Optimal Objective Function Processing Method for Oil-Water Relative Permeability of Low-Permeability Reservoirs

doi:10.3969/j.issn.1006-6535.2022.01.013

Abstract

Abstract: For heterogeneous and hydrophilic cores with permeability,the relative permeability curve was obtained from the non-stationary experimental data by the conventional JBN method, and there were some anomalies such as "humps" in the water relative permeability curve caused by calculation failure. In addition to experimental factors such as heterogeneity of rock samples,early water breakthrough at the outlet, inappropriate displacement velocity,and difficulties in determining the oil-water viscosity ratio, the limitation of conventional methods such as JBN in processing the experimental data of unsteady water-oil displacement is the root cause for the abnormal shape of the relative permeability curve.To solve the above problems,an oil-water seepage model of low-permeability reservoir was established considering the effect of capillary force.The experimental data of oil-water relative permeability were processed by automatic historical fitting method, and the effects of different methods on the oil-water relative permeability of low-permeability core were compared and analyzed.The results showed that, compared with the JBN and Jones methods, the automatic history fitting method for oil-water relative permeability in low-permeability reservoir based on the optimal objective function was advantaged by smooth curve and obvious rules,and reduced the errors in the calculation of relative permeability in low-permeability reservoir to the greatest extent; when capillary force was considered,the results obtained by the three methods were that the oil relative permeability was increased,the water relative permeability was basically unchanged, and the automatic history fitting method reflected the trend of oil relative permeability in a more reasonable and uniform way.The automatic history fitting method overcame the limitations of conventional methods such as JBN,with better applicability,providing important parameters for subsequent numerical simulation and other studies.

Key words: low-permeability reservoir, oil-water relative permeability, capillary force effect, automatic history matching

CLC Number:

TE348

Cui Jian, Shen Guihong, Shang Lin, Sun Yanchun, Gong Lirong, An Yi. Optimal Objective Function Processing Method for Oil-Water Relative Permeability of Low-Permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 85-90.

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