基于室内实验的疏松砂岩气藏出水机理分析及堵剂评价  

Analyzing Water Production Mechanism and Evaluating Plugging Agent in Unconsolidated Sandstone Gas Reservoirs Based on Laboratory Experiments

作　　者：赵仁保[1] 刘翔[2] 柯文奇 冯兵[3] 侯永利[3] 周广厚[2] 岳湘安[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室中国石油大学提高采收率研究中心,北京102249 [2]中国石油勘探开发研究院廊坊分院天然气工艺所,河北廊坊065006 [3]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《石油天然气学报》2009年第1期142-146,共5页Journal of Oil and Gas Technology

基　　金：国家科技支撑计划资助项目(2006BAB03B07)

摘　　要：针对青海涩北气田地质及储层的物性特点,结合生产资料,研究了储层的出水原因;并结合物理模型评价了就地聚合复合凝胶封堵体系在储层中的注入性及封堵效果。结果表明,储层的水敏性极强,排除了层内出水的可能。因此可以推断,邻近水层通过固井水泥环及其与井壁/套管二界面处的裂缝窜至井筒是气井出水的主要原因。配方体系成胶前注入性与水相当,其材料强度明显高于硅酸钠凝胶体系,堵剂在人工胶结岩心中的封堵强度达到29.2MPa/m,岩心中老化1个月结果表明,其封堵强度保留率达到90%以上。A physical model was used to study the plugging effect of polymeric gel.Reservoir physical characteristics and production performance were investigated for Sebei Gas Field in Qinghai.Water production mechanisms was studied.The results show that the reservoir has strong water sensitivity,excludes the probability of water production from gas-bearing reservoirs.Consequently it can be inferred that water channeling behind casing was mainly the cause of water production.One kind of in-situ polymerization complex gel is prepared for water shutoff purposes.This gel is similar to water injectivity but higher than silicate gel in strength,and has excellent performance with plugging strength of 29MPa/m in artificial cores and plugging strength rate is above 90% after one month.

关 键 词：疏松砂岩 气藏 堵水 封堵率 涩北气田 

分 类 号：TE377[石油与天然气工程—油气田开发工程]