CN102767363A - 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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- CN102767363A CN102767363A CN2012102458138A CN201210245813A CN102767363A CN 102767363 A CN102767363 A CN 102767363A CN 2012102458138 A CN2012102458138 A CN 2012102458138A CN 201210245813 A CN201210245813 A CN 201210245813A CN 102767363 A CN102767363 A CN 102767363A
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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 the method for a kind of electric communication drilling rod and raising electromagnetic wave while-drilling measuring-signal transmission range; Relate in particular to a kind of surfaces externally and internally and be coated with the drilling rod of electrically insulating material; But the two ends of drill conducting, the upper drilling string in electromagnetic wave while-drilling is measured adopts electric communication drilling rod partly to replace or all replace common drilling rod; Electricity communication drilling rod is installed in the upper end of insulating short section; With the stratum insulation, reduce the loss that near the local eddy currents of insulating short section produces, and then effectively improve the method for electromagnetic wave while-drilling measuring-signal transmission range.
Background technology
Electromagnetic measurement while drilling (EM-MWD) is a new technology that gets into industrial applications the eighties in 20th century, and it is little influenced by mud medium, not only can be used for DWM, and can be used for foam, air drilling.In actual well logging process, because electromagnetic wave will transmit through the stratum, receive the influence of formation resistivity very big, especially in formation resistivity during, greatly to the reception influence of ground signal at 0～10 Ω m.Generally, formation resistivity is more little, and the decay of signal is just serious more, when reaching certain depth, will be difficult to detect effective electromagnetic wave signal on ground.Tracing it to its cause, mainly is because the length of insulating short section is shorter usually, in the face of big section low resistance stratum; Its overwhelming majority perhaps all will place the low-resistivity stratum, under the effect of exciting current, and the close together at emission the two poles of the earth; The local eddy currents that easy formation is bigger; Make that the voltage that feeds back to ground is minimum, be difficult to realize the reception of signal, be unfavorable for carrying out electromagnetic wave while-drilling measurement operation than the deep-well intraocular.
Summary of the invention
The objective of the invention is in order to solve the prior art existing problems; Provide a kind of surfaces externally and internally to be coated with the electric communication drilling rod of electrically insulating material, two ends conducting; And provide a kind of and described electric communication drilling rod is used for electromagnetic wave while-drilling measures, thereby effectively improve the method for signal transmission distance.
To achieve these goals; The present invention adopts following technical scheme to realize, a kind of electric communication drilling rod is provided, and includes drilling rod body and coating; Described drilling rod body is common drilling rod; Drilling rod body two ends are respectively pin end and box end, and pin end and box end are provided with screw thread, so that drilling rod joins end to end; Described coating is an electric insulation layer; Be divided into electric insulation layer in outer electric insulation layer of drilling rod and the drilling rod; Spraying electric insulation layer position is the inside and outside surface of drilling rod except that screw thread and end face, and described electric insulation layer is that wear-resisting glue or sprayed by ebonite and diamond mixed material forms.
Wear-resisting glue of the present invention is selected the wear-resisting glue of BD706 for use.
The volume ratio of diamond particles and ebonite is 1:5～1:2 in ebonite according to the invention and the diamond mixed material, and the thickness of diamond particles is 40～150 orders, and described ebonite shear strength is not less than 24MPa.
Ebonite of the present invention selects happy safe 380, happy safe 415, happy safe 480, happy safe 4210 or happy safe 4212 for use.
Drilling rod uses the etch-proof paint spay-coating anticorrosive coat of Wear-resistant, high-temperature resistant before the present invention, and purpose is in order to protect drilling rod.The present invention has proposed at the inside and outside surface spraying of common drilling rod body electric insulation layer first, and purpose is in order in electromagnetic wave while-drilling is measured, to improve signal transmission distance effectively.Since similar on common drilling rod and the drill collar structure, only difference to some extent on pipe thickness, and it is big that the common drilling rod of the wall ratio of drill collar is wanted, thereby, can adopt said method processing drill collar equally.
It is a kind of based on using above-mentioned electric communication drilling rod to improve the method for electromagnetic wave while-drilling measuring-signal transmission range that the present invention provides, and the equipment that uses in the method comprises drill string unit, underground survey transmitter unit and signal receiving unit; Operating procedure is following:
⑴, the form of drill string unit with pipe string combination is arranged in the borehole wall, up is connected with lower drilling string, non-magnetic drilling tool, hanging pup joint, insulating short section and upper drilling string in turn from drill bit; Said upper drilling string has comprised electric communication drilling rod and the common drilling rod that is 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;
⑵, the underground survey transmitter unit is installed in non-magnetic drilling tool, hanging pup joint and the insulating short section, in company with drill string unit G.I.H together; The underground survey transmitter unit is split type compound mode or integrated mode; Wherein
A, described split type compound mode up include the end of from successively measures power supply pipe nipple, measurement pipe nipple, emission power pipe nipple, emission pipe nipple and lead assemblies, and said measurement power supply pipe nipple and emission power pipe nipple are respectively the measurement pipe nipple and with the emission pipe nipple energy source and power are provided; Emission pipe nipple one utmost point links to each other with hanging pup joint through the shoulder card, and another utmost point links to each other with the lead terminal fixed tray through armored cable via lead-in wire top assembly;
B, described integrated mode up include the power supply pipe nipple successively, measure emission pipe nipple and lead assemblies the end of from; Be mounted to integrally-built measuring element and ballistic device in the described measurement emission pipe nipple, the power supply pipe nipple connects measurement emission pipe nipple also provides energy source and power for measuring element and ballistic device in it; A utmost point of measuring the driving source of the ballistic device of launching pipe nipple links to each other with hanging pup joint through the shoulder card, and another utmost point links to each other with the lead terminal fixed tray via lead-in wire top assembly through armored cable;
In two kinds of compound modes between each adjacent component through being threaded; Described measurement power supply pipe nipple, measurement pipe nipple, emission power pipe nipple and power supply pipe nipple pass through screw in non-magnetic drilling tool; Described emission pipe nipple and measurement emission pipe nipple are placed on the hanging pup joint; Described lead assemblies is made up of lead-in wire top assembly and lead terminal fixed tray; Lead-in wire top assembly connects the lead terminal fixed tray through armored cable; The lead terminal fixed tray is fixed in the upper drilling string on the electric communication drilling rod, and the bearing of described electric communication drilling rod and lead terminal fixed tray does not spray electric insulation layer;
, at the floor mounted signal receiving unit of derrick, said signal receiving unit is made up of receiving system that is located at ground and earthing electrode, receiving system one utmost point links to each other with derrick, another utmost point links to each other with earthing electrode, earthing electrode inserts ground deeply;
⑷ when, the work of electromagnetic wave while-drilling measuring system; The driving source of the ballistic device of down-hole emission pipe nipple or measurement emission pipe nipple is obstruct with the insulating short section, in emission pipe nipple or measurement emission pipe nipple, armored cable, upper drilling string, stratum and hanging pup joint, forms current loop; Down-hole information is transmitted with form of electromagnetic wave in magnetic field around current loop produces; Receiving system in the signal receiving unit receives electromagnetic wave signal through the potential difference of measuring between earthing electrode and the derrick, and is handled and the information that shows shaft bottom measurement gained by receiving system.
Electric communication drilling rod of the present invention goes for other forms of electromagnetic wave while-drilling equally and measures; Only need the drilling rod on the insulating short section is partly substituted or the common drilling rod of replacing whole with electric communication drilling rod; Launch the distance at the two poles of the earth through electricity consumption communication drilling rod has been extended, avoid the appearance of local eddy currents phenomenon, help the dispersion and the transmission of electromagnetic wave signal; Make the signal voltage that feeds back to ground increase, thereby effectively improve electromagnetic wave while-drilling measuring-signal transmission range.
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 the inside and outside wall spraying of drilling rod electric insulation layer, technology maturation is easy to realize suitability for industrialized production.
2, electric communication drilling rod of the present invention is applied to be installed in the upper end of insulating short section in the electromagnetic wave while-drilling measurement, with the stratum insulation, reduces the loss that near the local eddy currents of insulating short section produces, and improves the transmission range of electromagnetic wave while-drilling measuring-signal effectively.Simultaneously make that also power supply energy is fully utilized, prolong the time that the electromagnetic wave while-drilling measuring apparatus uses in the down-hole.
Description of drawings
Fig. 1 is the generalized section of the present invention's electricity communication drilling rod.
The split type measurement transmitter unit structural representation of Fig. 2 for using in the method for the present invention.
Fig. 3 measures the transmitter unit structural representation for the monolithic of using in the method for the present invention.
Among the above-mentioned figure: 1-drilling rod box end; 2-drilling rod body; The outer electric insulation layer of 3a-; Electric insulation layer in the 3b-; 4-drilling rod pin end; The 5-derrick; The 6-cable; The 7-receiving system; The 8-earthing electrode; The 9-insulating short section; The 10-hanging pup joint; The 11-screw; The 12-non-magnetic drilling tool; The 13-lower drilling string; The 14-drill bit; 15-measures the power supply pipe nipple; 16-measures pipe nipple; 17-emission power pipe nipple; 18-launches pipe nipple; 19-lead-in wire top assembly; The 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 the emission pipe nipple.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description.
Embodiment 1: a kind of electric communication drilling rod of the present invention; Its structure is as shown in Figure 1; Include drilling rod body 2 and coating, described drilling rod body 2 is common drilling rod, and drilling rod body two ends are respectively drilling rod pin end 4 and drilling rod box end 1; Pin end and box end are provided with screw thread, so that drilling rod joins end to end; Described coating is an electric insulation layer; Be divided into electric insulation layer 3b in outer electric insulation layer 3a of drilling rod and the drilling rod, spraying electric insulation layer position is the inside and outside surface of drilling rod except that screw thread and end face, and described electric insulation layer is that ebonite and the spraying of diamond mixed material form; Wherein the diamond particles volume ratio of mixing with ebonite is 1:5; The thickness of diamond particles is 40 orders, and the shear strength of said ebonite is not less than 24MPa, and ebonite selects happy safe 380 for use.
Embodiment 2: a kind of electric communication drilling rod of the present invention, and its structure such as embodiment 1, different is that the volume ratio that diamond particles mixes with ebonite in the described electric insulation layer spray paint is 1:2, and the thickness of diamond particles is 150 orders, and ebonite selects happy safe 4210 for use.
Embodiment 3: the electric communication drilling rod that uses the embodiment of the invention 1 to provide improves the method for electromagnetic wave while-drilling measuring-signal transmission range, and the equipment that uses in the method comprises drill string unit, underground survey transmitter unit and signal receiving unit; Its operating procedure is following, referring to Fig. 2;
⑴, the form of drill string unit with pipe string combination is arranged in the borehole wall, up is 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; Said upper drilling string contains electric communication drilling rod 22 and the common drilling rod 23 that is coated with electric insulation layer from lower to upper, is 9m according to creeping into the strong and weak length of setting the electric communication drilling rod of installation of actual grade and signal;
⑵, the underground survey transmitter unit is installed in non-magnetic drilling tool 12, hanging pup joint 10 and the insulating short section 9, in company with drill string unit G.I.H together; The underground survey transmitter unit adopts split type compound mode; Described split type underground survey transmitter unit up includes successively the end of from and to measure power supply pipe nipple 15, measures pipe nipple 16, emission power pipe nipple 17, emission pipe nipple 18 and lead assemblies, between each adjacent component through being threaded; Described lead assemblies is made up of with lead terminal fixed tray 21 lead-in wire top assembly 19; Said measurement power supply pipe nipple 15 is respectively to measure pipe nipple 16 and launch pipe nipple 18 with emission power pipe nipple 17 provides energy source and power; Ballistic device one utmost point links to each other with hanging pup joint 10 through the shoulder card in the emission pipe nipple 18, and another utmost point links to each other with lead terminal fixed tray 21 through armored cable 20 via lead-in wire top assembly 19; Described measurement power supply pipe nipple 15, measure pipe nipple 16, emission power pipe nipple 17 and emission pipe nipple 18 and be fixed in the non-magnetic drilling tool 12 through screw 11; Described lead terminal fixed tray 21 is fixed on the electric communication drilling rod in the upper drilling string, and the bearing of described electric communication drilling rod and lead terminal fixed tray 21 does not spray electric insulation layer;
⑶, on the ground of derrick, signal receiving unit is installed, signal receiving unit is provided with ground receiving wastewater facility 7 and earthing electrode 8, and receiving system one utmost point links to each other with derrick 5 through cable 6, and another utmost point links to each other with earthing electrode 8, and earthing electrode inserts ground deeply;
⑷ when, the work of electromagnetic wave while-drilling measuring system, the driving source of the ballistic device of down-hole emission pipe nipple 18 is obstruct with insulating short section 9, in emission pipe nipple 18, armored cable 20, upper drilling string, stratum and hanging pup joint 10, forms current loop; Down-hole information is transmitted with form of electromagnetic wave in magnetic field around current loop produces; Receiving system 7 in the signal receiving unit receives electromagnetic wave signal through the potential difference of measuring between earthing electrode 8 and the derrick 5, and is handled and the information that shows shaft bottom measurement gained by receiving system 7.
Embodiment 4: the electric communication drilling rod that uses the embodiment of the invention 2 to provide improves the method for electromagnetic wave while-drilling measuring-signal transmission range, and the equipment that uses in the method comprises drill string unit, underground survey transmitter unit and signal receiving unit; Its operating procedure is following: referring to Fig. 3;
⑴, the form of drill string unit with pipe string combination is arranged in the borehole wall, up is 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 has comprised electric communication drilling rod 22 and the common drilling rod 23 that is coated with electric insulation layer from lower to upper, and the length of electric communication drilling rod is set at 3000m according to actual conditions;
⑵, the underground survey transmitter unit is installed in non-magnetic drilling tool 12, hanging pup joint 10 and the insulating short section 9, in company with drill string unit G.I.H together; Adopt the underground survey transmitter unit of integrated mode; The underground survey transmitter unit of integrated up has power supply pipe nipple 24 successively, measures emission pipe nipple 25 and lead assemblies the end of from, between each adjacent component through being threaded; Described lead assemblies is made up of with lead terminal fixed tray 21 lead-in wire top assembly 19; Be mounted to integrally-built measuring element and ballistic device in the described measurement emission pipe nipple 25, power supply pipe nipple 24 connects measurement emission pipe nipple 25 also provides energy source and power for measuring element and ballistic device in it; A utmost point of measuring the driving source of the ballistic device of launching pipe nipple 25 links to each other with hanging pup joint 10 through the shoulder card, and another utmost point links to each other with lead terminal fixed tray 21 via lead-in wire top assembly 19 through armored cable 20; Described measurement emission pipe nipple 25 and power supply pipe nipple 24 are fixed in the non-magnetic drilling tool 12 through screw 11; On the electric communication drilling rod of form fix in upper drilling string of lead terminal fixed tray 21 with screw thread, the bearing of described electric communication drilling rod and lead terminal fixed tray 21 does not spray electric insulation layer;
, at the floor mounted signal receiving device 7 of derrick 5, receiving system one utmost point links to each other with derrick 5, another utmost point links to each other with the earthing electrode 8 on dark insertion ground;
⑷ when, the work of electromagnetic wave while-drilling measuring system, the driving source of measuring the ballistic device of emission pipe nipple 25 is obstruct with insulating short section 9 equally, in measuring emission pipe nipple 25, armored cable 20, upper drilling string, stratum and hanging pup joint 10, forms current loop; Down-hole information is transmitted with form of electromagnetic wave in magnetic field around current loop produces, and receiving system 7 receives electromagnetic wave signal through the potential difference of measuring between earthing electrode 8 and the derrick 5, and measures the information of gained by the receiving system processing with showing the shaft bottom.
Because the appearance that electric communication drilling rod 22 reduces near the local eddy currents phenomenon of insulating short section has been installed, help the dispersion and the transmission of electromagnetic wave signal, make the voltage that feeds back to ground increase, improved the distance of electromagnetic wave while-drilling measuring-signal transmission.
Embodiment 5: electric communication drilling rod and described method and embodiment 4 are basic identical among the present invention.Different is to use ebonite to select happy safe 4212 for use in the electric communication drilling rod coating; All make electricity consumption communication drilling rod in the upper drilling string.
Embodiment 6: electric communication drilling rod and described method and embodiment 5 are basic identical among the present invention.Different is that the wear-resisting glue that uses in the electric communication drilling rod electric insulation layer is the wear-resisting glue of BD706.
Electric communication drilling rod of the present invention is applied in the electromagnetic wave while-drilling measurement; Electricity communication drilling rod is installed in the upper end of insulating short section; With the stratum insulation, reduce the loss that near the local eddy currents of insulating short section produces, can improve the transmission range of electromagnetic wave while-drilling measuring-signal effectively.
Claims (5)
1. an electric communication drilling rod includes drilling rod body and coating, it is characterized in that: described drilling rod body is common drilling rod, and drilling rod body two ends are respectively pin end and box end, and pin end and box end are provided with screw thread, so that drilling rod joins end to end; Described coating is an electric insulation layer; Be divided into electric insulation layer in outer electric insulation layer of drilling rod and the drilling rod; The spraying electric insulation layer partly be the inside and outside surface of drilling rod except that 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. a kind of electric communication drilling rod according to claim 1, it is characterized in that: described wear-resisting glue is selected the wear-resisting glue of BD706 for use.
3. a kind of electric communication drilling rod according to claim 1; It is characterized in that: the volume ratio of diamond particles and ebonite is 1:5～1:2 in described ebonite and the diamond mixed material; The thickness of diamond particles is 40～150 orders, and described ebonite shear strength is not less than 24MPa.
4. a kind of electric communication drilling rod according to claim 1 is characterized in that: ebonite selects happy safe 380, happy safe 415, happy safe 480, happy safe 4210 or happy safe 4212 for use in the described electric insulation layer.
5. use the described a kind of electric communication drilling rod of claim 1 to improve the method for electromagnetic wave while-drilling measuring-signal transmission range, the equipment that uses in the method comprises drill string unit, underground survey transmitter unit and signal receiving unit; It is characterized in that: operating procedure is following:
⑴, the form of drill string unit with pipe string combination is arranged in the borehole wall, up is connected with lower drilling string, non-magnetic drilling tool, hanging pup joint, insulating short section and upper drilling string in turn from drill bit; Said upper drilling string has comprised electric communication drilling rod and the common drilling rod that is 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;
⑵, the underground survey transmitter unit is installed in non-magnetic drilling tool, hanging pup joint and the insulating short section, in company with drill string unit G.I.H together; The underground survey transmitter unit is split type compound mode or integrated mode; Wherein
A, described split type compound mode up include the end of from successively measures power supply pipe nipple, measurement pipe nipple, emission power pipe nipple, emission pipe nipple and lead assemblies, and said measurement power supply pipe nipple and emission power pipe nipple are respectively the measurement pipe nipple and with the emission pipe nipple energy source and power are provided; Emission pipe nipple one utmost point links to each other with hanging pup joint through the shoulder card, and another utmost point links to each other with the lead terminal fixed tray through armored cable via lead-in wire top assembly;
B, described integrated mode up include the power supply pipe nipple successively, measure emission pipe nipple and lead assemblies the end of from; Be mounted to integrally-built measuring element and ballistic device in the described measurement emission pipe nipple, the power supply pipe nipple connects measurement emission pipe nipple also provides energy source and power for measuring element and ballistic device in it; A utmost point of measuring the driving source of the ballistic device of launching pipe nipple links to each other with hanging pup joint through the shoulder card, and another utmost point links to each other with the lead terminal fixed tray via lead-in wire top assembly through armored cable;
In two kinds of compound modes between each adjacent component through being threaded; Described measurement power supply pipe nipple, measurement pipe nipple, emission power pipe nipple and power supply pipe nipple pass through screw in non-magnetic drilling tool; Described emission pipe nipple and measurement emission pipe nipple are placed on the hanging pup joint; Described lead assemblies is made up of lead-in wire top assembly and lead terminal fixed tray; Lead-in wire top assembly connects the lead terminal fixed tray through armored cable; The lead terminal fixed tray is fixed in the upper drilling string on the electric communication drilling rod, and the bearing of described electric communication drilling rod and lead terminal fixed tray does not spray electric insulation layer;
, at the floor mounted signal receiving unit of derrick, said signal receiving unit is made up of receiving system that is located at ground and earthing electrode, receiving system one utmost point links to each other with derrick, another utmost point links to each other with earthing electrode, earthing electrode inserts ground deeply;
⑷ when, the work of electromagnetic wave while-drilling measuring system; The driving source of the ballistic device of down-hole emission pipe nipple or measurement emission pipe nipple is obstruct with the insulating short section, in emission pipe nipple or measurement emission pipe nipple, armored cable, upper drilling string, stratum and hanging pup joint, forms current loop; Down-hole information is transmitted with form of electromagnetic wave in magnetic field around current loop produces; Receiving system in the signal receiving unit receives electromagnetic wave signal through the potential difference of measuring between earthing electrode and the derrick, and is handled and the information that shows shaft bottom measurement gained by receiving system.
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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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| CN108071351A (en) * | 2017-12-08 | 2018-05-25 | 华中科技大学 | A kind of electrodrill joint structure |
| CN108612523A (en) * | 2018-05-16 | 2018-10-02 | 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 |
| 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 |
| CN109057780A (en) * | 2018-07-12 | 2018-12-21 | 东营市创元石油机械制造有限公司 | In oil drilling with wire communication with bore electromagnetic wave measurement system |
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| 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 |
| CN109057780A (en) * | 2018-07-12 | 2018-12-21 | 东营市创元石油机械制造有限公司 | In oil drilling with wire communication with bore electromagnetic wave measurement system |
| 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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