The Vietnam Petroleum Institute (VPI) is implementing a multi-task national level project entitled “Research, evaluate, select and develop a pilot programme for industrial application of solutions to improve oil recovery coefficient for clastic oil bearing reservoirs of oil fields in the Cuu Long basin, on the continental shelf of Vietnam”. Specifically, detailed evaluation studies have been carried out from geological characteristics, reservoir engineering, production to EOR mechanism to develop technical criteria for the process of manufacturing and evaluating the efficiency of the chemical system to optimise the laboratory scale, propose the production and injection scenarios to optimize the development plan as well as evaluate the efficiency of increasing oil recovery coefficient on the reservoir simulation model; conduct production at pilot scale and implement industrial application testing on the field scale for clastic oil bearing reservoir, Cuu Long basin.
The article presents the results of research, evaluation, selection and successful manufacture of a VPI SP chemical system based on the combined mechanism of anionic - non-ionic surfactants and polymers to ensure satisfying the harsh technical requirements of oil fields in Vietnam such as resistance to high temperature, high pressure, high mineralisation, very low surface tension, optimal micro-emulsion, low adsorption onto reservoir rocks, reducing residual oil saturation in the reservoir. Results of the evaluation of increased efficiency of oil recovery on actual samples of Miocene reservoir showed an increase of over 21%. The VPI SP chemical system has been included in the plan of industrial-scale testing by Vietsovpetro in Bach Ho and other producing fields in the clastic sections of the Cuu Long basin.
The petroleum production simulation model is a reliable and commonly used tool by petroleum engineers in field operation and management. Production history matching is a vital link while building and completing the simulation model such that it accurately reflects reservoir behavior. In addition to the methods such as direct modification and automatic/assisted history matching, the authors propose a solution to improve the efficiency of history matching by applying the results of nonlinear signal processing methods and data point mapping method through interpolation algorithm. The method is applied for 3 water injection wells, 10 production wells at Miocene reservoir of the water flooding field X in Cuu Long Basin. The results show that the water-cut parameter of 7/10 production wells really improved in comparison to the initial model. The error of oil and liquid cumulative production in the simulation model compared to reality data respectively decreases from -2.8% to -0.3% and from +11.7% to less than 5%.
Enhanced oil recovery (EOR) implementation at field scale is complex. Therefore, pilot applications are usually conducted before field execution. This paper introduces a pilot project successfully applied for the Lower Miocene, Bach Ho field. Topics covered include: (i) pilot area selection, (ii) chemical preparation, (iii) specification and pilot design for execution, (iv) implementation, (v) pilot observation and interpretation, (vi) efficiency evaluation. The implementation of pilot projects is achieved on 23 January 2022. The evaluation shows that 2,700.2 tons of oil gained thanks to the application of the surfactant-polymer complex mixture (VPI SP).
This paper introduces the process of optimising the pilot-scale production of an EOR chemical system for trial industrial application based on laboratory testing results, the results of evaluating EOR efficiency on Miocene reservoir samples taken from Bach Ho field and the results of the chemical injection test on the reservoir dynamic model for wells 1605 and 1609 in the southern part of Bach Ho field. The main components of the surfactant chemical systems consist of sodium olefin sulfonate (SOS), alkyl aryl sulfonate (AAS), sodium dodecylbenzene sulfonate (SDBS)and nonylphenol ethoxylate (NPEO), which were improved by minimising interfacial tension (IFT), increasing the ability to form micro-emulsions as well as resistance to temperature and high mineralisation/salinity. The polymer composition of the chemical system was improved by increasing the viscosity and reducing the mobility of the injected fluid system to increase the sweep coefficient.
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