Title: The deliverability evaluation of abnormal high pressure gas reservoir with stress sensitivity model

Authors: Hansen Sun; Yu Yang; Xiaodong Peng; Xindong Lv; Luyi Tong

Addresses: China United Coalbed Methane Co., Ltd., Beijing 100011, China ' Energy College of Chengdu University of Technology, Chengdu 610059, Sichuan Province, China ' Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, Guangdong Province, China ' Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, Guangdong Province, China ' Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, Guangdong Province, China

Abstract: The presence of stress sensitivity in abnormal high pressure gas reservoir will reduce the deliverability of gas wells. The permeability stress sensitivity must be taken into account in the calculation of gas well deliverability. Herein the deliverability test data of a gas well is taken as an example, and its deliverability is calculated by the adoption of pressure-squared, pseudo-pressure and enhanced pseudo-pressure type equation, which take into consideration the stress sensitivity. It is shown from the results that permeability stress sensitivity should be considered when constructing the productivity equation, and the pressure-squared methods can be approximately applied to calculate deliverability. On the basis of the study of the effect of permeability stress sensitivity on gas well deliverability, it was found that the stronger the stress sensitivity is, the lower its deliverability becomes.

Keywords: abnormal high pressure; gas reservoirs; permeability stress sensitivity; deliverability pseudo-pressure; sensitivity modelling; gas wells; gas well deliverability.

DOI: 10.1504/IJCAT.2014.066740

International Journal of Computer Applications in Technology, 2014 Vol.50 No.3/4, pp.270 - 275

Published online: 07 Feb 2015 *

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