Allocation method and device for liquid production capacity of steam flooding edge-corner well

Abstract

The invention discloses an allocation method and device for liquid production capacity of a steam flooding edge-corner well. The method includes the following steps that the daily liquid production capacity of a single well set is determined according to the daily steam injection amount of the single well set, and the basic daily liquid production capacities of an edge well and a corner well in the edge-corner well are calculated based on the effective area and the reservoir thickness; the flow-field demarcation line position proportion is determined, and the corner-well basic liquid production capacity correction coefficient is determined based on the reservoir thickness of the edge and corner wells and the flow-field demarcation line position proportion; the edge-well basic liquid production capacity correction coefficient is determined based on the corresponding relationship between the corner-well basic liquid production capacity correction coefficient and the edge-well basic liquid production capacity correction coefficient; based on the corner-well basic liquid production capacity correction coefficient and the edge-well basic liquid production capacity correction coefficient, the daily liquid production capacity of productions wells of a multi-well set is allocated. According to the method and the device, the displacement uniformity can be improved, steam channeling is avoided as far as possible, and thereby it is ensured that steam flooding obtains the maximum sweep area and the highest recovery efficiency.

Description

technical field [0001] The invention relates to the technical field of heavy oil reservoir development, in particular to a method and a device for configuring liquid production rate of steam flooding corner wells. Background technique [0002] Steam flooding is a major thermal oil recovery method for developing heavy oil reservoirs internationally. When steam flooding is used for oil recovery, it is necessary to arrange injection and production systems in heavy oil reservoirs for steam injection production. Among them, the reverse nine-point well pattern is a commonly used injection-production system. Such as figure 1 As shown, the reverse nine-point well pattern is a well pattern arranged according to a square well pattern, with the steam injection well as the central well and 8 production wells around it. The wells at the midpoint of the four sides of the square are called side wells, which are at the four corners The wells are called corner wells. [0003] In the anti...

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Problems solved by technology

[0003] In the anti-nine-point well pattern, there are two situations that are likely to reduce the steam sweeping area, the sweeping efficiency, and the recovery factor

[0004] One is: Even if steam flooding is carried out in a well-homogeneous reservoir, objectively, the distance between the side well and the corner well and the central steam injection well is different, and the time for the steam front to reach the side well and the corner well will be different, which may easily lead to When the steam front reaches the side well, there are still some areas in the corner well that have not been swept by steam, the steam sweeping efficiency is reduced, and the steam sweeping area is incomplete, thereby reducing the recovery factor

[0005] The second is: in the steam development in poor homogeneity reservoirs, if the daily liquid production of a certain production well is too large, most of the injected steam will be driven to this well, so that other production wells will not be affected by steam. Effective displacement, resulting in unbalanced steam sweep, greatly reducing the steam sweep area and efficiency, thereby reducing the recovery factor

[0006] In the past, there were the following problems when configuring the fluid production rate of steam flooding production wells: first, there was only a method for configuring the fluid production rate of the well group, and there was no scientific allocation method for the fluid production rate of a single well; second, when configuring the fluid production rate of a single well , only based on the subjectivity and simply configure the liquid production rate according to the oil layer thickness ratio of a single well, without taking into account the difference in the position of the side well and the corner well

Due to the existence of these problems, the liquid production volume allocation of production wells lacks scientificity and rigor, which leads to the reduction of steam sweep efficiency and sweep area, which ultimately affects the recovery factor.

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