CN114059983A - Toe end sliding sleeve and oil well tubular column thereof - Google Patents
Toe end sliding sleeve and oil well tubular column thereof Download PDFInfo
- Publication number
- CN114059983A CN114059983A CN202010766826.4A CN202010766826A CN114059983A CN 114059983 A CN114059983 A CN 114059983A CN 202010766826 A CN202010766826 A CN 202010766826A CN 114059983 A CN114059983 A CN 114059983A
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- hole
- sliding sleeve
- mounting hole
- toe end
- body joint
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- 239000003129 oil well Substances 0.000 title claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 238000012546 transfer Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 abstract description 21
- 238000010008 shearing Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Safety Valves (AREA)
Abstract
The invention provides a toe end sliding sleeve and an oil well pipe column thereof, wherein the toe end sliding sleeve comprises: the body joint is provided with an axial through hole, a pressure transfer hole, a rupture disc mounting hole and a rotary conduction valve assembly mounting hole, the pressure transfer hole and the axial through hole are arranged in parallel at intervals, the rupture disc mounting hole is arranged along the radial direction of the body joint and is respectively communicated with the pressure transfer hole and the axial through hole, and the rotary conduction valve assembly mounting hole is arranged on one side of the rupture disc mounting hole in parallel at intervals; the sliding sleeve protective sleeve is fixedly sleeved outside the body joint, an annular space is formed between the sliding sleeve protective sleeve and the body joint, and the pressure transfer hole is communicated with the annular space; the sliding sleeve is arranged in the annular space through a shearing pin; the rupture disc is arranged in the rupture disc mounting hole and can seal the pressure transmission hole; and the rotary conduction valve component is arranged in the rotary conduction valve component mounting hole and can control the opening and closing of the pressure transmission hole. The invention can meet the aim that the sliding sleeve automatically opens to establish the fracturing channel on the premise of not exceeding the pressure value of the pressure test.
Description
Technical Field
The invention relates to the field of petroleum drilling and completion engineering, in particular to a toe end sliding sleeve and an oil well pipe column thereof.
Background
With the continuous progress of drilling technology, horizontal wells of oil and gas wells are longer and longer, and the first-stage fracturing operation mainly based on transmission perforation faces new challenges that a perforating gun cannot be guaranteed to be lowered to the bottom of a well, operation risks are high and the like in ultra-long horizontal wells and deep shale gas horizontal wells. However, most of the various well cementation toe end valves or toe end sliding sleeves in the prior art are unstable in opening pressure and lower than a rated pressure test value (the pressure test pressure of the whole casing is the highest pressure value of fracturing construction operation) of a well casing after well cementation, that is, the requirement of the whole casing pressure test before the first-stage fracturing of an oil and gas well cannot be met, so that the popularization and application of tools are influenced, and inconvenience is brought to later-stage judgment of the integrity and construction operation of the well casing after well cementation.
Disclosure of Invention
The invention provides a toe end sliding sleeve and an oil well pipe column thereof, and aims to achieve the purpose of opening the toe end sliding sleeve by using hydraulic pressure which is not higher than a pressure testing value after the whole well pipe is subjected to pressure testing for a certain time after casing well cementation.
The technical scheme adopted by the invention for solving the technical problems is as follows: a toe sleeve comprising: the body joint is provided with an axial through hole, a pressure transfer hole, a rupture disc mounting hole and a rotary conduction valve assembly mounting hole, the pressure transfer hole and the axial through hole are arranged in parallel at intervals, the rupture disc mounting hole is arranged along the radial direction of the body joint and is respectively communicated with the pressure transfer hole and the axial through hole, and the rotary conduction valve assembly mounting hole is arranged on one side of the rupture disc mounting hole in parallel at intervals; the sliding sleeve protective sleeve is fixedly sleeved outside the body joint, an annular space is formed between the sliding sleeve protective sleeve and the body joint, and the pressure transfer hole is communicated with the annular space; the sliding sleeve is arranged in the annular space through a shearing pin; the rupture disc is arranged in the rupture disc mounting hole and can seal the pressure transmission hole; and the rotary conduction valve component is arranged in the rotary conduction valve component mounting hole and can control the opening and closing of the pressure transmission hole.
Further, the rotary conductance valve assembly includes: the rotary conduction valve is arranged along the radial direction of the body joint and is positioned in the pressure transfer hole, a communicating hole is formed in the valve body of the rotary conduction valve, and the pressure transfer hole can be conducted through the communicating hole; the driving motor is arranged in the rotating conduction valve assembly mounting hole and connected with the upper end valve core of the rotating conduction valve, and the driving motor can drive the rotating conduction valve to rotate at the pressure transmission hole.
Furthermore, still be provided with the delay subassembly mounting hole on the body joint, the delay subassembly mounting hole is located between rupture disc mounting hole and the rotatory conduction valve subassembly mounting hole, and delay subassembly mounting hole and rotatory conduction valve subassembly mounting hole intercommunication, and the toe end sliding sleeve still includes the delay subassembly, sets up in the delay subassembly mounting hole and is connected with rotatory conduction valve subassembly electricity.
Further, the delay assembly includes: the piston exciter can be arranged in the time delay assembly mounting hole in a sliding manner;
the battery timer is arranged in the delay assembly mounting hole and can be connected with the piston exciter in an abutting mode, and the battery timer is connected with the driving motor and can supply power to the driving motor.
Further, the upper end of the rupture disc is fixed in the rupture disc mounting hole through a clamp spring.
Further, the sliding sleeve protective sleeve is connected with the body joint through a locking screw.
Further, the sliding sleeve protective sleeve is provided with a plurality of radial first fracturing holes at intervals, the body joint is provided with a plurality of radial second fracturing holes in one-to-one correspondence with the radial first fracturing holes at intervals, the toe end sliding sleeve further comprises a protection plate, and the protection plate is installed in each radial first fracturing hole and each radial second fracturing hole.
Further, a sealing assembly is arranged between the sliding sleeve protective sleeve and the body joint.
Furthermore, a sealing assembly is arranged between the sliding sleeve and the sliding sleeve protective sleeve, and a sealing assembly is also arranged between the sliding sleeve and the body joint.
The invention also provides an oil well pipe column which comprises a toe end sliding sleeve and an oil production pipe body, wherein the toe end sliding sleeve is the toe end sliding sleeve, and the oil production pipe body is connected with the body joint.
The invention has the advantages that the rupture disc is arranged to meet the requirement that the whole shaft is subjected to pressure test to the designed pressure and the specified pressure test time before fracturing after well cementation, and the opening and closing of the pressure transmission hole can be controlled by rotating the conduction valve component after the rupture disc is crushed, so that the purpose of automatically opening the sliding sleeve to establish the fracturing channel inside and outside the sleeve on the premise of not exceeding the pressure test value can be met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of an embodiment of the present invention when the sliding sleeve is not opened;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a schematic structural view of the embodiment of the present invention when the sliding sleeve is opened;
fig. 4 is a partially enlarged view of fig. 3.
Reference numbers in the figures: 1. a body joint; 2. a clamp spring; 3. a rupture disc; 4. a piston activator; 5. a battery timer; 6. a drive motor; 7. rotating the conduction valve; 8. a pressure transfer hole; 9. a lock screw; 10. a sliding sleeve protective sleeve; 11. a sliding sleeve; 12. a protective sheet; 13. and shearing the pin.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 4, the embodiment of the present invention provides a toe end sliding sleeve, which comprises a body joint 1, a sliding sleeve protective sleeve 10, a sliding sleeve 11, a rupture disc 3 and a rotary communication valve component. The body connects 1 and is provided with axial through hole, passes pressure hole 8, rupture disc mounting hole and rotatory valve module mounting hole that switches on, passes pressure hole 8 and the parallel interval setting of axial through hole, and the rupture disc mounting hole connects 1 radial setting and communicates with passing pressure hole 8 and axial through hole respectively along the body, and the rotatory parallel interval setting of valve module mounting hole that switches on sets up in one side of rupture disc mounting hole. The fixed cover of sliding sleeve protective sheath 10 is established outside body connects 1, and forms the annular space between sliding sleeve protective sheath 10 and the body connects 1, passes pressure hole 8 and annular space intercommunication. The sliding sleeve 11 is arranged in the annulus by means of shear pins 13. The rupture disc 3 is disposed in the rupture disc mounting hole and is capable of closing the pressure transfer hole 8. The rotary conducting valve component is arranged in the rotary conducting valve component mounting hole and can control the opening and closing of the pressure transmission hole 8.
The rupture disk 3 is arranged, so that the pressure test of the whole shaft can be carried out to the designed pressure and the specified pressure test time before fracturing after well cementation, the opening and closing of the pressure transmission hole 8 can be controlled through the rotary conduction valve component after the rupture disk 3 is broken, and the purpose that the sleeve 11 is automatically opened to establish the fracturing channel inside and outside the sleeve on the premise that the pressure value of the pressure test is not exceeded can be met.
It should be noted that the upper end of the rupture disk 3 is fixed in the rupture disk mounting hole through the snap spring 2.
Specifically, the rotary conduction valve assembly includes a rotary conduction valve 7 and a drive motor 6. The rotary conduction valve 7 is arranged along the radial direction of the body joint 1 and is positioned in the pressure transfer hole 8, a communicating hole is formed in the valve body of the rotary conduction valve 7, and the communicating hole can conduct the pressure transfer hole 8. The driving motor 6 is fixedly arranged in the rotary conduction valve assembly mounting hole through a bottom clamping groove and is connected with an upper end valve core of the rotary conduction valve 7, and the driving motor 6 can drive the rotary conduction valve 7 to rotate at the pressure transmission hole 8.
The rotation conduction valve 7 in this embodiment is a ball valve-shaped structure, and a communication hole is provided in the radial direction thereof, and the drive shaft of the drive motor 6 is connected to the rotation conduction valve 7, and the rotation conduction valve 7 can be rotated by the rotation of the drive shaft, as shown in fig. 2 and 4. When the rupture disk 3 is not broken, the communication hole is not communicated with the pressure transfer hole 8, and the pressure transfer holes 8 on both sides of the rotary conduction valve 7 are not conducted, so that the pressure transfer holes 8 are closed. When rupture disc 3 is broken, driving motor 6 can drive rotatory conduction valve 7 and rotate 90 to make the intercommunicating pore communicate with biography pressure hole 8, and then make axial through hole and annular space switch on, thereby can drive sliding sleeve 11 and slide.
Preferably, the body joint 1 is further provided with a delay assembly mounting hole, the delay assembly mounting hole is located between the rupture disc mounting hole and the rotary conduction valve assembly mounting hole, the delay assembly mounting hole is communicated with the rotary conduction valve assembly mounting hole, and the toe end sliding sleeve further comprises a delay assembly, the delay assembly mounting hole is arranged in the delay assembly mounting hole and is electrically connected with the rotary conduction valve assembly.
The time delay assembly is arranged, the requirement that the whole shaft is subjected to pressure testing to the design pressure and the specified pressure testing time before fracturing after well cementation can be met, the sliding sleeve 11 is automatically opened to establish a fracturing channel inside and outside the sleeve on the premise that the pressure does not exceed the pressure testing value after the pressure testing is finished, perforation is not required to be transmitted through the continuous oil pipe, the first-stage fracturing operation can be carried out, the well completion operation efficiency is finally improved, and the well completion construction risk is reduced.
Specifically, the time delay assembly includes a piston energizer 4 and a battery timer 5. The piston energizer 4 is slidably disposed in the delay assembly mounting bore. The battery timer 5 is arranged in the delay assembly mounting hole and can be connected with the piston exciter 4 in an abutting mode, and the battery timer 5 is connected with the driving motor 6 and can supply power to the driving motor 6.
The battery timer 5 in this embodiment is fixed in the delay assembly mounting hole through a thread, the lower end of the battery timer is hermetically arranged in the delay assembly mounting hole, and the lower end of the battery timer 5 is connected with the piston exciter 4 through a spring, so that the battery timer and the piston exciter are ensured not to be in contact under a normal state. When the rupture disk 3 is broken, the pressure in the delay assembly mounting hole rises to push the piston exciter 4 to move upwards against the elastic force of the spring, and then the battery timer 5 is triggered to work.
After the set time is delayed, the battery timer 5 supplies power to the driving motor 6 through a lead and enables the driving motor 6 to work, and under the action of the driving motor 6, the rotary conduction valve 7 rotates by 90 degrees so as to conduct the pressure transmission hole 8.
As shown in fig. 1, the sliding sleeve protective sleeve 10 is provided with a plurality of radial first fracturing holes at intervals, the body joint 1 is provided with a plurality of radial second fracturing holes corresponding to the radial first fracturing holes at intervals, the toe end sliding sleeve further comprises a protection sheet 12, and the protection sheet 12 is installed in each radial first fracturing hole and each radial second fracturing hole. The protective sheet 12 of this embodiment can prevent cement from being consolidated, and the structure thereof is the same as that of the protective sheet 12 in the prior art, and the detailed description thereof is omitted here.
It should be noted that, in this embodiment, a sealing assembly is disposed between the sliding sleeve protection sleeve 10 and the body joint 1. A sealing component is arranged between the sliding sleeve 11 and the sliding sleeve protective sleeve 10, and a sealing component is also arranged between the sliding sleeve 11 and the body joint 1. Through setting up above-mentioned seal assembly can guarantee the stable sealed between each part, avoid liquid to leak.
Further, according to the embodiment of the present invention, a sealing assembly may be disposed between each component as needed to ensure the normal operation of each component.
Further preferably, the sliding sleeve protective sleeve 10 is connected with the body joint 1 through a locking screw 9 to ensure that the sliding sleeve protective sleeve and the body joint are stably connected.
The invention also provides an oil well pipe column which comprises a toe end sliding sleeve and an oil production pipe body, wherein the toe end sliding sleeve is the toe end sliding sleeve, and the oil production pipe body is connected with the body joint 1.
Further, the specific working process of the embodiment of the invention is as follows:
connecting the embodiment to a well cementation casing string according to design requirements, and descending the well cementation casing string to a preset position to provide temporary plugging for the casing string, and performing normal well cementation operation (the sum of the pressure of a wellhead pump and the pressure of a hydrostatic column at the position of a toe end sliding sleeve opened in a delayed manner is smaller than the rupture pressure value of a rupture disc 3 during the well cementation operation); and after the cement is completely solidified and reaches the designed strength after the well cementation operation, performing fracturing construction. During fracturing construction, normally connecting a fracturing wellhead with a fracturing truck, and testing the pressure of a ground pipeline to a design value; after the pressure of a wellhead is relieved, a wellhead valve is opened to enable the fracturing truck to be communicated with a shaft through a ground pipeline, the fracturing truck is started to carry out pressure test to the whole shaft to reach a designed pressure test value (the sum of the pressure test value and the hydrostatic column pressure at the position of a delay opening toe end sliding sleeve is greater than the rupture pressure value of a rupture disk 3), at the moment, the rupture disk 3 in the delay opening toe end sliding sleeve is ruptured, fluid in the shaft flows to a piston exciter 4 and a rotary conduction valve 7 through the rupture disk 3 and is blocked by the rotary conduction valve 7, meanwhile, the fluid pressure pushes the piston exciter 4 to move outwards along the radial direction of a tool to be in contact with a battery timer 5 and starts timing of the battery timer 5, when the battery timer 5 times to a set value, current is automatically supplied to a driving motor 6, the driving motor 6 is started and drives the rotary conduction valve 7 to rotate for 90 degrees, a pressure transmission hole 8 is conducted, the fluid flows to a sliding sleeve 11 along the pressure transmission hole 8 and pushes the sliding sleeve 11 to move along the axial direction of the tool, and (3) communicating the fracturing holes on the body joint 1 and the sliding sleeve protective sleeve 10, establishing an inside and outside fracturing channel (as shown in figure 2), and performing normal first-stage fracturing construction operation.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the invention is mainly used for the first-stage fracturing operation after the well cementation of the oil-gas well, particularly the horizontal well, provides the pressure test of the whole shaft and the fracturing channel between the casing pipe of the first-stage fracturing operation and the ground layer for the fracturing of the oil-gas well, and finally improves the efficiency of well completion operation and reduces the construction risk of the well completion operation.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (10)
1. A toe end sleeve, comprising:
the body joint (1) is provided with an axial through hole, a pressure transfer hole (8), a rupture disc mounting hole and a rotary conduction valve assembly mounting hole, the pressure transfer hole (8) and the axial through hole are arranged in parallel at intervals, the rupture disc mounting hole is arranged along the radial direction of the body joint (1) and is respectively communicated with the pressure transfer hole (8) and the axial through hole, and the rotary conduction valve assembly mounting hole is arranged on one side of the rupture disc mounting hole in parallel at intervals;
the sliding sleeve protective sleeve (10) is fixedly sleeved outside the body joint (1), an annular space is formed between the sliding sleeve protective sleeve (10) and the body joint (1), and the pressure transfer hole (8) is communicated with the annular space;
a sliding sleeve (11) arranged in the annular space by a shear pin (13);
a rupture disc (3) which is arranged in the rupture disc mounting hole and can seal the pressure transmission hole (8);
and the rotary conducting valve assembly is arranged in the rotary conducting valve assembly mounting hole and can control the opening and closing of the pressure transmission hole (8).
2. The toe end slide sleeve of claim 1, wherein said rotary conductance valve assembly comprises:
the rotary conduction valve (7) is arranged along the radial direction of the body joint (1) and is positioned in the pressure transfer hole (8), a communicating hole is formed in the valve body of the rotary conduction valve (7), and the communicating hole can conduct the pressure transfer hole (8);
and the driving motor (6) is arranged in the rotary conduction valve assembly mounting hole and is connected with the upper end valve core of the rotary conduction valve (7), and the driving motor (6) can drive the rotary conduction valve (7) to rotate at the pressure transmission hole (8).
3. The toe end sliding sleeve according to claim 2, wherein a delay assembly mounting hole is further provided on the body joint (1), the delay assembly mounting hole is located between the rupture disc mounting hole and the rotary conduction valve assembly mounting hole, and the delay assembly mounting hole is communicated with the rotary conduction valve assembly mounting hole, and the toe end sliding sleeve further comprises a delay assembly which is arranged in the delay assembly mounting hole and electrically connected with the rotary conduction valve assembly.
4. The toe end slide sleeve of claim 3, wherein said time delay assembly comprises:
a piston exciter (4) slidably disposed within the delay assembly mounting bore;
and the battery timer (5) is arranged in the time delay assembly mounting hole and can be connected with the piston exciter (4) in an abutting mode, and the battery timer (5) is connected with the driving motor (6) and can supply power to the driving motor (6).
5. The toe end sliding sleeve according to claim 1, wherein the upper end of the rupture disk (3) is fixed in the rupture disk mounting hole through a snap spring (2).
6. The toe end socket according to claim 1, wherein the socket protection sleeve (10) is connected to the body joint (1) by a locking screw (9).
7. The toe end sliding sleeve according to claim 1, wherein a plurality of radial first fracturing holes are arranged on the sliding sleeve protective sleeve (10) at intervals, a plurality of radial second fracturing holes corresponding to the radial first fracturing holes in a one-to-one mode are arranged on the body joint (1) at intervals, the toe end sliding sleeve further comprises a protective plate (12), and the protective plate (12) is arranged in each radial first fracturing hole and each radial second fracturing hole.
8. The toe end sliding sleeve according to claim 1, wherein a sealing assembly is provided between the sliding sleeve protective sleeve (10) and the body joint (1).
9. The toe end sliding sleeve according to claim 1, wherein a sealing assembly is arranged between the sliding sleeve (11) and the sliding sleeve protective sleeve (10), and a sealing assembly is also arranged between the sliding sleeve (11) and the body joint (1).
10. An oil well string comprising a toe end slide and a riser body, characterized in that the toe end slide is the toe end slide of any one of claims 1 to 9, the riser body being connected with a body joint (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766826.4A CN114059983A (en) | 2020-08-03 | 2020-08-03 | Toe end sliding sleeve and oil well tubular column thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766826.4A CN114059983A (en) | 2020-08-03 | 2020-08-03 | Toe end sliding sleeve and oil well tubular column thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114059983A true CN114059983A (en) | 2022-02-18 |
Family
ID=80231547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010766826.4A Pending CN114059983A (en) | 2020-08-03 | 2020-08-03 | Toe end sliding sleeve and oil well tubular column thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114059983A (en) |
-
2020
- 2020-08-03 CN CN202010766826.4A patent/CN114059983A/en active Pending
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Effective date of registration: 20221230 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC ENGINEERING TECHNOLOGY R & D Co.,Ltd. Applicant after: BEIJING PETROLEUM MACHINERY Co.,Ltd. Address before: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Applicant before: CHINA NATIONAL PETROLEUM Corp. Applicant before: CNPC ENGINEERING TECHNOLOGY R & D Co.,Ltd. |