摘要
由于启动压力梯度和应力敏感效应的存在,油藏流体的渗流过程不再符合经典的达西渗流理论,流体的流动阻力加大,使油井的产能降低。通过建立启动压力、应力敏感效应存在下的产能方程,分析启动压力、应力敏感效应以及启动压力梯度和应力敏感效应同时作用时的油井采油指数变化,研究启动压力梯度和应力敏感效应对油井产能的影响。结果表明:启动压力梯度存在时,油井采油指数随生产压差的增大而增大;应力敏感效应存在时,油井采油指数随生产压差的增大而减小;启动压力梯度和应力敏感效应同时存在,可以通过调节生产压差来提高油井的产量。
Due to the existences of the starting pressure gradient and stress sensitive effect,the seepage process of the reservoir fluid no longer conforms to the classical Darcy percolating theory and the fluid flow resistance is increased,so the productivity of the oil well is lowered. Therefore,with the help of the established productivity formula in the consideration of the starting pressure gradient and the stress sensitive effect,the changes of the oil well productivity index（ PI） were analyzed under the actions of the pressure gradient,the stress sensitive effect and the simultaneous actions of the two stated above,and moreover the influences of the gradient and effect on the productivity were figured out. The achievements show that in the presence of the start-up pressure gradient,with the rise of the production pressure difference,the PI is increased as well; while when there exists the stress sensitive effects,with the rise of the production pressure difference,the PI is decreased; for the presentations of the both,by means of adjusting the production pressure difference,the oil well production can be enhanced.
作者
祝明谦
王怒涛
张辉
ZHU Mingqian;WANG Nutao;ZHANG Hui(Oil and Gas Engineering Institute of Southwest Petroleum University, Chengdu 610500, China;Zhanjiang Branch of China National Petroleum Co Ltd. , Zhanjiang 524057, China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2018年第3期59-63,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项"乌石凹陷低渗敏感性储层渗流机理及改善水驱动效果评价研究"(2016ZX05024-006-005)
关键词
启动压力梯度
应力敏感
采油指数
油井产能
start-up/starting pressure gradient
stress sensibility
oil productivity index （PI） /factor
oil well productivity
作者简介
祝明谦，男，1994年生，在读硕士，从事油气藏工程和油气井的试井技术研究。E—mail：：zmq646004299@163．com
