Typical Production Curve Types and its Geological Meaning of CBM Wells in Fanzhuang Block, China

DOI

10.2991/icache-16.2016.47How to use a DOI?

Keywords

CBM; Production curve; casing pressure; inter-well interference

Abstract

Based on reservoir characteristics and production curves of 49 CBM wells in Fanzhuang block, the production curves were divided into five types: single-peak type, double-peak type, step type, linear type, triple-peak type. According to geological factors such as CBM content, permeability and engineering factors like daily water production, casing pressure lowering depth in prior period, inter-well distance, the formation mechanism of 5 types of production curves were analyzed. Research suggests that daily CBM production has a positive correlation with CBM content and permeability. In contexts that inter-well distance is similar to daily water production, fast rate of decline of casing pressure will cause CBM production peak in the short term, production curves of poor reservoir physical property tend to single-peak type, production curves of good reservoir physical property tend to double-peak type; slow rate of decline of casing pressure will cause low production in initial period, and CBM production rising steadily with the gradual decreases of casing pressure, production curves of good reservoir physical property tend to step type, production curves of poor reservoir physical property tend to linear type; the forming reasons for triple-peak type mainly are gas supply of descending CBM wells around, good coal reservoir property (high CBM content, high permeability) and inter-well interference.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Mengxi Li
AU  - Jun Tang
AU  - Zhouqi Cui
AU  - Shuaishuai Liu
AU  - Yanjun Chen
AU  - Wei Yu
PY  - 2016/11
DA  - 2016/11
TI  - Typical Production Curve Types and its Geological Meaning of CBM Wells in Fanzhuang Block, China
BT  - Proceedings of the 2016 2nd International Conference on Architectural, Civil and Hydraulics Engineering (ICACHE 2016)
PB  - Atlantis Press
SP  - 242
EP  - 248
SN  - 2352-5401
UR  - https://doi.org/10.2991/icache-16.2016.47
DO  - 10.2991/icache-16.2016.47
ID  - Li2016/11
ER  -