Straight-line parallel flow water injection oil extraction method

Abstract

The invention relates to a linear parallel-flow water-injection oil excavating method, belonging to the gas field excavating method technical field. The method is characterized in that a plurality of horizontal production wells and a plurality of horizontal water-injection wells are obtained by drilling an oil layer which is suitable for injecting water and excavating with the horizontal wells; the production wells and the water-injection wells are respectively arranged at a certain interval in a row; an injecting well drainage and a production well drainage are alternately arranged and are parallel with each other; the water-injection well and the production well are either single pitshaft horizontal wells or horizontal branch wells; two branches of each horizontal branch well have certain horizontal section lengths and have opposite directions in the same vertical plane; and the horizontal section of each horizontal well is perforated from up to down and is fractured so as to generate an eyelet or a crack, the crude excavation is carried out through injecting water from the water-injection well to the oil layer. The linear parallel-flow water-injection oil excavating method is applied, the fingering phenomenon of the injected water can be improved, the utilization rate of the injected water is improved, the production of residual oil is reduced, recovery percent of the water-injection oil excavating for oil is improved, the waste of oil resource is reduced, and economic benefits for oil-field development is improved greatly.

Description

Straight-line Parallel Flow Water Injection Oil Recovery Method Technical field: The invention relates to a linear parallel flow water injection oil production method, which belongs to the technical field of oil and gas field production method design. Background technique: At present, oil water injection production usually adopts the radial flow production method. Regardless of whether it is a vertical well or a horizontal well, for the production well, the fluid flows into the wellbore in a radial seepage manner within a certain range near the wellbore. For water injection wells, the wellbore is the center, and the injected fluid flows to the surroundings in a radial flow manner. More than two-thirds of my country's crude oil extraction is exploited by artificial water injection, and all of them adopt vertical well water injection for vertical well oil production or vertical well water injection for horizontal well oil production. Artificial water injection development ...

AI Technical Summary

Problems solved by technology

The oil in these dead oil areas is buried in the ground in the form of remaining oil, so the recovery rate of oil water flooding is very low, usually only 30%-40% of the original geological reserves, resulting in a serious waste of oil resources

Images