CN102767363B - Electric communication drill rod and method for increasing transmission distance of electromagnetic wave measurement while drilling signal - Google Patents
Electric communication drill rod and method for increasing transmission distance of electromagnetic wave measurement while drilling signal Download PDFInfo
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- CN102767363B CN102767363B CN201210245813.8A CN201210245813A CN102767363B CN 102767363 B CN102767363 B CN 102767363B CN 201210245813 A CN201210245813 A CN 201210245813A CN 102767363 B CN102767363 B CN 102767363B
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Abstract
The invention relates to an electric communication drill rod and a method for increasing a transmission distance of an electromagnetic wave measurement while drilling signal. The electric communication drill rod is formed by spraying electric insulation layers on the inner surface and the outer surface of the common drill rod; the electric insulation layers are anti-abrasion rubber layers or formed by spraying a mixture of hard rubber and diamond; the volume ratio of the diamond particles to the hard rubber is 1: 5-1: 2; and the thickness of the diamond particles is 40 to 150 meshes; the shearing strength of the hard rubber is not less than 24 MPa. Equipment used in the method comprises a drill column unit, an underwell measurement and emission unit and a signal receiving unit. According to the method, the electric communication drill rod partially or totally replaces the common drill rod during electromagnetic wave measurement while drilling; by the electric communication drill rod, loss generated by partial eddy current beside an insulation short node is reduced, and an electromagnetic field can be fully dispersed in the space; and therefore, signal voltage fed back to the ground is increased, and the signal transmission distance is increased. The electric communication drill rod is simple in structure; and the using effect of the method is obvious.
Description
Technical field
The present invention relates to a kind of method making electricity consumption communication drilling rod improve electromagnetic measurement while drilling signal transmission distance, particularly relate to the drilling rod that a kind of surfaces externally and internally is coated with electrically insulating material, two ends of drill can conducting, upper drilling string in electromagnetic measurement while drilling, adopt electric communication segment of drillpipe to replace or all replace common drilling rod, electricity communication drilling rod is arranged on the upper end of insulating short section, insulate with stratum, reduce the loss that near insulating short section, local eddy currents produces, and then effectively improve the method for electromagnetic measurement while drilling signal transmission distance.
Background technology
Electromagnetic measurement while drilling (EM-MWD) is the new technology entering industrial applications the eighties in 20th century, affects little, not only may be used for mud drilling, and may be used for foam, air drilling by mud medium.In practical logging process, because electromagnetic wave will transmit through stratum, the impact by formation resistivity is very large, especially formation resistivity at 0 ~ 10 Ω m time, on the reception impact of ground signal greatly.Under normal circumstances, formation resistivity is less, and the decay of signal is more serious, when reaching certain depth, will be difficult to effective electromagnetic wave signal be detected on ground.Trace it to its cause, length mainly due to insulating short section is usually shorter, in the face of large section low resistance stratum, they are most or all will be placed in low resistivity formations, under the effect of exciting current, launch the close together at the two poles of the earth, the local eddy currents that easy formation is larger, make the voltage feeding back to ground minimum, be difficult to the reception realizing signal, be unfavorable for carrying out electromagnetic measurement while drilling operation at comparatively deep-well intraocular.
Summary of the invention
The object of the invention is to solve prior art existing problems, a kind of surfaces externally and internally is provided to be coated with the electric communication drilling rod of electrically insulating material, two ends conducting, and provide a kind of and be used in electromagnetic measurement while drilling by described electric communication drilling rod, thus effectively improve the method for signal transmission distance.
To achieve these goals, the present invention adopts following technical scheme to realize, there is provided a kind of method making electricity consumption communication drilling rod improve electromagnetic measurement while drilling signal transmission distance, the equipment used in method comprises drill string unit, underground survey transmitter unit and signal receiving unit; It is characterized in that: operating procedure is as follows:
(1), drill string unit is arranged in the borehole wall with the form of pipe string combination, is up connected with lower drilling string, non-magnetic drilling tool, hanging pup joint, insulating short section and upper drilling string in turn from drill bit; Described upper drilling string contains the electric communication drilling rod and common drilling rod that are coated with electric insulation layer from lower to upper, and the length that electric communication drilling rod connects is 9 ~ 3000m, or all adopts electric communication drilling rod to substitute common drilling rod; Described electric communication drilling rod includes drilling rod body and coating, and described drilling rod body is common drilling rod; Described coating is electric insulation layer, be divided into electric insulation layer in the outer electric insulation layer of drilling rod and drilling rod, spraying electric insulation layer position is the inside and outside surface of drilling rod except screw thread and end face, and described electric insulation layer is that wear-resisting glue or sprayed by ebonite and diamond mixed material forms;
(2), by underground survey transmitter unit be arranged in non-magnetic drilling tool, hanging pup joint and insulating short section, in company with drill string unit G.I.H together; Underground survey transmitter unit is split type combination or monolithic combination; Wherein
A, described split type combination up include successively the end of from and measure power supply pipe nipple, measurement pipe nipple, emission power pipe nipple, launch pipe nipple and lead assemblies, and described measurement power supply pipe nipple and emission power pipe nipple are respectively to measure pipe nipple and launch pipe nipple provides energy source and power; Launch pipe nipple one pole to be connected with hanging pup joint by shoulder card, another pole is connected with lead terminal fixed tray by armored cable via lead-in wire top assembly;
B, described monolithic combination up include power supply pipe nipple successively, measure and launch pipe nipple and lead assemblies the end of from, described measurement is launched in pipe nipple and is mounted to integrally-built measuring element and ballistic device, and power supply pipe nipple connects to measure to be launched pipe nipple and provides energy source and power for the measuring element in it and ballistic device; The pole measuring the driving source of the ballistic device launching pipe nipple is connected with hanging pup joint by shoulder card, and another pole is connected with lead terminal fixed tray via lead-in wire top assembly by armored cable; Be threaded connection between each adjacent component in two kinds of combinations; Described measurement power supply pipe nipple, measurement pipe nipple, emission power pipe nipple and power supply pipe nipple are fixed by screws in non-magnetic drilling tool; Described transmitting pipe nipple and measurement are launched pipe nipple and are placed on hanging pup joint; Described lead assemblies is made up of go between top assembly and lead terminal fixed tray, lead-in wire top assembly is by armored cable connecting lead wire end fixed tray, lead terminal fixed tray is fixed in upper drilling string on electric communication drilling rod, and described electric communication drilling rod and the bearing of lead terminal fixed tray do not spray electric insulation layer;
(3), on the ground of derrick install signal receiving unit, described signal receiving unit is made up of the receiving system and earthing electrode being located at ground, and receiving system one pole is connected with derrick, and another pole is connected with earthing electrode, and earthing electrode inserts ground deeply;
(4), during electromagnetic measurement while drilling system works, the driving source that the ballistic device of pipe nipple is launched in down-hole transmitting pipe nipple or measurement is intercept with insulating short section, in transmitting pipe nipple or measurement transmitting pipe nipple, armored cable, upper drilling string, stratum and hanging pup joint, form current loop; Down-hole information is transmitted in the form of an electromagnetic wave in the magnetic field produced around current loop, receiving system in signal receiving unit receives electromagnetic wave signal by the potential difference measured between earthing electrode and derrick, and measures the information of gained by receiving system process and display shaft bottom.
Step of the present invention (1) described in wear-resisting glue select the wear-resisting glue of BD706.
Step of the present invention (1) described in ebonite and diamond mixed material the volume ratio of diamond particles and ebonite be 1:5 ~ 1:2, the thickness of diamond particles is 40 ~ 150 orders, and described ebonite shear strength is not less than 24MPa.
Step of the present invention (1) described in ebonite select happy safe 380, happy safe 415, happy safe 480, happy safe 4210 or happy safe 4212.
Drilling rod uses the etch-proof spray painting anticorrosive coat of Wear-resistant, high-temperature resistant before making the present invention, and object is to protect drilling rod.The present invention proposes first at the inside and outside surface spraying electric insulation layer of common drilling rod body, and object is to effectively improve signal transmission distance in electromagnetic measurement while drilling.Due to similar on common drilling rod and drill collar structure, only distinguish to some extent in pipe thickness, the common drilling rod of wall ratio of drill collar wants large, thus, said method can be adopted equally to process drill collar.
Electric communication drilling rod of the present invention goes for other forms of electromagnetic measurement while drilling equally, the drilling rod on by insulating short section is only needed to substitute or the common drilling rod of replacing whole with electric communication segment of drillpipe, the distance of launching the two poles of the earth is increased by making electricity consumption communication drilling rod, avoid the appearance of local eddy currents phenomenon, be conducive to dispersion and the transmission of electromagnetic wave signal, the signal voltage feeding back to ground is increased, thus effectively improves electromagnetic measurement while drilling signal transmission distance.
Technology of the present invention compared with prior art has following beneficial effect:
1, electric communication jackrod structure of the present invention is simple, and at drilling rod inside and outside wall spraying electric insulation layer, technology maturation, is easy to realize suitability for industrialized production.
2, electric communication drilling rod of the present invention is applied in electromagnetic measurement while drilling, is arranged on the upper end of insulating short section, insulate with stratum, reduces the loss that near insulating short section, local eddy currents produces, and effectively improves the transmission range of electromagnetic measurement while drilling signal.Also make power supply energy be fully utilized simultaneously, extend the time that electromagnetic measurement while drilling instrument uses in down-hole.
Accompanying drawing explanation
Fig. 1 is the generalized section of the present invention's electricity communication drilling rod.
Fig. 2 is the split type measurement transmitter unit structural representation used in method of the present invention.
Fig. 3 is that the monolithic used in method of the present invention measures transmitter unit structural representation.
In above-mentioned figure: 1-drilling rod box end; 2-drilling rod body; The outer electric insulation layer of 3a-; Electric insulation layer in 3b-; 4-drilling rod pin end; 5-derrick; 6-cable; 7-receiving system; 8-earthing electrode; 9-insulating short section; 10-hanging pup joint; 11-screw; 12-non-magnetic drilling tool; 13-lower drilling string; 14-drill bit; 15-measures power supply pipe nipple; 16-measures pipe nipple; 17-emission power pipe nipple; 18-launches pipe nipple; 19-lead-in wire top assembly; 20-armored cable; 21-lead terminal fixed tray; 22-electricity communication drilling rod; The common drilling rod of 23-; 24-power supply pipe nipple; 25-measures and launches pipe nipple.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1: before detailed description method of the present invention, the one electricity communication drilling rod that the present invention uses first is described, its structure as shown in Figure 1, include drilling rod body 2 and coating, described drilling rod body 2 is common drilling rod, drilling rod body two ends are respectively drilling rod pin end 4 and drilling rod box end 1, and pin end and box end are provided with screw thread, so that drilling rod joins end to end; Described coating is electric insulation layer, be divided into electric insulation layer 3b in the outer electric insulation layer 3a of drilling rod and drilling rod, spraying electric insulation layer position is the inside and outside surface of drilling rod except screw thread and end face, described electric insulation layer is that ebonite and diamond mixed material spray and form, the volume ratio that wherein diamond particles mixes with ebonite is 1:5, the thickness of diamond particles is 40 orders, and the shear strength of described ebonite is not less than 24MPa, and ebonite selects happy safe 380.
Embodiment 2: the one electricity communication drilling rod that the present invention uses, its structure is as embodiment 1, and the volume ratio mixed with ebonite unlike diamond particles in described electric insulation layer spray paint is 1:2, and the thickness of diamond particles is 150 orders, and ebonite selects happy safe 4210.
Embodiment 3: the electric communication drilling rod using the embodiment of the present invention 1 to provide improves the method for electromagnetic measurement while drilling signal transmission distance, and the equipment used in method comprises drill string unit, underground survey transmitter unit and signal receiving unit; Its operating procedure is as follows, see Fig. 2;
(1), drill string unit is arranged in the borehole wall with the form of pipe string combination, is up connected with lower drilling string 13, non-magnetic drilling tool 12, hanging pup joint 10, insulating short section 9 and upper drilling string in turn from the drill bit 14 in shaft bottom; Described upper drilling string is from lower to upper containing the electric communication drilling rod 22 and the common drilling rod 23 that are coated with electric insulation layer, and according to creeping into actual grade and the setting of signal power, to install the length of electric communication drilling rod be 9m;
(2), by underground survey transmitter unit be arranged in non-magnetic drilling tool 12, hanging pup joint 10 and insulating short section 9, in company with drill string unit G.I.H together; Underground survey transmitter unit adopts split type combination; Described split type underground survey transmitter unit, up includes successively the end of from and measures power supply pipe nipple 15, measurement pipe nipple 16, emission power pipe nipple 17, launches pipe nipple 18 and lead assemblies, be threaded connection between each adjacent component; Described lead assemblies is made up of go between top assembly 19 and lead terminal fixed tray 21; Described measurement power supply pipe nipple 15 and emission power pipe nipple 17 are respectively to measure pipe nipple 16 and launch pipe nipple 18 provides energy source and power; Launch ballistic device one pole in pipe nipple 18 to be connected with hanging pup joint 10 by shoulder card, another pole is connected with lead terminal fixed tray 21 by armored cable 20 via lead-in wire top assembly 19; Described measurement power supply pipe nipple 15, measurement pipe nipple 16, emission power pipe nipple 17 and transmitting pipe nipple 18 are fixed in non-magnetic drilling tool 12 by screw 11; Described lead terminal fixed tray 21 is fixed on the electric communication drilling rod in upper drilling string, and described electric communication drilling rod and the bearing of lead terminal fixed tray 21 do not spray electric insulation layer;
(3), on the ground of derrick install signal receiving unit, signal receiving unit is provided with ground receiving wastewater facility 7 and earthing electrode 8, and receiving system one pole is connected with derrick 5 by cable 6, and another pole is connected with earthing electrode 8, and earthing electrode inserts ground deeply;
, electromagnetic measurement while drilling system works time, the driving source that the ballistic device of pipe nipple 18 is launched in down-hole for intercepting, forms current loop with insulating short section 9 in transmitting pipe nipple 18, armored cable 20, upper drilling string, stratum and hanging pup joint 10; Down-hole information is transmitted in the form of an electromagnetic wave in the magnetic field produced around current loop, receiving system 7 in signal receiving unit receives electromagnetic wave signal by the potential difference measured between earthing electrode 8 and derrick 5, and is processed and the information showing shaft bottom and measure gained by receiving system 7.
Embodiment 4: the electric communication drilling rod using the embodiment of the present invention 2 to provide improves the method for electromagnetic measurement while drilling signal transmission distance, and the equipment used in method comprises drill string unit, underground survey transmitter unit and signal receiving unit; Its operating procedure is as follows: see Fig. 3;
(1), drill string unit is arranged in the borehole wall with the form of pipe string combination, is up connected with lower drilling string 13, non-magnetic drilling tool 12, hanging pup joint 10, insulating short section 9 and upper drilling string in turn from drill bit 14; Upper drilling string contains the electric communication drilling rod 22 and common drilling rod 23 that are coated with electric insulation layer from lower to upper, and the length of electric communication drilling rod is set as 3000m according to actual conditions;
(2), by underground survey transmitter unit be arranged in non-magnetic drilling tool 12, hanging pup joint 10 and insulating short section 9, in company with drill string unit G.I.H together; Adopt the underground survey transmitter unit of monolithic combination; The underground survey transmitter unit of monolithic combination up has power supply pipe nipple 24 successively, measures and launch pipe nipple 25 and lead assemblies the end of from, be threaded connection between each adjacent component; Described lead assemblies is made up of go between top assembly 19 and lead terminal fixed tray 21; Described measurement is launched in pipe nipple 25 and is mounted to integrally-built measuring element and ballistic device, and power supply pipe nipple 24 connects to measure to be launched pipe nipple 25 and provides energy source and power for the measuring element in it and ballistic device; The pole measuring the driving source of the ballistic device launching pipe nipple 25 is connected with hanging pup joint 10 by shoulder card, and another pole is connected with lead terminal fixed tray 21 via lead-in wire top assembly 19 by armored cable 20; Pipe nipple 25 is launched in described measurement and power supply pipe nipple 24 is fixed in non-magnetic drilling tool 12 by screw 11; Lead terminal fixed tray 21 is fixed on the electric communication drilling rod in upper drilling string with the form of screw thread, described electric communication drilling rod and the bearing of lead terminal fixed tray 21 do not spray electric insulation layer;
(3), on the ground of derrick 5 install signal receiving device 7, receiving system one pole is connected with derrick 5, and another pole is connected with the earthing electrode 8 deeply inserting ground;
, electromagnetic measurement while drilling system works time, the driving source measuring the ballistic device launching pipe nipple 25 equally with insulating short section 9 for intercepting, launch in pipe nipple 25, armored cable 20, upper drilling string, stratum and hanging pup joint 10 in measurement and form current loop; Down-hole information is transmitted in the form of an electromagnetic wave in the magnetic field produced around current loop, and receiving system 7 receives electromagnetic wave signal by the potential difference measured between earthing electrode 8 and derrick 5, and measures the information of gained by receiving system process and display shaft bottom.
Reduce the appearance of local eddy currents phenomenon near insulating short section owing to having installed electric communication drilling rod 22, be conducive to dispersion and the transmission of electromagnetic wave signal, the voltage feeding back to ground is increased, improves the distance of electromagnetic measurement while drilling Signal transmissions.
Embodiment 5: in the present invention electric communication drilling rod and described method substantially the same manner as Example 4.Happy safe 4212 are selected unlike using ebonite in electric communication drilling rod coating; Electricity consumption communication drilling rod is all made in upper drilling string.
Embodiment 6: in the present invention electric communication drilling rod and described method substantially the same manner as Example 5.Be the wear-resisting glue of BD706 unlike the wear-resisting glue used in electric communication drilling rod electric insulation layer.
Electric communication drilling rod of the present invention is applied in electromagnetic measurement while drilling, electricity communication drilling rod is arranged on the upper end of insulating short section, insulate with stratum, reduce the loss that near insulating short section, local eddy currents produces, effectively can improve the transmission range of electromagnetic measurement while drilling signal.
Claims (4)
1. make electricity consumption communication drilling rod improve a method for electromagnetic measurement while drilling signal transmission distance, the equipment used in method comprises drill string unit, underground survey transmitter unit and signal receiving unit; It is characterized in that: operating procedure is as follows:
(1), drill string unit is arranged in the borehole wall with the form of pipe string combination, is up connected with lower drilling string, non-magnetic drilling tool, hanging pup joint, insulating short section and upper drilling string in turn from drill bit; Described upper drilling string contains the electric communication drilling rod and common drilling rod that are coated with electric insulation layer from lower to upper, and the length that electric communication drilling rod connects is 9 ~ 3000m, or all adopts electric communication drilling rod to substitute common drilling rod; Described electric communication drilling rod, includes drilling rod body and coating, and described drilling rod body is common drilling rod; Described coating is electric insulation layer, be divided into electric insulation layer in the outer electric insulation layer of drilling rod and drilling rod, spraying electric insulation layer part is the inside and outside surface of drilling rod except screw thread and end face, and described electric insulation layer is that wear-resisting glue or sprayed by ebonite and diamond mixed material forms;
(2), by underground survey transmitter unit be arranged in non-magnetic drilling tool, hanging pup joint and insulating short section, in company with drill string unit G.I.H together; Underground survey transmitter unit is split type combination or monolithic combination; Wherein
A, described split type combination up include successively the end of from and measure power supply pipe nipple, measurement pipe nipple, emission power pipe nipple, launch pipe nipple and lead assemblies, and described measurement power supply pipe nipple and emission power pipe nipple are respectively to measure pipe nipple and launch pipe nipple provides energy source and power; Launch pipe nipple one pole to be connected with hanging pup joint by shoulder card, another pole is connected with lead terminal fixed tray by armored cable via lead-in wire top assembly;
B, described monolithic combination up include power supply pipe nipple successively, measure and launch pipe nipple and lead assemblies the end of from, described measurement is launched in pipe nipple and is mounted to integrally-built measuring element and ballistic device, and power supply pipe nipple connects to measure to be launched pipe nipple and provides energy source and power for the measuring element in it and ballistic device; The pole measuring the driving source of the ballistic device launching pipe nipple is connected with hanging pup joint by shoulder card, and another pole is connected with lead terminal fixed tray via lead-in wire top assembly by armored cable; Be threaded connection between each adjacent component in two kinds of combinations; Described measurement power supply pipe nipple, measurement pipe nipple, emission power pipe nipple and power supply pipe nipple are fixed by screws in non-magnetic drilling tool; Described transmitting pipe nipple and measurement are launched pipe nipple and are placed on hanging pup joint; Described lead assemblies is made up of go between top assembly and lead terminal fixed tray, lead-in wire top assembly is by armored cable connecting lead wire end fixed tray, lead terminal fixed tray is fixed in upper drilling string on electric communication drilling rod, and described electric communication drilling rod and the bearing of lead terminal fixed tray do not spray electric insulation layer;
(3), on the ground of derrick install signal receiving unit, described signal receiving unit is made up of the receiving system and earthing electrode being located at ground, and receiving system one pole is connected with derrick, and another pole is connected with earthing electrode, and earthing electrode inserts ground deeply;
(4), during electromagnetic measurement while drilling system works, the driving source that the ballistic device of pipe nipple is launched in down-hole transmitting pipe nipple or measurement is intercept with insulating short section, in transmitting pipe nipple or measurement transmitting pipe nipple, armored cable, upper drilling string, stratum and hanging pup joint, form current loop; Down-hole information is transmitted in the form of an electromagnetic wave in the magnetic field produced around current loop, receiving system in signal receiving unit receives electromagnetic wave signal by the potential difference measured between earthing electrode and derrick, and measures the information of gained by receiving system process and display shaft bottom.
2. the method making electricity consumption communication drilling rod improve electromagnetic measurement while drilling signal transmission distance according to claim 1, is characterized in that: the wear-resisting glue of BD706 selected by the wear-resisting glue described in step (1).
3. the method making electricity consumption communication drilling rod improve electromagnetic measurement while drilling signal transmission distance according to claim 1, it is characterized in that: in the ebonite described in step (1) and diamond mixed material, the volume ratio of diamond particles and ebonite is 1:5 ~ 1:2, the thickness of diamond particles is 40 ~ 150 orders, and described ebonite shear strength is not less than 24MPa.
4. the method making electricity consumption communication drilling rod improve electromagnetic measurement while drilling signal transmission distance according to claim 1, is characterized in that: in the electric insulation layer described in step (1), ebonite selects happy safe 380, happy safe 415, happy safe 480, happy safe 4210 or happy safe 4212.
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| CN201210245813.8A CN102767363B (en) | 2012-07-11 | 2012-07-11 | Electric communication drill rod and method for increasing transmission distance of electromagnetic wave measurement while drilling signal |
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| CN201210245813.8A CN102767363B (en) | 2012-07-11 | 2012-07-11 | Electric communication drill rod and method for increasing transmission distance of electromagnetic wave measurement while drilling signal |
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| CN102767363B true CN102767363B (en) | 2015-03-04 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105583240B (en) * | 2014-11-14 | 2018-08-14 | 南京高精工程设备有限公司 | A kind of manufacturing method extending guide plate service life |
| CN106837201B (en) * | 2017-03-22 | 2018-09-28 | 中国石油天然气集团公司 | A kind of split type drill collar and logging method |
| CN106884619B (en) * | 2017-03-22 | 2020-01-31 | 中国石油天然气集团公司 | wear-resistant measurement-while-drilling drill collar and measurement method |
| CN108071351B (en) * | 2017-12-08 | 2019-07-09 | 华中科技大学 | A kind of electrodrill joint structure |
| CN108756863A (en) * | 2018-04-18 | 2018-11-06 | 中国地质大学（武汉） | A method of improving electromagnetic measurement while drilling signal transmission distance using becket |
| CN108612523B (en) * | 2018-05-16 | 2019-06-28 | 中国地质大学（武汉） | A kind of bi-directional electromagnetic measurement while drilling control method and system based on aerial array |
| CN109057780B (en) * | 2018-07-12 | 2024-04-05 | 东营市创元石油机械制造有限公司 | Electromagnetic wave measurement while drilling system with wired communication in petroleum drilling |
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| CA2496170C (en) * | 2005-02-08 | 2008-12-30 | David Cramer | Gap sub assembly |
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| US6763887B2 (en) * | 2002-10-23 | 2004-07-20 | Varco I/P, Inc. | Drill pipe having an internally coated electrical pathway |
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| WO2009143409A2 (en) * | 2008-05-23 | 2009-11-26 | Martin Scientific, Llc | Reliable downhole data transmission system |
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| CA2496170C (en) * | 2005-02-08 | 2008-12-30 | David Cramer | Gap sub assembly |
| CN102305029A (en) * | 2011-08-12 | 2012-01-04 | 中国地质大学（武汉） | Insulating pup joint used for underground mine drilling and manufacture method thereof |
| CN102536204A (en) * | 2012-01-11 | 2012-07-04 | 中国地质大学（武汉） | Method for increasing transmitting efficiency of electromagnetic wave wireless measurement-while-drilling system by aid of multiple insulation short pieces |
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