Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 180-188.doi: 10.12108/yxyqc.20210219

• PETROLEUM ENGINEERING • Previous Articles    

Re-discussion on principle of constant porosity during primary deformation of rock

ZHU Suyang1, LI Dongmei2, LI Chuanliang1, LI Huihui2, LIU Xiongzhi3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610599, China;
    2. Completion and Well Test Management Center, Sinopec Northwest Oilfield Company, Luntai 841600, Xinjiang, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2020-07-16 Revised:2020-09-03 Online:2021-04-01 Published:2021-03-31

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Abstract: In the primary deformation of reservoir rocks,the assumption that the shape of the skeleton particles remains unchanged assumes that the porosity of the rocks remains unchanged during the compression process. However,the shape of the skeleton particles does not strictly remain unchanged. In order to study the influence of the shape change of skeleton particles on porosity,based on the elastic deformation model,finite element numerical simulation method was used to study the deformation of skeleton particles and its influence mechanism on porosity during the primary deformation of porous media. The results show that the displacement of skeleton particles is small in the constraint direction(particle contact position),and it is larger in the unconstrained direction (pore position),which changes the shape of the particles,reduces the porosity of rock. However,the young's modulus of rock minerals is larger,and the constraint conditions of the rock skeleton particles are more demanding than those in numerical experiments. Therefore,the effect of skeleton particle deformation on porosity is very weak. In the numerical experiments,rigid epidermis has only a certain effect on the initial porosity value. However,the flexible skin in the core gripper has a great influence on the measurement process,which is the direct cause of the great change of porosity in the experiment. Therefore,in the process of reservoir production, the deformation process of rock can still be considered to follow the "porosity invariance principle".

Key words: rock skeleton, porosity, primary deformation, constrained deformation, numerical simulation, skin effect

CLC Number: 

  • TE349
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