Method for predicting well yield of sealed, unsaturated oil reservoirs through elastic driving water-flooding extraction

Abstract

The invention discloses a method for predicting the well yield of sealed, unsaturated oil reservoirs through elastic driving water-flooding extraction. The method includes: measuring the initial volume coefficient Boi of crude oil and the volume coefficient Bo of the crude oil under different pressure conditions, measuring the initial oil saturation Soi and the initial water saturation Swc of the rock core, generally measuring the in-place oil compression coefficient Co, the formation water compression coefficient Cw and the rock compression coefficient Cp, obtaining the rock effective compression coefficient Ceff according to the above parameters; measuring the oil geological reserves N and the reservoir pressure under a certain injection condition according to a matter balance equation, and finally measuring the yield of an oil well according to a plane radial flow Darcy equation, wherein the yield includes oil yield and water yield. The method supplements the correspondence between injected water and oil reservoir pressure change under the water-flooding extraction condition, accordingly can predict the daily oil yield and the daily water yield under the water-flooding extraction condition, and provides reference value for oil field production cost.

Description

technical field [0001] The invention belongs to the field of oil reservoir engineering technology and a method for predicting the output of oil wells under the condition of artificial water injection development, which belongs to the post-conversion development technology of natural energy development of closed and unsaturated oil reservoirs, that is, the method for predicting the output of oil wells in closed and unsaturated oil reservoirs elastically driven by water injection . Background technique [0002] The main professional concepts involved in this technical field are as follows: [0003] 1. Closed oil reservoir: Refers to the oil reservoir connected by no water body. It mainly refers to some lithological trap reservoirs or reservoirs with weak edge and bottom water that have little influence on reservoir development. weak. [0004] 2. Unsaturated reservoir: refers to the reservoir not saturated by gas. Its main feature is that the formation pressure of the reser...

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Problems solved by technology

In the previous reservoir engineering research, the impact of continuous production on reservoir pressure and water cut was mainly considered during the reservoir development process, but there were few quantitative descriptions of oil well production under the condition of artificial water injection in the later stage of reservoir development , therefore, it is difficult to predict the production of oil wells under this condition, which cannot make a reasonable prediction of the production cost, which is not conducive to the production in the later stage

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