CN106930752B - Downhole instrument support cylinder - Google Patents
Downhole instrument support cylinder Download PDFInfo
- Publication number
- CN106930752B CN106930752B CN201710320113.3A CN201710320113A CN106930752B CN 106930752 B CN106930752 B CN 106930752B CN 201710320113 A CN201710320113 A CN 201710320113A CN 106930752 B CN106930752 B CN 106930752B
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- CN
- China
- Prior art keywords
- wire
- downhole
- downhole tool
- junction box
- tool holder
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
Abstract
The invention provides a downhole instrument holder, comprising: the outer side wall of the support cylinder main body is provided with a plurality of mounting grooves for placing downhole instruments; the junction box is arranged on the supporting cylinder main body and is provided with a junction cavity which can be communicated with the plurality of mounting grooves. According to the downhole instrument support barrel, the plurality of downhole instruments are respectively arranged in the plurality of mounting grooves on the outer side wall of the downhole instrument support barrel, the junction box is arranged on the support barrel main body, and the wires of the downhole instruments can be electrically connected in the junction cavities of the junction box, so that communication among the downhole instruments is realized.
Description
Technical Field
The invention relates to an underground instrument support cylinder, in particular to an underground instrument support cylinder in the field of oil gas development.
Background
Currently, there are two main types of downhole instrument holders (carriers) used in the fields of petroleum reservoir dynamic monitoring, well testing, oil and gas well testing, etc: one is to place the downhole instrument inside the support tube, called as an inner hanging support tube, and this structure has a great limitation in application because the instrument is inside the support tube, partially blocks the flow channel, and also limits the passage of other instruments working with ropes; the other is to place the instruments outside the support cylinder, generally called as externally hung support cylinder, the specific practice is to arrange mounting grooves on the outer wall of the support cylinder, place the instruments in the mounting grooves, and a plurality of mounting grooves can be arranged along the circumference of the support cylinder, but because the instruments are respectively placed in different grooves, the electrical connection between the instruments cannot be realized.
Accordingly, there is a need to provide a new downhole tool holder that enables electrical connection of individual tools to overcome the above-described drawbacks.
Disclosure of Invention
The invention aims to provide a downhole instrument support barrel, which can conveniently realize electric connection among a plurality of downhole instruments mounted on a support barrel main body.
The above object of the present invention can be achieved by the following technical solutions:
a downhole tool holder, comprising:
the outer side wall of the support cylinder main body is provided with a plurality of mounting grooves for placing downhole instruments;
the junction box is arranged on the supporting cylinder main body and is provided with a junction cavity which can be communicated with a plurality of mounting grooves.
The downhole instrument support cylinder comprises a support cylinder body, wherein the support cylinder body is sleeved with the junction box, the junction box is sleeved with one end of the support cylinder body, the installation grooves are arranged on the outer wall of the support cylinder body at intervals along the circumferential direction, a plurality of wire channels are arranged on the junction box, and the installation grooves are communicated with the wiring cavity through the wire channels.
The underground instrument support cylinder is characterized in that the support cylinder body is provided with the supporting ring, the junction box is in supporting connection with the supporting ring, one end of the support cylinder body is in threaded connection with the upper connector, the upper connector is provided with the protection cylinder, and the protection cylinder can be hermetically sleeved on the outer side of the junction box.
The underground instrument support cylinder is characterized in that the junction box is located in the middle of the support cylinder body, the mounting grooves are respectively formed in the support cylinder body at two ends of the junction box, a plurality of wire channels are respectively formed in two ends of a wiring cavity of the junction box, and the mounting grooves are communicated with the wiring cavity through the wire channels.
The downhole instrument support cylinder is characterized in that the junction box is a cylinder formed by buckling two semicircular cylinders.
The downhole instrument support cylinder is characterized in that an accommodating cavity is formed in one end of the downhole instrument, a wire connecting pipe is connected between the wire guide channel and the accommodating cavity in a sealing mode, the wire connecting pipe is provided with a wire guide channel, and the accommodating cavity is communicated with the wire connecting cavity through the wire guide channel.
The downhole instrument support barrel comprises the wire connecting pipe, wherein one end of the wire connecting pipe is in threaded connection with the inner wall of the wire guide channel and is in sealing arrangement, the other end of the wire connecting pipe is sleeved with the sealing sleeve, and the sealing sleeve is in threaded connection with the inner wall of the accommodating cavity and is in sealing arrangement.
The downhole instrument support cylinder is characterized in that the wire connection pipe, the sealing sleeve and the wire connection pipe and the sealing sleeve and the inner wall of the accommodating cavity are respectively arranged in a sealing mode through sealing rings.
The downhole instrument support barrel is characterized in that the wiring cavity of the junction box is provided with an operation port, a baffle ring is arranged at the operation port, and the baffle ring can cover the operation port.
The downhole instrument support cylinder is characterized in that a plurality of fixing blocks are arranged on the support cylinder main body, the fixing blocks are fixedly arranged on the outer sides of the mounting grooves, and the downhole instrument is fixed in the mounting grooves through the fixing blocks.
The downhole instrument support cylinder has the characteristics and advantages that:
according to the downhole instrument support barrel, the plurality of downhole instruments are respectively arranged in the plurality of mounting grooves on the outer side wall of the downhole instrument support barrel, the junction box is arranged on the support barrel main body, and the wires of the downhole instruments can be electrically connected in the junction cavities of the junction box, so that communication among the downhole instruments is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a downhole tool holder according to an embodiment of the present invention;
FIG. 2 is a schematic A-A cross-sectional view of a first embodiment of a downhole tool holder of the present invention;
FIG. 3 is a schematic view in section B-B of a first embodiment of a downhole tool holder of the present invention;
FIG. 4 is a schematic diagram of a downhole tool holder according to a second embodiment of the present invention;
FIG. 5 is a schematic D-D cross-sectional view of a second embodiment of a downhole tool holder of the present invention;
FIG. 6 is a schematic E-E cross-sectional view of a second embodiment of a downhole tool holder of the present invention;
FIG. 7 is a schematic diagram of a third embodiment of a downhole tool holder of the present invention;
FIG. 8 is a schematic F-F cross-sectional view of a third embodiment of a downhole tool holder of the present invention;
FIG. 9 is a schematic G-G cross-sectional view of a third embodiment of a downhole tool holder of the present invention;
FIG. 10 is a schematic diagram of a fourth embodiment of a downhole tool holder of the present invention;
FIG. 11 is a schematic H-H cross-sectional view of a fourth embodiment of a downhole tool holder of the present invention;
FIG. 12 is a schematic J-J section view of a fourth embodiment of a downhole tool holder of the present invention.
Reference numerals illustrate: 1. a cartridge body; 10. a mounting groove; 11. a flow channel; 12. an upper end; 13. a propping ring; 14. threading; 2. a downhole tool; 21. a pin holder; 22. a contact pin head; 23. a wire; 24. sealing the inserted link; 25. a receiving chamber; 26. a seal ring; 3. sealing sleeve; 31. a seal ring; 32. a seal ring; 4. a wire connection tube; 41. a wire passing channel; 42. a seal ring; 5. a junction box; 50. a wiring cavity; 51. a seal ring; 52. a seal ring; 53. a wire passage; 54. a baffle ring; 55. an operation port; 6. an upper joint; 61. a protective cylinder; 62. threading; 63. a shoulder; 7. and a fixed block.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, the term "lower end" refers to the right end shown in fig. 1, 4, 7 and 10, and the term "upper end" refers to the left end shown in fig. 1, 4, 7 and 10.
As shown in fig. 1 to 12, the present invention provides a downhole tool holder, comprising: the outer side wall of the support cylinder main body 1 is provided with a plurality of mounting grooves 10 for placing downhole instruments 2; and a junction box 5 provided on the cartridge body 1, the junction box 5 having a junction chamber 50 capable of communicating with the plurality of mounting grooves 10. According to the downhole instrument holder, the plurality of downhole instruments 2 are respectively arranged in the plurality of mounting grooves 10 on the outer side wall of the downhole instrument holder, the junction box 5 is arranged on the holder main body 1, the wires 23 of the downhole instruments 2 can be electrically connected in the junction cavity 50 of the junction box 5, so that communication among the downhole instruments 2 is realized, the downhole instrument holder can conveniently realize electric connection among the plurality of downhole instruments 2, and the wires 23 of the downhole instruments 2 are arranged in one junction cavity 50, so that faults can be conveniently detected.
Specifically, in one embodiment, the bracket main body 1 is a cylinder, and a flow channel 11 is arranged in the bracket main body, and the flow channel 11 can be used for a cable operation instrument to pass through; the outer side wall of the support cylinder main body 1 is provided with a plurality of cylindrical mounting grooves 10, the plurality of mounting grooves 10 are arranged on the outer wall of the support cylinder main body 1 at intervals along the circumferential direction, the mounting grooves 10 can be parallel to the axial direction of the support cylinder main body 1, each mounting groove 10 is internally provided with an underground instrument 2, and the underground instruments 2 can realize the functions of dynamic monitoring of petroleum reservoirs, detection of underground pressure and temperature and the like. The lower end of the holder body 1 is provided with a pin for connection with other tools downhole.
As shown in fig. 1 to 3 and fig. 7 to 9, the junction box 5 is an integrally formed cylinder, and the junction box 5 is fixedly sleeved on the upper end 12 of the bracket main body 1; specifically, in the invention, the supporting cylinder main body 1 is convexly provided with the supporting ring 13, the junction box 5 is sleeved on the upper end 12 of the supporting cylinder main body 1, the lower end of the junction box 5 is propped against the supporting ring 13, one end of the supporting cylinder main body 1 (namely, the upper end of the supporting cylinder main body 1) is further connected with the upper joint 6 in a screwed manner, the upper end of the upper joint 6 is provided with a screw thread 62, the screw thread 62 is used for being connected with other tools, the lower end of the upper joint 6 is provided with a cylindrical protection cylinder 61, the protection cylinder 61 can be sleeved on the outer side of the junction box 5 in a sealing manner, the protection cylinder 61 can ensure the tightness of the wires 23 in the junction box 50, the inner wall of the protection cylinder 61 is provided with a shoulder 63, and the shoulder 63 is propped against the upper end face of the junction box 5 in a state that the protection cylinder 61 is sleeved on the outer side of the junction box 5, so that the axial positioning of the junction box 5 is realized. The protection barrel 61 and the junction box 5 are arranged in a sealing way through a sealing ring 51, and the junction box 5 and the upper end 12 of the bracket barrel body 1 are arranged in a sealing way through a sealing ring 52.
The lower end of the junction box 5 is provided with a plurality of wire passages 53 along the circumferential direction, the plurality of mounting grooves 10 are communicated with the junction cavity 50 through the plurality of wire passages 53, and the wires 23 of the plurality of downhole instruments 2 pass through the wire passages 53 and are electrically connected in the junction cavity 50. The junction cavity 50 of the junction box 5 is an annular slot formed in the wall of the outer cylinder of the junction box 5, the opening of the annular slot is an operation port 55, and an operator can electrically connect a plurality of wires 23 penetrating into the junction cavity 50 at the operation port 55; when the wire 23 fails, maintenance can be performed at the operation port 55.
In the embodiments shown in fig. 4 to 6 and fig. 10 to 12, unlike the embodiments shown in fig. 1 and fig. 7, the junction box 5 is located in the middle of the barrel body 1, the plurality of mounting grooves 10 are respectively located on the barrel body 1 at two ends of the junction box 5, the barrel walls at two ends of the junction box 5 are respectively provided with a plurality of wire channels 53, and the plurality of mounting grooves 10 are communicated with the wire cavity 50 through the plurality of wire channels 53, that is, the wires 23 of the downhole tools 2 pass through the plurality of wire channels 53 to realize electrical connection in the wire cavity 50. The cartridge body 1 may no longer be connected to the upper connector 6, and a screw thread 14 may be provided at the upper end of the cartridge body 1 for connection with other tools.
Specifically, in this embodiment, as shown in fig. 4 and 10, the middle portion of the cartridge body 1 is provided with an annular groove (not shown) in which the junction box 5 is fixedly provided. In a possible embodiment, the junction box 5 may be a cylinder formed by two semicircular cylinders connected in a butt-buckling manner; alternatively, the junction box 5 may be a cylinder formed by splicing a plurality of fan rings. The two semicircular barrels or the plurality of fan rings can be fixed on the supporting barrel main body 1 through bolts, so that the junction box 5 and the supporting barrel main body 1 are fixedly connected. The junction chamber 50 is a groove formed in the middle of the outer side wall of the junction box 5, and a plurality of wire passages 53 are formed on both sides of the junction chamber 50 and communicate with the junction chamber 50. The plurality of mounting grooves 10 are arranged on the supporting cylinder main body 1 at two sides of the junction box 5, and the wires 23 of the downhole instrument 2 in the mounting grooves 10 can pass through the wire channel 53 to realize electric connection in the junction cavity 50.
The above two embodiments in which the junction box 5 is located at the upper end 12 of the holder body 1 and the middle of the holder body 1, respectively, in the case of these two embodiments, there are also two embodiments in which the wire 23 of the downhole tool 2 is connected to the junction cavity 50 of the junction box 5, which can be arbitrarily applied to any one of the two examples of the junction box 5, and are not limited herein:
in one embodiment of connecting the wire 23 of the downhole tool 2 with the wiring cavity 50 of the junction box 5, as shown in fig. 1 to 6, one end of the downhole tool 2 close to the junction box 5 is provided with a containing cavity 25, the containing cavity 25 is provided with a pin seat 21 and a pin head 22 which are mutually inserted, the wire 23 is connected with the pin head 22, and the pin head 22 is detachably inserted into the pin seat 21, so that the wire 23 and the downhole tool 2 can be conveniently assembled and disassembled; in this embodiment, a connection tube 4 is hermetically connected between the wire passage 53 and the accommodating cavity 25, the connection tube 4 has a wire passage 41, the contact pin 22 is fixedly connected to one end of the wire passage 41, and the wire 23 can pass through the wire passage 41 and pass out from the other end of the wire passage 41, so that the wire 23 can be threaded into the wire passage 53 through the wire passage 41, and the purpose that the wires 23 of the downhole tools 2 can be electrically connected to each other in the connection cavity 50 is achieved.
In the invention, one end of the wiring tube 4 close to the accommodating cavity 25 is sleeved with the sealing sleeve 3, the sealing sleeve 3 is a cylinder, the sealing sleeve 3 is in threaded connection and sealed arrangement with the inner wall of the accommodating cavity 25, and the other end of the wiring tube 4 is in threaded connection and sealed arrangement with the inner wall of the wire guide channel 53. In a specific embodiment, the wire connection pipe 4 and the inner wall of the wire guide channel 53 are sealed by the sealing ring 42, and the end face of the wire connection pipe 4, which is close to one end of the wire guide channel 53, is also provided with a metal conical surface, and sealing is realized by tightly attaching the metal conical surface to the end face of the wire guide channel 53, so that the wire connection pipe is used as an auxiliary means for sealing by the sealing ring 42; the sealing sleeve 3 is arranged in a sealing way with the inner wall of the accommodating cavity 25 through a sealing ring 31, and meanwhile, the sealing sleeve 3 is connected with the inner wall of the accommodating cavity 25 through threads; the wiring tube 4 and the sealing sleeve 3 are arranged in a sealing way through the sealing ring 32, and the sealing of the sealing ring can well ensure that the lead 23 cannot be corroded and damaged by external liquid, so that the normal communication between the leads 23 of the downhole instrument 2 is ensured.
In another embodiment of the connection between the wire 23 of the downhole tool 2 and the wiring cavity 50 of the junction box 5, as shown in fig. 7 to 12, unlike the embodiment shown in fig. 1 and 4, the downhole tool 2 is not provided with a receiving cavity 25, one end of the downhole tool 2 near the junction box 5 is convexly provided with a sealing insert rod 24, an internal wire of the downhole tool 2 is penetrated in the sealing insert rod 24, the sealing insert rod 24 can be hermetically arranged with a wire channel 53 through a plurality of sealing rings 26, a pin seat 21 is arranged at the free end of the sealing insert rod 24, a pin head 22 is further arranged in the wire channel 53, the wire 23 is positioned in the wire channel 53 and connected to the pin head 22, the pin head 22 and the pin seat 21 are detachably connected for easy dismounting operation, and after the pin head 22 and the pin seat 21 are connected in a plugging manner, the purpose of communicating the internal wire of the downhole tool 2 with the wire 23 can be achieved, so that the downhole tools 2 are mutually electrically connected in the wiring cavity 50 through the wire 23.
According to one embodiment of the present invention, a plurality of fixing blocks 7 are provided on the cartridge body 1, the fixing blocks 7 are also fan rings, the plurality of fixing blocks 7 are fixedly installed outside the plurality of installation grooves 10, the fixing blocks 7 can be fixed on the cartridge body 1 by bolts, and the downhole tool 2 is fixed on the installation grooves 10 by the fixing blocks.
According to one embodiment of the present invention, as shown in fig. 1 and 7, a blocking ring 54 is provided at the operation port 55, and the blocking ring 54 is a circular ring, which can cover the operation port 55, thereby protecting the wires 23 in the wire connection cavity 50.
The downhole instrument holder of the invention is characterized in that a plurality of downhole instruments 2 are respectively arranged in a plurality of mounting grooves 10 on the outer side wall of the downhole instrument holder, a junction box 5 is arranged on the holder main body 1, and wires 23 of the downhole instruments 2 can be electrically connected in a junction cavity 50 of the junction box 5, so that communication among the downhole instruments 2 is realized.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (6)
1. A downhole tool holder, the downhole tool holder comprising:
the outer side wall of the support cylinder main body is provided with a plurality of mounting grooves for placing downhole instruments;
the junction box is arranged on the supporting cylinder main body and is provided with a junction cavity which can be communicated with the mounting grooves, and the downhole instruments are electrically connected in the junction cavity;
the terminal box is the drum that is formed by two semicircle ring section of thick bamboo butt-joint connection, the middle part of holding in the palm the section of thick bamboo main part is equipped with the annular groove, two semicircle ring section of thick bamboo joint is in the annular groove, a plurality of the mounting groove is located respectively hold in the palm in the section of thick bamboo main part at terminal box both ends, the both ends of the wiring chamber of terminal box are equipped with a plurality of wire passageway respectively, a plurality of the mounting groove is through a plurality of wire passageway with the wiring chamber is linked together.
2. The downhole tool holder according to claim 1, wherein an end of the downhole tool is provided with a receiving chamber, a wire pipe is connected between the wire passage and the receiving chamber in a sealing manner, the wire pipe is provided with a wire passage, and the receiving chamber is communicated with the wire chamber through the wire passage and the wire passage.
3. The downhole tool holder of claim 2, wherein one end of the wire-receiving tube is threaded and sealingly disposed with an inner wall of the wire passage, and the other end of the wire-receiving tube is sleeved with a sealing sleeve, which is threaded and sealingly disposed with an inner wall of the receiving chamber.
4. A downhole tool holder according to claim 3, wherein the sealing rings are arranged between the connection tube and the inner wall of the wire channel, between the sealing sleeve and the connection tube, and between the sealing sleeve and the inner wall of the receiving chamber, respectively.
5. The downhole tool holder of claim 1, wherein the junction chamber of the junction box is provided with an operation port, and wherein the operation port is provided with a retainer ring capable of covering the operation port.
6. The downhole tool holder according to claim 5, wherein a plurality of fixing blocks are provided on the holder body, the plurality of fixing blocks are fixedly installed outside the plurality of installation grooves, and the downhole tool is fixed in the installation grooves by the fixing blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710320113.3A CN106930752B (en) | 2017-05-09 | 2017-05-09 | Downhole instrument support cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710320113.3A CN106930752B (en) | 2017-05-09 | 2017-05-09 | Downhole instrument support cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106930752A CN106930752A (en) | 2017-07-07 |
| CN106930752B true CN106930752B (en) | 2023-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710320113.3A Active CN106930752B (en) | 2017-05-09 | 2017-05-09 | Downhole instrument support cylinder |
Country Status (1)
| Country | Link |
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| CN (1) | CN106930752B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108086920B (en) * | 2017-11-27 | 2019-06-28 | 中国石油集团西部钻探工程有限公司 | Wire passing device |
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|---|---|---|---|---|
| SU1165770A1 (en) * | 1981-02-20 | 1985-07-07 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Геофизических Исследований Геолого-Разведочных Скважин | Fluid-tight semicoupling for joining geophysical cable to down-hole instrument |
| CN2228976Y (en) * | 1994-09-02 | 1996-06-12 | 华北石油管理局油气井测试公司 | Direct reading electronic manometer carrier |
| CN2602161Y (en) * | 2003-02-18 | 2004-02-04 | 陈火英 | Safety device for down-hole apparatus tap |
| CN2760226Y (en) * | 2004-09-09 | 2006-02-22 | 徐凌堂 | A downhole optoelectronic safety leak-proof halter for well logging |
| CA2794785A1 (en) * | 2011-11-21 | 2013-05-21 | Sondex Wireline Limited | Flexible sealing connector |
| CN204754910U (en) * | 2015-07-17 | 2015-11-11 | 四川省科学城久利电子有限责任公司 | Improved generation oil field is electric -magnetic flow meter in pit |
| CN205714140U (en) * | 2016-06-13 | 2016-11-23 | 贵州天石能源科技有限公司 | The wire of a kind of band flow channels introduces structure |
| CN206972224U (en) * | 2017-05-09 | 2018-02-06 | 西安天照伟成电气有限公司 | Downhole instrument support cylinder |
-
2017
- 2017-05-09 CN CN201710320113.3A patent/CN106930752B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1165770A1 (en) * | 1981-02-20 | 1985-07-07 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Геофизических Исследований Геолого-Разведочных Скважин | Fluid-tight semicoupling for joining geophysical cable to down-hole instrument |
| CN2228976Y (en) * | 1994-09-02 | 1996-06-12 | 华北石油管理局油气井测试公司 | Direct reading electronic manometer carrier |
| CN2602161Y (en) * | 2003-02-18 | 2004-02-04 | 陈火英 | Safety device for down-hole apparatus tap |
| CN2760226Y (en) * | 2004-09-09 | 2006-02-22 | 徐凌堂 | A downhole optoelectronic safety leak-proof halter for well logging |
| CA2794785A1 (en) * | 2011-11-21 | 2013-05-21 | Sondex Wireline Limited | Flexible sealing connector |
| CN204754910U (en) * | 2015-07-17 | 2015-11-11 | 四川省科学城久利电子有限责任公司 | Improved generation oil field is electric -magnetic flow meter in pit |
| CN205714140U (en) * | 2016-06-13 | 2016-11-23 | 贵州天石能源科技有限公司 | The wire of a kind of band flow channels introduces structure |
| CN206972224U (en) * | 2017-05-09 | 2018-02-06 | 西安天照伟成电气有限公司 | Downhole instrument support cylinder |
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| CN106930752A (en) | 2017-07-07 |
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