Studies on Transient Water Invasion Mechanism of the Triple Porosity Gas Reservoir with Bottom-water

FAN Huai-cai，ZHONG Bing，LIU Yi-cheng，YANG Xue-feng，FENG Xi，DENG Hui

doi:10.11764/j.issn.1672-1926.2015.03.0556

Natural Gas Geoscience >

2015 , Vol. 26 >Issue 3: 556 - 563

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.03.0556

Studies on Transient Water Invasion Mechanism of the Triple Porosity Gas Reservoir with Bottom-water

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Exploration and Development Research Institute of Southwest Oil & Gasfield Company,PetroChina,Chengdu 610041,China

Received date: 2014-11-21

Revised date: 2014-12-25

Online published: 2015-03-10

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Abstract

Fracture water breakthrough is the main characteristics of the water influx in the triple porosity gas reservoir with bottom-water.The law of water invasion is influenced by the reservoir characteristics,the size of the bottom aquifer and the producing pressure.Based on the characteristics of water invasion in the triple medium bottom-water gas reservoir,the gas reservoir is simplified as a cylindrical physical model that is "the gas horizon over the aquifer".In this model,the seepage flow in the triple porosity is abstracted as a process that water in the cave system and the matrix system channels to fracture system,and is produced through the fracture system.A transient seepage mathematical model for aquifer triple is established,and an accurate solution to the pressure of the fracture system is obtained by means of modern mathematical methods including the method of separation of variables,Bessel function and Laplace transformation,and the average pressure of gas-water interface is obtained by using the area weighted technique.Furthermore,the method of computing the water invasion rate on the gas-water interface and cumulative water influx that intrudes into gas reservoir is established by applying the Duhamel principle.The typical curve of transient water invasion in the triple porosity gas reservoir with bottom-water is plotted by means of the numerical inversion,the process of bottom water invasion is divided into six sections,including the early linear flow of fracture system,radial flow of fracture system,the channeling flow from cave system to fracture system,the radial flow of fracture and cave system,the channeling flow from matrix system to fracture system and the radial flow of the whole system.The influence on transient water invasion mechanism is analyzed such as aquifer size,interstitial physical-property parameters,the ratio of the horizontal permeability and vertical permeability,production system and so on.The methods and results of this research contribute to reasonable analyses on the dynamic characteristics of water invasion and optimization of the preventing water development plan of the triple porosity gas reservoir with bottom-water.

Key words： Triple porosity gas reservoir; Gas reservoir with bottom-water; Transient water invasion; Seepage model; Cumulative water influx

Cite this article

FAN Huai-cai，ZHONG Bing，LIU Yi-cheng，YANG Xue-feng，FENG Xi，DENG Hui . Studies on Transient Water Invasion Mechanism of the Triple Porosity Gas Reservoir with Bottom-water[J]. Natural Gas Geoscience, 2015 , 26(3) : 556 -563 . DOI: 10.11764/j.issn.1672-1926.2015.03.0556

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