Productivity evaluation and new understanding for horizontal well of large scale tight sandstone gas

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  • Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

Received date: 2018-02-01

  Revised date: 2018-04-19

  Online published: 2018-08-29

Abstract

Fractured horizontal well technology is an effective means to develop tight sandstone gas reservoirs.While horizontal wells development have achieved excellent performance in Sulige Gasfield,there are practical problems including difficulty in production characteristics,productivity evaluation and unreasonable production system,which influence horizontal well deployment and production management.For this,the gas field geology and horizontal well production characteristics were studied firstly.Then,productivity of horizontal wells was evaluated.Finally,reasonable production rate of horizontal wells considering long-term stable production is established.Results show that the initial decline rate of the horizontal wells in the Sulige Gasfield is very high in the different years,the decline rate in the middle and late stage is low,and the decline rate in the early stage of the new drilling increases year by year.The production of single well decreases rapidly in the early stage and gradually slows down in the middle and late stages,which is in line with the decrement law of exhaustion.The relationship of reasonable horizontal well production and absolute open flow rate is power function.Reasonable production proration gradually decreases with the increase of absolute open flow.The relationship of reasonable horizontal well production and well-controlled reserves is linear relation.It is the first time that single well controlled reserves are used to guide the rational distribution of fractured horizontal wells in order to achieve long-term stable production of single well.The research results have positive significance on the production of tight gas reservoirs.

Cite this article

Lü Zhi-kai, Jia Ai-lin, Tang Hai-fa, Liu Qun-ming, Wang Ze-long . Productivity evaluation and new understanding for horizontal well of large scale tight sandstone gas[J]. Natural Gas Geoscience, 2018 , 29(6) : 873 -879 . DOI: 10.11764/j.issn.1672-1926.2018.05.004

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