摘要
概述了水锁效应机理、评价方法和解除技术的最新进展。水锁效应受到储层毛细管半径、侵入流体的界面张力、润湿角、流体黏度、驱动压差和外来流体侵入深度等因素的影响,其中界面张力的影响最大。水锁解除方法主要包括物理解除法、化学解除法和物理-化学耦合法,在化学解除法中以降低界面张力和改变润湿性为主要机理。目前最有前途的2种水锁解除剂是非离子含氟聚合物表面活性剂和生物表面活性剂,但这2种处理剂的作用机理有待于深入研究。指出,物理-化学耦合法将是未来彻底解除水锁伤害的最有效方法。
This paper discusses the mechanism of water block,the evaluation methods for water block and the newest progresses made in water block removal.Water block is affected by several factors,among which the interfacial tension is the most important factor.Water block can be removed by physical method,chemical method and physic-chemical coupling method.In chemical method,water block is removed by reducing interfacial tension and changing the wetting property of the interface.Two most important water block removal agents presently used are non-ionic fluoro-polymer surfactant and bio-surfactant,respectively.The working mechanism of these two agents is yet to be studied.The most effective method of water block removal will be the physic-chemical coupling method.
出处
《钻井液与完井液》
CAS
2009年第6期65-68,共4页
Drilling Fluid & Completion Fluid
基金
国家重大项目"低渗油气田高效开发钻井技术"课题四"低渗油气田储层保护技术"(2008ZX05022-004)
