收稿日期: 2009-05-12
修回日期: 2009-07-14
网络出版日期: 2009-10-10
基金资助
国家重大专项“低渗透油气田储层保护技术”（编号：2008ZX05022-04）；四川省杰出青年学科带头人培养基金项目（编号：07ZQ026-113）;中国石油天然气集团公司应用基础研究项目（编号：07A20402）联合资助.
Aqueous Trapping Damage Models for Fracture pore Tight Sandstone Gas Reservoirs
Received date: 2009-05-12
Revised date: 2009-07-14
Online published: 2009-10-10
裂缝—孔隙型致密砂岩气藏具有低孔低渗、高毛管压力、裂缝发育、水湿性、高束缚水饱和度等地质特征。在钻井完井、增产改造及气藏开发过程中，滤液和边底水等侵入会导致气井近井地带含水饱和度上升，气相渗透率下降，致使发生水相圈闭损害。针对裂缝—孔隙型致密砂岩气藏的地质特征，对裂缝—孔隙网络系统在钻井和开发过程中不同的水相圈闭损害模式进行了研究，探讨了基块和裂缝系统中工作液和边底水侵入导致水相圈闭损害的形成过程和损害机理，提出在钻井、完井、修井、增产改造及开采过程中，通过屏蔽暂堵及欠平衡等技术减少工作液侵入量、优化工作液、增大返排压差、减少界面张力、蒸发或加热降低含水饱和度以及排水采气、均衡开发等措施防治水相圈闭损害。
张凤东, 康毅力, 游利军, 王永恒 . 裂缝—孔隙型致密砂岩气藏水相圈闭损害模式[J]. 天然气地球科学, 2009 , 20(5) : 812 -816 . DOI: 10.11764/j.issn.1672-1926.2009.05.812
Fracture-pore tight sandstone gas reservoirs are characterized by low porosity and permeability, high capillary pressure, fracture development, water wettability, and high irreducible water saturation. In the course of drilling, completion and development, filtrate intrusion would lead to water saturation increase and gas permeability decline near wellbore area, and result in aqueous trapping damage. Aiming at the geological characteristics, this paper studied different aqueous trapping damage models during drilling and development in fracture pore network system, and researched the aqueous trapping damage forming process and damage mechanism owing to operating fluid and edge and bottom water intruding into the matrix and fracture system. Then, it presented the measures to control aqueous trapping damage while drilling, completion, workover, production and development, such as temporary shielding techniques, underbalanced drilling, optimizing treatment fluid, enlarging flowback pressure difference, decreasing interfacial tension, evaporating or heating to reduce water saturation, drainage gas recovery, and equivalent development. With these treating, aqueous trapping damage can be effectively prevented.
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