Simulation of Damage Zone Due to Lost Circulation of Drill-in Fluid in#br#
Fractured Tight Reservoirs

doi:10.11885/j.issn.1674-5086.2013.08.11.01

Abstract

Abstract:

The invasion of drill-in fluid into reservoir formation can lead to a damage zone around the wellbore during the process
of over balanced drilling and completion in fractured tight reservoirs，which will strongly affect the production performance
of a well. Taking the tight conglomerate reservoir of Jiulongshan structure as the research object，the mathematical model of
solute transport in fractured network was established by double continuous medium method；the dimensionless concentration at
any time in different position from wellbore was determined by using finite difference method to solve the developed model；the
extent of formation damage caused by drill-in fluid loss was quantitatively evaluated，and the numerical results were validated
by pressure built-up test analysis and dynamic damage assessment of drill-in fluid. The numerical results show that the depth
of drill-in fluid invasion increases over time，and pollutions induced by the drilling fluid loss continuously push and cumulate
in depth of the formation with the kill fluid loss；respectively，the radius and equivalent skin factor of damage zone due to lost
circulation of drill-in fluid is about 17.0 m and 7.5，the relative errors between the numerical results and the results of pressure
built-up test analysis and dynamic damage assessment are less than 10%，which proves the reliability of the model.

Key words: tight sandstone, fracture, drill-in fluid, lost circulation, solute transport

CLC Number:

TE258

Kang Yili1*, Huang Fansheng1, You Lijun1, Xu Chengyuan1, Mi Guangyong2. Simulation of Damage Zone Due to Lost Circulation of Drill-in Fluid in#br# Fractured Tight Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.08.11.01.

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Simulation of Damage Zone Due to Lost Circulation of Drill-in Fluid in#br# Fractured Tight Reservoirs

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