CN201464342U - Device for testing interaction mechanism of riser pipe pile soil - Google Patents
Device for testing interaction mechanism of riser pipe pile soil Download PDFInfo
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- CN201464342U CN201464342U CN2009201092965U CN200920109296U CN201464342U CN 201464342 U CN201464342 U CN 201464342U CN 2009201092965 U CN2009201092965 U CN 2009201092965U CN 200920109296 U CN200920109296 U CN 200920109296U CN 201464342 U CN201464342 U CN 201464342U
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- 239000002689 soil Substances 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 230000007246 mechanism Effects 0.000 title claims abstract description 33
- 230000003993 interaction Effects 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 239000013535 sea water Substances 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 43
- 238000012546 transfer Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 230000010534 mechanism of action Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model relates to a device for testing the interaction mechanism of riser pipe pile soil, which comprises a sealed cylinder, a sealed cover, an electric piston elevator force transducer, a test guiding pipe, a plurality of strain type force transducers, a liquid pressure gauge, a hydraulic pump and a control device, wherein the electric piston elevator force transducer is connected with the test guiding pipe through a transverse rod and transmits measured data the control device; the stress type force transducers are arranged at different heights on the outer wall of the test guiding pipe covered by seafloor soil at intervals so as to detect the stresses on the test guiding pipe at different seawater depths and transmit the stresses to the control device in real time; the liquid pressure gauge is used for transmitting acquired information on the pressure of the upper part of a liquid to the control device in real time; an output end of the hydraulic pump is connected with a water inlet on the sealed cover through a hydraulic transmission pipe; the control device is electrically connected with a control end of the hydraulic pump; and a liquid pressure threshold value computing module for the control device to control the water depth in the sealed cylinder and a friction factor computing module are preset in the control device. The device for testing the interaction mechanism of the riser pipe pile soil can measure the action mechanism between the riser pipe and the seafloor soil conveniently, quickly and accurately, and the result has high reliability.
Description
Technical Field
The utility model relates to a water proof pipe stake soil interaction mechanism test device especially is about a water proof pipe stake soil interaction mechanism test device that can simulate different depth of water conditions.
Background
In offshore oil exploration, the safety and the economy of a drilling riser play a crucial role in the exploration and exploitation of the whole oil, the determination of the mud penetration depth of the riser is one of the key technologies of the drilling riser, and the determination of the mud penetration depth of the deep sea riser is the determination of the action mechanism between the riser and the seabed soil. The mechanism of action between the riser and the seabed soil comprises the relationship between the friction coefficient between the riser and the seabed soil and the water depth, the consolidation time of the seabed soil, the pipe diameter of the riser and the properties of the seabed soil. At present, the theory of action between a riser and sand and the calculation of friction between the riser and the sand are not perfect enough, and relevant theoretical guidance is lacked, so that great difficulty is brought to the determination of the depth of the deep sea riser into mud.
Disclosure of Invention
To the above problem, the utility model aims at providing a riser pipe stake soil interaction mechanism test device that can confirm the mechanism of action between riser pipe and the seabed soil.
In order to achieve the purpose, the utility model adopts the following technical proposal: the utility model provides a riser stake soil interaction mechanism test device which characterized in that: the device comprises a sealing cylinder, a sealing cover for sealing the sealing cylinder, an electric piston hoister force measuring sensor, a test guide pipe for simulating a water-proof guide pipe, a plurality of strain type force measuring sensors, a liquid pressure gauge, a hydraulic pump and a control device; wherein, a cross bar for fixing is arranged at the port of the sealing cylinder along the radial direction; the force measuring sensor of the electric piston hoister is connected with the experimental guide pipe through the cross rod, and measured data are transmitted to the control device; the strain type force measuring sensors are arranged at different heights on the outer wall of the test conduit covered by the seabed soil at intervals so as to detect the stress on the test conduit under different seawater depths and transmit the stress to the control device in real time; the liquid pressure gauge is used for transmitting the acquired pressure information of the upper part of the liquid to the control device in real time; the output end of the hydraulic pump is connected with the water inlet on the sealing cover through a hydraulic transmission pipe; the control device is electrically connected with the control end of the hydraulic pump; a liquid pressure threshold calculation module and a friction coefficient calculation module for controlling the water depth in the sealing cylinder by the control device are preset in the control device.
The liquid pressure threshold calculation module is as follows:
P0＝ρgh
the friction coefficient calculation module respectively comprises:
wherein ρ is the density of seawater [ kg/m ]3]G is gravitational acceleration [ N/kg]H is the depth of the seawater to be studied [ m]，P0Is a liquid pressure threshold value [ P ] determined according to the depth of the seawater to be researcheda]Mu is the friction coefficient between the experimental conduit and the seabed soil, G is the gravity of the strain type force transducer, and P is1、P2Respectively measuring the pressure P displayed on the pressure gauge at the beginning and the enda]，A1、A2The cross sectional areas (m) of the piston and the lifting rod of the inner hydraulic cylinder are respectively2]And N is the stress (N) of the experimental conduit measured by the strain-type force-measuring sensor].
The display device is also provided, and the input end of the display device is electrically connected with the output end of the control device.
The force sensor of the electric piston hoister comprises an inner hydraulic cylinder fixed in the center of the cross rod, an inner hydraulic cylinder piston with a hoisting rod at the lower part is arranged in the inner hydraulic cylinder, and the lower part of the hoisting rod is connected with the guide pipe for the test through a hook; the upper end and the lower end of the side wall of the piston of the inner hydraulic cylinder are respectively communicated with a high-pressure transfer pipe, and the high-pressure transfer pipes penetrate through the sealing cylinder and are respectively communicated with an upper cavity chamber and a lower cavity chamber of an outer hydraulic cylinder; the top of the outer hydraulic cylinder is provided with an electric transmission mechanism, and the electric transmission mechanism is connected to an outer hydraulic cylinder piston in the outer hydraulic cylinder; and the pressure gauge is connected in the lower chamber of the outer hydraulic cylinder, displays the pressure of the liquid in the lower chamber of the outer hydraulic cylinder detected by the pressure gauge in real time and transmits the pressure to the control device in real time through a data line.
The hydraulic cylinder piston type hydraulic cylinder comprises a motor, wherein a gear rack mechanism is connected to an output shaft of the motor, and the gear rack mechanism is connected with an outer hydraulic cylinder piston.
The inner hydraulic cylinder is centrally fixed on the cross rod through a sleeve sleeved outside the inner hydraulic cylinder and is suspended in the sealing cylinder.
The utility model discloses owing to take above technical scheme, it has following advantage: 1. the utility model discloses owing to set up sealed section of thick bamboo and sealed lid, set up high pressure resistant sealing material between sealed section of thick bamboo and the sealed lid moreover, consequently provide favourable environment for simulating real seabed high-pressure environment. 2. The utility model discloses owing to set up electric piston lifting machine force cell sensor, it can survey the lifting force to the pipe for the experiment under the different depth of water condition, thereby can calculate the frictional force between seabed soil and the pipe for the experiment, the stress between the seabed soil that each strain type force cell sensor measured and the pipe for the experiment of recombination, just can make statistics of coefficient of friction and the sea water degree of depth between seabed soil and the pipe for the experiment, seabed soil consolidation time, pipe diameter and material for the experiment, the relation between the kind of seabed soil, reach the mechanism of action between water proof pipe and the seabed soil. The utility model discloses can make things convenient for, quick, accurately measure the mechanism of action between riser and the seabed soil, the result reliability is high to can provide scientific, accurate parameter for confirming the minimum income mud degree of depth of riser, have fine economic benefits.
Drawings
FIG. 1 is a schematic view of the structure of the present invention
Detailed Description
The present invention will be described in detail with reference to the following examples.
As shown in fig. 1, the device of the present invention comprises a sealing cylinder 1, a sealing cover 2, a force sensor 3 of an electric piston elevator, a test conduit 4, a plurality of strain force sensors 5, a liquid pressure gauge 6, a hydraulic pump 7 of ultra-high pressure, and a control device 8. The sealing cylinder 1 is a hollow cylindrical cylinder without a cover, a sealing cover 2 for sealing the sealing cylinder 1 is arranged on the port of the cylinder body, and a cross rod 11 for fixing is arranged in the cylinder body along the radial direction close to the port. The sealing cylinder 1 is filled with seawater 12 and seabed soil 13 for experiments, and the sealing cylinder 1 and the sealing cover 2 are sealed by adopting a high-pressure resistant sealing material, so that a sealing space formed in the sealing cylinder 1 can be used for simulating a high-pressure environment of the seabed. In this embodiment, the sealing cylinder 1 and the sealing cover 2 are both made of high-strength steel, the pressure-resistant grades of the two are both 50MPa, and the high-pressure-resistant sealing material may be nitrile butadiene rubber, but is not limited thereto.
The electric piston hoist force-measuring sensor 3 comprises an inner hydraulic cylinder 31, the inner hydraulic cylinder 31 is suspended in the sealing cylinder 1 and is centrally fixed on a cross rod 11 of the sealing cylinder 1 through a sleeve 32 sleeved outside the inner hydraulic cylinder 31, the inner hydraulic cylinder 31 is positioned in the high-pressure environment of the sealing cylinder 1 because the sealing cylinder 1 is filled with seawater 12 and seabed soil 13, the inner hydraulic cylinder 31 comprises an inner hydraulic cylinder piston 33 which divides the inner cavity of the inner hydraulic cylinder 31 into an upper chamber and a lower chamber, the lower part of the inner hydraulic cylinder piston 33 is provided with a lifting rod 34, the lower part of the lifting rod 34 is connected with a test conduit 4 through a hook, the upper end and the lower end of one side wall of the inner hydraulic cylinder piston 33 are respectively and externally communicated with a high-pressure transmission pipe 35, after the two high-pressure transmission pipes 35 penetrate out of the sealing cylinder 1, the upper chamber and the lower chamber which are respectively communicated with the outer hydraulic cylinder piston 37 in the outer hydraulic cylinder 36 and are divided by the outer hydraulic, the electric transmission mechanism 38 comprises an electric motor, a set of rack and pinion mechanism (not shown) is connected to an output shaft of the electric motor, the rack and pinion mechanism is connected to the piston 37 of the outer hydraulic cylinder, when the electric motor works, the rack and pinion mechanism is driven to move up and down, and the piston 37 of the outer hydraulic cylinder is further driven to move, a pressure gauge 39 is connected to the lower chamber of the outer hydraulic cylinder 36, and the pressure gauge 39 displays the detected pressure P of the liquid in the lower chamber of the outer hydraulic cylinder 36 in real time and transmits the pressure P to the control device 8 through a data line in real time.
The process of lifting the test guide pipe 4 by the electric piston lifter force transducer 3 is as follows:
first, the electric transmission mechanism 38 is turned on, the outer cylinder piston 37 is pushed down by the electric transmission mechanism 38, so that the hydraulic oil in the lower chamber of the outer cylinder 36 is transmitted to the inner cylinder 31 through the high-pressure transmission pipe 35, and then the high-pressure oil pushes the inner cylinder piston 33 to move upward, at which time the inner cylinder piston 33 lifts the test conduit 4 through the lifting rod 34. According to the principle of liquid isobaric pressure, the pressure value P of the liquid in the lower chamber of the inner hydraulic cylinder 31 can be obtained by reading the data of the external pressure gauge 39.
In the above embodiment, the test pipe 4 is used to simulate an actual riser pipe, and therefore the diameter and material of the test pipe 4 are selected according to the riser pipe actually used. In this example, the diameter of the test tube 4 is 25.4mm to 340 mm.
The pressure intensity grade of the strain type force measuring sensors 5 can be 10MPa, and the strain type force measuring sensors 5 are arranged at different heights on the outer wall of the test conduit 4 covered by the seabed soil at intervals, such as: the depth of the test conduit 4 into the soil is divided into three equal parts, and the strain type force measuring sensor 5 can be arranged in the middle position of each three equal parts and used for detecting the stress on the test conduit simulating the actual riser and transmitting the detected stress to the control device 8 in real time through a data line.
The pressure-resistant grade of the liquid pressure gauge 6 is 80MPa, the liquid pressure gauge comprises a sensing end 61 and a pressure gauge 62, the sensing end 61 penetrates through the sealing cover 2 and is used for transmitting acquired upper pressure information of liquid to the control device 8 in real time through a data line, and the pressure gauge 62 synchronously displays the upper pressure of the liquid. The output end of the hydraulic pump 7 is connected with the water inlet on the sealing cover 2 through a hydraulic transmission pipe so as to pump seawater 12 into the sealing barrel 1.
The control device 8 adopts a single chip microcomputer, and is connected with the data output ends of the electric piston hoist force-measuring sensor 3, the strain type force-measuring sensor 5 and the liquid pressure gauge 6 and the control end of the hydraulic pump 7 through data lines. A liquid pressure threshold calculation module and a friction coefficient calculation module of the hydraulic pump 7 are preset in the control device 8, wherein the liquid pressure threshold calculation module is as follows:
P0＝ρgh，
where ρ is the density [ kg/m ] of seawater 123]G is gravitational acceleration [ N/kg]H is the depth of the seawater to be studied [ m]，P0Is a liquid pressure threshold value [ P ] determined according to the depth of the seawater to be researcheda]。
The friction coefficient calculation module is as follows:
wherein μ is the friction coefficient between the experimental pipe 4 and the subsoil 13, and G is the gravity [ N ] of the strain gauge load cell 5]，P1、P2Respectively, the pressure P indicated on the first and the second pressure gauges 39a]，A1、A2The cross-sectional areas [ m ] of the piston 33 and the lift rod 34 of the inner hydraulic cylinder, respectively2]，a1Is a calculation coefficient obtained according to experimental statistics; n is the stress [ N ] of the experimental catheter 4 measured by the strain-type force sensor 5]。
In the above embodiments, the strain gauge load cell 5, the liquid pressure gauge 6 and the hydraulic pump 7 are conventional devices in the art and will not be described in detail herein.
In the above embodiment, the utility model discloses still include a display device 9, its input electricity connection controlling means 8's output to show the coefficient of friction of controlling means 8 output and the relation curve graph between the kind of the pipe 4 diameter for the sea bottom soil time, sea water degree of depth, experiment and material, sea bottom soil 13.
The utility model discloses the application method of device includes following step:
1) according to the depth and the property of the seabed soil to be simulated, the diameter and the property of the riser pipe, the corresponding experimental pipe 4 and the seabed soil 13 are selected, and the seabed soil 13 for the experiment is filled into the sealing cylinder 1 to the depth of the seabed soil to be simulated.
2) The control device 8 calculates the pressure threshold P of the seawater 12 at the upper part of the sealing cylinder 1 by utilizing a liquid pressure threshold calculation module according to the seawater depth to be simulated0And controlling the hydraulic pump 7 to pump seawater 12 into the sealing cylinder 1, and when the pressure value output by the liquid pressure gauge 6 just meets the calculated pressure threshold value P of the seawater 120At that time, pumping of seawater 12 is stopped.
3) After the seawater 12 is injected, standing is carried out according to an adjustable standing time interval, then the electric piston hoister force measuring sensors 3 are started, the guide pipes 4 for testing are respectively lifted to the same height with different strain type force measuring sensors 5, and the strain type force measuring sensors 5 and the electric piston hoister force measuring sensors 3 respectively measure N, P1And P2And the curve is transmitted to a control device 8, and a friction coefficient calculation module in the control device 8 calculates a relation curve between the friction coefficient and the consolidation time of the seabed soil and the depth of the seawater and displays the relation curve on a display device 9.
4) By changing the diameter and material of the experimental conduit 4 and the type of the subsoil 13 and changing the high pressure environment of the seabed, the relationship curves between the friction coefficient and the diameter and material of the experimental conduit 4 and between the friction coefficient and the properties of the subsoil 13 can be obtained by the same method and displayed on the display device 9.
5) And repeating the experiment for many times, and counting the relation curves between the friction coefficient and the seabed soil time, the seawater depth, the diameter and the material of the experimental conduit 4 and the type of the seabed soil 13 to obtain the action mechanism between the water-resisting conduit and the seabed soil.
The utility model discloses can make things convenient for, quick, accurately measure the mechanism of action between riser and the seabed soil, the result reliability is high to can provide scientific, accurate parameter for confirming the minimum income mud degree of depth of riser, have fine economic benefits.
In the above embodiments, the structure, the arrangement position, and the connection of each component can be changed, on the basis of the technical solution of the present invention, the improvement and the equivalent transformation performed on individual components should not be excluded from the protection scope of the present invention.
Claims (8)
1. The utility model provides a riser stake soil interaction mechanism test device which characterized in that: the device comprises a sealing cylinder, a sealing cover for sealing the sealing cylinder, an electric piston hoister force measuring sensor, a test guide pipe for simulating a water-proof guide pipe, a plurality of strain type force measuring sensors, a liquid pressure gauge, a hydraulic pump and a control device; wherein,
a cross rod for fixing is arranged at the port of the sealing cylinder along the radial direction; the force measuring sensor of the electric piston hoister is connected with the experimental guide pipe through the cross rod, and measured data are transmitted to the control device; the strain type force measuring sensors are arranged at different heights on the outer wall of the test conduit covered by the seabed soil at intervals so as to detect the stress on the test conduit under different seawater depths and transmit the stress to the control device in real time; the liquid pressure gauge is used for transmitting the acquired pressure information of the upper part of the liquid to the control device in real time; the output end of the hydraulic pump is connected with the water inlet on the sealing cover through a hydraulic transmission pipe; the control device is electrically connected with the control end of the hydraulic pump; a liquid pressure threshold calculation module and a friction coefficient calculation module for controlling the water depth in the sealing cylinder by the control device are preset in the control device.
2. The riser pile soil interaction mechanism test device of claim 1, wherein: the liquid pressure threshold calculation module is as follows:
P0＝ρgh
the friction coefficient calculation module respectively comprises:
wherein ρ is the density of seawater [ kg/m ]3]G is gravitational acceleration [ N/kg]H is the depth of the seawater to be studied [ m]，P0Is a liquid pressure threshold value [ P ] determined according to the depth of the seawater to be researcheda]Mu is the friction coefficient between the experimental conduit and the seabed soil, G is the gravity of the strain type force transducer, and P is1、P2Respectively measuring the pressure P displayed on the pressure gauge at the beginning and the enda]，A1、A2The cross sectional areas (m) of the piston and the lifting rod of the inner hydraulic cylinder are respectively2]N is as defined aboveThe stress [ N ] of the experimental conduit measured by strain type force transducer]。
3. The riser pile soil interaction mechanism test device of claim 2, wherein: the display device is also provided, and the input end of the display device is electrically connected with the output end of the control device.
4. The riser pile soil interaction mechanism test device of claim 1, wherein: the display device is also provided, and the input end of the display device is electrically connected with the output end of the control device.
5. The riser pile-soil interaction mechanism test device of claim 1, 2, 3 or 4, wherein:
the force sensor of the electric piston hoister comprises an inner hydraulic cylinder fixed in the center of the cross rod, an inner hydraulic cylinder piston with a hoisting rod at the lower part is arranged in the inner hydraulic cylinder, and the lower part of the hoisting rod is connected with the guide pipe for the test through a hook; the upper end and the lower end of the side wall of the piston of the inner hydraulic cylinder are respectively communicated with a high-pressure transfer pipe, and the high-pressure transfer pipes penetrate through the sealing cylinder and are respectively communicated with an upper cavity chamber and a lower cavity chamber of an outer hydraulic cylinder; the top of the outer hydraulic cylinder is provided with an electric transmission mechanism, and the electric transmission mechanism is connected to an outer hydraulic cylinder piston in the outer hydraulic cylinder; and the pressure gauge is connected in the lower chamber of the outer hydraulic cylinder, displays the pressure of the liquid in the lower chamber of the outer hydraulic cylinder detected by the pressure gauge in real time and transmits the pressure to the control device in real time through a data line.
6. The riser pile soil interaction mechanism test device of claim 5, wherein: the hydraulic cylinder piston type hydraulic cylinder comprises a motor, wherein a gear rack mechanism is connected to an output shaft of the motor, and the gear rack mechanism is connected with an outer hydraulic cylinder piston.
7. The riser pile soil interaction mechanism test device of claim 5, wherein: the inner hydraulic cylinder is centrally fixed on the cross rod through a sleeve sleeved outside the inner hydraulic cylinder and is suspended in the sealing cylinder.
8. The riser pile-soil interaction mechanism test device of claim 1, 2, 3, 4 or 6, wherein: the inner hydraulic cylinder is centrally fixed on the cross rod through a sleeve sleeved outside the inner hydraulic cylinder and is suspended in the sealing cylinder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201092965U CN201464342U (en) | 2009-06-23 | 2009-06-23 | Device for testing interaction mechanism of riser pipe pile soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201092965U CN201464342U (en) | 2009-06-23 | 2009-06-23 | Device for testing interaction mechanism of riser pipe pile soil |
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| CN201464342U true CN201464342U (en) | 2010-05-12 |
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| CN2009201092965U Expired - Fee Related CN201464342U (en) | 2009-06-23 | 2009-06-23 | Device for testing interaction mechanism of riser pipe pile soil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592588B (en) * | 2009-06-23 | 2012-01-04 | 中国海洋石油总公司 | Pile soil interaction mechanism testing device for riser |
| CN108729439A (en) * | 2018-04-16 | 2018-11-02 | 同济大学 | It is equipped on the implanted local ground watering multiple information acquisition system of prefabricated tubular pile |
-
2009
- 2009-06-23 CN CN2009201092965U patent/CN201464342U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592588B (en) * | 2009-06-23 | 2012-01-04 | 中国海洋石油总公司 | Pile soil interaction mechanism testing device for riser |
| CN108729439A (en) * | 2018-04-16 | 2018-11-02 | 同济大学 | It is equipped on the implanted local ground watering multiple information acquisition system of prefabricated tubular pile |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee after: China National Offshore Oil Corporation Patentee after: CNOOC Research Institute Patentee after: China University of Petroleum (Beijing) Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee before: China National Offshore Oil Corporation Patentee before: CNOOC Research Center Patentee before: China University of Petroleum (Beijing) |
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