对低渗气藏渗流机理实验研究的新认识

低渗致密气藏储量大但开发困难，注重开发过程中的机理研究则有利于合理地制定技术政策。为此，重点讨论了低渗气藏的机理问题：①启动压力是否存在，如何测试？其对开发的影响如何；②应力敏感是否存在，应当如何测试才更有代表性；③低渗致密气藏束缚水饱和度较高，而原始含水饱和度低，但在开发中仍会产出地层水的原因是什么；④凝析水析出会不会对地层造成污染；⑤低渗致密气藏衰竭过程中凝析油污染情况如何？所探讨的问题对我国低渗致密气藏的开发有着指导意义。

NEW IDEAS OBTAINED FROM LABORATORY STUDY OF FLOWING MECHANISMS IN LOW-PERMEABILITY RESERVOIRS

In low permeability and compacted reservoirs, there are usually significant amount of reserves difficult to develop. So, figuring out key mechanisms dominating the developing process can benefit the decision making process of reasonable development plan. This paper discussed mechanisms as follows: ①Is there initial pressure? If there is, then how to measure it and how much it would influence the development process? ②Is there pressure sensitivity? How to get representative measurement? ③In low permeability and compacted reservoirs, the irreducible water saturation is usually low while the initial water saturation is fairly high, so what causes the formation water produced in the development? ④Does the condensed water damage the formation or not? ⑤How was the condensate polluted during the depleting process of low permeability and compacted reservoirs? This paper puts forward that all those issues mentioned above will have some value in reference for developing low permeability and compacted reservoirs.