Injection-production well group of fluvial facies sandstone reservoir and well spacing method of injection-production well group

Abstract

The invention discloses an injection-production well group of a fluvial facies sandstone reservoir and a well spacing method of the injection-production well group, and belongs to the technical field of oilfield development. The injection-production well group comprises a producing well and a water injection well, a permeable layer of the producing well and a permeable layer of the water injection well are both inclined bedding sandstone oil layers with fluvial facies deposition, the permeable layer of the producing well and the permeable layer of the water injection well belong to the same oil sand body, and the water injection well is located on the downstream portion of the producing well. According to the injection-production well group of the fluvial facies sandstone reservoir, based on the inclined bedding of fluvial facies sandstone, the water injection well is arranged on the downstream of the riverbed, the oil production well is arranged on the upstream of the riverbed, the pressure difference is generated at each layer series of the sandstone reservoir through the water injection pressure on the inclined bedding, the capillary binding force and the oil droplet buoyancy force; crude oil on the inclined bedding in the sandstone reservoir is excavated to the maximum extent, the water-oil displacement effect is improved, and therefore the crude oil recovery rate of the oil reservoir is increased.

Description

technical field [0001] The application relates to the technical field of oilfield development, in particular to an injection-production well group and a well arrangement method for fluvial sandstone reservoirs. Background technique [0002] In oilfield development, oil recovery methods that only rely on natural energy such as rock expansion, edge water drive, gravity, and natural gas expansion are called primary oil recovery. Generally, the recovery rate of crude oil in primary oil recovery is about 20%. The oil recovery method of reservoir pressure is called secondary oil recovery, and under normal circumstances, the oil recovery rate of secondary oil recovery can reach more than 50%. In secondary oil recovery, well layout is the key factor to improve the effect of water flooding. [0003] At present, different injection-production well group combinations are usually adopted according to the reservoir type. For structural oil and gas reservoirs, the injection-production c...

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Problems solved by technology

[0004] However, the above methods all determine the combination relationship of injection and production wells from the macroscopic physical position, without overall consideration from the microcosmic and sedimentary bedding. Therefore, the combination relationship of injection and production well groups determined by the above method is not comprehensive. Yes, the effect may not be as expected

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