油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (3): 19-23.

• 油气藏评价 • 上一篇    下一篇

确定致密储层空气渗透率上限方法的改进与应用

刘大伟1,胡罡1,李实2,田选华1,3,李鹏春4   

  1. 1. 广东石油化工学院石油工程学院非常规能源工程技术研究中心,广东 茂名 525000
    2. 中国石油勘探开发研究院,北京 100083
    3. 成都理工大学油气藏地质及开发工程国家重点实验室,四川 成都 610059
    4. 中国科学院南海海洋研究所边缘海与大洋地质重点实验室,广东 广州 510301
  • 收稿日期:2017-12-01 出版日期:2018-06-26 发布日期:2018-12-07
  • 作者简介:刘大伟(1980—),男,博士,副教授,非常规油气藏钻采及开发研究。
  • 基金资助:
    国家自然科学基金“CO2高注入压力对海底断层泄漏特性的影响机理研究”(41372256);中国石油科技创新基金项目“致密油藏CO2驱提高采收率技术研究”(2015D-5006-0203);广东省自然科学基金项目“入井流体损害煤层气多尺度传质机理研究”(2016A030307024)

Improvement and application of method for calculating upper permeability limit in tight oil reservoir

Liu Dawei1,Hu Gang1,Li Shi2,Tian Xuanhua1,3,Li Pengchun4   

  1. 1. School of Petroleum Engineering (Engineering Technology Research Center of Guangdong Province for Unconventional Energy), Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China
    2. Research Insititute of Petroleum Exploration and Development, Cnpc, Beijing 100083, China
    3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
    4. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, Guangdong 510301, China
  • Received:2017-12-01 Online:2018-06-26 Published:2018-12-07

摘要:

致密储层空气渗透率上限是评价致密油资源量和优选致密油藏合理开发方式的重要参数,但现有的计算与确定方法尚不能全面准确地反映致密油藏地质及开发特征,尤其是不能较好反映致密油渗流特征和当前国内外有关致密油在开发方式上的统一认识。在调研国内外致密油储层物性上限确定方法的基础上,以渗流理论为指导,从致密油藏开发生产实践入手,应用致密油储层启动压力梯度与空气渗透率之间的幂函数关系建立了致密储层空气渗透率上限计算模型。研究表明,基于在开发方式上的统一认识,认为致密油储层开发虽然存在一定困难,但是通过技术攻关可以实现有效经济动用,或在目前开发技术条件下难以实现经济动用的储层,这一认识决定了致密储层物性上限计算与确定方法必须要全面准确反映受启动压力梯度影响致密油出现非达西渗流的特征;该新方法完整地立足于致密油非达西渗流理论及其开发实践,因而具备充分的致密油渗流及开发理论依据;同时,该新方法从纯数学计算的角度入手,因而较以往的计算方法可靠、合理、实用,更具推广价值。

关键词: 致密储层, 空气渗透率上限, 水驱油实验, 启动压力梯度

Abstract:

In tight oil reservoirs, the upper limit value of permeability is an important parameter, which is used to determine the tight oil reserves and reasonable development way. The existing calculation or determination methods can't fully and accurately reflect the geology and development characteristics in tight oil reservoirs. It can't even better reflect the characteristics of the seepage and the current unity understanding which is embodied in the development way of tight oil reservoir at home and abroad. On the basis of the research on the methods for calculating the upper permeability limit in tight oil reservoir at home and abroad, by using the seepage theory, and from dense reservoir development and production practice, we proposed a new method, which is used to calculate the upper limit value of permeability in tight oil reservoir by the power function relationship between the air permeability and start-up pressure gradient. The studies show that based on the unified understanding on the development of the tight oil reservoir, although there are some difficulties during it, the tight oil reservoir could realize the effective economic usage through the technology research, and the tight oil reservoir could be difficult to achieve the economic usage of the reservoir under the condition of the development technology. This understanding determines that the calculation and determination of the upper limit value of permeability in tight oil reservoir must fully and accurately reflect the characteristics of the non-Darcy seepage in the tight oil reservoir, which is affected by the start-up pressure gradient. The new method has the theoretical basic. At the same time, the new method not only relies on the mathematical theory, but also is more sufficient in theoretical basis, and more reliable, reasonable and practical than the previous calculation methods. Therefore, it has better promotion value.

Key words: tight oil reservoir, upper permeability limit, displacement experiment, start-up pressure gradient

中图分类号: 

  • TE348