Dissolved oxygen control specifics in ASP project

UDK: 622.276 ©
DOI: 10.24887/0028-2448-2018-1-66-71
Key words: dissolved oxygen, chemical oxygen scavenging, nitrogen blanketing, amperometrical method, polymer stability
Authors: S.I. Erke (Salym Petroleum Development N.V., RF, Moscow), M.Yu. Kostina (Salym Petroleum Development N.V., RF, Moscow), M.Yu. Bondar (Salym Petroleum Development N.V., RF, Moscow), M.Yu. Shuster (Salym Petroleum Development N.V., RF, Moscow), V.M. Karpan (Salym Petroleum Development N.V., RF, Moscow)

Salym Petroleum Development N.V. is executing a Pilot project associated with experimental injection of ASP (alkali, anionic surfactant, and polymer) solutions into the reservoir to enhance oil recovery. Pilot ASP flooding project means using high-quality chemicals and specially treated water with specific quality. Polymer solution stability and target properties strongly depend on hardness divalent cations, iron and dissolved oxygen presence in water. To avoid oxygen effect set of actions is implemented both for direct current dissolved oxygen concentration reducing and avoid oxygen ingress during operation: commodities unloading, mixing with water and dissolution. Chemical dissolved oxygen scavenging was selected as the most effective in terms of reactivity and cost reduction. Nitrogen blanketing for volumetric equipment (all vessels and tanks) is being used to oxygen ingress avoid. As critical parameter dissolved oxygen concentration in water and solutions control is being controlled both by online industrial instruments and laboratory instruments based on the amperometric method selected as one of more applicable for measurements in multi-components water solutions and special express tests visual kits. This paper focused on all activities on the fight with oxygen during West Salym ASP pilot project from definition of the oxygen presence criticality, methods of removal and control for future ASP projects.


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