New method of aquifer influx risk classification for wells in gas reservoir with aquifer support
Received date: 2015-04-02
Revised date: 2015-09-18
Online published: 2016-01-10
During the development of gas reservoirs with strong bottom or edge aquifer support,how to quantitatively evaluate the risk of water breakthrough comprehensively considering the variety of dynamic and static parameters and make early warning for the wells which the water coning will break through are urgent problems to be solved.Currently,the published literatures on these questions are relatively one-sided.Aiming at the questions mentioned above,firstly,the evaluation index system of static and dynamic parameters associated with water breakthrough in gas reservoirs is established.Then based on the index system,the paper used analytic hierarchy process and fuzzy evaluation to evaluate the risk of water breakthrough.And finally water breakthrough sequence of gas wells can be quantitatively evaluated.The paper took Kela2 abnormal high pressure gas reservoir with bottom and edge aquifer drive for example to illustrate how to use the method to evaluate aquifer influx risk of all gas wells.And all gas wells are classified into 4 types based on the risks of aquifer influx,and water breakthrough sequence of all wells are also determined.Actual gas well performances validate this new method.Furthermore,the evaluation results are very useful for well production rate optimization and gas field effective development.
Li Yong,Zhang Jing,Li Bao-zhu,Xia Jing,Guo Kai,Hu Yun-peng,Wang Dai-gang . New method of aquifer influx risk classification for wells in gas reservoir with aquifer support[J]. Natural Gas Geoscience, 2016 , 27(1) : 128 -133 . DOI: 10.11764/j.issn.1672-1926.2016.01.0128
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