化学复合驱“二三结合”油藏产量计算方法  

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

作　　者：刘卫东 王高峰[1,2] 廖广志 王红庄[1,2] 王正茂 王强 王正波[1,2] LIU Weidong;WANG Gaofeng;LIAO Guangzhi;WANG Hongzhuang;WANG Zhengmao;WANG Qiang;WANG Zhengbo(State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;PetroChina Exploration&Production Company,Beijing 100007,China)

机构地区：[1]提高采收率国家重点实验室,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]中国石油勘探与生产分公司,北京100007

出　　处：《石油勘探与开发》2021年第6期1218-1223,共6页Petroleum Exploration and Development

基　　金：国家科技重大专项“化学驱提高采收率技术”(2016ZX05010)。

摘　　要：在剖析“二三结合”项目产量构成的基础上,提出了化学复合驱“二三结合”项目整体产量与空白水驱阶段产量的关系;根据“采收率等于波及系数乘以驱油效率”油藏工程原理,推导了化学复合驱油藏采收率计算公式;采用微分法对油藏进行剖分,建立了剖分网格采收率和油藏采出程度之间的联系,进而明确了化学复合驱油藏产量变化规律,定义了化学复合驱增产倍数,结合油田开发实际提出了化学复合驱“二三结合”油藏产量计算方法。研究表明:化学复合驱增产效果随化学复合驱和水驱驱油效率之比的升高而均匀升高,随转驱时采出程度和水驱油效率之比的增加而迅速增加,在高采出程度油藏实施化学复合驱更有利于提高增油效果。经实际二元驱试验检验,化学复合驱“二三结合”油藏产量计算方法预测结果相对误差约为±10%,预测精度满足油藏工程要求。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 proposed.According 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 established.By dividing the reservoir into a series of grids according to differential calculus thinking,the relationship between the ultimate recovery factor of a certain number of grids and the recovery degree of the reservoir was established,and then the variation law of oil production rate of the STRC reservoir was obtained.The 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 experience.The study shows that the oil production enhancing effect of STRC increases evenly with the increase 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 efficiency.STRC is more effective in increasing oil production of reservoir with high recovery degree.Through 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：化学复合驱 二三结合项目 驱油效率 化学驱增产倍数 产量计算 

分 类 号：TE328[石油与天然气工程—油气田开发工程]