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Results of Two Polymer Flooding Pilots in the Central Area of Daqing Oil Field
Demin Wang (Daqing Petroleum Administration Bureau) | Yuexing Hao (Daqing Petroleum Administration Bureau) | Eric Delamaide (Inst. Francais du Petrole) | Zhonggui Ye (Daqing Petroleum Administration Bureau) | Si Ha (Daqing Petroleum Administration Bureau) | Xiangcheng Jiang (Daqing Petroleum Administration Bureau)
Abstract
Two polymer pilot tests (PO and PT) have been performed in the Central Area of Daqing Oil Field. The purpose is (1) to study further the economic benefits of polymer flooding in thick heterogeneous reservoirs, (2) to provide some technical and practical experiences for expanding this technique to other areas of Daqing Oil Field. During the polymer pilot tests, a large amount of performance information ( such as injection pressure, injection profiles, C/O logging, tracer tests, core data from inspection wells, salinity of effluent fluid as well as the concentration and viscosity of polymer solution in the injected and produced fluids etc. ) were collected. In this paper, the results of the polymer flood were evaluated comprehensively by analysing the information. Good results were obtained in the polymer pilot tests. The volumetric sweep efficiency and oil production were all increased. Incremental oil production is more than 200 tons per ton of polymer injected. Oil recovery increased more than 11 % of OOIP. All of these confirm that polymer flooding is very applicable to Daqing Oil Field. In the course of evaluating the results, follow-up matching and result prediction of the polymer flood were performed by numerical simulation. In order to obtain the best economic results, when executing the design or adjusting the project, a new “normalized method” was developed. By applying this method, the results of polymer flooding were evaluated at different stages. This paper demonstrates the effect of Dykstra Parsons permeability coefficient (Vk) on polymer flooding results and presents a optimum range of the Vk value applicable for polymer flooding in Daqing Oil Field. The relationship of the amount of polymer injected versus economic results and the polymer flooding result in multi-layer reservoirs are also discussed and opinions are given. All of these are important to later project design and result evaluation of polymer flooding in Daqing Oil Field.