首页 | 本学科首页   官方微博 | 高级检索  
     

启动压力梯度和应力敏感效应对低渗透气藏水平井产能的影响
引用本文:郭肖,伍勇.启动压力梯度和应力敏感效应对低渗透气藏水平井产能的影响[J].石油与天然气地质,2007,28(4):539-543.
作者姓名:郭肖  伍勇
作者单位:西南石油大学, "油气藏地质及开发工程"国家重点实验室, 四川, 成都, 610500
基金项目:中国石油天然气集团公司资助项目;四川省教育厅资助项目
摘    要:由于低渗透气藏具有低孔、低渗特征,导致其气水渗流特征较为复杂,传统意义上的经典渗流规律不再适用于低渗透气藏。大量实验研究和现场应用证实低渗透气藏中存在渗流的非线性和流态的多变性,流体渗流不仅需要克服启动压力梯度,同时气体渗流还要受制于应力敏感效应影响。由于水平井是开发低渗透气藏最有效的方法之一,目前低渗透气藏水平井产能研究大多局限于传统意义上的经典渗流理论,通常忽略了应力敏感效应和启动压力梯度作用。针对低渗透气藏渗流特征,引入变换方法建立了低渗透气藏水平井产能模型,模型考虑了应力敏感效应和启动压力梯度的影响。并以某低渗透气藏为例,研究了应力敏感效应和启动压力梯度对低渗透气藏水平井产能的影响。结果表明:1)启动压力梯度和压力敏感对水平气井产量影响分别呈线性下降关系和幂函数下降关系;2)压力敏感效应比启动压力梯度对水平气井产量影响更为强烈;3)启动压力梯度达到0.00025 MPa/m,水平气井产量将降低77%;当介质变形系数达到0.15 MPa-1,水平气井将停产;4)建议低渗透气藏水平井产能预测时必须考虑启动压力梯度和应力敏感效应的影响。

关 键 词:低渗透气藏  启动压力梯度  应力敏感  水平井产能  
文章编号:0253-9985(2007)04-0539-05
收稿时间:2007-06-08
修稿时间:2007-06-08

Influence of start-up pressure gradient and stress sensitivity on productivity of low-permeability gas reservoirs
Guo Xiao,Wu Yong.Influence of start-up pressure gradient and stress sensitivity on productivity of low-permeability gas reservoirs[J].Oil & Gas Geology,2007,28(4):539-543.
Authors:Guo Xiao  Wu Yong
Affiliation:State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation·Southwest Petroleum University, Chengdu, Sichuan 610500
Abstract:Water/gas percolation in low-permeability gas reservoirs is rather complicate because of the reservoirs'low porosity and low permeability.As a result,the traditional percolation law is inapplicable to this kind of reservoirs.Laboratory research and field application testify the nonlinearity of percolation and multi-variability of fluidal in the low permeability gas reservoirs.The percolation of fluid will not only need to overcome start-up pressure gradient,but will also be enslaved to stress sensitivity.Horizontal well technique is an effective method in low permeability gas reservoirs development.However,prediction of productivity of horizontal well in low permeability gas reservoirs is mostly carried out within the framework of traditional percolation theory and therefore fails to take start-up pressure gradient and stress sensitivity into consideration.In an attempt to fix the flaw,the conformal transformation is introduced in the establishment of a productivity model for horizontal wells in low-permeability reservoirs and the effects of start-up pressure gradient and stress sensitivity is studied based on the real data from a low-permeability gas reservoir.Results indicate that productivity of horizontal wells in low-permeability gas reservoirs decreases with start-up pressure gradient and stress sensitivity at a linear and an exponential relationship respectively.The stress sensitivity has a stronger impact on the productivity compared with start-up pressure gradient.When start-up pressure gradient reaches 0.00025 MPa/m,the productivity will be reduced to 77%;while when rock elastic distortion coefficient exceeds 0.15 MPa
Keywords:low-permeability gas reservoir  start-up pressure gradient  stress sensitivity  productivity of horizontal well
本文献已被 维普 万方数据 等数据库收录!
点击此处可从《石油与天然气地质》浏览原始摘要信息
点击此处可从《石油与天然气地质》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号