应力敏感实验评价结果与开发特征矛盾分析

发布时间：2018-05-26 12:12

本文选题：低渗透油藏 + 应力敏感性　；参考：《大庆石油地质与开发》2016年06期

【摘要】：由于储层具有较强的压力敏感性,很多深层复杂低渗透油藏的生产过程中,存在产量递减速度快、注不进采不出等问题。许多油田通过储层压力敏感性评价实验,评价结果为弱压力敏感或无压力敏感,但在实际开发过程中体现出强压力敏感性特征,实验室压力敏感性评价结果偏离实际油藏真实情况。导致实验室所测压力敏感性比处于高压下的储层压力敏感性弱的主要原因:一是异常高压油藏储层渗透率压力敏感的时滞效应,另一点是开采过程中孔隙度和渗透率损失的不可逆性。为了准确评价储层应力的敏感性,实验室需使每个围压点保持相应的时间以保证测试的渗透率已稳定;实验所用岩心必须是在储层原始状况下取出的岩心;针对异常高压低渗透油藏,如果使用的是地层压力下降后的储层岩心,建议在使用相同裂缝密度且渗透率大20%~40%的岩心进行实验。
[Abstract]:Because the reservoir has strong pressure sensitivity, in the production process of many deep complex and low permeability reservoirs, there are some problems such as fast production decline speed, no injection and no production and so on. Through reservoir pressure sensitivity evaluation experiments, many oilfields show weak pressure sensitivity or no pressure sensitivity, but show strong pressure sensitivity in the actual development process. The results of laboratory pressure sensitivity evaluation deviate from the actual reservoir. The main reasons why the pressure sensitivity measured in the laboratory is weaker than that in the reservoirs under high pressure are as follows: first, the delay effect of permeability sensitivity in abnormal high pressure reservoirs. Another point is the irreversibility of porosity and permeability loss during mining. In order to accurately evaluate the sensitivity of reservoir stress, the laboratory should keep each confining pressure point for a certain time to ensure that the measured permeability is stable, and the core used in the experiment must be the core taken out under the original condition of the reservoir. For abnormal high pressure and low permeability reservoirs, if the reservoir core is used after the formation pressure is reduced, it is suggested that the core with the same fracture density and high permeability of 20% or 40% should be used for experiments.
【作者单位】：长江大学石油工程学院;
【基金】：Scientific Research and Technological Development Projects of China National Petroleum Corporation(2014B-1509)
【分类号】：TE348

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