雷刚,董睿涛,杨书,李振
LEI Gang,DONG Ruitao,YANG Shu,LI Zhen

• 1:中国石油大学石油工程教育部重点实验室

摘要(Abstract)：

基于致密砂岩气藏中气体非达西渗流特征,考虑应力敏感效应的影响,推导了致密砂岩气藏在拟稳态流动阶段的垂直裂缝气井产能方程,并得到了气井无阻流量计算式。实例计算结果表明:受到应力敏感效应影响,气井产能向压力轴弯曲,在相同的生产压差下,气井产量比不考虑应力敏感效应的产量低;应力敏感系数越大,产能曲线弯曲越早、弯曲度越大,气井产量越低,产量下降率越大;应力敏感系数越大、基质有效渗透率越低、裂缝半长越小、裂缝导流能力越小,垂直裂缝气井的产量越小。为保证垂直压裂气井的开发效果,压裂作业应尽量布置在基质渗透率较高的区域。
Based on the characteristics of the non-Darcy seepage in tight sandstone gas reservoirs,the productivity equation for the vertical fractured wells is deduced in the pseudo-steady state of the gas reservoirs considering the effects of the stress sensitivity.And moreover the open flow capacity calculating formula of the gas wells is derived.The computed results of the history case show that because of the effect influence of the stress sensitivity,the productivity curves of the producers are bended to the pressure axis and the productivities are lower than the those without considering the stress sensitive effects under the same condition of the producing pressure differences;the bigger the stress sensitive coefficient is,the earlier and more serious the productivity curves are bended,the lower the production wiU be and more serious the yield reduction rate will be;the bigger the stress sensitive coefficient is,the lower the matrix effective permeability is,the smaller the half-length of the fracture or fracture conductivity is,the lower the production of the vertically fractured gas wells will be.In order to ensure the development effects of the vertically fractured wells,the fracturing operation should be arranged in the high-permeability zones as possible as you can.

关键词(KeyWords)： 致密砂岩;拟稳态;非达西渗流;应力敏感;垂直裂缝井
tight sandstone;pseudo-steady state;non-Darcy seepage;stress sensitivity;vertically fractured well

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“裂缝性油气藏流固耦合渗流基础研究”(50004002)

作者(Author): 雷刚,董睿涛,杨书,李振
LEI Gang,DONG Ruitao,YANG Shu,LI Zhen

参考文献(References)：

• [1]汪永利,蒋廷学,曾斌.气井压裂后稳态产能的计算[J].石油学报,2003,24(4):65-68.
• [2]蒋廷学,单文文,杨艳丽.垂直裂缝井稳态产能的计算[J].石油勘探与开发,2001,28(2):61-63.
• [3]曾杨,贺陆军,廖剑波,等.应力敏感性低渗透气藏垂直裂缝井非达西渗流产能分析[J].特种油气藏,2012,19(5):90-92.
• [4]张强,王永清,张楠,等.低渗透应力敏感气藏压裂井产能分析[J].特种油气藏,2012,19(3):74-76.
• [5]张强,王永清,章双龙,等.考虑启动压力和二次梯度的压裂井稳态渗流模型[J].特种油气藏,2011,18(6):89-91.
• [6]李冬瑶,程时清,郑春峰.考虑滑脱效应的低渗透气藏压裂井产能分析[J].特种油气藏,2009,16(2):59-61.
• [7]李伟,于士泉,郑丽坤.确定三项式产能方程系数的新方法[J].大庆石油地质与开发,2008,27(4):61-63.
• [8]杨正明,张松,张训华,等.气井压后稳态产能公式和压裂数值模拟研究[J].天然气工业,2003,23(4):74-76.
• [9]尹洪军,刘宇,付春权.低渗透油藏压裂井产能分析[J].特种油气藏,2005,12(2):55-56..
• [10]李生,李霞,曾志林,等.低渗透油藏垂直裂缝井产能评价[J].大庆石油地质与开发,2005,24(1):54-56.
• [11]罗天雨,赵金洲,郭建春.求取压裂后气井产能的椭圆流方法[J].天然气工业,2005,25(10):94-96.
• [12]周琦,姜汉桥,李志刚.低渗透气藏垂直裂缝井产能计算[J].油气井测试,2009,18(2):8-11.
• [13]李闽,薛国庆,罗碧华,等.低渗透气藏拟稳态三项式产能方程及应用[J].新疆石油地质,2009,30(5):593-595.
• [14]廖新维.双重介质拟稳态油藏斜井试井模型研究[J].石油勘探与开发,1998,25(5):57-61.
• [15]邓英尔,刘慈群.垂直裂缝井开发低渗透油藏非线性渗流压力分析[J].石油勘探与开发,2003,30(1):81-83.