可动水对储层应力敏感性影响的实验研究  

Experimental study on the influence of movable water on reservoir stress sensitivity

作　　者：杨国红 李秀清[1] 李明秋[1] 吴铮 朱讯[1] 邹娟[1] 李雪松[1] 丰妍 Yang Guohong;Li Xiuqing;Li Mingqiu;Wu Zheng;Zhu Xun;Zou Juan;Li Xuesong;Feng Yan(PetroChina Southwest Oil and Gasfield Company,Chengdu,Sichuan 610213,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油西南油气田分公司,四川成都610213 [2]西南石油大学,四川成都610500

出　　处：《特种油气藏》2021年第2期89-95,共7页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“超深层低渗气藏有效开发技术”(2016ZX05015-005)。

摘　　要：针对存在可动水条件下气水两相渗流测定时压力难以达到稳态、测试周期长的问题,提出了一种高温高压气水两相渗流条件下应力敏感性实验评价方法,通过引入电容法液体计量计控制岩心含水饱和度、蠕动泵调节气水循环流动获取应力敏感性数据,进而分析可动水对储层应力敏感性的影响,摆脱了单一调整入口端气水比例和回压阀联合控制的测试局限,丰富了气水两相渗流过程可动水控制技术。研究结果表明:可动水条件下的储层应力敏感性远强于干岩心和束缚水饱和度下的应力敏感性,随着岩心含水饱和度的不断增加,储层应力敏感性不断增强;岩心物性越好,可动水对应力敏感性的影响越小;建立了考虑应力敏感性的可动水条件下产能模型,发现储层含水饱和度越高,应力敏感性对气井产能的影响越大。研究结果对含水气藏渗流机理及产能评价具有重要的指导意义。In view of the problem that the pressure is difficult to reach a steady state and the test duration is long when measuring gas-water seepage under the condition of movable water,a experimental method for evaluating stress sensitivity under high temperature,high-pressure and gas-water seepage was proposed in this paper.Capacitance method was introduced to control core water saturation with liquid meter,adjust gas-water circulating flow with peristaltic pump to obtain stress sensitivity data,then the effect of movable water on reservoir stress sensitivity was analyzed.This method only breaks away from the restrictions on independent adjustment of gas-water proportion at the inlet and joint control with back pressure valve,but also provides more technologies for movable water control in gas-water seepage.The results showed that the stress sensitivity of reservoirs with movable water was much stronger than that of dry cores and reservoirs with irreducible water;with the continuous increase in core water saturation,the reservoir stress sensitivity continued to increase;the better the physical properties of the core,the smaller the effect of movable water on stress sensitivity;a productivity model under movable water conditions was established with consideration of stress sensitivity,and it was found that the higher the reservoir water saturation,the greater the effect of stress sensitivity on gas well productivity.The experimental study has an important guiding role in the seepage mechanism and productivity evaluation of water-bearing gas reservoirs.

关 键 词：可动水 致密气藏 应力敏感性 含水饱和度 气井产能 

分 类 号：TE135[石油与天然气工程—油气勘探]