Method for determining productivity of new wells in old area of offshore oilfield based on multiple factors

Abstract

The invention provides a method for determining the productivity of new wells in an old area of an offshore oilfield based on multiple factors. The method includes the steps that the new well production effective thickness is designed; according to the residual oil saturation and the water content in production of corresponding layers of adjacent old wells in combination with the relation between the water content in the initial stage of production of new wells of an adjusted block and the water content of the surrounding old wells with similar oil reservoir conditions, the water content in the initial stage of production of the new wells of the block is determined; according to oil reservoir oil-water phase permeability data, the changing curve of the non-dimensional oil production index along with the water content is calculated, and the oil production index under the water content is calculated; the initial-stage production pressure difference of the new wells is determined; the theoretical daily oil productivity of the new wells is calculated; the relation between the actual yield and the theoretical calculated yield is summarized to determine the actual daily oil productivity in production of the new wells of the block. By means of the method for determining the productivity of the new wells in the old area of the offshore oilfield based on multiple factors, the purpose of improving the accuracy of prediction of the productivity of the new wells in the old area of the offshore oilfield is achieved, and meanwhile a basis is provided for offshore productivity planning and smooth new well drilling.

Description

technical field [0001] The invention relates to the field of determining the production capacity of new wells adjusted in high water-cut periods in offshore oil fields, in particular to a method for determining the production capacity of new wells in old areas of offshore oil fields based on multiple factors. Background technique [0002] The commissioning cost of new wells in offshore oilfields is generally 30-40 million yuan. Such an expensive and high-risk investment determines that new wells must have a certain production capacity in order to have economic benefits. For the comprehensive adjustment of offshore oilfields, productivity prediction is a key issue before new well drilling and production. The scientificity and accuracy of productivity prediction not only affects whether the new well can be successfully drilled, but also affects the economic indicators of the well. At present, new well productivity prediction is based on oil production intensity or experience t...

AI Technical Summary

Problems solved by technology

At present, the productivity prediction of new wells is based on the oil production intensity or experience to predict the productivity of new wells. The method is simple, but due to the influence of dynamic development of reservoirs, there are large uncertainties and errors.

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