基于两相启动压力梯度和应力敏感的油藏油井产能模型研究  

Study on Productivity Model of Oil Well in Low-permeability Reservoirs Based on Two-phase Threshold Pressure Gradient and Stress Sensitivity

作　　者：柴汝宽 刘月田[1] 王俊强 辛晶 CHAI Rukuan;LIU Yuetian;WANG Junqiang;XIN Jing(Key Laboratory of MOE for Petroleum Engineering,China University of Petroleum （Beijing） , Beijing 102249, China)

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《西安石油大学学报（自然科学版）》2018年第3期44-50,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金项目(5137422);国家重点基础研究发展计划(973计划)(2015CB250905);国家科技重大专项(2017ZX05032004-002)

摘　　要：低渗透油藏水驱开发过程中,储层中油水两相共同流动,油水两相启动压力梯度和储层应力敏感性同时存在。基于Buckley-Leverett方程,建立基于油水两相启动压力梯度和岩石本体有效应力理论为基础的应力敏感性的低渗透油藏油井产能模型,实例验证了该产能模型的准确性。与其他4个模型的预测结果比较表明:本文模型误差较小,能较好描述低渗透油藏油水两相渗流特征。说明低渗透油藏水驱开发过程中应该充分考虑油水两相启动压力梯度和应力敏感性的综合影响,研究结果可为低渗透油藏水驱开发提供理论支撑。In the water flooding development of low permeability reservoir, there are oil-water two-phase threshold pressure gradient and reservoir stress sensitivity- at the same time. Based on Buekley-Leverett equation, the productivity model of anoil well in low permeability reservoir was established,which is on the basis of the oil-water two-phase threshold pressure gradient and the stress sensitivity based on the rock body effective stress theory. The accuracy of the productivity model was verified by an example. Compared with the other four productivity models, the model has the smallest error, and can accurately describe the flow characteristics of oil-water two-phase flow in low permeability reservoir, which shows that in the development of low permeability reservoirs, it is necessary to take full consideration of the comprehensive influenee of the oil-water two-phase threshold pressure gradient and the reservoirstress sensitivity. The research provides theoretical support for the water-flooding development of low permeability reservoirs.

关 键 词：低渗透油藏 油井产能模型 油水两相启动压力梯度 应力敏感性 岩石本体有效应力 

分 类 号：TE328[石油与天然气工程—油气田开发工程]