Predict Injection Profile of an Injector using a Soft Computing Method

Abstract

Knowing the injection profile of each injector in a reservoir is of major importance for analyzing residual oil distribution underground. However, in practice, it is impossible to acquire real-time injection profiles for each well when they are needed. In this paper, a two-step learning fuzzy system was introduced to predict injection profiles for wells with outdated data or without data by analyzing those injectors whose injection profiles are well characterized. Five pivotal parameters were selected to be fed into the subtractive clustering algorithm and ANFIS (adaptive-network-based fuzzy inference system) to model their non-linear relationships with the injectivity of each producing layer. Experiments in comparing the two-step method and the backpropagate feed-forward (BPFF) neural network showed that the two-step method can automatically generate a more simply structured fuzzy inference system (FIS) and can simulate complicated numerical nonlinear relationships with higher accuracy. This method was used in injection profile prediction in one block of the Daqing oilfield. The average accuracy was shown to be above 80%.

Meeting Name

11th ADIPEC: Abu Dhabi International Petroleum Exhibition and Conference (2004: Oct. 10-13, Abu Dhabi, United Arab Emirates)

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Backpropagate Feed-Forward (BDFF); Fuzzy Inference Systems (FIS); Injectors; Soft Computing Method; Algorithms; Backpropagation; Computational Methods; Feedforward Neural Networks; Fuzzy Sets; Learning Systems; Mathematical Models; Mechanical Permeability; Oil Fields; Sand; Water Injection; Injection (Oil Wells)

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 Society of Petroleum Engineers (SPE), All rights reserved.

Publication Date

01 Oct 2004

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