王府气田致密低渗气藏毛管压力影响因素实验研究  

Experimental research of influencing factors on capillary pressure in tight low-permeability formation in Wangfu gasfield

作　　者：王志超[1] 

机构地区：[1]中国石油吉林油田分公司,吉林松原138000

出　　处：《石油化工应用》2017年第2期17-22,34,共7页Petrochemical Industry Application

基　　金：国家油气科技重大专项资助项目;项目编号:2011ZX05054

摘　　要：水锁伤害广泛存在于致密低渗透气藏中,严重影响气藏的开发效果,而毛管压力是影响水锁伤害的根本因素。分析了毛管压力产生的机理,推导了储层毛管压力的计算公式,并讨论了毛管压力的影响因素。基于所取得的岩心以及工作液样品,设计了针对不同层位、不同工作液组合的实验方案。由实验数据、计算分析可知,王府气田城深X井各层位毛管压力大小顺序是:登娄库组>沙河子组>火石岭组,即登娄库组的潜在水锁伤害程度最大;从减小水锁伤害的角度来讲,JK1002羧甲基胍胶压裂液体系是最优的;此外,压井液有利于促进储层亲水性的减弱,而使压裂液进入储层后使储层岩石亲水性变得更弱。Water blocking is one of the major types of damage to tight low-permeability gas reservoir, which adversely affects the developing effect. It is known that capillary pressure is a key factor to influence the degree of water blocking. In this paper, the mechanism of producing capillary pressure is analyzed. Then the computational formula of capillary pressure in reservoir is deduced, and the influencing factors are discussed. Based on obtained drilling cores and operating fluid, a set of experiment scheme aimed at different reservoir layers and different combination of operating fluid systems is finished. After analyzing the experimental results, we can find that the longitudinal rank of capillary pressure in well Chengshen X at Wangfu gasfield is as follows, Denglouku formation 〉 Shahezi formation 〉 Huoshiling formation, and it can be found that water blocking in Denglouku formation will be more serious theoretically. From the view of decreasing water blocking, carboxymethyl guar gum fracturing fluid of JK1002 is most excellent between these three sorts. Finally, it is proved that the well killing fluid can help to reduce the hydrophilicity of reservoir, then reservoir will be much less hydrophilic after a large amount of fracturing fluid enters.

关 键 词：低渗透 气藏 水锁伤害 毛管压力 压井液 压裂液 

分 类 号：TE37[石油与天然气工程—油气田开发工程]