Optimization Design for Conformance Control Based on Profile Modification Treatments of Multiple Injectors in a Reservoir

Abstract

Within the past 40 years, profile modification has been widely used in China to control excess water production and improve waterflood sweep efficiency. As most reservoirs reach mature stage, single well treatment often becomes uneconomic. Therefore, profile modification treatments of multiple injectors based on reservoir scale have been applied to improve reservoir conformance. In this paper, a method is introduced to optimize the design of the treatment. The selection of the wells and target layers, as well as the chemical agent and injection parameters can be achieved by this method. The selection of candidate wells is based on fuzzy mathematics methods, considering well injectivity, reservoir heterogeneity and offset production well performance. The chemical agent is selected from over 40 formula commonly used in China, according to its compatibility with reservoir characteristics and well injectivity. The volume of treatment is optimized by running numerical simulations. This optimization method has been widely used in many oilfields in China. In most cases, production analysis after treatment shows that the waterflood. efficiency is improved, and that the model predictions match well with the actual production data. As an example, a detailed analysis of the treatment performed in the Long 11 fault-block reservoir in Qing Long Tai oilfield is given in the paper.

Meeting Name

SPE International Oil and Gas Conference and Exhibition in China (2000: Nov. 7-10, Beijing, China)

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Multiple Injectors; Reservoir Simulations; Computer Simulation; Computer Software; Costs; Floods; Injection (Oil Wells); Mechanical Permeability; Numerical Analysis; Oil Wells; Water; Petroleum Reservoirs

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2000 Society of Petroleum Engineers (SPE), All rights reserved.

Publication Date

01 Nov 2000

Link to Full Text

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