摘要
川西新场气田JS21、JS23储层品质差,属于难动用储量,储层改造过程中容易造成水锁伤害,而储层启动压力的变化能够反映外来液体水锁伤害的大小。在分析储层水锁伤害机理的基础上,通过室内实验的方法测定了新场气田JS21储层的启动压力梯度值,并对影响储层启动压力的因素,如岩心渗透率、含水饱和度、外来液体的入侵深度和性质进行了定量分析。经研究发现,渗透率的降低导致启动压力的增加,启动压力随含水饱和度的增加而增加,破胶液的滤失是造成储层水锁伤害的主要原因。提出优化压裂液配方,提高破胶液返排性能和质量是降低储层水锁伤害程度的关键措施。
The reservoirs JS21 and JS23 in Xinchang gas field are hard to develop because of the poor quality and the water block resulted from fracturing. The actuating pressure gradient value of reservoir JS21 and influencing factors such as permeability water saturation and invasion depth of exotic fluid are tested and analyzed in laboratory. The results of experiments show higher actuating pressure is caused by the decrease of permeability, and it increases with water saturation. The filtration of breaking is the main influencing factor leading to water block. Moreover, optimizing fracturing fluid formulation and improving flowback efficiency are the effective solutions.
出处
《钻井液与完井液》
CAS
2011年第2期70-72,100,共3页
Drilling Fluid & Completion Fluid
基金
国家重大专项<大型油气田及煤层气开发>(2008ZX05000)二级专题<四川盆地低渗气藏储层改造工艺技术研究>
关键词
低孔低渗储层
难动用储量
启动压力
水锁伤害
新场气田
Low porosity and permeability reservoir
Hard-develop reserves
Actuating pressure
Water block
Xinchang gas field
