Offshore oilfield water injection well dual-channel flow control system and method
A flow control, offshore oilfield technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc.
Active Publication Date: 2020-07-24
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
[0004] The main purpose of the present invention is to overcome the above-mentioned shortcomings of the existing products, and provide a dual-channel flow control system and method for offshore oilfield water injection wells, which solves the problem of automatic flow control under the demand of large test ranges in offshore oilfields. Passive measurement and adjustment is changed to active automatic measurement and adjustment, which is suitable for layered water injection testing and deployment in large test ranges of offshore oilfields
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[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.
[0033] like figure 1 , figure 2 , Figure 3A , Figure 3B As shown, the double-channel flow control system for water injection wells in offshore oilfields of the present invention includes a ground comprehensive diagnosis and analysis controller 1, a signal cable 3, a cable positioning seal 4, several cable insertion seals and several double measurement and control channel water distributors; The lower end of the first-level cable insertion seal is connected to the upper end of the first-level dual-measurement and control channel water distributor 11 located in the first water injection layer section 12; the upper end of the first-level cable insertion seal 10 is connected to the upper end of the second water injection layer section 9 The lower end of the second-stage dual m...
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The invention discloses an offshore oilfield water injection well dual-channel flow control system and method. The lower end of a first-stage cable passing inserting seal is connected with an upper end of a first-stage dual measure and control channel water distributor located on a first water injection interval, the upper end of the first-stage cable passing inserting seal is connected with the lower end of a second-stage dual measure and control channel water distributor located on a second water injection interval, the upper end of the second-stage dual measure and control channel water distributor is connected with the lower end of a second cable passing inserting seal, the upper end of the second-stage cable passing inserting seal is connected with the lower end of a third-stage dualmeasure and control channel water distributor through a third water injection interval, the upper end of the third-stage dual measure and control channel water distributor is connected with the lowerend of a cable passing positioning seal, the upper end of the cable passing positioning seal is connected with an oil pipe at the upper end of a water injection string, a ground comprehensive diagnostic analysis control instrument is in series connection with the third-stage dual measure and control channel water distributor, the second-stage dual measure and control channel water distributor andthe first-stage dual measure and control channel water distributor through signal cables, the water injection well large-test-range dual-channel flow control system is formed, and a water injection well can automatically measure and adjust the layering flow.
Description
technical field [0001] The invention relates to a dual-channel flow control system and method for water injection wells in offshore oil fields. Background technique [0002] Oilfield water injection development is one of the main development methods of many oilfields. Compared with land oilfields, the single well injection volume of water injection wells in offshore oilfields is large, but due to the prominent contradictions between layers in offshore oilfields, the problem of uneven injection volume in each layer is very obvious. Taking the Bohai Oilfield as an example, the single-day injection volume of a layer with better water absorption capacity in an injection well can be as high as thousands of cubic meters, while the single-day injection rate of layers with poor water absorption capacity can be as low as tens of cubic meters. At present, the water distributors commonly used in the oil and gas field are mainly divided into traditional fishing water distributors, wate...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21B43/01E21B43/20E21B43/14E21B34/06
CPCE21B43/01E21B43/20E21B43/14E21B34/06
Inventor 刘义刚孟祥海陈征张志熊张乐邹剑蓝飞宋鑫张凤辉徐兴安
Owner CHINA NAT OFFSHORE OIL CORP