Articles

Well Test Analysis of Water Injection Wells in Low-permeability Unconsolidated Oil Reservoirs

  • LEI Xiao ,
  • SUN Zhaobo ,
  • WANG Yanyan ,
  • LIU Shuangqi ,
  • WANG Shichao
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  • 1. Zhanjiang Branch, CNOOC (China) Co., Ltd., Zhanjiang 524057, China;
    2. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China

Received date: 2014-02-16

  Revised date: 2014-05-13

  Online published: 2014-07-22

Abstract

Low-permeability unconsolidated reservoirs have a threshold pressure gradient to a certain extent due to low permeability. In addition, the reservoir rock shows medium to strong stress sensitivity because of the unconsolidated cementation, resulting in low oil flow velocity. Therefore, it is difficult to obtain sufficient information to make a reasonable interpretation. Water-injection well test is a good way to solve this problem. Based on analysis of the mobility ratio, the effects of stress sensitivity and threshold pressure gradient, a mathematical model for water-injection well test in low-permeability unconsolidated reservoirs was established. Since this model has strong nonlinearity, stable finite-difference scheme and Newton-Raphson iteration method were adopted to obtain the arithmetic solution. The pressure performance and influencing factors were also evaluated, and the typical well testing curves for analysis of real datawere plotted.

Cite this article

LEI Xiao , SUN Zhaobo , WANG Yanyan , LIU Shuangqi , WANG Shichao . Well Test Analysis of Water Injection Wells in Low-permeability Unconsolidated Oil Reservoirs[J]. Science & Technology Review, 2014 , 32(20) : 69 -73 . DOI: 10.3981/j.issn.1000-7857.2014.20.011

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