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A fine layered water injection method for ultra-low permeability reservoirs

A technology of layered water injection and oil infiltration, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc. It can solve the problems of uneven longitudinal advancement of injected water, difficult adjustment, and low reservoir production. Alleviate the contradiction of heterogeneity, improve the effect of water flooding, and increase the effect of water flooding swept volume

Active Publication Date: 2019-04-30
NORTHWEST UNIV +2
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Problems solved by technology

After preliminary exploration and investigation, if one-time deployment, general development or combined injection and production are adopted, it will inevitably result in single-layer intrusion and tongue intrusion, resulting in uneven vertical advancement of injected water, low degree of reservoir production, and difficulty in later adjustment , low ultimate recovery

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  • A fine layered water injection method for ultra-low permeability reservoirs
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  • A fine layered water injection method for ultra-low permeability reservoirs

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Embodiment Construction

[0030] The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the text of the description.

[0031] Taking block A of an oil field as the research object, the ultra-low permeability oil reservoir fine layered water injection method of the present invention is used for water injection exploitation. Block A of Oilfield is located in a wide and gentle western slope developed in the western part of the northern Shaanbei slope in the Ordos Basin. The average structural slope is less than 1°, and the slope is 6.0-7.0m per kilometer. Aiming at the ultra-low permeability multi-layer complex lithological reservoir, the oil field A block has a large number of oil layers, large vertical span, fast horizontal change, interbedded sand and mudstone, complex oil-water relationship, developed fractures, complex water flooding front, water injection development In the process,...

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Abstract

The invention discloses a fine layered water injection method for ultra-low permeability oil reservoirs, which includes the following steps: S1. Collect geological data of the target area and analyze the geological characteristics; S2. Based on the geological characteristics of the target area, analyze the differences in water injection and mining in the target area. characteristics; S3. According to the differential characteristics of water injection mining in the target area, finely layer the target area to achieve fine water injection, and finally optimize and adjust the small layer water injection policy and rationally allocate the cycle. Step S3 includes the following steps in sequence: fine comparison and division of reservoirs, subdivision of flow units, determination of injection standards, fine correspondence between injection and production of small layers, subdivision of injection and production units, optimization and adjustment of small layer water injection policies and reasonable allocation cycles. Through the practice and exploration of key technologies such as fine division and comparison of reservoirs, subdividing flow units, establishing injection standards, fine small-layer injection and production correspondence, subdividing injection and production units, and optimization and adjustment of small-layer technical policies, the present invention effectively solves the problem of super-high pressure. Difficulties in the development of complex low-permeability reservoirs.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas reservoir exploitation, and particularly relates to a fine layered water injection method suitable for ultra-low permeability oil reservoirs. Background technique [0002] Low-permeability reservoirs are reservoirs with low matrix permeability. Low-permeability reservoirs are a relative concept. There are no uniform and fixed standards and boundaries in the world. They are classified according to the resource conditions and technical and economic conditions of different countries and different periods. Therefore, various parameters vary greatly. According to my country's production practice and theoretical research, and according to the average permeability of the oil layer, low permeability reservoirs are further divided into three categories: general low permeability reservoirs, ultra-low permeability reservoirs, and ultra-low permeability reservoirs. Ultra-low permeability reservoirs have geolo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 张卫刚陈刚郭龙飞付玉王铭伟陈德照李永宗胡瑞陈中伟李正伟韩禹吴勤博杨胜芝沈田丹
Owner NORTHWEST UNIV
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