CN207111064U - A kind of liquid CO2Pressure break low-pressure manifold device - Google Patents
A kind of liquid CO2Pressure break low-pressure manifold device Download PDFInfo
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- CN207111064U CN207111064U CN201721009968.6U CN201721009968U CN207111064U CN 207111064 U CN207111064 U CN 207111064U CN 201721009968 U CN201721009968 U CN 201721009968U CN 207111064 U CN207111064 U CN 207111064U
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Abstract
The utility model discloses a kind of liquid CO2Pressure break low-pressure manifold device, its CO2Tank car, liquid phase header, booster pump, closed fracturing blender truck, pressure break pump truck are sequentially connected composition liquid phase pipeline by pipeline and liquid phase valve, being divided into two-way, pipeline offer load fluid adds sand all the way, another way provides pure liquid phase, and independently of each other, can effectively coordinate the emergency situations such as processing pipeline thorn leakage.CO2Tank car, liquid nitrogen pump vehicle, liquid nitrogen tank car, gas phase header, pressure break pump truck pipe are sequentially connected composition gas phase pipeline by pipeline and gas valve, and N is provided at any time according to situation2, ensure that feed flow is stable, avoid finishing the possibility of dry ice；When empty pump situation occurs in certain pressure break pump truck, CO can be controlled by switching respective valve2Liquid and N2Supply, realize online walk pump, finally recover its construction ability；N can also be used rapidly after construction terminates2Replace the CO in all pipelines in clean ground and equipment2, then carry out bleeding off pressure processing, it is safe and quick.
Description
Technical field
It the utility model is related to oil-gas field fracturing technical field of construction, and in particular to a kind of liquid CO2Pressure break low-pressure manifold
Device.
Background technology
Liquid CO2Pressure break is with CO2Instead of a kind of anhydrous fracturing technique of conventional hydraulic fracturing fluid, there are many common pressures
The advantages of do not had is split, therefore is received much concern.
General common liquid CO2The connected mode of pressure break low-pressure manifold device is：Some CO2Tank car is in parallel, then successively
With CO2Pressurization pump truck, closed fracturing blender truck are connected, and give pressure break pump truck feed flow.Because of liquid CO2Fracture job liquid has low temperature height
Problems be present in the characteristics of pressure, the low-pressure manifold device connected in this way：(1) with CO2CO in tank car2Consumption,
CO2The volume increase of tank interior space, pressure reduce, part CO2Gas is flashed to, maintains CO2Pressure balance in tank car, but work as
CO2Tank car inside points CO2The pressure of evaporation supplement is less than CO2When liquid level reduces caused pressure drop in tank car, CO2In tank car
Decline with feed flow pipeline internal pressure power, when pressure declines to a certain extent, CO2In tank car and feed flow pipeline internal memory is in knot dry ice
Risk, there may be blast at any time；(2) phase after construction, CO2When feed flow liquid level reduces in tank car, occur that construction supplies in tank
Liquid shakiness situation, influences construction quality；(3) if empty pump, this fracturing pump occurs in certain, work progress mesohigh area pressure break pump truck
Car terminates until construction, can not be continuing with, influence construction quality, or even can not continue to construct；(4) after construction terminates, it is
Prevent from tying dry ice, it is necessary to bleed off pressure at a slow speed, it usually needs could remove pipeline after 4-7 days.
In summary, how solving low pressure feed flow flow, when feed flow liquid level reduces, feed flow is unstable, easy the problem of tying dry ice,
And when solving how to ensure that empty pump situation occurs in certain pressure break pump truck, under continuous condition of construction, realize that walking pump online recovers
The problem of its construction ability, while the problem that construction is quickly bled off pressure after terminating to pipeline can be also realized, become this area
Technical staff's urgent problem to be solved.
Utility model content
In view of this, the utility model provides a kind of liquid CO2Pressure break low-pressure manifold device, can solve easily to tie dry ice
Risk and construction later stage feed flow shakiness the problem of, and can ensures in the case of empty pump occurs in higher-pressure region pressure break pump truck,
It can realize that walking pump online recovers its construction ability under continuous condition of construction, while after also realizing that construction terminates, in safety
On the premise of pipeline is quickly bled off pressure.
To achieve the above object, the utility model provides following technical scheme：
A kind of liquid CO2Pressure break low-pressure manifold device, including the CO being sequentially connected2Tank car, the first liquid phase header, booster pump
With pressure break liquid-supplying system；
Also include liquid nitrogen tank car, liquid nitrogen pump vehicle and the first gas phase header being sequentially connected, multiple CO2Tank car is all connected with
In the first gas phase header.
Preferably, the pressure break liquid-supplying system includes pressure break pump truck；The entrance of every pressure break pump truck is all connected to institute
State the outlet of the first gas phase header；The outlet of the pressure break pump truck is connected with pressure release valve all the way, and another way is connected with high pressure valve.
Preferably, the pressure break liquid-supplying system includes：Add sand liquid-supplying system and pure liquid phase liquid-supplying system；
Described plus sand liquid-supplying system includes the closed fracturing blender truck, second liquid phase header and the fracturing pump for adding sand being sequentially connected
Car, the outlet of the booster pump connect the import of the closed fracturing blender truck all the way；
The pure liquid phase liquid-supplying system includes the pressure break pump truck for the 3rd liquid phase header and pure liquid phase being sequentially connected, the increasing
The outlet another way of press pump connects the import of the 3rd liquid phase header.
Preferably, the closed fracturing blender truck in the pressure break liquid-supplying system is to be connected in parallel more.
Preferably, the booster pump is to be connected in parallel more.
It can be seen from the above technical scheme that liquid CO provided by the utility model2Pressure break low-pressure manifold device, passes through
Gas phase pipeline liquid nitrogen pump vehicle can be according to needing at any time to every CO2Tank car supplements N2, keep every CO2Tank car inner pressure constant,
So as to ensure later stage CO of constructing2When tank car liquid level reduces, still ensure that feed flow is stable, while ensure CO2Liquid is in CO2Tank car or
Pressure is not less than 75.9PSI in pipeline, and then avoids the appearance of dry ice；Such as occurs the burst of separate unit pressure break pump truck sky pump simultaneously
It is rapid to split pump truck supplement N to empty pump pressure on the premise of ensureing to continue construction during situation2, replaced fracturing pump in-car portion CO2Liquid
Body carries out open flow processing, can recover its construction after walking pump again；N can also be used rapidly after construction terminates2Replace clean ground
CO in all pipelines and equipment2, carrying out bleeding off pressure processing, it is safe and quick.Liquid phase pipeline is divided into two-way, and pipeline is pressure all the way
Pump truck offer load fluid is provided and adds sand, pipeline provides pure liquid phase for pressure break pump truck all the way, and independently of each other, effectively cooperation can handle
The emergency situations such as pipeline thorn leakage.Vapor delivery line can provide certain pressure by gas valve control in pipeline purging and open flow stage
N2, while can also be according to the N for needing to provide certain pressure to pipeline and construction equipment at any time2, prevent tie dry ice situation hair
It is raw, it ensure that construction safety.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation for the liquid CO 2 pressure break low-pressure manifold device that the utility model embodiment provides.
Wherein, 1 is CO2Tank car；2 be the first liquid phase header；3 be booster pump；4 be closed fracturing blender truck；5 be liquid phase valve；6 are
First gas phase header；7 be gas valve；8 be liquid nitrogen pump vehicle；9 be liquid nitrogen tank car；10 be pressure break pump truck；11 be second liquid phase header；
12 be the 3rd liquid phase header；13 be the second gas phase header；14 be to add sand liquid-supplying system；15 be pure liquid phase liquid-supplying system；16 be to put
Pressure valve；17 be high pressure valve.
Embodiment
The utility model discloses liquid CO2Pressure break low-pressure manifold device, can both solve low pressure feed flow flow, feed flow liquid level
During reduction, feed flow is unstable, easy the problem of tying dry ice, when can realize that empty pump occurs in higher-pressure region pressure break pump truck again, is continuously applying
In the case of work, realize that walking pump online recovers its construction ability, while pipeline can also be carried out safely and fast after construction terminates
Bleed off pressure.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
The liquid CO that the utility model embodiment provides2Pressure break low-pressure manifold device, its core improvement be, including according to
The CO of secondary connection2Tank car 1, the first liquid phase header 2, booster pump 3 and pressure break liquid-supplying system, for realizing that normal pressing crack construction is made
Industry, its structure are referred to shown in Fig. 1；
Also include liquid nitrogen tank car 9, the gas phase header 6 of liquid nitrogen pump vehicle 8 and first being sequentially connected, multiple CO2Tank car 1 is all connected with
In the first gas phase header 6.It is understood that connection mentioned here is by pipeline and corresponding liquid phase valve 5 or gas valve
7。
It can be seen from the above technical scheme that the liquid CO that the utility model embodiment provides2Pressure break low-pressure manifold fills
Put, in pressing crack construction process, opening and CO2All gas valves 7 on gas phase pipeline that tank car 1 is connected, pass through liquid nitrogen pump vehicle 8
Can be according to needing at any time to every CO2Tank car 1 supplements N2, CO is kept with this2Pressure stability in tank car 1 is in preset range (root
Determined according to actual conditions, can be specially 290~350PSI herein) in, it ensure that CO2Tank car 1 whole work progress (including
Later stage liquid level reduce when) in steady feed flow, avoid CO2The generation of knot dry ice in tank car 1 and pipeline.
Preferably, pressure break liquid-supplying system includes more pressure break pump trucks 10；The entrance of every pressure break pump truck 10 is all connected to
The outlet of first gas phase header 6；The outlet of pressure break pump truck 10 includes two-way, therein to be connected with pressure release valve 16, another way all the way
It is connected with high pressure valve 17.Its structure is referred to shown in Fig. 1, connects threeway on every high pressure discharge line of pressure break pump truck 10, and one
Road connects high pressure header, connects relief line all the way, high pressure valve is connected on pipeline.
It is arranged such, in work progress, during such as pressure break pump truck sky pump, under continuously construction operating mode, closes the pressure break pump truck
10, maintain to continue to construct by other pressure break pump trucks 10, simultaneously close off the liquid phase valve 5 split in sky pump pressure on the suction line of pump truck 10
With the high pressure valve 17 of outlet, gas valve 7 corresponding to opening and pressure release valve 16, N is used by liquid nitrogen pump vehicle 82Replace the clean sky pump
After medium in pressure break pump truck 10, gas valve 7 corresponding to closing, liquid phase valve 5 corresponding to opening, make to be full of in the pressure break pump truck 10
CO2Liquid or CO2Load fluid medium, pressure release valve 16 corresponding to closing, the pressure break pump truck 10 is opened, opens the pressure break pump truck 10
High pressure valve 17, this pressure break pump truck 10 is recovered construction, ensure that the continuity entirely constructed, improve making for pressure break pump truck 10
Use efficiency.
In order to further optimize above-mentioned technical scheme, pressure break liquid-supplying system includes：Add sand liquid-supplying system 14 and pure liquid phase
Liquid-supplying system 15, structure is referred to shown in Fig. 1；
Wherein, sand liquid-supplying system 14 is added to include closed fracturing blender truck 4, the second liquid phase header 11 and for adding sand being sequentially connected
Pressure break pump truck 10, the outlet of booster pump 3 connects the import of closed fracturing blender truck 4 all the way；
Pure liquid phase liquid-supplying system 15 includes the 3rd liquid phase header 12 being sequentially connected and the pressure break pump truck 10 for pure liquid phase,
The outlet another way of booster pump 3 connects the import of the 3rd liquid phase header 12.So, in work progress, sand feed flow system is added
When the somewhere of 14 or pure liquid phase liquid-supplying system 15 appearance thorn of uniting leaks, the system for occurring piercing leakage is closed, rectification recovery is carried out, during which by another
System continues to construct all the way, ensure that being normally carried out for construction.
In the specific embodiment that this programme provides, in order to ensure to add sand concentration and add sand scale, more can be connected in parallel
Closed fracturing blender truck 4.Similar, in order to ensure operational discharge capacity, more booster pumps 3 can be connected in parallel.
This programme is described further with reference to specific embodiment：
A kind of liquid CO2Pressure break low-pressure manifold device, including CO2Tank car 1, each CO2The outlet of the bottom of tank car 1 passes through pipe
Line and liquid phase valve 5 connect the import of the first liquid phase header 2, and the outlet of the first liquid phase header 2 is increased by pipeline and the connection of liquid phase valve 5
The import of press pump 3, booster pump 3 export the import for connecting closed fracturing blender truck 4 by pipeline and liquid phase valve 5 all the way, closed fracturing blender truck 4
Outlet the import of second liquid phase header 11 is connected by pipeline and liquid phase valve 5, second liquid phase header 11 is provided with multiple outlets, divided
Not Lian Jie pressure break pump truck 10, wherein closed fracturing blender truck 4 to pressure break pump truck 10 connection system form plus sand liquid-supplying system 14；Supercharging
The another way that pump 3 exports connects the import of the 3rd liquid phase header 12, and the 3rd liquid phase header 12 is provided with multiple outlets, respectively connection pressure
Pump truck is split, wherein the connection system of the 3rd liquid phase header 12 to pressure break pump truck forms pure liquid phase liquid-supplying system 15.Liquid nitrogen tank car 9
The import of outlet connection liquid nitrogen pump vehicle 8, the outlet of liquid nitrogen pump vehicle 8 connect the first gas phase header 6 by connecting pipeline and gas valve 7
Import, the first gas phase header 6 sets multiple outlets, and section port connects each CO by connecting pipeline and gas valve 7 respectively2Tank
The top inlet of car 1, part outlet connect the import of the second gas phase header 13, the second gas phase by connecting pipeline and gas valve 7
The outlet of header 13 is connected on the suction line of every pressure break pump truck 10 by connecting pipeline and gas valve 7 respectively, gas phase header 6
One outlet the top inlet of closed fracturing blender truck 4 is connected by connecting pipeline and gas valve 7.
During site operation, its operating process is as follows：
(1) prepare before pressure：Keep all high and low pressure pipelines, elbow, various valve members, the cleaning of inside oily nonyl and joint,
It is intact；Pressure break pump truck 10 carries out clack box cleaning water removal, seal is debugged before carrying out inspection replacing, lubricating system pressure；CO2Tank
The quantity of car 1 meets the requirement of detail design liquid measure and its internal pressure ensures in 290~350PSI before construction.
(2) low-pressure line connects, and is attached according to low-pressure line described in the utility model connection flow.
(3) low-pressure line pressure testing：Opening and CO2Tank car 1 is connected all gas valves 7 on pipeline, by with the first gas
Air-tightness pressure testing is carried out after the connection balance of phase header 6.
(4) low-pressure line balance and pipeline purging：All liquid phase valves 5 are closed, open CO2Own between tank car 1 and liquid nitrogen pump vehicle 8
Gas valve 7, N is provided by liquid nitrogen pump vehicle 82Balance all CO2The pressure of tank car 1, open CO2The side that gas-liquid is connected on tank car 1
Port valve, from CO2Tank car 1 starts to pressure break pump truck 10, the gas valve 7 on pipeline is opened successively, from CO2The outlet of tank car 1 starts pipeline purging
Until well head, cleans up not residual solids particle, and be full of N by pipeline2And cold true pipeline, the outlet pressure of adjustment liquid nitrogen pump 8
Power, all pipelines are made to be maintained at more than 75.9PSI pressure, to avoid occurring dry ice in work progress in pipeline.
(5) pump is walked：Close CO2Gas by-passing valve on tank car 1, all gas valves 7, all liquid phase valves 5 are opened, start to press
Split pump truck 10 (one grade of locking) and enter traveling pump, make to be full of liquid CO in whole liquid phase pipeline2, if full of by controlling fracturing pump
The circulating valve of car and standby circulating valve judge the topping up situation of fluid end, judge that pump truck is walked according further to the frosting situation of fluid end
The quality of pump, fluid end need each cylinder body frosting.
Further, what pressure break pump truck 10 can be one by one walks pump, can also more pressure break pump trucks 10 walk pump simultaneously.
(6) pressing crack construction：Pressing crack construction, in work progress, CO are carried out by operational procedure2Tank car 1 arrives gas between liquid nitrogen pump 8
Gas valve 7 on phase pipeline is open mode, and CO can be given at any time by liquid nitrogen pump 82Tank car 1 supplements N2, CO is kept with this2
Pressure stability in tank car 1 ensure that CO in 290~350PSI2The steady feed flow in whole work progress of tank car 1, is avoided
CO2The generation of knot dry ice in tank car 1 and pipeline.
(7) in work progress, such as there are abnormal conditions, operating process is as follows：
S1：When there is pressure break pump truck sky pump, under continuously construction operating mode, the pressure break pump truck 10 is closed, by other fracturing pumps
Car 10 maintains to continue to construct, and simultaneously closes off and the liquid phase valve 5 on the suction line of pressure break pump truck 10, closing and the pressure break pump truck 10
The high pressure valve 17 of outlet, gas valve 7 corresponding to opening and corresponding pressure release valve 16, use N2Replace in the clean pressure break pump truck 10
Medium；Gas valve 7 corresponding to closing, liquid phase valve 5 corresponding to opening, make to be full of CO in the pressure break pump truck 102Liquid or CO2Take sand
Liquid medium, pressure release valve 16 corresponding to closing, the pressure break pump truck 10 is opened, open the high pressure valve 17 of the pressure break pump truck 10, make this
Pressure break pump truck recovers construction, ensure that the continuity entirely constructed, improves the service efficiency of pressure break pump truck 10.
S2：Add sand liquid-supplying system 14 or the pure somewhere of liquid phase liquid-supplying system 15 thorn leakage occur, close the system for thorn leakage occur, enter
Row rectification recovers, and during which continues to construct by another way system, ensure that being normally carried out for construction.
(8) construct the later stage：Head valve is closed, the gas valve 7 being connected with liquid nitrogen pump 8 is opened, turns off CO2Tank car 1
On liquid phase valve 5, open CO2The by-passing valve and connected gas valve 7 that gas-liquid on tank car 1 is connected, open pressure break
Pressure release valve 16 on pump truck 10, from CO2The outlet line of tank car 1 starts to use N2The progressively liquid phase CO in displacement pipeline2, displacement process
Pressure in middle guarantee pipeline is more than 75.9PSI；Treat to be full of N in all pipelines2Afterwards, the gas valve 7 closed on liquid nitrogen pump 8 stops
N is provided2, bleed off pressure to zero, construction terminates, safety and speed is fast, the occurrence of preventing from tying dry ice.
In summary, the utility model embodiment provides a kind of liquid CO2Pressure break low-pressure manifold device, including CO2Tank
Car, liquid phase header, booster pump, closed fracturing blender truck, liquid phase valve, gas phase header, gas valve, liquid nitrogen pump vehicle, liquid nitrogen tank car, fracturing pump
Car, pressure release valve and high pressure valve.Wherein, CO2Tank car, liquid phase header, booster pump, closed fracturing blender truck, pressure break pump truck by pipeline and
Liquid phase valve is sequentially connected composition liquid phase pipeline, and liquid phase pipeline is divided into two-way, and pipeline provides load fluid for pressure break pump truck and adds sand all the way,
Pipeline provides pure liquid phase for pressure break pump truck all the way, and independently of each other, can effectively coordinate the emergency situations such as processing pipeline thorn leakage.
CO2Tank car, liquid nitrogen pump vehicle, liquid nitrogen tank car, gas phase header, pressure break pump truck pipe are sequentially connected composition gas phase by pipeline and gas valve
Pipeline, gas phase pipeline can be according to situations at any time to liquid phase pipeline, CO2Tank car, pressure break pump truck provide N2, ensure that whole construction
Process field device and pipeline internal pressure and construction later stage feed flow are stable, avoid finishing the possibility of dry ice；Simultaneously when certain pressure
When splitting the pump truck empty pump situation of appearance, CO can be controlled by switching corresponding gas valve, liquid phase valve, pressure release valve and high pressure valve2Liquid
And N2Supply, realize and walk pump online, finally recover its construction ability, effectively solve certain pressure break pump truck and empty pump situation occur
When, the problem constructed can be continued；N can also be used rapidly after construction terminates2Replace in all pipelines in clean ground and equipment
CO2, then carry out bleeding off pressure processing, it is safe and quick.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments in the case where not departing from spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (5)
- A kind of 1. liquid CO2Pressure break low-pressure manifold device, it is characterised in that including the CO being sequentially connected2Tank car (1), the first liquid phase Header (2), booster pump (3) and pressure break liquid-supplying system；Also include liquid nitrogen tank car (9), liquid nitrogen pump vehicle (8) and the first gas phase header (6) being sequentially connected, multiple CO2Tank car (1) it is all connected to the first gas phase header (6).
- 2. liquid CO according to claim 12Pressure break low-pressure manifold device, it is characterised in that the pressure break liquid-supplying system bag Include more pressure break pump trucks (10)；The entrance of every pressure break pump truck (10) is all connected to going out for the first gas phase header (6) Mouthful；The outlet of the pressure break pump truck (10) is connected with pressure release valve (16) all the way, and another way is connected with high pressure valve (17).
- 3. liquid CO according to claim 12Pressure break low-pressure manifold device, it is characterised in that the pressure break liquid-supplying system bag Include：Add sand liquid-supplying system (14) and pure liquid phase liquid-supplying system (15)；Closed fracturing blender truck (4) that described plus sand liquid-supplying system (14) includes being sequentially connected, second liquid phase header (11) and plus sand Pressure break pump truck (10), the outlet of the booster pump (3) connect the import of the closed fracturing blender truck (4) all the way；The pure liquid phase liquid-supplying system (15) includes the pressure break pump truck for the 3rd liquid phase header (12) and the pure liquid phase being sequentially connected (10), the outlet another way of the booster pump (3) connects the import of the 3rd liquid phase header (12).
- 4. liquid CO according to claim 12Pressure break low-pressure manifold device, it is characterised in that in the pressure break liquid-supplying system Closed fracturing blender truck (4) be to be connected in parallel more.
- 5. liquid CO according to claim 12Pressure break low-pressure manifold device, it is characterised in that the booster pump (3) is simultaneously More of connection connection.
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| CN201721009968.6U CN207111064U (en) | 2017-08-11 | 2017-08-11 | A kind of liquid CO2Pressure break low-pressure manifold device |
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| CN201721009968.6U CN207111064U (en) | 2017-08-11 | 2017-08-11 | A kind of liquid CO2Pressure break low-pressure manifold device |
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| CN110284863B (en) * | 2019-06-25 | 2021-06-22 | 中石化四机石油机械有限公司 | Simulated CO2Dry fracturing working medium mixed transportation experimental device and experimental method |
| CN112901133A (en) * | 2019-12-04 | 2021-06-04 | 中国石油天然气股份有限公司 | Liquid supply device |
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| CN111894542B (en) * | 2020-06-24 | 2021-07-02 | 中国矿业大学 | Low-temperature fluid reinforced injection ice blocking fracturing method for horizontal well |
| CN111894542A (en) * | 2020-06-24 | 2020-11-06 | 中国矿业大学 | Low-temperature fluid reinforced injection ice blocking fracturing method for horizontal well |
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| CN114233260A (en) * | 2021-12-21 | 2022-03-25 | 中石化石油工程技术服务有限公司 | Shale gas fracturing double-pump-in low-pressure liquid supply device |
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Effective date of registration: 20180730 Address after: 100028 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Co-patentee after: Down-hole job that requires special skills company of Central Plains petroleum works Co., Ltd of China Petrochemical Industry Patentee after: SINOPEC OILFIELD SERVICE CORPORATION Co-patentee after: SINOPEC ZHONGYUAN PETROLEUM ENGINEERING CO., LTD. Address before: 100028 Chaoyang District, Beijing Hui Xin Street 6, Twelfth level. Co-patentee before: Down-hole job that requires special skills company of Central Plains petroleum works Co., Ltd of China Petrochemical Industry Patentee before: SINOPEC OILFIELD SERVICE CORPORATION |
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