Stimulation of natural cleats for gas production from coal beds by graded proppant injection
Date
2012
Authors
Bedrikovetsky, P.
Keshavarz, A.
Khanna, A.
Kenzie, K.M.
Kotousov, A.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference paper
Citation
SPE Asia Pacific Oil and Gas Conference and Exhibition, 22-24 October, Perth, Australia, 2012, vol.2, pp.1-27
Statement of Responsibility
P. Bedrikovetsky, A. Keshavarz, A. Khanna, K.M. McKenzie, A. Kotousov
Conference Name
2012 SPE Asia Pacific Oil and Gas Conference and Exhibition (22 Oct 2012 - 24 Oct 2012 : Perth, Australia)
Abstract
Graded injection of proppant particles with increasing size and decreasing concentration, proposed in the previous paper results in deep percolation of proppant into the natural fracture system, expansion of the stimulated zone and enhanced well productivity index. The mathematical model developed describes the proppant-free water injection stage, the capture kinetics of proppant particles in the natural fractures and the change in well index due to graded proppant injection. Computational fluid dynamics and classical Hertz theory have been used to determine the hydraulic resistance due to proppant plugging in the fracture system and the deformation of fractures during the production stage. An optimal injection schedule, i.e. the timely dependence of the injected proppant size and concentration that avoids fracture closure during production stage and provides minimum hydraulic resistance in the system of fractures plugged by proppant particles has been developed. The model is used to predict the change in well productivity index allowing estimating the feasibility of the graded particle injection for well stimulation in natural fractured systems. The aim of the current paper is to analyse the feasibility of application of the proposed graded proppant injection method for stimulation of the natural fracture system in 3 field cases of large coal bed methane reservoirs.
School/Discipline
Dissertation Note
Provenance
Description
Document SPE-158761-MS
Access Status
Rights
Copyright 2012, Society of Petroleum Engineers