New Calculation Methods of Injection-production Ratio for
Water-injecting Development Stage in Closed Reservoirs

doi:10.11885/j.issn.1674-5086.2013.06.30.01

Abstract

Abstract:

At present，the calculation methods of stage injection-production ratio only considered a single factor，such as
formation pressure or water cut；however，the stage injection-production ratio is controlled by many factors，such as formation
pressure，water cut and cumulative water-oil production ratio in real development. To solve the problem，we derived the
relationship formulation of stage injection-production ratio with cumulative oil production，formation pressure and water cut
using the semi-logarithmical curve of cumulative water injection with cumulative oil production，combining the material balance
equation of closed reservoir. Then two calculation formulations of stage injection-production ratio were further derived using
the relationship formulation of cumulative oil production with water saturation and the two relationship formulations of relative
permeability with water saturation. At the end，calculations of stage injection-production ratio using the above two calculation
formulations for an example closed reservoir with water-injection development history showed that the new calculation methods
are applicable and useful.

Key words: closed reservoir, water injection, stage injection-production ratio, water cut, relative permeability

Jia Yinglan1，2, Jia Yonglu1, Zhou Xia3, Jing Yang4, Nie Renshi1. New Calculation Methods of Injection-production Ratio for
Water-injecting Development Stage in Closed Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.06.30.01.

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