CN201241696Y - Geological exploration drill coal-bed gas pressure determinator - Google Patents

Geological exploration drill coal-bed gas pressure determinator Download PDF

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Publication number
CN201241696Y
CN201241696Y CNU2008200646733U CN200820064673U CN201241696Y CN 201241696 Y CN201241696 Y CN 201241696Y CN U2008200646733 U CNU2008200646733 U CN U2008200646733U CN 200820064673 U CN200820064673 U CN 200820064673U CN 201241696 Y CN201241696 Y CN 201241696Y
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CN
China
Prior art keywords
tube
spline housing
hole
pressure
piston
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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.)
Expired - Fee Related
Application number
CNU2008200646733U
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Chinese (zh)
Inventor
李子章
樊腊生
肖华
蒋太平
房勇
胡俊仁
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.)
CHENGDU PROSPECTING TECHNOLOGY RESEARCH DEVELOPMENT CO LTD
Luzhou Geological Survey And Construction Co Of Sichuan
PROSPECTING TECHNOLOGY INST CHINESE ACADEMY OF GEOLOGICAL SCIENCES
Institute of Exploration Technology Chinese Academy of Geological Sciences
Original Assignee
CHENGDU PROSPECTING TECHNOLOGY RESEARCH DEVELOPMENT CO LTD
Luzhou Geological Survey And Construction Co Of Sichuan
PROSPECTING TECHNOLOGY INST CHINESE ACADEMY OF GEOLOGICAL SCIENCES
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Application filed by CHENGDU PROSPECTING TECHNOLOGY RESEARCH DEVELOPMENT CO LTD, Luzhou Geological Survey And Construction Co Of Sichuan, PROSPECTING TECHNOLOGY INST CHINESE ACADEMY OF GEOLOGICAL SCIENCES filed Critical CHENGDU PROSPECTING TECHNOLOGY RESEARCH DEVELOPMENT CO LTD
Priority to CNU2008200646733U priority Critical patent/CN201241696Y/en
Application granted granted Critical
Publication of CN201241696Y publication Critical patent/CN201241696Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a coal bed gas pressure measurer for drill holes in geology exploration, which is composed of a packing torque transmission mechanism, a flow discharge channel, a pressure relief mechanism and a pressure meter. The packing torque transmission mechanism is composed of an upper adaptor, a center tube, an upper centralizing ring, a rubber sleeve, a middle ring, a lower centralizing ring, a spline socket head, a spline sleeve, a shear pin and a spline shaft, wherein the upper end of the upper adaptor is provided with a drill rod connecting structure, the spline sleeve is provided with a six-key internal spline, the spline shaft is provided with a three-key external spline. The flow discharge channel is composed of a flow discharge hole, a flow discharge pore channel and a flow discharge passage. The pressure relief mechanism is composed of a piston, a spring, an outer tube, a piston cover, a non-return cover nut, a non-return spring, a non-return pin, a hanging pin, a sealing short section, an inner tube, a sealing end cover and a lower adaptor, wherein the outer tube is provided with an outer tube through hole, the inner tube is provided with an inner tube through hole, the non-return cover nut, the non-return spring and the non-return pin are mounted in a radial hole of the piston cover, the lower end of the piston is connected with the sealing short section via the hanging pin, and the sealing short section is provided with a sealing short section through hole.

Description

The geological prospecting borehole coal-bed gas pressure measuring instrument
Technical field
The utility model relates to a kind of analyzer of measuring coal-bed gas pressure in geological prospecting borehole, and is particularly a kind of at deep hole, easily collapse and measure the geological prospecting borehole coal-bed gas pressure measuring instrument of coal-bed gas pressure in the boring.
Background technology
Coal-bed gas pressure is an important parameter of sign coal-bed gas flow behavior and occurrence status, be the basic parameter of decision coal seam gas-bearing capacity, Gas Flow power height and mash gas dynamic phenomenon, be estimate the coal mining condition, determine the safety of coal mines technical measures, an important evidence of development and use coal-bed gas.Grasp accurately and reliably the coal-bed gas pressure data to research with estimate that gas reserves, gas are gushed out, that Gas Flow, gas drainage under suction, gas are outstanding etc. is particularly important.The device of existing mensuration coal-bed gas pressure (calling pressure tester in the following text) is made up of packing device, pressure relief device, pressure gauge, supporting and regulating device in geological prospecting borehole, pressure tester is delivered in the boring to be measured by drilling rod, make packing device be in the better position of immediate roof hole wall in tested coal seam by supporting and regulating device, packing device comes boring top and the bottom packing, finishes the mensuration of coal-bed gas pressure again by pressure relief device and pressure gauge.This pressure tester does not have torsion pass mechanism and flushing liquor (mud or clear water) current by pass, be hampered in the way can not rotary drilling bits (being made up of drill string, pressure tester) boring down, can only by on carry drilling tool after, transfer drilling tool again, if repeatedly still can not be behind the put-on and delegated drilling tool by the hole section that is hampered, be lowered to pressure tester once more after can only carrying the brill cleaning bottom of hole, this shortcoming is very outstanding in the coal measure strata geological prospecting borehole; Pressure tester is a similar piston in boring, the drilling tool back pressure of boring too fast time band pressure tester down is big, pin is cut off in the strength that is hit effect easily in advance, makes pressure tester not arrive assigned address, particularly in, that the geological prospecting wire line coring of deep hole creeps in the boring this shortcoming is fairly obvious; Carry that the drilling tool (being made up of drill string, pressure tester) of similar piston produces swabbing action when boring in boring, bring out hole wall and collapse, cause drilling accident, serious even cause whole boring to be scrapped; The pressure of pressure measurement sensing element is counted mechanical type (spring-tube type) pressure bomb, and data read is slow, loaded down with trivial details.Therefore, existing boring is measured the coal-bed gas pressure device and is had certain defective, need improve.
The utility model content
The purpose of this utility model is that the structure of existing boring determination of coal seam gas pressure device is improved, and provides a kind of and can turn round cleaning bottom of hole, has current by pass, the reliable geological prospecting borehole coal-bed gas pressure measuring instrument of packing.
The technical scheme that its technical problem that solves the utility model adopts is: the analyzer columnar shape basal of geological prospecting borehole coal-bed gas pressure measuring instrument is made up of packing torsion pass mechanism, current by pass, pressure relief means thereon, pressure gauge.
The torsion pass of packing described in the utility model mechanism is by top connection, central tube, last guider ring, rubber tube, adapter ring, following guider ring, the spline housing joint, spline housing, shear pin, splined shaft is formed, the upper end of described top connection is provided with the drilling rod syndeton, the lower end of described top connection is connected with the upper end of central tube, the lower end of described central tube is connected with the upper end of splined shaft, described central tube is provided with discharge orifice, the described guider ring of going up, rubber tube, adapter ring, following guider ring, the spline housing fitting sleeve is contained on the central tube, the inboard of described rubber tube is provided with indent ball cambered surface, the lower end of described spline housing joint is connected with the upper end of spline housing, described spline housing joint is provided with the earial drainage duct, described spline housing is connected by the spline syndeton that cooperatively interacts with splined shaft and is located by shear pin, described spline housing is provided with six key internal splines, and described splined shaft is provided with the triple bond external splines.
Current by pass described in the utility model is made up of discharge orifice, earial drainage duct, earial drainage road, described discharge orifice is arranged on the central tube of hollow, described earial drainage duct is arranged on the spline housing joint, and described earial drainage road is formed by the spline housing of six key internal splines and the splined shaft cooperation of triple bond external splines.That is to say that the spline housing of described six key internal splines and the splined shaft fit clearance of triple bond external splines form the earial drainage road.
Pressure relief means thereon is by piston described in the utility model, spring, outer tube, piston cap, the non-return blind nut, check spring, the non-return pin, hang pin, packoff nipple, interior pipe, end cover, lower contact is formed, described piston and spring housing are contained in the cavity of resorption of splined shaft, the upper end of described outer tube is connected with the lower end of spline housing, the lower end of described outer tube is connected with the upper end of lower contact, described outer tube is provided with through hole in a certain suitable position, the lower end of described lower contact is provided with the support bar syndeton, the upper end of described piston cap is connected with the lower end of splined shaft, the lower end of described piston cap is connected with the upper end of interior pipe, pipe is provided with through hole in a certain suitable position in described, described non-return blind nut, check spring and non-return pin are installed in the radial hole of piston cap, the lower end of described piston is connected with packoff nipple by hanging pin, described packoff nipple is provided with through hole in a certain suitable position, in the inner chamber of pipe, the lower end of described interior pipe was connected with end cover in described packoff nipple was installed in.
Pressure gauge described in the utility model is connected on the end cover, is installed in the cavity of packoff nipple, interior pipe and end cover composition, and described pressure is counted the electronic type pressure bomb.The electronic type pressure bomb can adopt commercially available product in the utility model, as: PSE M series electronic pressure gauge that the electronic pressure gauge that the electronic pressure gauge that Hubei Jianghan Petroleum Instrument Co., Ltd produces, Wuhan benefit control Science and Technology Ltd. produce or Beijing Huayou Pioneer Petroleum Equipment Technologies Co., Ltd. produce or the like.
When using boring coal-bed gas pressure measuring instrument of the present utility model, allow the upper end of top connection and the lower end of drill string be connected, allow the lower end of lower contact and the support bar of certain-length be connected, the length of support bar determines that according to the position in coal seam and the requirement of sealing of hole the lower end of support bar is connected with drill bit.
When boring coal-bed gas pressure measuring instrument of the present utility model bores down, mud in the hole or clear water pass through the hollow of drill bit, support bar and lower contact successively, the earial drainage road of annulus, spline housing and the splined shaft of interior pipe and outer tube, the earial drainage duct of spline housing joint, the discharge orifice of central tube, enter in the inner chamber of central tube, top connection, drill string, from the drilling rod of aperture, return out, reach the back pressure of eliminating drilling tool, prevent cutting off in advance of pin, make the boring coal-bed gas pressure measuring instrument arrive appointed positions smoothly.
Under boring coal-bed gas pressure measuring instrument of the present utility model, bore when being hampered in the way, with rig abrasion drill roofbolt, moment of torsion successively by top connection, central tube, splined shaft, spline housing, outer tube, lower contact and support bar and pass to drill bit, expand and sweep the hole section that is hampered, until being lowered to smoothly, reach the purpose of not carrying brill midway, reduce the non-cutting time of measuring pressure, improve the efficient of measuring pressure.
At (drill bit that this moment, the support bar lower end connected prop up the hole at the bottom of) under the boring coal-bed gas pressure measuring instrument of the present utility model during to assigned address, the outside drill string and the kelly of rig are connected, with the weight of drill string or the oil cylinder pressurization of rig, pressure passes through drill string successively, top connection and central tube pass to splined shaft, cut off shear pin, after this pressure passes through drill string successively, top connection, last guider ring, rubber tube, adapter ring and rubber tube pass to down guider ring, the spline housing joint of following guider ring bottom, spline housing, outer tube, lower contact, support bar and drill bit prop up at the bottom of the hole, under the effect of pressure, force the rubber tube axial compression, expanded radially, be close to hole wall, the top and the bottom packing of will holing is come; Drill string, top connection, central tube, splined shaft, piston cap (containing piston, spring, non-return blind nut, check spring, non-return pin), interior pipe (contain and hang pin, packoff nipple), end cover (containing pressure gauge) move down successively in the rubber tube axial compression, the discharge orifice of central tube is by the sealing of the inwall of spline housing joint, and the through hole of interior pipe and the through hole of outer tube align substantially; At this moment send into pressure mud or clear water by the hollow part of drill string, pressure mud or clear water enter the inside of splined shaft by the cavity of top connection, central tube, compression piston, the promotion packoff nipple moves down, make the through hole alignment on packoff nipple and the interior pipe, at this moment the outer pressure-bearing mud of outer tube flows into and is equipped with in the manometric interior pipe, and internal and external pressure balance is finished release; Coal-bed gas also enters in the interior pipe by the through hole of alignment, is noted pressure data by the electronic type pressure bomb, reaches the purpose of pressure measurement.
After boring coal-bed gas pressure measuring instrument of the present utility model is finished determination of coal seam gas pressure, carry drilling tool on the releasing axial compression is also suitable, rubber tube restores to the original state rapidly, top connection, central tube, splined shaft, piston cap (containing piston, spring, non-return blind nut, check spring, non-return pin), interior pipe (contain and hang pin, packoff nipple), end cover (containing pressure gauge) move the earial drainage hole link of the discharge orifice of central tube and spline housing joint on successively; Carry brill this moment, the inner chamber that mud in the drilling rod or clear water pass through drill string, top connection, central tube successively, the discharge orifice of central tube, the earial drainage duct of spline housing joint, the earial drainage road of spline housing and splined shaft, the annulus of interior pipe and outer tube, enter in the hollow of lower contact, support bar and drill bit, add in the boring, reach the swabbing action of eliminating drilling tool, reduce destruction borehole wall.
Compared with the aforementioned existing similar products, owing to increased the spline syndeton of transfer torque in the packing device of boring coal-bed gas pressure measuring instrument of the present utility model, solved fully and time bored in the way because of the hole wall undergauge or fall the problem that is hampered of reasons such as piece, reached the purpose of not carrying brill midway, reduce the non-cutting time of measuring pressure, improved the efficient of measuring pressure.The setting of current by pass, solved rise, piston effect in the going down process, eliminated back pressure effect when time boring, prevented cutting off in advance of pin, eliminated swabbing action when pulling out of hole, reduced destruction hole wall, make work more reliable, reduce or avoided drilling accident.The setting of the indent ball cambered surface of rubber tube inboard has guaranteed that rubber tube effective expansion under the pressure of the drill effect also tightly is supported on the hole wall, strengthened the packing effect; Rubber tube can return to original state rapidly under cancellation the pressure of the drill, is convenient to timely trip-out.The employing of electronic type pressure bomb has improved the precision of determination of coal seam gas pressure, has shortened the time of reading pressure data.
Content of the present utility model further illustrates with the following Examples, but content of the present utility model is not limited only to content related among the embodiment.
Description of drawings
Fig. 1 is the epimere structural representation of geological prospecting borehole coal-bed gas pressure measuring instrument among the embodiment.
Fig. 2 is the hypomere structural representation of geological prospecting borehole coal-bed gas pressure measuring instrument among the embodiment.
Fig. 3 is A-A sectional view of Fig. 1.
Fig. 4 is B-B sectional view of Fig. 1.
Fig. 5 is the C portion partial enlarged drawing of Fig. 1.
Fig. 6 is D-D sectional view of Fig. 2.
Fig. 7 is the epimere structural representation of geological prospecting borehole coal-bed gas pressure measuring instrument packing boring duty among the embodiment.
Fig. 8 is the hypomere structural representation of geological prospecting borehole coal-bed gas pressure measuring instrument packing boring duty among the embodiment.
Fig. 9 is the epimere structural representation of the release of geological prospecting borehole coal-bed gas pressure measuring instrument, pressure measurement duty among the embodiment.
Figure 10 is the hypomere structural representation of the release of geological prospecting borehole coal-bed gas pressure measuring instrument, pressure measurement duty among the embodiment.
The specific embodiment
Shown in Fig. 1~10, the boring coal-bed gas pressure measuring instrument in the present embodiment is made up of packing torsion pass mechanism, current by pass, pressure relief means thereon, pressure gauge.
The torsion pass of packing described in present embodiment mechanism is by top connection 2, central tube 5, last guider ring 3, rubber tube 4, adapter ring 6, rubber tube 7, following guider ring 8, spline housing joint 9, spline housing 10, shear pin 11, splined shaft 12 is formed, the upper end of described top connection 2 is provided with drilling rod syndeton 1 (being connecting interface herein), the lower end of described top connection 2 is connected with the upper end of central tube 5, the lower end of described central tube 5 is connected with the upper end of splined shaft 12, described central tube 5 is provided with discharge orifice 28, the described guider ring 3 of going up, rubber tube 4, adapter ring 6, rubber tube 7, following guider ring 8, spline housing joint 9 is sleeved on the central tube 5, described rubber tube 4,7 inboard is provided with indent ball cambered surface 27, the lower end of described spline housing joint 9 is connected with the upper end of spline housing 10, described spline housing joint 9 is provided with earial drainage duct 29, described spline housing 10 is connected by the spline syndeton that cooperatively interacts with splined shaft 12 and is located by shear pin 11, described spline housing 10 is provided with six key internal splines, and described splined shaft 12 is provided with the triple bond external splines.
Current by pass described in the present embodiment is made up of discharge orifice 28, earial drainage duct 29, earial drainage road 30, described discharge orifice 28 is arranged on the central tube 5 of hollow, described earial drainage duct 29 is arranged on the spline housing joint 9, and splined shaft 12 fit clearances of the spline housing 10 of described six key internal splines and triple bond external splines form earial drainage road 30.
Pressure relief means thereon described in the present embodiment is by piston 13, spring 14, outer tube 15, piston cap 16, non-return blind nut 17, check spring 18, non-return pin 19, hang pin 20, packoff nipple 21, interior pipe 22, end cover 24, lower contact 25 is formed, described piston 13 and spring 14 are sleeved in the cavity of resorption of splined shaft 12, the upper end of described outer tube 15 is connected with the lower end of spline housing 10, the lower end of described outer tube 15 is connected with the upper end of lower contact 25, described outer tube 15 is provided with through hole 33 in a certain suitable position, the lower end of described lower contact 25 is provided with support bar syndeton 26 (being connecting interface herein), the upper end of described piston cap 16 is connected with the lower end of splined shaft 12, the lower end of described piston cap 16 is connected with the upper end of interior pipe 22, pipe 22 is provided with through hole 32 in a certain suitable position in described, described non-return blind nut 17, check spring 18 and non-return pin 19 are installed in the radial hole of piston cap 16, the lower end of described piston 13 is connected with packoff nipple 21 by hanging pin 20, described packoff nipple 21 is provided with through hole 31 in a certain suitable position, in the inner chamber of pipe 22, the lower end of described interior pipe 22 was connected with end cover 24 in described packoff nipple 21 was installed in.
Pressure gauge described in the present embodiment 23 is connected on the end cover 24, be installed in the cavity of packoff nipple 21, interior pipe 22 and end cover 24 compositions, described pressure gauge 23 is the electronic type pressure bomb, and the electronic type pressure bomb adopts the electronic pressure gauge that Hubei Jianghan Petroleum Instrument Co., Ltd produces in the present embodiment.
During boring coal-bed gas pressure measuring instrument in using this present embodiment, allow the upper end 1 of top connection 2 and the lower end of drill string be connected, allow the lower end 26 of lower contact 25 and the support bar of certain-length be connected, the length of support bar determines that according to the position in coal seam and the requirement of sealing of hole the lower end of support bar is connected with drill bit.
When under the boring coal-bed gas pressure measuring instrument of present embodiment, boring, mud in the hole or clear water pass through the hollow of drill bit, support bar and lower contact 25 successively, the earial drainage road 30 of annulus, spline housing 10 and the splined shaft 12 of interior pipe 22 and outer tube 15, the earial drainage duct 29 of spline housing joint 9, the discharge orifice 28 of central tube 5, enter in the inner chamber of central tube 5, top connection 2, drill string, from the drilling rod of aperture, return out, reach the back pressure of eliminating drilling tool, prevent cutting off in advance of pin 11, make the boring coal-bed gas pressure measuring instrument arrive appointed positions smoothly.
Under the boring coal-bed gas pressure measuring instrument of present embodiment, bore when being hampered in the way, with rig abrasion drill roofbolt, moment of torsion successively by top connection 2, central tube 5, splined shaft 12, spline housing 10, outer tube 15, lower contact 25, support bar, pass to drill bit, expand and sweep the hole section that is hampered, until being lowered to smoothly, reach the purpose of not carrying brill midway, reduce the non-cutting time of measuring pressure, improve the efficient of measuring pressure.
At (drill bit that this moment, the support bar lower end connected prop up the hole at the bottom of) under the boring coal-bed gas pressure measuring instrument of present embodiment during to assigned address, the kelly of drill string and rig is connected, with the weight of drill string or the oil cylinder pressurization of rig, pressure passes through drill string successively, top connection 2, central tube 5, pass to splined shaft 12, cut off shear pin 11, after this pressure passes through drill string successively, top connection 2, last guider ring 3, rubber tube 4, adapter ring 6, rubber tube 7, pass to down guider ring 8, the spline housing joint 9 of following guider ring 8 bottoms, spline housing 10, outer tube 15, lower contact 25, support bar and drill bit prop up at the bottom of the hole, under the effect of pressure, force rubber tube 4,7 axial compression, expanded radially, be close to hole wall, the top and the bottom packing of will holing is come; Drill string, top connection 2, central tube 5, splined shaft 12, piston cap 16 (containing piston 13, spring 14, non-return blind nut 17, check spring 18, non-return pin 19), interior pipe 22 (contain and hang pin 20, packoff nipple 21), end cover 24 (containing pressure gauge 23) move down successively in the rubber tube axial compression, the discharge orifice 28 of central tube 5 is by the sealing of the inwall of spline housing joint 9, and the through hole 32 of interior pipe 22 and the through hole 33 of outer tube 15 align substantially.At this moment send into pressure mud or clear water by the hollow part of drill string, pressure mud or clear water enter the inside of splined shaft 12 by the cavity of top connection 2, central tube 5, compression piston 13 promotes packoff nipple 21 and moves down, and makes through hole 31 and 32 alignment of the through hole on the interior pipe 22 on the packoff nipple 21; At this moment, non-return pin 19 stretches out seized piston 13 under the elastic force effect of check spring 18, prevents piston 13 return under the effect of spring 14; At this moment outer tube 15 outer pressure-bearing mud flow into and are equipped with in the manometric interior pipe 22, and internal and external pressure balance is finished release; Coal-bed gas also enters in the interior pipe 22 by the through hole 33,32,31 of alignment, is noted pressure data by electronic type pressure bomb 23, reaches the purpose of pressure measurement.
After the boring coal-bed gas pressure measuring instrument of present embodiment is finished determination of coal seam gas pressure, carry drilling tool on the releasing axial compression is also suitable, rubber tube 4,7 restores to the original state rapidly, top connection 2, central tube 5, splined shaft 12, piston cap 16 (containing piston 13, spring 14, non-return blind nut 17, check spring 18, non-return pin 19), interior pipe 22 (contain and hang pin 20, packoff nipple 21), end cover 24 (containing pressure gauge 23) move on successively, and the discharge orifice 28 of central tube 5 and the earial drainage duct of spline housing joint 9 29 are communicated with; Carry brill this moment, the inner chamber that mud in the drilling rod or clear water pass through drill string, top connection 2, central tube 5 successively, the discharge orifice 28 of central tube 5, the earial drainage duct 29 of spline housing joint 9, the earial drainage road 30 of spline housing 10 and splined shaft 12, the annulus of interior pipe 22 and outer tube 15, enter in the hollow of lower contact 25, support bar and drill bit, add in the boring, reach the swabbing action of eliminating drilling tool, reduce destruction borehole wall.

Claims (3)

1, a kind of geological prospecting borehole coal-bed gas pressure measuring instrument, has the analyzer columnar shape basal, it is characterized in that described analyzer columnar shape basal is by packing torsion pass mechanism, current by pass, pressure relief means thereon and pressure gauge are formed, described packing torsion pass mechanism is by top connection, central tube, last guider ring, rubber tube, adapter ring, following guider ring, the spline housing joint, spline housing, shear pin and splined shaft are formed, the upper end of described top connection is provided with the drilling rod syndeton, the lower end of described top connection is connected with the upper end of central tube, the lower end of described central tube is connected with the upper end of splined shaft, the described guider ring of going up, rubber tube, adapter ring, following guider ring and spline housing fitting sleeve are contained on the central tube, the lower end of described spline housing joint is connected with the upper end of spline housing, described spline housing is connected by the spline syndeton that cooperatively interacts with splined shaft and is located by shear pin, described spline housing is provided with six key internal splines, and described splined shaft is provided with the triple bond external splines; Described current by pass is made up of discharge orifice, earial drainage duct and earial drainage road, described discharge orifice is arranged on the central tube of hollow, described earial drainage duct is arranged on the spline housing joint, and the splined shaft fit clearance of the spline housing of described six key internal splines and triple bond external splines forms the earial drainage road; Described pressure relief means thereon is by piston, spring, outer tube, piston cap, the non-return blind nut, check spring, the non-return pin, hang pin, packoff nipple, interior pipe, end cover and lower contact are formed, described piston and spring housing are contained in the cavity of resorption of splined shaft, the upper end of described outer tube is connected with the lower end of spline housing, the lower end of described outer tube is connected with the upper end of lower contact, described outer tube is provided with outer pipe through-hole, the lower end of described lower contact is provided with the support bar syndeton, the upper end of described piston cap is connected with the lower end of splined shaft, the lower end of described piston cap is connected with the upper end of interior pipe, pipe is provided with interior pipe through-hole in described, described non-return blind nut, check spring and non-return pin are installed in the radial hole of piston cap, the lower end of described piston is connected with packoff nipple by hanging pin, described packoff nipple is provided with the packoff nipple through hole, in the inner chamber of pipe, the lower end of described interior pipe was connected with end cover in described packoff nipple was installed in; Described pressure gauge is connected on the end cover, and is installed in the common cavity of forming of packoff nipple, interior pipe and end cover.
2, geological prospecting borehole coal-bed gas pressure measuring instrument according to claim 1 is characterized in that described rubber tube is inboard rubber tube with indent spheroidal cambered surface.
3, geological prospecting borehole coal-bed gas pressure measuring instrument according to claim 1 and 2 is characterized in that described pressure counts the electronic type pressure bomb.
CNU2008200646733U 2008-08-12 2008-08-12 Geological exploration drill coal-bed gas pressure determinator Expired - Fee Related CN201241696Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CNU2008200646733U CN201241696Y (en) 2008-08-12 2008-08-12 Geological exploration drill coal-bed gas pressure determinator

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104316347A (en) * 2014-10-24 2015-01-28 沈阳宇安科技有限公司 Locating pin type coal seam gas content measurement sampling device and method
CN108693069A (en) * 2018-08-13 2018-10-23 中煤科工集团重庆研究院有限公司 Ickings desorption of mash gas characteristic parameter drill with brill measurement device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104316347A (en) * 2014-10-24 2015-01-28 沈阳宇安科技有限公司 Locating pin type coal seam gas content measurement sampling device and method
CN108693069A (en) * 2018-08-13 2018-10-23 中煤科工集团重庆研究院有限公司 Ickings desorption of mash gas characteristic parameter drill with brill measurement device
CN108693069B (en) * 2018-08-13 2021-01-01 中煤科工集团重庆研究院有限公司 Drilling coal dust gas desorption characteristic parameter measurement while drilling device

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Granted publication date: 20090520

Termination date: 20140812

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