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Production calculation of the second and tertiary recovery combination reservoirs under chemical flooding

Petroleum Exploration and Development 2021年第6期48卷 1403-1410页

作者： LIU Weidong WANG Gaofeng LIAO Guangzhi WANG Hongzhuang WANG Zhengmao WANG Qiang WANG Zhengbo State Key Laboratory of Enhanced Oil recovery Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China PetroChina Exploration&Production Company Beijing 100007China

Based on the analysis of the production composition of reservoirs developed by the second&tertiary recovery combination(STRC),the relationship between the overall output of the STRC project and the production level during the blank water flooding stage is *** to the basic principle of reservoir engineering that the“recovery factor is equal to sweeping coefficient multiplied by oil displacement efficiency”,the formula for calculating the ultimate oil recovery factor of chemical combination flooding reservoir was *** dividing the reservoir into a series of grids according to differen-tial calculus thinking,the relationship between the ultimate recovery factor of a certain number of grids and the recovery de-gree of the reservoir was established,and then the variation law of oil production rate of the STRC reservoir was *** concept of“oil rate enlargement factor of chemical combination flooding”was defined,and a production calculation method of reservoir developed by STRC was put forward based on practical oilfield development *** study shows that the oil production enhancing effect of STRC increases evenly with the in crease of the ratio of STRC displacement efficiency to water displacement efficiency,and increases rapidly with the increase of the ratio of recovery degree at flooding mode conversion to the water displacement *** is more effective in increasing oil production of reservoir with high recovery *** practical tests of the alkali free binary flooding(polymer/surfactant)projects,the relative error of the oil production calculation method of STRC reservoir is about±10%,which meets the requirements of reservoir engineering.

关键词： chemical combination flooding second&tertiary recovery combination oil displacement efficiency oil rate en-largement factor of chemical flooding oil production calculation

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