Adaptability Evaluation of Coal-bed Methane Well Completion Methods Based on Multi-objective Decision-making Method
Gang Yang1, Zhiming Wang2
1 MOE Key Laboratory of Petroleum Engineering , China University of Petroleum, Beijing, China.
2 Corresponding author, Zhiming Wang, MOE Key Laboratory of Petroleum Engineering, China
University of Petroleum (Beijing), 18 Fuxue Road, Changping District, Beijing, 102249, China.
Email: wellcompletion@126.com.
Structural Longevity 2013, 9(3), 153-168. https://doi.org/10.3970/sl.2013.009.153
Abstract
Coalbed methane (CBM) is an important natural gas resource, and
appropriate well completion method is very important to increase productivity. At
present there are many CBM well completion methods, including fractured vertical well, open-hole cavity well, U-shape well, V-shape well and pinnate horizontal well. Aim at the diversity of CBM well completion methods, multi-objective
decision-making method is used to evaluate these completion methods and select
the best completion to maximize economic benefit. Firstly implements production
prediction and economic evaluation for each completion method, and then chooses
multi-objective decision-making method to evaluate five indexes: cumulative gas
production, net present value, invest recovery period, internal rate of return and risk
factor, thus the most appropriate completion method can be achieved.
With this evaluation method applied to Ordos Basin, numerical simulation results
show that pinnate horizontal well predominate in the beginning of exploitation
compared with other completion methods, and its advantages dwindle due to limited reservoir supply capacity in the latter period. In spite of its huge investment and
high risk, with high productivity, its NPV far overweighs other completion methods, so the pinnate horizontal well is the most suitable completion method. The
adaptability evaluation method proposed provides favorable guidance for on-site
CBM well completion method design, which has a great significance to improve
China’s CBM development effect.
Keywords
Well completion methods, Production prediction, Economic evaluation, Multi-objective decision-making method.
Cite This Article
Yang, G., Wang, Z. (2013). Adaptability Evaluation of Coal-bed Methane Well Completion Methods Based on Multi-objective Decision-making Method. Structural Longevity, 9(3), 153–168.