A decision-making method for profile control and well selection suitable for offshore heavy oil reservoirs

Abstract

The invention relates to a profile control well selection decision-making method suitable for an offshore heavy oil reservoir. The profile control well selection decision-making method comprises the following steps that (1), single factor indexes in profile control well selection decision-making are divided according to index properties; (2), the numerical value of a comprehensive evaluation index of a water injection well to be evaluated is calculated; (3), the average value of comprehensive evaluation indexes of water injection wells of a block is calculated; and (4), the numerical value, obtained in the step (2), of the comprehensive evaluation index of the water injection well to be evaluated is compared with the average value, obtained in the step (3), of the comprehensive evaluation indexes of the water injection wells of the block so as to decide whether the water injection well to be evaluated needs to be subjected to a profile control measure or not. The method has the following advantages that (1), the influence of the viscosity of crude oil is fully considered in offshore heavy oil reservoir profile control well selection decision-making, so that the profile control well selection decision-making method is more accurate; and (2), all weight values are calculated through an analytic hierarchy process method, and the influence of human factors is removed, so that the profile control well selection decision-making method is more scientific and reasonable.

Description

technical field [0001] The invention relates to a profile control and well selection decision-making method suitable for offshore heavy oil reservoirs, belonging to the field of oil and gas field development. Background technique [0002] Profile control and water shutoff technology is a key technology for stabilizing oil and controlling water and improving water flooding efficiency in heterogeneous reservoirs. It plays an important role in improving the development effect of water flooding oilfields and increasing the ultimate recovery of oilfields. As offshore oilfield exploitation enters the middle and later stages, many oil wells will enter a high water cut stage, and the profile control and water shutoff technology will become more and more important. The success or failure of profile control measures largely depends on scientific and rational decision-making and optimization of profile control, including selection of profile control wells, optimization of construction ...

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Problems solved by technology

[0004] Although the above-mentioned decision-making technologies for profile control and well selection in onshore oilfield blocks have their own advantages, they are not suitable for offshore oilfields, especially for offshore heavy oil reservoirs, because heavy oil has high viscosity, high density, Therefore, for the decision-making of profile control and well selection in offshore heavy oil reservoirs, it is very necessary to use crude oil viscosity as a decision-making index for well selection, but none of the existing decision-making methods for profile control and well selection in blocks Viscosity parameters are listed among them, which greatly restricts the application of existing profile control and well selection decision-making technology in offshore heavy oil reservoirs

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