This study investigates the sandpack displacement of low viscosity oil (1.68 cP) by brine and aqueous solutions of associative polymers. Polymer flooding has been thoroughly investigated in many laboratory and field tests. Polymer flooding is one of the most widely used enhanced oil recovery (EOR) methods. The method of polymer flooding is not used for development of oil fields with gas caps, fractured reservoirs, high permeability and active bottom-water drive. In the application of polymer flooding, coefficient of oil recovery is increased by 3-10%. Hydrolyzed polymers undergo the significant thermal and chemical degradation at high temperature and salinity. In recent years, researchers have turned their attention to associative polymers. An application of associative polymers to withstand degradation in high temperature and high salinity conditions can enhance oil recovery in high heterogeneous fields. This article presents the results of studies of oil displacement by associative polymers in a two-layer core model. In laboratory studies, the core selected from a sandy reservoir of the South Turgay Basin of the Republic of Kazakhstan was used. Solutions of the following polymers were studied: hydrolyzed polyacrylamide (HPAM) and associative polymer. The physicochemical conditions of the experiments corresponded to the reservoir conditions of the sand layer of the South Turgay Basin: temperature of 82 °C and the salinity of the brine 92,000 ppm. Experiments revealed that the associative polymer is more stable in simulated reservoir conditions than the HPAM polymer. Associative polymer flooding was recommended for pilot testing at the reservoir of the South Turgay Basin.
This paper outlines implementation results of pilot polymer flooding project in the South Turgay basin's field in Kazakhstan. During pilot injection, production data and main parameters were gathered and analyzed.In the paper contains description of general information about selection of the appropriate reservoir area, including geology, water quality and other main parameters for the best polymer selection. Based on screening of these parameters an area was selected for pilot polymer flooding implementation. Polymer flooding carried out using two injection wells.After continuous injection, according to injection protocol, initial watercut decreased in the oil production of producing wells due to improvement in the reservoir sweep efficiency caused by flooding. Bottomhole pressures and injection rates in the injection wells varied insignificantly. Oil production increased comparing with the standard water flooding process that was applied initially.Oil production was monitored and analyzed by Operator Company since the begging of the injection. Production history from the beginning of pilot polymer flooding project demonstrates efficiency of this EOR method. Considering positive results of this injection stage Operating Company plans to continue polymer solution injection in the next stages of the field developmet.
Purpose of this report to inform the petroleum readership of recent advances in areas of the associative polymer flooding. Polymer flooding is the industrial enhanced oil recovery method, which successfully has applied in various types of reservoirs. The polymer flooding for high-temperature and high-salinity reservoir faces enormous challenges. Hydrolyzed polymer has been used as the main polymer type for the polymer flooding. Now researchers have turned their attention to associative polymer solutions. This report presents an overview of the associative polymer flooding. Some recent projects have shown an expanding technology. This report reviews published results of the use of associative polymers to enhance oil recovery in recent years. The associative polymer flooding is one enhanced oil recovery (EOR) method being developed recently to increase the oil supply. Polymer flooding application in high-temperature and high-salinity reservoirs is currently limited by polymers chemically and thermally degradation at high temperature and salinity. The associative polymer solutions improve the over-all reservoir conformance by providing mobility control. Water is injected after the polymer solution. Based on the number of new laboratory and pilot tests, field activity is continuing at a moderate level.
Background: Increasing the efficiency of a polymer flooding project, both technologically and economically, is always relevant. Aim: This paper aims to consider switching to less saline water as a fairly simple and effective way to increase the effectiveness of a polymer flooding project. Materials and methods: The work used data from a real polymer flooding project. Results: As a result, we have been able to significantly reduce polymer consumption and improve pumping efficiency. Conclusion: This work shows that, with the possibility of using less saline water, as a simple and effective way to reduce costs and increase efficiency, rolling polymer flooding.
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