CN102094627B - Well-head hydraulic signal generating device and operating method thereof - Google Patents
Well-head hydraulic signal generating device and operating method thereof Download PDFInfo
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- CN102094627B CN102094627B CN 201010614215 CN201010614215A CN102094627B CN 102094627 B CN102094627 B CN 102094627B CN 201010614215 CN201010614215 CN 201010614215 CN 201010614215 A CN201010614215 A CN 201010614215A CN 102094627 B CN102094627 B CN 102094627B
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Abstract
The invention relates to a well-head hydraulic signal generating device and an operating method thereof. The well-head hydraulic signal generating device is characterized by comprising a hydraulic oil source, power units, overflow valve banks and pressure test systems. The hydraulic oil source comprises an oil tank, wherein, the side wall of the oil tank is equipped with a temperature sensor and a liquid level sensor, the oil tank is internally equipped with an oil pipeline with a hydraulic oil filter, and the other end of the oil pipeline is connected with the power units; each power unit comprises a hydraulic pump driven by a variable frequency motor, wherein, an input terminal of the hydraulic pump is connected with the oil pipeline, an output terminal of the hydraulic pump is connected with a hydraulic signal pipeline, and the hydraulic signal pipeline is sequentially equipped with a check valve, a pipeline oil filter and a pipeline stop valve; and each overflow valve bank comprises an overflow pipeline, wherein, the overflow pipeline is connected on the hydraulic signal pipeline between the corresponding check valve and pipeline oil filter, an output terminal of the overflow pipeline is connected with a two-position two-way solenoid directional valve and a pilot overflow valve in parallel, an output terminal of the pilot overflow valve is connected with an H-type two-position four-way solenoid directional valve, and an output terminal of the two-position four-way solenoid directional valve is connected with two overflow valves in parallel.
Description
Technical field
The present invention relates to a kind of signal generation apparatus and method of operating thereof, particularly can cooperate the underground hydraulic pressure decoder to realize well head hydraulic pressure signal generating means and the method for operating thereof of the multiple duty of downhole tool for the underground hydraulic pressure control tool provides hydraulic power and control signal about a kind of.
Background technology
The intelligence completion technique is by obtaining down-hole payzone parameter, can be under the control well of ground the production of a plurality of oil-gas Layer.The main ground hydraulic power that adopts reaches the down-hole by hydraulic line with ground power at present, realizes to down-hole executing agency, as the control of sliding sleeve.If only oil-gas Layer is carried out switch control, then can suppress by ground and drive down-hole sliding sleeve action realization oil-gas Layer switch, also can or adopt the wire rope operation carry out switch to target zone by the oil pipe operation.But to control the open degree of down-hole target zone, only depend on simple ground just to suppress relatively difficulty; Adopt conventional production adjustment measure such as oil pipe/steel wire operation just more inconvenient, may need the operation that stops production, influence is produced normally.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide and a kind ofly can realize a plurality of pressure stable signals on ground, and transmit to the down-hole, make the underground hydraulic pressure decoder can base area surface pressure signal and the pipeline sequence realize well head hydraulic pressure signal generating means and method of operating thereof to the control of down-hole target zone.
For achieving the above object, the present invention takes following technical scheme: a kind of well head hydraulic pressure signal generating means is characterized in that: it comprises hydraulic oil source, some power set, some overflow valve groups and some pressure testing systems; Described hydraulic oil source comprises fuel tank, and the sidewall of described fuel tank is provided with temperature pick up and the liquid level sensor that connects supervisory control comuter; Be provided with a petroleum pipeline that has a hydraulic oil filter in the described fuel tank, the other end of described petroleum pipeline connects each described power set; Each described power set comprises the hydraulic pump that drives by variable-frequency motor, the input of described hydraulic pump connects described petroleum pipeline, described hydraulic pressure delivery side of pump connects the hydraulic pressure signal pipeline, is disposed with one way valve, pipeline oil filter and pipeline stop valve on the described hydraulic pressure signal pipeline; Each overflow valve group comprises an overflow line, and described overflow line is connected in the corresponding described power set, on the described hydraulic pressure signal pipeline between described one way valve and the described pipeline oil filter; The output of described overflow line be connected in parallel bi-bit bi-pass solenoid operated directional valve and pilot operated compound relief valve, the output of described pilot operated compound relief valve connects H type two-position four-way solenoid operated directional valve, the output of described two-position four-way solenoid operated directional valve two overflow valves that are connected in parallel; Each described pressure testing system comprises loine pressure table and the line-pressure sensor that is arranged in parallel in described hydraulic pressure signal pipeline and described overflow line junction, and the output of described line-pressure sensor connects supervisory control comuter.
Described power set, overflow valve group and pressure testing system are three.
A kind of method of operating of above-mentioned well head hydraulic pressure signal generating means, it may further comprise the steps: 1) open variable-frequency motor, drive hydraulic pump works, the hydraulic oil in the fuel tank filters the back through the hydraulic oil filter on the petroleum pipeline and flows into hydraulic pump, flows into the hydraulic pressure signal pipeline behind hydraulic pump; 2) hydraulic oil in the hydraulic pressure signal pipeline flows into the shaft bottom through pipeline oil filter and pipeline stop valve successively by pressure setting and the oil circuit control of overflow valve group, provides three kinds of hydraulic pressure signals: 0 pressure signal, threshold pressure signal and high-voltage signal.
Described step 2) in, the control method of overflow valve group is: setting wherein, the pressure of an overflow valve is threshold pressure, the pressure of setting another overflow valve is the high-voltage value greater than threshold pressure, and the pressure of setting pilot operated compound relief valve is the force value greater than the overflow valve high-voltage value; 1. the startup of 0 pressure: disconnect the bi-bit bi-pass solenoid operated directional valve, connect the pilot valve of pilot operated compound relief valve, hydraulic oil flows to the meta H type runner of two-position four-way solenoid operated directional valve through the pilot valve of pilot operated compound relief valve, hydraulic oil flows back to fuel tank, after the pilot valve pressure stability of pilot operated compound relief valve, can open the main valve of pilot operated compound relief valve automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve, and system pressure is 0; 2. the startup of threshold pressure: disconnect the bi-bit bi-pass solenoid operated directional valve, connect the pilot valve of pilot operated compound relief valve, the two-position four-way solenoid operated directional valve left side is switched on, the pilot valve control hydraulic oil of pilot operated compound relief valve is set at the overflow valve of threshold pressure to pressure through two-position four-way solenoid operated directional valve left side bit stream, when pressure reaches threshold pressure, this overflow valve is opened, and hydraulic oil flows back to fuel tank; After the pilot valve pressure stability of pilot operated compound relief valve, can open the main valve of pilot operated compound relief valve automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve, and system pressure remains the threshold pressure that this overflow valve is set; 3. the startup of high pressure: disconnect the bi-bit bi-pass solenoid operated directional valve, connect the pilot valve of pilot operated compound relief valve, with the energising of two-position four-way solenoid operated directional valve the right, the pilot valve control hydraulic oil of pilot operated compound relief valve is set at the overflow valve of high-pressure to pressure through the right bit stream of two-position four-way solenoid operated directional valve, when line pressure equals the high-pressure of this overflow valve setting, this overflow valve is opened, and hydraulic oil flows back to fuel tank; After the pilot valve pressure stability of pilot operated compound relief valve, can open the main valve of pilot operated compound relief valve automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve, and system pressure remains the high pressure that this overflow valve is set.
When emergency decompression, connect two position two-way valve, disconnect pilot operated compound relief valve, the hydraulic oil two position two-way valve left end of flowing through directly flows back to fuel tank, and system pressure is 0, realizes pressure release.
The present invention is owing to take above technical scheme, and it has the following advantages: 1, the present invention can provide cleaning hydraulic oil owing to be provided with hydraulic oil source for apparatus of the present invention by hydraulic oil source.2, the present invention can provide power owing to be provided with power set for apparatus of the present invention by power set.3, the present invention is owing to be provided with the overflow valve group, and an overflow valve in the overflow valve group is set at threshold pressure, and when being lower than threshold pressure, downhole system is regarded as this pressure invalid signals or is spurious signal, and is inoperative to downhole system; When being greater than or equal to threshold pressure, downhole system is regarded as useful signal with this pressure, useful signal comprises the threshold pressure signal, and the high-voltage signal that is higher than the threshold pressure signal, therefore, the present invention can provide the pressure signal of three standards by the overflow valve group to the down-hole: 0 pressure signal, threshold pressure signal and high-voltage signal.4, therefore the present invention, can realize the adjusting of hydraulic pump discharge by regulating the rotating speed of variable-frequency motor because hydraulic pump is driven by variable-frequency motor.5, the present invention can make hydraulic oil can only flow out hydraulic pump owing at the hydraulic pressure signal pipeline one way valve is set by one way valve, therefore, can protect hydraulic pump to avoid flow-reversing impingement.6, therefore the present invention, filters hydraulic oil by the pipeline oil filter because the hydraulic pressure signal pipeline is provided with pipeline oil filter and pipeline stop valve, and cleaning hydraulic oil can be provided to the shaft bottom; Can turn-off oil circuit where necessary by stop valve.Structure setting operation of the present invention is convenient, can provide a plurality of stable hydraulic power and control signal for the underground hydraulic pressure control tool, therefore, can be widely used in the control of downhole tool state.
Description of drawings
Fig. 1 is apparatus of the present invention schematic diagrames
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, the present invention includes hydraulic oil source 1, power set 2, overflow valve group 3 and pressure testing system 4.
In above-described embodiment, according to actual needs, the output of petroleum pipeline 15 some power set 2 that can be connected in parallel all have been arranged in parallel overflow valve group 3 and pressure testing system 4 on each power set 2.Power set 2 shown in the schematic diagram of present embodiment, overflow valve group 3 and pressure testing system 4 are respectively three, only as example, but are not limited thereto.
As shown in Figure 1, be example with one of them power set 2, overflow valve group 3 and pressure testing system 4, the method for operating of apparatus of the present invention may further comprise the steps.
1) open variable-frequency motor 21, variable-frequency motor 21 drives hydraulic pump 22 work, and the hydraulic oil in the fuel tank 11 filters the back through the hydraulic oil filter 14 on the petroleum pipeline 15 and flows into hydraulic pump 22, flows into hydraulic pressure signal pipeline 23 through the hydraulic oil behind the hydraulic pump 22.In this process, can realize the adjusting of hydraulic pump 22 discharge capacities by regulating the rotating speed of variable-frequency motor 21; By the one way valve 24 on the hydraulic pressure signal pipeline 23, make hydraulic oil can only flow out hydraulic pump 22, avoid flow-reversing impingement with protection hydraulic pump 22.
2) force value that arranges by overflow valve group 3, after hydraulic pump 22 is opened, will produce the hydraulic pressure signal that satisfies selected pressure, by hydraulic pressure signal pipeline 23, flow into the shaft bottom through pipeline oil filter 25 and pipeline stop valve 26 successively, hydraulic pressure signal is provided, and hydraulic pressure signal comprises: 0 pressure signal, threshold pressure signal and high-voltage signal.
The method to set up of overflow valve group 3 force value is: the pressure of setting overflow valve 35 is threshold pressure, and the pressure of setting overflow valve 36 is the high-voltage value greater than threshold pressure, and the pressure of setting pilot operated compound relief valve 33 is the force value greater than overflow valve 36 high-voltage values.
1. the startup of 0 pressure:
Disconnect bi-bit bi-pass solenoid operated directional valve 32, connect the pilot valve of pilot operated compound relief valve 33, hydraulic oil flows to two-position four-way solenoid operated directional valve 34 through the pilot valve of pilot operated compound relief valve 33, owing to adopt the two-position four-way solenoid operated directional valve 34 of H type function, the pilot valve control hydraulic oil of pilot operated compound relief valve 33 is through the meta H of two-position four-way solenoid operated directional valve 34 type runner, hydraulic oil flows back to fuel tank, after the pilot valve pressure stability of pilot operated compound relief valve 33, can open the main valve of pilot operated compound relief valve 33 automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve 33, and system pressure is 0.
2. the startup of threshold pressure:
Disconnect bi-bit bi-pass solenoid operated directional valve 32, connect the pilot valve of pilot operated compound relief valve 33, two-position four-way solenoid operated directional valve 34 left sides are switched on, the pilot valve of pilot operated compound relief valve 33 control hydraulic oil through two-position four-way solenoid operated directional valve 34 left bit streams to overflow valve 35, when line pressure equals the threshold pressure of overflow valve 35 settings, overflow valve 35 is opened, and hydraulic oil flows back to fuel tank.After the pilot valve pressure stability of pilot operated compound relief valve 33, can open the main valve of pilot operated compound relief valve 33 automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve 33, and system pressure remains the threshold pressure that overflow valve 35 is set.System pressure can be observed by the loine pressure table 41 in the pressure testing system 4, also can be sent on the supervisory control comuter by the line-pressure sensor 42 in the pressure testing system 4.
3. the startup of high pressure:
Disconnect bi-bit bi-pass solenoid operated directional valve 32, connect the pilot valve of pilot operated compound relief valve 33, two-position four-way solenoid operated directional valve 34 the right are switched on, the pilot valve of pilot operated compound relief valve 33 control hydraulic oil through the right bit stream of two-position four-way solenoid operated directional valve 34 to overflow valve 36, when line pressure equals the high-pressure of overflow valve 36 settings, overflow valve 36 is opened, and hydraulic oil flows back to fuel tank.After the pilot valve pressure stability of pilot operated compound relief valve 33, can open the main valve of pilot operated compound relief valve 33 automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve 33, and system pressure remains the high pressure that overflow valve 36 is set.System pressure can be observed by the loine pressure table 41 in the pressure testing system 4, also can be sent on the supervisory control comuter by the line-pressure sensor 42 in the pressure testing system 4.
In above-described embodiment, when emergency decompression, can connect two position two-way valve 32, disconnect pilot operated compound relief valve 33, hydraulic oil two position two-way valve 32 left ends of flowing through directly flow back to fuel tank, and system pressure is 0, realizes pressure release.
In above-described embodiment, when system cut-off, bi-bit bi-pass solenoid operated directional valve 32 disconnects, and two-position four-way solenoid operated directional valve 34 is got back to meta, and hydraulic oil is controlled hydraulic oil through the meta H of two-position four-way solenoid operated directional valve 34 type runner through the pilot valve of pilot operated compound relief valve 33, hydraulic oil flows back to fuel tank, after the pilot valve pressure stability of pilot operated compound relief valve 33, can open the main valve of pilot operated compound relief valve 33 automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve 33, system pressure is 0, system decompression.
The output of the petroleum pipeline 15 in apparatus of the present invention some power set 2 that can be connected in parallel, overflow valve group 3 and pressure testing system 4 all have been arranged in parallel on each power set 2, and it is the same with the mechanism of action of each pipeline that pressure testing system 4 is formed by power set 2, overflow valve group 3, therefore, the wherein pressure of an overflow valve in each overflow valve group 3 can be set at unified threshold pressure, the pressure of another overflow valve is set at unified high pressure, and the pressure of each pilot operated compound relief valve itself is set at the high-pressure that is higher than overflow valve.On any pipeline, can realize 0 pressure signal of threshold pressure, high-voltage signal and pressure release state thus, in conjunction with the underground hydraulic pressure decoder, realize that corresponding mechanism controls.
Apparatus of the present invention provide the down-hole to carry out original paper on ground power, the hydraulic pressure signal that provides down well placement to control simultaneously.Signal is made up of invalid signals and useful signal.The present invention arranges a threshold pressure, and when being lower than threshold pressure, downhole system is regarded as this pressure invalid signals or is spurious signal, and is inoperative to downhole system; When being higher than when equaling threshold pressure, downhole system is regarded as useful signal with this pressure, and useful signal comprises the threshold pressure signal, and the high-voltage signal that is higher than the threshold pressure signal.
The various embodiments described above only are used for explanation the present invention, and wherein the structure of each parts, connected mode etc. all can change to some extent, and every equivalents and improvement of carrying out on the basis of technical solution of the present invention all should do not got rid of outside protection scope of the present invention.
Claims (5)
1. well head hydraulic pressure signal generating means, it is characterized in that: it comprises hydraulic oil source, some power set, some overflow valve groups and some pressure testing systems;
Described hydraulic oil source comprises fuel tank, and the sidewall of described fuel tank is provided with temperature pick up and the liquid level sensor that connects supervisory control comuter; Be provided with a petroleum pipeline that has a hydraulic oil filter in the described fuel tank, the other end of described petroleum pipeline connects each described power set;
Each described power set comprises the hydraulic pump that drives by variable-frequency motor, the input of described hydraulic pump connects described petroleum pipeline, described hydraulic pressure delivery side of pump connects the hydraulic pressure signal pipeline, is disposed with one way valve, pipeline oil filter and pipeline stop valve on the described hydraulic pressure signal pipeline;
Each overflow valve group comprises an overflow line, and described overflow line is connected in the corresponding described power set, on the described hydraulic pressure signal pipeline between described one way valve and the described pipeline oil filter; The output of described overflow line be connected in parallel bi-bit bi-pass solenoid operated directional valve and pilot operated compound relief valve, the output of described pilot operated compound relief valve connects H type two-position four-way solenoid operated directional valve, the output of described two-position four-way solenoid operated directional valve two overflow valves that are connected in parallel;
Each described pressure testing system comprises loine pressure table and the line-pressure sensor that is arranged in parallel in described hydraulic pressure signal pipeline and described overflow line junction, and the output of described line-pressure sensor connects supervisory control comuter.
2. a kind of well head hydraulic pressure signal generating means as claimed in claim 1, it is characterized in that: described power set, overflow valve group and pressure testing system are three.
3. method of operating of well head hydraulic pressure signal generating means as claimed in claim 1 or 2, it may further comprise the steps:
1) open variable-frequency motor, drive hydraulic pump works, the hydraulic oil in the fuel tank filters the back through the hydraulic oil filter on the petroleum pipeline and flows into hydraulic pump, flows into the hydraulic pressure signal pipeline behind hydraulic pump;
2) hydraulic oil in the hydraulic pressure signal pipeline flows into the shaft bottom through pipeline oil filter and pipeline stop valve successively by pressure setting and the oil circuit control of overflow valve group, provides three kinds of hydraulic pressure signals: 0 pressure signal, threshold pressure signal and high-voltage signal.
4. the method for operating of a kind of well head hydraulic pressure signal generating means as claimed in claim 3, it is characterized in that: described step 2), the control method of overflow valve group is: setting wherein, the pressure of an overflow valve is threshold pressure, the pressure of setting another overflow valve is the high-voltage value greater than threshold pressure, and the pressure of setting pilot operated compound relief valve is the force value greater than the overflow valve high-voltage value;
1. the startup of 0 pressure:
Disconnect the bi-bit bi-pass solenoid operated directional valve, connect the pilot valve of pilot operated compound relief valve, hydraulic oil flows to the meta H type runner of two-position four-way solenoid operated directional valve through the pilot valve of pilot operated compound relief valve, hydraulic oil flows back to fuel tank, after the pilot valve pressure stability of pilot operated compound relief valve, can open the main valve of pilot operated compound relief valve automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve, and system pressure is 0;
2. the startup of threshold pressure:
Disconnect the bi-bit bi-pass solenoid operated directional valve, connect the pilot valve of pilot operated compound relief valve, the two-position four-way solenoid operated directional valve left side is switched on, the pilot valve control hydraulic oil of pilot operated compound relief valve is set at the overflow valve of threshold pressure to pressure through two-position four-way solenoid operated directional valve left side bit stream, when pressure reaches threshold pressure, this overflow valve is opened, and hydraulic oil flows back to fuel tank; After the pilot valve pressure stability of pilot operated compound relief valve, can open the main valve of pilot operated compound relief valve automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve, and system pressure remains the threshold pressure that this overflow valve is set;
3. the startup of high pressure:
Disconnect the bi-bit bi-pass solenoid operated directional valve, connect the pilot valve of pilot operated compound relief valve, with the energising of two-position four-way solenoid operated directional valve the right, the pilot valve control hydraulic oil of pilot operated compound relief valve is set at the overflow valve of high-pressure to pressure through the right bit stream of two-position four-way solenoid operated directional valve, when line pressure equals the high-pressure of this overflow valve setting, this overflow valve is opened, and hydraulic oil flows back to fuel tank; After the pilot valve pressure stability of pilot operated compound relief valve, can open the main valve of pilot operated compound relief valve automatically, hydraulic oil flows back to fuel tank by the main valve of pilot operated compound relief valve, and system pressure remains the high pressure that this overflow valve is set.
5. as the method for operating of claim 3 or 4 described a kind of well head hydraulic pressure signal generating means, it is characterized in that: when emergency decompression, connect the bi-bit bi-pass solenoid operated directional valve, disconnect pilot operated compound relief valve, the hydraulic oil bi-bit bi-pass solenoid operated directional valve left end of flowing through, directly flow back to fuel tank, system pressure is 0, realizes pressure release.
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| CN 201010614215 CN102094627B (en) | 2010-12-30 | 2010-12-30 | Well-head hydraulic signal generating device and operating method thereof |
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| CN 201010614215 CN102094627B (en) | 2010-12-30 | 2010-12-30 | Well-head hydraulic signal generating device and operating method thereof |
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| CN102094627B true CN102094627B (en) | 2013-08-21 |
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| CN108561101B (en) * | 2018-01-10 | 2021-06-15 | 中国海洋石油集团有限公司 | Intelligent well completion device controlled in remote closed-loop pilot mode |
| CN108868707B (en) * | 2018-06-21 | 2020-10-02 | 中国海洋石油集团有限公司 | Hydraulic control intelligent well completion system and control method |
| CN108825182B (en) * | 2018-06-21 | 2020-04-17 | 中国海洋石油集团有限公司 | Mechanical intelligent well underground decoding device and method |
| CN109356899B (en) * | 2018-11-06 | 2020-05-05 | 中国石油大学(华东) | Underground hydraulic system with three pipelines controlling six-layer sliding sleeve |
| CN111663922B (en) * | 2020-04-23 | 2022-07-01 | 中国海洋石油集团有限公司 | Underground decoder system |
| CN111663921B (en) * | 2020-04-23 | 2022-11-08 | 中国海洋石油集团有限公司 | Underground hydraulic system with three pipelines controlling six-layer sliding sleeve |
| CN111982367B (en) * | 2020-08-20 | 2021-10-01 | 临沂会宝岭铁矿有限公司 | Mining belt permanent magnetism cylinder power detection device |
| CN115898344B (en) * | 2023-02-21 | 2023-05-19 | 西南石油大学 | Flow control system and method for downhole travel control |
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| US4390321A (en) * | 1980-10-14 | 1983-06-28 | American Davidson, Inc. | Control apparatus and method for an oil-well pump assembly |
| US5044888A (en) * | 1989-02-10 | 1991-09-03 | Teledyne Industries, Inc. | Variable speed pump control for maintaining fluid level below full barrel level |
| CN2480254Y (en) * | 2001-04-05 | 2002-03-06 | 宝鸡市工程液压件厂 | Combined hydraulic pump station |
| CN201363135Y (en) * | 2009-02-23 | 2009-12-16 | 中国石化集团胜利石油管理局钻井工艺研究院 | Hydraulic automatic control device for protecting gas-oil wells |
| CN202031547U (en) * | 2010-12-30 | 2011-11-09 | 中国海洋石油总公司 | Wellhead hydraulic signal generating device |
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2010
- 2010-12-30 CN CN 201010614215 patent/CN102094627B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4390321A (en) * | 1980-10-14 | 1983-06-28 | American Davidson, Inc. | Control apparatus and method for an oil-well pump assembly |
| US5044888A (en) * | 1989-02-10 | 1991-09-03 | Teledyne Industries, Inc. | Variable speed pump control for maintaining fluid level below full barrel level |
| CN2480254Y (en) * | 2001-04-05 | 2002-03-06 | 宝鸡市工程液压件厂 | Combined hydraulic pump station |
| CN201363135Y (en) * | 2009-02-23 | 2009-12-16 | 中国石化集团胜利石油管理局钻井工艺研究院 | Hydraulic automatic control device for protecting gas-oil wells |
| CN202031547U (en) * | 2010-12-30 | 2011-11-09 | 中国海洋石油总公司 | Wellhead hydraulic signal generating device |
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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 Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee before: China National Offshore Oil Corporation Patentee before: CNOOC Research Center |
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