Air foam slug flow driving process for oil recovery of oil field

Abstract

The invention discloses an air foam slug flow driving process for the oil recovery of an oil field, comprising the following steps of: 1 determining type and proportion of the used foam liquid, slug volume ratio and on-site injection manner of the used air and the foam liquid during the air foam slug flow driving by an indoor test; and 2 carrying out the air foam liquid slug flow driving on site,wherein the oil flow driving process comprises the following steps of: preparation before the oil flow driving; slugging a pad fluid; slugging the air foam; alternatively injecting the air and foam liquid slug from a specially manufactured device to a target well for many times; and continuously carrying out the oil flow driving on the target well by a water or air injection method according to the dynamic change condition of the target well and a conventional oil displacement method after the injection of the air foam slug is finished. The invention has the advantages of reasonable design, simple and convenient construction steps, good use effect and convenience of realizing, can effectively solve various practical problems of poor water injection effect, difficult improvement on the water injection capability, poor oil flow driving efficiency and the like during the ultralow reservoir waterflooding.

Description

technical field [0001] The invention relates to an oil displacement process for oil recovery in an oil field, in particular to an air foam slug displacement process for oil recovery in an oil field. Background technique [0002] Ganguyi Oilfield is a typical lithologic reservoir with low porosity, ultra-low permeability and low productivity. For a long time, how to increase the production of oil wells and improve the oil recovery rate of oil fields has always been the main issue faced by oil field development. Due to the extremely poor nature of reservoirs, natural energy depletion exploitation has always been the main development method of oilfields. However, with the depletion of formation energy, this development method is not only difficult to ensure the stability of single well production, but also difficult to increase the oil recovery rate of the oil field. Acute contradictions such as water channeling and serious flooding make it difficult to improve the utilizatio...

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Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide an air foam slug flooding process for oil field oil recovery, which is reasonable in design, simple in construction steps, convenient in implementation and good in use effect, and can effectively solve the problems in the above-mentioned prior art. In the process of water flooding in low permeability reservoirs, there are many practical problems such as poor water injection effect, difficulty in improving water injection capacity, and low oil displacement efficiency.

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