coal bed methane and rock formation gas contents in surface well drilling Download PDF

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Publication number
CN104453759A
CN104453759A CN201410739874.9A CN201410739874A CN104453759A CN 104453759 A CN104453759 A CN 104453759A CN 201410739874 A CN201410739874 A CN 201410739874A CN 104453759 A CN104453759 A CN 104453759A
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China
Prior art keywords
coring
core
spring
urceolus
coal
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CN201410739874.9A
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Chinese (zh)
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CN104453759B (en
Inventor
孙四清
张群
张培河
张阳
赵继展
刘柏根
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Xian Research Institute Co Ltd of CCTEG
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Xian Research Institute Co Ltd of CCTEG
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    • 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
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • 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
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • E21B25/02Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
    • E21B25/04Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe the core receiver having a core forming cutting edge or element, e.g. punch type core barrels

Abstract

The invention discloses a closed coring device for testing coal bed methane and rock formation gas contents in surface well drilling. The closed coring device comprises a coring inner barrel, a coring drill bit, an outer barrel, a power mechanism and a startup mechanism, wherein the outer barrel sleeves the coring inner barrel; a drill rod joint is arranged at one end of the outer barrel; the coring drill bit is arranged at the other end of the outer barrel; the power mechanism and the startup mechanism are arranged inside the outer barrel. The closed coring device can take a coal (rock) core sample in a fixed-point and closed way, effectively solves the technical problems that after the existing coring equipment takes a coal core, the exposure time of the sample is long, escape of lost gas is serious, content determination on gas (coal bed methane) is not accurate and the like, and further, provides more reliable basic data for coal mine gas disaster control, exploration and exploitation of coal bed methane resources, and the like.

Description

Ground drilling coal bed gas, rock stratum Gas content test sealing core drilling device
Technical field
The invention belongs to safety of coal mines and cbm exploration and development technique field, the present invention is specifically related to a kind of ground drilling coal bed gas, rock stratum Gas content test sealing core drilling device.
Background technology
Coal bed gas (gas) content is the important parameter characterizing coal seam reservoirs, is the important evidence of ground coal bed gas (gas) resource exploration, capability forecasting and well pattern layout design; At underground coal mine, coal bed gas (gas) content is the important evidence of Mine Gas Emission Prediction, Occurrence Regularity of coal bed gas research and Coal Seam Outburst Hazard prediction, Design of Mine Ventilation and the work such as lectotype selection and gas pumping engineering design.Therefore, study Accurate Measurement coal bed gas (gas) content coring equipment all to have important practical significance in coal bed gas resource exploration and development and coal mine gas hazard management etc.
At present, the sealing core drilling adopted in petroleum gas field or coring drilling with keep up pressure equipment are mainly used in the exploration and development of oil gas or gas hydrates, due to the special process of such equipment operating and the otherness in reservoir of oil and gas and coal seam, it is not suitable for the sample collection of coal bed gas (gas) content Accurate Measurement.In coal exploration and coal bed gas resource exploration process, generally adopt basket to carry out coal bed gas (gas) assay sample collection, this equipment leaks through in journey cruelly on sample collection, sample lifting and ground, coal core sample is in without air-tight state, the a large amount of gas of sample is lost in the process, causes coal bed gas (gas) assay to be forbidden.Sample collection in coal mine underground coal bed gas (gas) assay has three kinds of modes at present: one is fluted drill, this equipment can not extract the complete coal heart, the coal dust ground to form in drilling process can only be extracted in aperture, this equipment can not solve the gas loss problems in sample collection process, but also can not realize the fixed point collection of sample; Two is that monotubular or the bitubular are cored pipe, and this equipment still can not solve sample collection, move back gas loss problems in brill and coal heart taking-up process; Three is that down-hole has sealing core drilling equipment, and this equipment can realize sealing core drilling, but the complexity of this equipment operating technique, applicable elements are subject to certain restriction, and field popularization application receives certain restriction.
Summary of the invention
For solving the technical problem of existing existence, the embodiment of the present invention provides a kind of ground drilling coal bed gas, rock stratum Gas content to test sealing core drilling device.
For achieving the above object, the technical scheme of the embodiment of the present invention is achieved in that
The embodiment of the present invention provides a kind of ground drilling coal bed gas, rock stratum Gas content to test sealing core drilling device, this device comprises: coring inner drum, core bit, urceolus, actuating unit, actuating mechanism, sheathed coring inner drum in described urceolus, one end of described urceolus is provided with tool joint, the other end of described urceolus arranges core bit, be provided with between described coring inner drum and core bit and cut heart seal ball-valve, described actuating unit, actuating mechanism are all arranged in urceolus; Described actuating unit comprises spring, power tube, spring overhead gage, spring lower baffle plate, described power tube is arranged between urceolus and inner core, side between described power tube and urceolus sets gradually spring overhead gage, spring lower baffle plate, is provided with at least one spring between described spring overhead gage, spring lower baffle plate; Described actuating mechanism comprises stifled cylinder in startup steel ball, steel ball, starts pushing cylinder, described startup pushing cylinder is arranged on one end of coring inner drum, and be connected with the inner core top connection be arranged in coring inner drum, the side of described startup pushing cylinder is provided with upper sealing valve body, the end of described inner core top connection is connected with the coal heart baffle plate be vertically set in coring inner drum, arrange between described startup pushing cylinder and power tube and start stifled cylinder in steel ball, steel ball, described startup pushing cylinder is provided with bearing group near one end of tool joint.
In such scheme, one end of described power tube is provided with righting sleeve.
In such scheme, outside described inner core top connection, be arranged with sealing rubber ring.
Compared with prior art, beneficial effect of the present invention:
The present invention can realize fixed point and airtightly take coal (rock) heart sample, efficiently solve existing coring equipment sample open-assembly time after taking the coal heart long, the loss of loss gas is serious, the technical problems such as gas (coal bed gas) assay is inaccurate, and then provide more reliable basic data for aspects such as coal mine gas hazard management and coal bed gas resource exploration and developments.
Accompanying drawing explanation
The structural representation of a kind of ground drilling coal bed gas that Fig. 1 provides for the embodiment of the present invention, rock stratum Gas content test sealing core drilling device.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The embodiment of the present invention provides a kind of ground drilling coal bed gas, rock stratum Gas content test sealing core drilling device, as shown in Figure 1, this device comprises: coring inner drum 4, core bit 18, urceolus 2, actuating unit, actuating mechanism, sheathed coring inner drum 4 in described urceolus 2, one end of described urceolus 2 is provided with tool joint 1, the other end of described urceolus 2 arranges core bit 18, described tool joint 1 lower end is connected with urceolus 2 by screw thread, described urceolus 2 lower end is connected with core bit 18 by screw thread, described tool joint 1, urceolus 2, it is cylindric that core bit 18 formation and boring adapt, described urceolus 2 plays and connects drill bit 1 and drill string and the effect of transmitting rig moment of torsion and axial force, urceolus 2 intensity is had higher requirements, described actuating unit, actuating mechanism are all arranged in urceolus 2, and it is inner that described coring inner drum 4, actuating unit and actuating mechanism are encapsulated in urceolus 2, and described coring inner drum 4 adopts thread forms to pass through bearing group 5 to be connected with tool joint 1, described actuating unit comprises spring 14, power tube 3, push rod, spring overhead gage 13, spring lower baffle plate 15, described power tube 3 is arranged between urceolus 2 and coring inner drum 4, side between described power tube 3 and urceolus 2 sets gradually spring overhead gage 13, spring lower baffle plate 15, is provided with at least one spring 14 between described spring overhead gage 13, spring lower baffle plate 15, described actuating mechanism comprises startup steel ball 7, stifled cylinder 8 in steel ball, start pushing cylinder 9, described startup pushing cylinder 9 is arranged on one end of coring inner drum 4, and be connected with the inner core top connection 10 be arranged in coring inner drum 4, described inner core top connection 10 adopts with inner core 4 and is threaded, the end of described inner core top connection 1 is connected with the coal heart baffle plate 12 be vertically set in coring inner drum 4, arrange between described startup pushing cylinder 9 and power tube 3 and start steel ball 7, stifled cylinder 8 in steel ball, described startup pushing cylinder 9 is provided with bearing group 5 near one end of tool joint 1, described power tube 3 is fixed on coring inner drum 4 end by the position-limiting action starting steel ball 7, downside is by spring overhead gage 13, spring 14 compresses and fixes by spring lower baffle plate 15, described startup pushing cylinder 9 is connected with coal heart baffle plate 12 by screw thread, upper end supports stifled cylinder 8 in steel ball.
One end of described power tube 3 is provided with righting sleeve 15.
The side of described startup pushing cylinder 9 is provided with upper sealing valve body 6, is arranged with sealing rubber ring 11 outside described inner core top connection 1.Be provided with between described coring inner drum 4 and core bit 18 and cut heart seal ball-valve 17.Described seal compression rubber ring 11 adopts high temperature bond mode to be connected with coal heart baffle plate 12 and inner core top connection 10, described coring inner drum 4 lower end by screw thread with cut heart seal ball-valve 17 and be connected, described in cut heart seal ball-valve 17 lower end and core bit 18 end contact.
The present invention is connected with rig by drilling rod, and can be controlled in precalculated position and carry out coal core sample and take, along with the propelling of core drilling rig drilling rod, coal core sample constantly enters into sealing core drilling inner core 4.After coal core sample fills coring inner drum 4, coal core sample promotes coal heart baffle plate 12 and moves backward, and moves after driving the interior stifled cylinder 8 of steel ball, and actuating mechanism links, and closes the upper sealed valve 6 of coring inner drum 4 upper end; Start in steel ball 7 while moving after stifled cylinder 8 in described steel ball and move, start spring 14 pushing mechanism, promote to cut heart Sealing ball-valve 17, cut off the coal heart, and close coring inner drum 4 lower end ball valve.
The present invention relies on self impetus entering coring inner drum 4 sample to open actuating mechanism, the taking rate that guarantee is cored and success rate, actuating mechanism and spring and coordinated signals thereof are mechanism modes, by the control of the aspects such as sealing of drilling fluid and drilling fluid conveying pipeline, the whole processing efficient of coring of this equipment, quick, disturbing factor is few.According to the difference of coal of coring (rock) layer mechanical characteristic, freely can change dynamic structure (spring), there is good exchange performance, to ensure enough to cut power aroused in interest, realize sealing core drilling smoothly.

Claims (3)

1. a ground drilling coal bed gas, rock stratum Gas content test sealing core drilling device, it is characterized in that, this device comprises: coring inner drum (4), core bit (18), urceolus (2), actuating unit, actuating mechanism, sheathed coring inner drum (4) in described urceolus (2), one end of described urceolus (2) is provided with tool joint (1), the other end of described urceolus (2) arranges core bit (18), be provided with between described coring inner drum (4) and core bit (18) and cut heart seal ball-valve (17), described actuating unit, actuating mechanism is all arranged in urceolus (2), described actuating unit comprises spring (14), power tube (3), spring overhead gage (13), spring lower baffle plate (15), described power tube (3) is arranged between urceolus (2) and inner core (4), side between described power tube (3) and urceolus (2) sets gradually spring overhead gage (13), spring lower baffle plate (15), is provided with at least one spring (14) between described spring overhead gage (13), spring lower baffle plate (15), described actuating mechanism comprises startup steel ball (7), stifled cylinder (8) in steel ball, start pushing cylinder (9), described startup pushing cylinder (9) is arranged on one end of coring inner drum (4), and be connected with the inner core top connection (10) be arranged in coring inner drum (4), the side of described startup pushing cylinder (9) is provided with upper sealing valve body (6), the end of described inner core top connection (1) is connected with the coal heart baffle plate (12) be vertically set in coring inner drum (4), arrange between described startup pushing cylinder (9) and power tube (3) and start steel ball (7), stifled cylinder (8) in steel ball, described startup pushing cylinder (9) is provided with bearing group (5) near one end of tool joint (1).
2. ground drilling coal bed gas according to claim 1, rock stratum Gas content test sealing core drilling device, is characterized in that: one end of described power tube (3) is provided with righting sleeve (15).
3. ground drilling coal bed gas according to claim 1 and 2, rock stratum Gas content test sealing core drilling device, is characterized in that: be arranged with sealing rubber ring (11) outside described inner core top connection (1).
CN201410739874.9A 2014-12-08 2014-12-08 Ground drilling coal bed gas, rock stratum Gas content test sealing core drilling device Active CN104453759B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107806341A (en) * 2017-12-19 2018-03-16 焦作煤业(集团)有限责任公司 A kind of coal mine deep hole fixed point closed sampling device and sampling method
CN109916663A (en) * 2019-04-18 2019-06-21 中煤科工集团重庆研究院有限公司 A kind of dislocation closed type sealed sampling device and its application method
CN110454105A (en) * 2019-08-27 2019-11-15 中煤科工集团重庆研究院有限公司 Coal mine underground coal bed gas bearing capacity with boring in-situ test system and method
CN110700781A (en) * 2018-07-09 2020-01-17 中国石油化工股份有限公司 Shale fluid-retaining closed coring device and method
CN111236872A (en) * 2020-01-17 2020-06-05 中煤科工集团西安研究院有限公司 Directional rope core drill and drilling method thereof

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CN204327018U (en) * 2014-12-08 2015-05-13 中煤科工集团西安研究院有限公司 A kind of ground drilling coal bed gas, rock stratum Gas content test sealing core drilling device

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107806341A (en) * 2017-12-19 2018-03-16 焦作煤业(集团)有限责任公司 A kind of coal mine deep hole fixed point closed sampling device and sampling method
CN107806341B (en) * 2017-12-19 2020-09-15 焦作煤业(集团)有限责任公司 Coal mine deep hole fixed point airtight sampling device and sampling method
CN110700781A (en) * 2018-07-09 2020-01-17 中国石油化工股份有限公司 Shale fluid-retaining closed coring device and method
CN109916663A (en) * 2019-04-18 2019-06-21 中煤科工集团重庆研究院有限公司 A kind of dislocation closed type sealed sampling device and its application method
CN109916663B (en) * 2019-04-18 2021-06-08 中煤科工集团重庆研究院有限公司 Dislocation closed type sealed sampling device and using method thereof
CN110454105A (en) * 2019-08-27 2019-11-15 中煤科工集团重庆研究院有限公司 Coal mine underground coal bed gas bearing capacity with boring in-situ test system and method
CN111236872A (en) * 2020-01-17 2020-06-05 中煤科工集团西安研究院有限公司 Directional rope core drill and drilling method thereof

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