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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 5185360, 5 pages
https://doi.org/10.1155/2017/5185360
Research Article

Evaluation Method of Reservoir Producing Status Based on Cumulative Distribution Curve of Oil Displacement Efficiency

1Research Institute of Enhance Oil Recovery, China University of Petroleum, Beijing 102249, China
2Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
3Chinese Academy of Engineering, Beijing 100088, China

Correspondence should be addressed to Cuo Guan

Received 15 February 2017; Accepted 28 May 2017; Published 4 July 2017

Academic Editor: Anna Pandolfi

Copyright © 2017 Cuo Guan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper provides a method for evaluating the status of old oilfield development. This method mainly uses the abundant coring well data of the oilfield to obtain the cumulative distribution curve of the displacement efficiency after the displacement efficiency of the statistical wells in the study area in a similar period is ordered from small to large. Based on the cumulative distribution curve of displacement efficiency, combined with the reservoir ineffective circulation limit, the cumulative water absorption ratio of reservoirs and other data are used to study the reservoir producing degree, calculate the degree of oil recovery, evaluate the proportion of the remaining movable oil after water flooding, calculate the reservoir ineffective circulation thickness and ineffective circulation water volume, and so on.