CN203050684U - Clamp piston and hole diameter logger - Google Patents
Clamp piston and hole diameter logger Download PDFInfo
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- CN203050684U CN203050684U CN 201320005963 CN201320005963U CN203050684U CN 203050684 U CN203050684 U CN 203050684U CN 201320005963 CN201320005963 CN 201320005963 CN 201320005963 U CN201320005963 U CN 201320005963U CN 203050684 U CN203050684 U CN 203050684U
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- backup
- telescoping ram
- mandrel
- compression spring
- bar
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Abstract
The utility model discloses a clamp piston. The clamp piston comprises a core shaft and at least one backup arm. The backup arm comprises two backup rods which can be stretched out or drawn back freely and are of the same structure, the two backup rods are respectively a first backup rod and a second backup rod, the head portions of the two backup rods are hinged mutually, and the tail ends of the two backup rods are respectively hinged with two ends of the core shaft. The clamp piston further comprises an elastic device which can bounce the two backup rods from the core shaft. The clamp piston is simple in structure and strong in reliability.
Description
Technical field
The utility model relates to a kind of logger, particularly, relates to a kind of telescoping ram and caliper logging tool.
Background technology
Telescoping ram is the important device of caliper logging tool, present telescoping ram relies on motor-driven control substantially, and the duty of each backup arm is not independent, in the well logging process, motor-driven poor stability just can stop to measure in case break down, and after the damage of some backup arms, can influence other the operate as normal of backup arm, directly cause the data measured inaccurate even can't measure.
The utility model content
In order to solve the problems of the technologies described above, the utility model discloses a kind of good stability, easy to operate telescoping ram and caliper logging tool.
The disclosed telescoping ram of the utility model comprises mandrel and at least one backup arm, described backup arm comprises the backup bar of two retractables and same structure: the first backup bar and the second backup bar, the head of two backup bars is hinged, tail end is hinged with the two ends of mandrel respectively, and described telescoping ram also comprises described two elastic devices that the backup bar flicks from described mandrel.
Preferably, the described first backup bar comprises rotating shaft, compression spring sleeve, stage clip, push rod and connector, one end and the described mandrel of described rotating shaft are hinged, the other end is fixedlyed connected with an end of described compression spring sleeve, one end of the other end of described compression spring sleeve and described push rod is slidingly connected, and an end of described push rod stretches in the described compression spring sleeve, the other end of described push rod is fixedlyed connected with an end of described connector, the other end of described connector and the described second backup bar are hinged, described stage clip is arranged in the described compression spring sleeve, one end of described stage clip is connected with described rotating shaft, and the other end is connected with described push rod
Preferably, described elastic device comprises the elastic component that is separately positioned on two same structures on described two backup bars, the elastic component of the described first backup bar comprises two arc spring laminations, one end of described two arc spring laminations be fixedly installed on the described first backup bar on, the interior circular arc of described two arc spring laminations is respectively towards the described first backup bar and described mandrel and relative up and down.
Preferably, first groove and second groove are set all on the lower end of the compression spring sleeve of described two backup bars and the described mandrel, the free end of two arc spring laminations in the elastic component of each backup bar all can slide along described first groove and second groove.
Preferably, described telescoping ram also comprises the strip groove that is arranged on described mandrel surface along described mandrel length direction, and described strip groove is relative up and down with described two backup bars.
Preferably, described elastic device also comprises the arc flexure strip that is arranged in the described strip groove, and the interior circular arc of described flexure strip is towards described mandrel, and an end is fixed on the described mandrel.
Preferably, described telescoping ram also comprises wear-resistant block, alignment pin and the elastic cylindrical pin that is arranged on described two backup bar junctions, one end of the connector of described two backup bars all arranges locating slot, described wear-resistant block is arranged in the cavity that two locating slots of described two backup bars form, described two backup bars are hinged by described alignment pin, and described alignment pin passes the geometric center of described wear-resistant block, and described elastic cylindrical pin vertically runs through described wear-resistant block and described alignment pin.
Preferably, described telescoping ram also comprises dog screw, and the circular arc through hole is set on the described wear-resistant block, and described dog screw passes described circular arc through hole and is connected with the described first backup bar.
Preferably, described telescoping ram also comprises the identical magnetic degree sensing device of two structures that is separately positioned on described two backup bars, described magnetic degree sensing device is the anglec of rotation of the rotating shaft of described two the backup bars of monitoring in real time, is sent in the external system by pigtail splice after being converted into the signal of telecommunication.
Preferably, described magnetic degree sensing device comprises electromagnetic coil and magnetic degree sensor, the described first backup bar comprises that also an end is provided with the sheath of locating slot, one end of described rotating shaft stretches in the locating slot of described sheath, and it is hinged by locking bearing pin and described sheath, the end setting electromagnetic coil coaxial with described locking bearing pin of described locating slot stretched in described rotating shaft, the circular groove that the bottom land setting of described locating slot and an end of described rotating shaft cooperatively interact, described magnetic degree sensor and pigtail splice are arranged in the described sheath, one end of described magnetic degree sensor is connected with described pigtail splice, and the other end contacts with described sheath.
Preferably, described electromagnetic coil is five magnetic pole permanent-magnetic clamps.
Preferably, the fixed cover of described pusher slide moved end is blocked in setting on the described compression spring sleeve.
Preferably, on the described compression spring sleeve mud hole is set.
The disclosed caliper logging tool of the utility model comprises the last helmet, top connection, the circuit outer tube that are connected successively, is arranged on electronic circuit, telescoping ram and following helmet in the described circuit outer tube, and described telescoping ram is according to above-mentioned telescoping ram.
The utility model is simple in structure, good reliability, and the receipts of opening of backup arm are not subjected to Electric Machine Control, can compensate automatically with the concrete condition of hole diameter, open receipts freely.Special partition type structure makes that each backup arm duty is relatively independent.Telescoping ram both can " have been gone up and survey " also and can " survey down ".Unfreezing voluntarily when the design of the special construction of wear-resistant block has guaranteed that instrument is hampered in the down-hole.Instrument internal is equipped with high-precision magnetic degree sensor, and the multi-probe metering system of two-way and multi-angle can guarantee to record data more close to actual value.
Description of drawings
Fig. 1 is the sectional view of telescoping ram among the utility model embodiment;
Fig. 2 is the enlarged diagram of A part among Fig. 1;
Fig. 3 is the enlarged diagram of B part among Fig. 1;
Fig. 4 is the structural representation of the utility model embodiment shaft;
Fig. 5 is the structural representation of sheath among the utility model embodiment;
Fig. 6 is the structural representation of caliper logging tool among the utility model embodiment.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, hereinafter will be elaborated to embodiment of the present utility model by reference to the accompanying drawings.Need to prove that under the situation of not conflicting, the feature among present embodiment and the embodiment is any combination mutually.
Among the embodiment of the present utility model, a kind of telescoping ram is disclosed, as Fig. 1-shown in Figure 5, comprise mandrel 7 and at least one backup arm, backup arm comprises the backup bar of two same structures: the first backup bar 8 and the second backup bar 9, one end of the first backup bar 8 and an end of mandrel 7 are hinged, one end of the other end and the second backup bar 9 is hinged, the other end of the other end of the second backup bar 9 and mandrel 7 is hinged, the first backup bar 8 comprises rotating shaft 15, compression spring sleeve 11, stage clip 10, push rod 12 and connector 13, one end and the mandrel 7 of rotating shaft 15 are hinged, the other end is fixedlyed connected with an end of compression spring sleeve 11, one end of the other end of compression spring sleeve 11 and push rod 12 is slidingly connected, and an end of push rod 12 stretches in the compression spring sleeve 11, the other end of push rod 12 is fixedlyed connected with an end of connector 13, the other end of connector 13 and the second backup bar 9 are hinged, stage clip 10 is arranged in the compression spring sleeve 11, one end of stage clip 10 is connected with rotating shaft 7, the other end is connected with push rod 12, and telescoping ram also comprises the elastic device that first support bar 8 and second support bar 9 are flicked from mandrel 7.
Disclosed elastic device comprises the elastic component that is separately positioned on two same structures on the first backup bar 8 and the second backup bar 9 in the present embodiment, elastic component in the first backup bar comprises two arc spring laminations 19,20, two arc spring laminations 19, an end of 20 are fixedly installed in the rotating shaft 7, and two arc spring laminations 19,20 interior circular arc are respectively towards the first backup bar 8 and mandrel 7 and relative up and down.
Lower end and mandrel 7 surfaces of two backup bars 8,9 compression spring sleeve 11 all can arrange first groove and the second groove (not shown), two arc spring laminations 19 in the first backup bar 8,20 free end can slide along first groove and second groove, can prevent that two arc spring laminations 19,20 free end from breakking away, and when two arc spring laminations 19,20 are compressed into maximum deformation quantity, two arc spring laminations 19,20 are compressed in the elongated slot, the backup bar 8 of winning can be fitted tightly with mandrel 7, in like manner, the second backup bar 9 also can as above arrange.
Telescoping ram can arrange the strip groove (not shown) on mandrel 7 surfaces along mandrel 7 length directions, strip groove and two backup bars 8,9 relative up and down.
As the further improvement of above-mentioned embodiment, elastic device also comprises the arc flexure strip 21 that is arranged in the groove, and the interior circular arc of flexure strip 21 is towards mandrel 7, and an end is fixed on the mandrel 7.
Be example with six arm telescoping rams, when well logging, (survey down), instrument is transferred to well with cable, article six, the partition type backup arm is flexible according to the big freedom in minor affairs of hole diameter of the open hole well of direction correspondence separately, when hole diameter diminishes, the push rod of the first backup bar 8 of backup arm is pressed in the compression spring sleeve 11, and stage clip 10 produces compressive strain.In the process of backup arm generation backup distortion, the rotating shaft 15 of the first backup bar, 8 bottoms has produced the angle variation, simultaneously, two arc spring laminations 19,20 between the first backup bar 8 and the mandrel 7 are mutually to pressing, two arc spring laminations 19,20 free end slide along the oval-shaped groove under the first backup bar 8 and produce displacement, when borehole diameter reached the minimum value of apparatus measures scope of this this design, six backup arms then were compressed into mandrel 7 lip-deep six
In the connected in star, and make six arc spring laminations 21 that are arranged in mandrel 7 surface grooves that elastic deformation take place, the free end of arc spring lamination 21 slides along groove and produces change in displacement, the change in displacement of the Y-direction of the backup arm that this moment is all, all be transformed into arc spring lamination 19,20,21 elastic deformation is temporarily stored, the backup arm of instrument all is contracted to minimum state.When borehole diameter during greater than the minimum borehole diameter of the measurement of the novel six arm caliper logging tools of present embodiment, arc spring lamination 19,20,21 all produces deformation at once, give six backup arms of instrument initial elasticity power separately, avoided the anti-death situation attitude of backup arm that forms in the backup arm compression spring deformation process, namely backup arm can't open phenomenon.In like manner, the operating principle of the second backup bar 9 is the same.
Further improvement as above-mentioned embodiment, telescoping ram also comprises and is arranged on two backup bars 8, the wear-resistant block 22 of 9 junctions, alignment pin 25 and elastic cylindrical pin 23, two backup bars 8, one end of 9 connector all arranges locating slot, wear-resistant block 22 is arranged on two backup bars 8, in the cavity that two locating slots of 9 form, two backup bars 8,9 is hinged by alignment pin 25, and alignment pin 25 passes the geometric center of wear-resistant block 22, elastic cylindrical pin 23 vertically runs through wear-resistant block 22 and alignment pin 25, wherein, wear-resistant block 22 can be designed as up-narrow and down-wide similar trapezoidal structure.
Deflection angle is excessive when preventing that wear-resistant block 22 from running into the slit of the borehole wall, can dog screw 26 be set at wear-resistant block 22, and circular arc through hole 24 is set on the wear-resistant block 22, and dog screw 26 passes circular arc through hole 24 and is connected with the first backup bar 8.
Instrument is (when surveying down) in the well logging process, meet when on the bore hole borehole wall crack being arranged, the distortion that can deflect of 22 of the wear-resistant blocks on backup arm top, be that circular arc through hole 24 on the wear-resistant block 22 along the geometric center of wear-resistant block 22 turning to of the relative bore hole borehole wall is taken place, the measurement end face of the wear-resistant block 22 bore hole borehole wall of no longer fitting, 22 of wear-resistant blocks have been avoided the crack of the bore hole borehole wall immediately, have removed instrument and have met the danger that blocks.But the deflection angle limited size of wear-resistant block 22 is in dog screw 26, when running into dog screw 26, the deflection of the top of circular arc through hole 24 becomes no longer deflection, realized the control of deflection angle, this unique design has also been avoided the excessive situation that has caused wear-resistant block 22 to turn-take around alignment pin 25 of deflection angle, and then the situation of avoiding instrument to go no further at place, open hole well crack.
Further improvement as above-mentioned embodiment, telescoping ram also comprises and is separately positioned on two backup bars 8, the identical magnetic degree sensing device of two structures on 9, the magnetic degree sensing device comprises five magnetic pole permanent-magnetic clamps 27, magnetic degree sensor 30 and pigtail splice 31, the first backup bar 8 comprises that also an end is provided with the sheath 32 of locating slot 29, one end of rotating shaft 15 stretches in the locating slot 29 of sheath 32, and by locking bearing pin 33 and sheath 32, mandrel 7 is hinged, the five magnetic pole permanent-magnetic clamps 27 that the end setting that locating slot 29 is stretched in rotating shaft 15 and locking bearing pin 33 are coaxial, the circular groove 28 that the bottom land setting of locating slot 29 and an end of rotating shaft 15 cooperatively interact, magnetic degree sensor 30 and pigtail splice 31 are arranged in the sheath 32, one end of magnetic degree sensor 30 is connected with pigtail splice 31, and the other end contacts with sheath 32.
In the process of backup arm generation backup distortion, the rotating shaft 15 of the first backup bar, 8 bottoms has produced the angle variation, the angle variation takes place in the five magnetic pole permanent-magnetic clamps 27 that drive is installed in above the rotating shaft 15, the angle variation of five magnetic pole permanent-magnetic clamps 27 produces the magnetic degree signal immediately and changes, this variation is gathered in real time by magnetic degree sensor 30, the live signal that collects is sent to logging system by pigtail splice 31, gets final product the curvilinear motion figure that real-time rendering goes out the hole diameter size.
Because the instrument string can rotate with transferring of cable in the down-hole, six arm caliper logging tools of present embodiment are in the process of raising and decentralizing in addition, even it also is different that the angle that two rotating shafts of same backup arm bottom take place changes, so when the instrument well logging of using present embodiment, survey and the following logging effect that combines and to reach best of surveying, curve when six arm caliper logging tools of present embodiment both can provide the curve when surveying that survey also can be provided down, both can provide six radius values of open hole well that the diameter value of three symmetry directions also can be provided, a comprehensive minimum diameter value and a comprehensive maximum gauge value can also be provided, and multiple hole diameter is worth selecting to satisfy the specific (special) requirements of well logging.
The part that stretches into compression spring sleeve 11 for anti-throw-out lever 12 skids off compression spring sleeve 11, can fixed cover 14 be set in compression spring sleeve 11, and the bottom surface page or leaf of push rod 12 is arranged to polygon, and fixed cover 14 can block the bottom surface of push rod 12, and anti-throw-out lever 12 skids off.
(survey down) when well logging, instrument is transferred to well with cable, and again with portable cable on the fixing speed, well liquid was full of the cavity of compression spring sleeve 11 immediately by 4 mud holes 34 on the compression spring sleeve 11 after not having instrument after arrival was specified under the well logging layer position.The compressed push rod 12 that makes of backup arm is pressed in the compression spring sleeve 11 by the borehole wall, and stage clip 10 produces compressive strain.While being pressed into along with push rod 12, a well liquid part that is full of in compression spring sleeve 11 cavities is extruded the mud hole of compression spring sleeve 11 by the bottom surface of push rod, a part of well liquid enters into again in the cavity of compression spring sleeve by the gap of fixed cover 14 with push rod 12 in addition, has so just guaranteed the balance of compression spring sleeve 11 internal pressures.
Another embodiment of the present utility model discloses a kind of caliper logging tool, as shown in Figure 6, comprise the last helmet 1, top connection 2, the circuit outer tube 3 that are connected successively, be arranged on electronic circuit 4, telescoping ram 5 and following helmet 6 in the circuit outer tube 3, telescoping ram 5 is above-mentioned telescoping ram.
Though the disclosed embodiment of the utility model as above, the embodiment that described content just adopts for the ease of understanding the utility model is not in order to limit the utility model.Technician under any the utility model in the technical field; under the prerequisite that does not break away from the disclosed spirit and scope of the utility model; can do any modification and variation in the details of implementing that reaches in form; but scope of patent protection of the present utility model still must be as the criterion with the scope that appending claims was defined.
Claims (14)
1. telescoping ram, comprise mandrel and at least one backup arm, described backup arm comprises two retractables and the identical backup bar of structure: the first backup bar and the second backup bar, the head of two backup bars is hinged, tail end is hinged with the two ends of mandrel respectively, it is characterized in that: described telescoping ram also comprises described two elastic devices that the backup bar flicks from described mandrel.
2. telescoping ram as claimed in claim 1, it is characterized in that: the described first backup bar comprises rotating shaft, compression spring sleeve, stage clip, push rod and connector, one end and the described mandrel of described rotating shaft are hinged, the other end is fixedlyed connected with an end of described compression spring sleeve, one end of the other end of described compression spring sleeve and described push rod is slidingly connected, and an end of described push rod stretches in the described compression spring sleeve, the other end of described push rod is fixedlyed connected with an end of described connector, the other end of described connector and the described second backup bar are hinged, described stage clip is arranged in the described compression spring sleeve, one end of described stage clip is connected with described rotating shaft, and the other end is connected with described push rod.
3. telescoping ram as claimed in claim 2, it is characterized in that: described elastic device comprises the elastic component that is separately positioned on two same structures on described two backup bars, the elastic component of the described first backup bar comprises two arc spring laminations, one end of described two arc spring laminations be fixedly installed on the described first backup bar on, the interior circular arc of described two arc spring laminations is respectively towards the described first backup bar and described mandrel and relative up and down.
4. telescoping ram as claimed in claim 3, it is characterized in that: first groove and second groove all are set on the lower end of the compression spring sleeve of described two backup bars and the described mandrel, and the free end of two arc spring laminations in the elastic component of each backup bar all can slide along described first groove and second groove.
5. telescoping ram as claimed in claim 1, it is characterized in that: described telescoping ram also comprises the strip groove that is arranged on described mandrel surface along described mandrel length direction, described strip groove is relative up and down with described two backup bars.
6. telescoping ram as claimed in claim 5 is characterized in that: described elastic device also comprises the arc flexure strip that is arranged in the described strip groove, and the interior circular arc of described flexure strip is towards described mandrel, and an end is fixed on the described mandrel.
7. telescoping ram as claimed in claim 1, it is characterized in that: described telescoping ram also comprises wear-resistant block, alignment pin and the elastic cylindrical pin that is arranged on described two backup bar junctions, one end of the connector of described two backup bars all arranges locating slot, described wear-resistant block is arranged in the cavity that two locating slots of described two backup bars form, described two backup bars are hinged by described alignment pin, and described alignment pin passes the geometric center of described wear-resistant block, and described elastic cylindrical pin vertically runs through described wear-resistant block and described alignment pin.
8. telescoping ram as claimed in claim 7, it is characterized in that: described telescoping ram also comprises dog screw, and the circular arc through hole is set on the described wear-resistant block, described dog screw passes described circular arc through hole and is connected with the described first backup bar.
9. telescoping ram as claimed in claim 2, it is characterized in that: described telescoping ram also comprises the identical magnetic degree sensing device of two structures that is separately positioned on described two backup bars, described magnetic degree sensing device is the anglec of rotation of the rotating shaft of described two the backup bars of monitoring in real time, is sent in the external system by pigtail splice after being converted into the signal of telecommunication.
10. telescoping ram as claimed in claim 9, it is characterized in that: described magnetic degree sensing device comprises electromagnetic coil and magnetic degree sensor, the described first backup bar comprises that also an end is provided with the sheath of locating slot, one end of described rotating shaft stretches in the locating slot of described sheath, and it is hinged by locking bearing pin and described sheath, the end setting electromagnetic coil coaxial with described locking bearing pin of described locating slot stretched in described rotating shaft, the circular groove that the bottom land setting of described locating slot and an end of described rotating shaft cooperatively interact, described magnetic degree sensor and pigtail splice are arranged in the described sheath, one end of described magnetic degree sensor is connected with described pigtail splice, and the other end contacts with described sheath.
11. telescoping ram as claimed in claim 10 is characterized in that: described electromagnetic coil is five magnetic pole permanent-magnetic clamps.
12. telescoping ram as claimed in claim 2 is characterized in that: arrange on the described compression spring sleeve and block the fixed cover of described pusher slide moved end.
13. telescoping ram as claimed in claim 2 is characterized in that: the mud hole is set on the described compression spring sleeve.
14. caliper logging tool, comprise the last helmet, top connection, the circuit outer tube that are connected successively, be arranged on electronic circuit, telescoping ram and following helmet in the described circuit outer tube, it is characterized in that: described telescoping ram is according to any described telescoping ram of claim 1-13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320005963 CN203050684U (en) | 2013-01-07 | 2013-01-07 | Clamp piston and hole diameter logger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320005963 CN203050684U (en) | 2013-01-07 | 2013-01-07 | Clamp piston and hole diameter logger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203050684U true CN203050684U (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320005963 Expired - Lifetime CN203050684U (en) | 2013-01-07 | 2013-01-07 | Clamp piston and hole diameter logger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203050684U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285510A (en) * | 2016-08-31 | 2017-01-04 | 中国船舶重工集团公司第七八研究所 | A kind of eccentric centralizer for geochemical well logging instrument |
| CN106321077A (en) * | 2015-07-02 | 2017-01-11 | 中石化石油工程技术服务有限公司 | Four-arm microelectrode measuring instrument for borehole diameters |
| CN108533252A (en) * | 2018-06-07 | 2018-09-14 | 北京捷威思特科技有限公司 | Bidirectional electric eccentric |
| CN109869139A (en) * | 2019-04-11 | 2019-06-11 | 中国海洋石油集团有限公司 | A kind of telescoping ram and caliper logging tool |
| CN111520128A (en) * | 2020-06-02 | 2020-08-11 | 中国石油天然气集团有限公司 | Line passing device of backup arm for micro-resistivity scanning imaging logging instrument |
-
2013
- 2013-01-07 CN CN 201320005963 patent/CN203050684U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106321077A (en) * | 2015-07-02 | 2017-01-11 | 中石化石油工程技术服务有限公司 | Four-arm microelectrode measuring instrument for borehole diameters |
| CN106285510A (en) * | 2016-08-31 | 2017-01-04 | 中国船舶重工集团公司第七八研究所 | A kind of eccentric centralizer for geochemical well logging instrument |
| CN108533252A (en) * | 2018-06-07 | 2018-09-14 | 北京捷威思特科技有限公司 | Bidirectional electric eccentric |
| CN109869139A (en) * | 2019-04-11 | 2019-06-11 | 中国海洋石油集团有限公司 | A kind of telescoping ram and caliper logging tool |
| CN111520128A (en) * | 2020-06-02 | 2020-08-11 | 中国石油天然气集团有限公司 | Line passing device of backup arm for micro-resistivity scanning imaging logging instrument |
| CN111520128B (en) * | 2020-06-02 | 2022-05-31 | 中国石油天然气集团有限公司 | Line passing device of backup arm for micro-resistivity scanning imaging logging instrument |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CHINA OILFIELD SERVICES Ltd. Patentee after: CHINA NATIONAL OFFSHORE OIL Corp. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CHINA OILFIELD SERVICES Ltd. Patentee before: CHINA NATIONAL OFFSHORE OIL Corp. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130710 |
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| CX01 | Expiry of patent term |