裂缝应力敏感性对异常高压低渗透气藏气井产能的影响  

Influence of Fracture stress sensitivity on gas well productivity of gas reservoirs with abnormal high pressure and low permeability

作　　者：向祖平[1] 陈中华[2] 邱蜀峰[3] 

机构地区：[1]中国石化西南油气分公司博士后科研工作站,四川成都610081 [2]中国石油西南油气田公司勘探开发研究院,四川成都610051 [3]中国石油西南油气田分公司川东北气矿勘探开发科,四川达州635001

出　　处：《油气地质与采收率》2010年第2期95-97,共3页Petroleum Geology and Recovery Efficiency

基　　金：中国石油科技创新基金"含CO2高含硫气藏硫沉积预测模型及应用研究"(2008D-5006-02-09);中国石油天然气集团公司中青年创新基金项目"注N2开发有水气藏中基于分形理论的气水两相微观渗流机理及其应用研究"(07E1016)

摘　　要：异常高压低渗透致密气藏由于其自身的地质特征,大多需进行压裂后才能投产。而在衰竭式开发过程中,裂缝表现出很强的应力敏感性,会明显影响气藏的开发效果。为此,在渗流力学基础上,建立了考虑裂缝应力敏感性的三维气、水两相流双重介质数值模型,并编写了相应的数值模拟软件。结果表明,裂缝应力敏感性对气井产能具有一定影响,并导致气井所需生产压差明显增大,但对气井的稳产能力影响较小。而异常高压气藏由于原始地层压力高,有效应力变化范围大且变化的下限低,导致储层岩石具有更强的应力敏感性,因此,在进行异常高压低渗透气藏压裂气井的生产动态预测时,应充分考虑裂缝应力敏感性的影响,以使编制的开发方案能更加准确地指导该类气藏的开发。Most high pressure and low permeability gas reservoirs can be put into production only after fracturing due to their geological fea-tures.During the natural depletion development.fractures will show strong stress sensitivity,which will apparently influence the development performance.Hence.it is of great significance to study the influence of fracture stress sensitivity on such gas reser-voirs during the development.However,the influence of fracture stress sensitivity is not highly considered as an important factor constraining the development of such gas reservoirs.In response to the problems above,based on the reservoir fluid mechanism theory,we established the three-dimensional gas and water two-phase dual-porosity numerical model that takes into account of the fracture stress sensitivity,and programmed the corresponding dual-porosity numerical simulation software.The result shows that the fracture stress.sensitivity,which exerts certain influence on gas well productivity and minor influence on gas well produc-tion rate-maintenance capability.can result in higher producing pressure differential required for gas wells.Moreover,reservoir rocks possess higher stress sensitivity due to the high original formation pressure,wide range and low limit of effective stress var-iation in high pressured gas reservoirs.Therefore.the influence of stress sensitivity should be fully considered for the prediction of fractured gas well production performance in high pressure and low permeability gas reservoirs,which makes the development program more feasible for the gas reservoirs.

关 键 词：裂缝应力敏感性 异常高压 低渗透气藏 气井产能 单井模拟 

分 类 号：TE358.3[石油与天然气工程—油气田开发工程]