Fine layered water injection method for ultra-low-permeability oil reservoir

Abstract

The invention discloses a fine layered water injection method for an ultra-low-permeability oil reservoir. The method comprises the following steps: S1, collecting geological data of a target area andanalyzing geological characteristics; S2, on the basis of the geological characteristics of the target area, analyzing difference characteristics of water injection extraction in the target area; andS3, on the basis of the difference characteristics of water injection extraction in the target area, carrying out refined layering on the target area to realize refined water injection and then adjusting a small layer water injection strategy in an optimized manner and allocating periods reasonably. To be specific, the process in the S3 is implemented as follows: carrying out fine comparison anddivision on reservoirs; dividing flow units in details; determining a dividing injection standard; determining small-layer injection extraction correspondences precisely; dividing injection extractionunits in details; and adjusting a small layer water injection strategy in an optimized manner and allocating periods reasonably. Therefore, on the basis of the practice and exploitation of key techniques like fine comparison and division on reservoirs, precise flow unit division, dividing injection standard determination, precise small-layer injection extraction correspondences determination, precise injection extraction unit division, and optimized adjustment of the small layer water injection strategy, a problem of the ultra-low-permeability oil reservoir exploitation is solved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir exploitation, in particular to a fine layered water injection method suitable for ultra-low permeability reservoirs. Background technique [0002] Low-permeability reservoirs are reservoirs with low matrix permeability. Low-permeability reservoirs are a relative concept. There is no uniform and fixed standard and boundary in the world. They are divided according to resource status and technical and economic conditions in different countries and periods Therefore, the parameters vary greatly. According to my country's production practice and theoretical research, according to the average permeability of oil layers, 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 geological characteristics such as low permeability,...

AI Technical Summary

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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