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Method for optimizing water injection intensity after floodable reservoir oil well water breakthrough for deepwater turbidite sandstone

A technology of water injection strength and optimization method, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of high operation cost and difficult economical and effective implementation in deepwater oil fields, and achieves no operation cost and convenient operation cost. , the effect of simple operation

Active Publication Date: 2018-08-10
CNOOC TIANJIN BRANCH +1
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Problems solved by technology

Due to the high cost of deepwater operations and the limitation of engineering facilities, conventional measures such as profile control, water plugging, oil well injection, and liquid extraction are difficult to implement economically and effectively in deepwater oilfields

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  • Method for optimizing water injection intensity after floodable reservoir oil well water breakthrough for deepwater turbidite sandstone
  • Method for optimizing water injection intensity after floodable reservoir oil well water breakthrough for deepwater turbidite sandstone
  • Method for optimizing water injection intensity after floodable reservoir oil well water breakthrough for deepwater turbidite sandstone

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] The present invention proposes a method for optimizing water injection intensity after water breakthrough of oil wells in deep water turbidite sandstone water injection development reservoirs, comprising the following steps:

[0019] 1) Judging whether the target reservoir meets the application conditions of the optimization method: there are two application conditions, one is that the reservoir is developed by water injection and pressure preservation, and the other is that the water body multiple of the connected water body of the reservoir is less than 20. If the target reservoir satisfies the above two conditions simultaneously, then the optimization method described in the present invention is applicable to the target reservoir, and then the subsequent steps can be implemented; otherwise, if the target reservoir does not satisfy the above t...

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Abstract

The invention relates to a method for optimizing water injection intensity after floodable reservoir oil well water breakthrough for deepwater turbidite sandstone. The method comprises the following steps: 1) judging whether a target reservoir meets application conditions of the optimizing method or not, and performing follow-up steps if the target reservoir meets the application conditions; 2) performing sedimentary facies division on deepwater turbidite sandstone for dividing the deepwater turbidite sandstone into a water path storage layer and a leaf storage layer; 3) judging an injection-production communication mode, dividing the communication types among target injection-production well groups into a direct communication type, a lapping communication type and a compound communicationtype; 4) determining an optimizing moment for water injection intensity after oil well water breakthrough according to the injection-production communication mode of the injection-production well groups; and 5) applying different water injection intensity optimizing means according to the type of the storage layer: adopting an optimized water injection way with the core of improving longitudinalwaves for the water path storage layer, and adopting an optimized water injection way with the core of changing the liquid flow direction for the leaf storage layer.

Description

technical field [0001] The invention relates to a method for optimizing water injection strength after water breakthrough of oil wells in deep water turbidite sandstone water injection development reservoirs, belonging to the technical field of oil reservoir development. Background technique [0002] Deep water oil and gas reserves are extremely rich, and its exploration and development began in the late 1970s and has continued to heat up. At present, more than 60 countries in the world have carried out oil and gas exploration in deep water (water depth>300m), and the proven reserves are about 300×10 8 t, it is estimated that 40% of the world's total oil and gas reserves will come from deep water areas in the future. [0003] Since the 1990s, with the successive discovery of deepwater lowstand fan giant oil and gas fields in the Gulf of Mexico Basin in North America, the Campos Basin in South America, the Niger Delta in West Africa, and the South China Sea, deepwater tur...

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Application Information

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IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 苑志旺杨宝泉顾文欢陈筱张昕康博韬段瑞凯李晨曦杨希濮陈国宁张旭
Owner CNOOC TIANJIN BRANCH
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