西南石油大学学报(自然科学版)

   

Evaluating the Seepage Characteristics of Unconsolidated Sandstone Gas
Reservoir by Digital Core

Wang Xiaolu1,2*, Liu Hong3, Pang Jin3, Zhou Jin4, Hua Qing5   

  1. 1. State Key Laboratory of Oil and gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;
    2. Qinghai Oilfield Natural Gas Development Company,PetroChina,Golmud,Qinghai 816000,China;
    3. School of Petroleum and Natural Gas Engineering,Chongqing University of Science and Technology,Shapingba,Chongqing 401331,China;
    4. Northwest Sichuan Gas Field of Southwest Oil & Gas Field Branch,PetroChina,Jiangyou,Sichuan 621700,China;
    5. Chongqing Gas Field of Southwest Oil & Gas Field Branch,PetroChina,Jiangbei,Chongqing 400021,China
  • Online:2015-04-01

Abstract:

To solve the problems of hard coring,easy hydration for core and sand production during the test of physical
properties of rock in unconsolidated sandstone gas reservoir,We carried out the study of the seepage characteristics by digital
core technology while the traditional core displacement experiment cannot evaluate its seepage characteristics precisely. Based
on the core of a well in Sebei unconsolidated sandstone gas reservoir,firstly,we scan the core samples to get their 3D images
with CT scanner,and extract digital information,put the pore structure to directly map onto the network model,establish the
digital core and extract the 3D pore network model from it according to the fractal principle. And then,we put the model
calculation results and real core experimental results in comparison and correction,and get the effective model of digital core.
Finally,use this model of digital core to calculate the physical seepage parameters and relative permeability in various states
of effective stress,formation water damaging time and shale content so that it could provide important basic data physical of
rock for the unconsolidated sandstone gas reservoir development.