硬石膏胶结的低渗透砂岩油藏水敏性伤害的微观机理  

Microscopic Mechanism of Water-sensitive Damage of Low Permeability Sandstone Reservoir Cemented by Anhydrite

作　　者：董沅武 柳建新[1] 牟莎莎 陈金建 刘航 DONG Yuan-wu;LIU Jian-xin;MOU Sha-sha;CHEN Jin-jian;LIU Hang(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Petroleum Engineering Technology Research Institute,Jianghan Oilfield Branch,China Petrochemical Corporation,Wuhan 430035,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]中国石油化工股份有限公司江汉油田分公司石油工程技术研究院,武汉430035

出　　处：《科学技术与工程》2021年第10期3992-3998,共7页Science Technology and Engineering

基　　金：湖北省自然科学基金(2017CFB486)。

摘　　要：为准确认识江汉油田硬石膏胶结的低渗透砂岩油藏压裂过程中水敏性伤害的原因,结合储层地质资料,并通过原位扫描电镜、X射线衍射、薄片分析等方法对目标油藏进行储层伤害微观机理研究。结果表明:储层中作为胶结物的硬石膏导致的水化膨胀和溶解再沉淀,砂粒脱落是引起压裂过程中水敏伤害的主要原因。因此可以在压裂液中加入合适的阻垢剂,防治石膏引起的储层伤害问题。In order to accurately understand the causes of water sensitivity damage during the fracturing process of an anhydrite cemented low-permeability sandstone reservoir in Jianghan Oilfield, combined with reservoir geological data, In-situ scanning electron microscopy, X-ray diffraction, thin section analysis and other methods were used to analyze the microscopic mechanism of damage to the target reservoir. Results show that the hydration expansion, dissolution, re-precipitation and the shedding of sand particles caused by anhydrite as a cement in the reservoir are the main causes of water-sensitive damage during the fracturing process. It can be seen that adding a suitable scale inhibitor to the fracturing fluid can prevent and control reservoir damage caused by gypsum.

关 键 词：低渗透 硬石膏 储层伤害 微观机理 水敏 

分 类 号：TE258.2[石油与天然气工程—油气井工程]