Studies on Water Invasion Mechanism of Fractured-watered Gas Reservoir

FAN Huai-cai, ZHONG Bing, LI Xiao-ping, LIU Yi-cheng, YANG Hong-zhi, FENG Xi, ZHANG Yuan-hui

doi:10.11764/j.issn.1672-1926.2012.06.1179

Natural Gas Geoscience >

2012 , Vol. 23 >Issue 6: 1179 - 1184

DOI: https://doi.org/10.11764/j.issn.1672-1926.2012.06.1179

Studies on Water Invasion Mechanism of Fractured-watered Gas Reservoir

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1.The Center for Post-doctoral Studies of Southwest Oil and Gas Field Company,PetroChina,Chengdu 610041,China;
2.The Post-doctoral Research Station of Southwest Petroleum University,Chengdu 610500,China;3.Exploration and
Development Research Institute of Southwest Oil and Gas Field Company,PetroChina,Chengdu 610041,China;
4.Chongqing Gas Field,PetroChina Southwest Oil and Gas Field Company,Chongqing 400021,China

Received date: 2012-01-12

Revised date: 2012-08-05

Online published: 2012-12-10

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Abstract

During the development of fractured and watered gas reservoir,production wells can be easily accessed by the edge water or bottom water along the fracture channel,and gas-water flow is developed.This causes the increase of flow resistance,closure and separation of some gas area,hence,the decrease of well production and recovery,which has great harm to gas production.Based on the characteristics of the fractured and watered gas reservoir,a physical model of displacement of gas by water is established.By means of water invasion seepage modeling experiment,the microscopic mechanism of water invasion about the gas reservoir is found.When the gas reservoir is watered,gases are dominated by trapped gas,cut gas and water-locked gas.Water invasion of gas reservoir can be macroscopically classified into water invasion of rocks with low permeability,water invasion of gas reservoir and “reverse water invasion” of well shutdown.It makes the gas area separated and watered,and changes the mobile gas into “dead gas”.Combined with the mechanism of water invasion of gas reservoir,the water invasion rules of K6 gas well fracture system has been studied,which provided a sound basis for the development and adjustment of gas reservoirs.

Key words： Fractured gas reservoir; Seepage experiment of water displacing gas; Water invasion; Trapped gas; Mechanism

Cite this article

FAN Huai-cai, ZHONG Bing, LI Xiao-ping, LIU Yi-cheng, YANG Hong-zhi, FENG Xi, ZHANG Yuan-hui . Studies on Water Invasion Mechanism of Fractured-watered Gas Reservoir[J]. Natural Gas Geoscience, 2012 , 23(6) : 1179 -1184 . DOI: 10.11764/j.issn.1672-1926.2012.06.1179

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