The experimental study of water invasion mechanism in fracture and the influence on the development of gas reservoir

Hu Yong, Li Xi-zhe, Wan Yu-jin, Jiao Chun-yan, Xu Xuan, Guo Chang-min, Jing Wei

doi:10.11764/j.issn.1672-1926.2016.05.0910

Natural Gas Geoscience >

2016 , Vol. 27 >Issue 5: 910 - 917

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.05.0910

The experimental study of water invasion mechanism in fracture and the influence on the development of gas reservoir

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1.Langfang Branch,Research Institute of Exploration and Development,PetroChina，Langfang 065007,China;
2.The Key Laboratory of Gas Reservoir Formation and Development,Langfang 065007,China;
3.Petrochina Qinhai Oilfield Company,Dunhuang 736200,China

Received date: 2015-07-07

Revised date: 2015-09-04

Online published: 2019-09-20

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Abstract

Aimed at water invasion law in fracture-pore gas reservoir and influencing factors of recovery percent of gas reservoir,the physical simulation experiment technique was used in the water invasion law experiment of horizontal cut-through fracture,the water imbibition experiment of matrix rock and its impacts on the formation gas supply mechanism experiment.In the paper,difference between the water invasion in matrix rock and fracture is determined.The water invasion law and the influence mechanism of water invasion on gas reservoir productivity and recovery efficiency in fracture-pore edge-bottom water gas reservoir was acquired.In the process of the water invasion into the fractured gas reservoir,while the water is invading into the fracture fast,the water is imbibing into the matrix rock which will result in reduction of gas phase percolation roads,increase of the gas phase percolation resistance of matrix rock and reduction of gas reservoir productivity and ultimate recovery percent of gas reservoir.The knowledge revealed the reduction causes of the gas well productivity and the recovery ratio of gas reservoir after water invasion into the fractured gas reservoir.Based on the above knowledge,the relation of water encroachment frontier advance rate and formation physical property,water body size was studied further.The different permeability matrix rock imbibition capacity was tested.The influence of water imbibition style and imbibition volume on the stable yield and ultimate recovery percent of reserves is evaluated.The study achievements can provide technical support for the development of Dina and Keshen gas reservoir of Tarim Basin and Longwangmiao gas reservoirs in the Moxi block of Sichuan Basin.

Key words： Fracture-pore gas reservoir; Edge-bottom water; Water invasion mechanism; Water imbibition into the matrix rock; Experimental study

Cite this article

Hu Yong, Li Xi-zhe, Wan Yu-jin, Jiao Chun-yan, Xu Xuan, Guo Chang-min, Jing Wei . The experimental study of water invasion mechanism in fracture and the influence on the development of gas reservoir[J]. Natural Gas Geoscience, 2016 , 27(5) : 910 -917 . DOI: 10.11764/j.issn.1672-1926.2016.05.0910

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