Simulation of mud invasion and analysis of resistivity profile in sandstone formation module

FAN Yiren; WU Zhenguan; WU Fei; WU Junchen; WANG Lei

doi:10.11698/PED.2017.06.18

Petroleum Exploration and Development >

2017 , Vol. 44 >Issue 6: 989 - 996

DOI: https://doi.org/10.11698/PED.2017.06.18

COMPREHENSIVE RESEARCH

Simulation of mud invasion and analysis of resistivity profile in sandstone formation module

FAN Yiren ,
WU Zhenguan ,
WU Fei ,
WU Junchen ,
WANG Lei

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1. School of Geosciences in China University of Petroleum, Qingdao 266580, China;
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
3. CNPC Key Laboratory for Well Logging, China University of Petroleum, Qingdao 266580, China;
4. Suzhou Niumag Analytical Instrument Corporation, Suzhou 215163, China

Received date: 2017-06-15

Revised date: 2017-10-25

Online published: 2017-11-24

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Abstract

Aiming at the dynamic invasion process of drilling fluid, the parameters of the physical model in laboratory were optimized based on numerical simulation and then a physical simulation system for mud invasion in undisturbed zone was developed. Then, the experiment of fresh water invasion in sandstone formation was conducted to measure the radial resistivity and mudcake parameters over time, and a mudcake porosity and permeability calculation model with the invasion time was proposed based on the measurement. Finally, the numerical simulation results were compared and calibrated with the physical simulation results to find out the regularity of drilling fluid invasion under formation conditions. The results show that the mudcake forms quickly and the porosity and permeability of the mudcake decrease sharply after the beginning of drilling fluid invasion, and the invasion process is mainly controlled by the mudcake after a certain period. The mudcake parameters model developed in this study can depict the changes of mudcake parameters during the invasion process. The characteristics of radial resistivity profile under mud invasion are affected by sandstone physical properties, mudcake parameters and formation water salinity.

Key words： mud invasion; physical modeling; numerical simulation; mudcake; resistivity; porosity; permeability

Cite this article

FAN Yiren , WU Zhenguan , WU Fei , WU Junchen , WANG Lei . Simulation of mud invasion and analysis of resistivity profile in sandstone formation module[J]. Petroleum Exploration and Development, 2017 , 44(6) : 989 -996 . DOI: 10.11698/PED.2017.06.18

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