致密油藏技术极限井距确定新方法  

A New Method for Determining Technical Limit Well Spacing in Tight Oil Reservoir

作　　者：田选华 胡罡 李鹏春[3] TIAN Xuanhua;HU Gang;LI Pengchun(School of Petroleum Engineering(Engineering Technology Research Center of Guangdong Province for Unconventional Energy),Guangdong University of Petrochemical Technology,Maoming,Guangdong 525000,China;School of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Key Laboratory of Ocean and Marginal Sea Geology,Chinese Academy of Sciences (South China Sea Institute of Oceanology,Chinese Academy of Sciences),Guangzhou,Guangdong 510301,China)

机构地区：[1]广东石油化工学院石油工程学院(广东省非常规能源工程技术研究中心),广东茂名525000 [2]成都理工大学能源学院,四川成都610059 [3]中国科学院边缘海与大洋地质重点实验室(中国科学院南海海洋研究所),广东广州510301

出　　处：《西安石油大学学报（自然科学版）》2021年第4期43-49,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项(2016ZX05011-002);广东省自然科学基金项目(2018A030313433);广东省非常规能源工程技术研究中心开放基金项目(GF2018A004,GF2018B004);广东石油化工学院引进人才科研启动项目(518170)。

摘　　要：技术极限井距是优化井网井距和评价致密油藏开发动用效果的关键技术参数,但现有的算法不能全面准确地反映具有启动压力梯度的致密油藏不稳定非线性渗流特征。为此,基于非线性渗流理论,从求解平面径向流的不稳定渗流问题入手,将启动压力梯度作为技术极限井距的计算依据,提出了计算致密油藏定产量生产条件下的技术极限井距的新方法。研究表明,新方法不仅理论依据充分,而且较以往的计算方法更可靠、合理、实用,因而具有较大的推广价值。The technical limit well spacing is the key technical parameter for optimizing well pattern and evaluating the development effect of tight reservoir,but the existing methods to determine the technical limit well spacing can not fully and accurately reflect the unstable nonlinear seepage characteristics of tight reservoir with threshold pressure gradient.Therefore,based on the nonlinear seepage theory,starting from solving the unsteady seepage of plane radial flow,taking the threshold pressure gradient as the basis for calculating the technical limit well spacing,a new method for calculating the technical limit well spacing under the condition of constant production in tight reservoir is proposed.The research shows that the new method not only has sufficient theoretical basis,but also is more reliable,reasonable and practical than the previous calculation methods,so it has better popularization value.

关 键 词：致密油藏 启动压力梯度 非线性渗流 不稳定渗流 技术极限井距 

分 类 号：TE348[石油与天然气工程—油气田开发工程]