确定气井临界水饱和度的方法  

A METHOD OF DETERMINING THE CRITICAL WATER SATURATION IN GAS WELL

作　　者：费怀义[1] 陈心胜[1] 

机构地区：[1]四川石油管理局川东钻探公司

出　　处：《天然气工业》1997年第6期31-33,共3页Natural Gas Industry

摘　　要：气井临界水饱和度是指在工业气流产量下限时所对应的最大含水饱和度。确定气井临界水饱和度对划分气井有效厚度、计算储量都是非常重要的，它不仅与测试产能有关，而且和岩石孔隙结构（反映在相对渗透率上）有关。储层孔隙结构越好，测试产能越高，临界水饱和度越高，其对应的有效孔隙度下限越低。采用试井原理并结合相对渗透率资料，通过迭代试差法可求取气井临界水饱和度，进而确定气井含气饱和度与有效厚度。该方法已在川东多个石炭系气藏中使用。The critical water saturation in gas well means the maximum water saturation corresponding to the cutoff of commercial gas production.It is very important to determine the critical water saturation for dividing the effective thickness in gas well and for estimation of reserves.It is related not only to the tested productivity but also to the pore structure (being a reflection of relative permeability) of rock.The better the pore structure of reservoir,the higher the tested productivity and the critical water saturation,the lower the correspondent cutoff of effective porosity.In light of well test principle and by combining with relative permeability data,the critical water saturation in gas well may be acquired through iterative trial-and-error method,thus the gas saturation and effective thickness in gas well can be determined.The method has been applied in many Carboniferous reservoirs in East Sichuan and a fairly good result being obtained.

关 键 词：气井 临界饱和度 地质储量 渗流性能 

分 类 号：TE312[石油与天然气工程—油气田开发工程] TE37