Deployment method of offshore oilfield well pattern on basis of equilibrium displacement

Abstract

The invention discloses a deployment method of an offshore oilfield well pattern on the basis of equilibrium displacement. The deployment method comprises the following steps that 1, the reservoir displacement effect is maximized, and as for anisotropic medium reservoirs, the well distances in a certain direction can be adjusted according to the characteristic of the permeability to achieve the purpose of equilibrium displacement of an injected fluid; 2, adaptability of sand body distribution and the well pattern is determined; and 3, the well control reserve volume and injection-to-productionwell ratio are determined. According to the deployment method, the recovery efficiency of the reservoirs under different development scheme deployment is established, and the problem of oilfield wellpattern development is solved; and in addition, the technical support is provided for offshore complex river-phase oilfields to achieve equilibrium displacement and well pattern one-time forming, andthe problem that due to limitation of the platform space and the service life, the oilfield well pattern later-period adjusting is difficult is solved.

Description

technical field [0001] The present invention relates to offshore oilfields, in particular to a method for deploying well patterns in offshore oilfields based on balanced displacement. It belongs to the field of exploration and development of oil and gas fields. Background technique [0002] my country's offshore fluvial oilfields are rich in reserves. Under the background of the declining trend of land oilfields, the continuous and efficient development of offshore fluvial oilfields is an important part of oil production growth and production replacement, and the rational deployment of development well patterns is a prerequisite for efficient development. [0003] At present, rolling development technology is adopted in onshore oilfields, that is, the basic well pattern or pre-test wells are deployed in the initial stage, and post-drilling understanding and comprehensive geological reservoir research are carried out on this basis, followed by infilling to form the final well...

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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and to provide a deployment method based on balanced displacement offshore oilfield well pattern, which not only establishes the recovery rate under the deployment of different development schemes of the oil reservoir, but also solves the problem of oil field The problem of well pattern deployment; moreover, it also provides technical support for the realization of balanced displacement and one-time formation of well pattern in offshore complex fluvial oilfields, and solves the problem of difficult adjustment of oilfield well pattern in the later stage due to the limitation of platform space and life

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