Thermal mining system of marine heavy oil field and mining method

Abstract

The invention discloses a thermal mining system of a marine heavy oil field and a mining method. The system comprises a seawater desalination subsystem, a steam preparation subsystem, a steam injection subsystem and an oil / gas production subsystem, and the steam preparation subsystem, the steam injection subsystem and the seawater desalination subsystem are arranged on a fixed or floating marine production platform. The method comprises seawater desalination, steam preparation, steam injection and oil / gas production. By adopting the integrated system with the seawater desalination device, the marine steam preparation device, the steam injection device and a marine mining device, the problems of marine freshwater sources and steam preparation can be solved, and basic conditions can be provided for thermal mining of marine heavy oil and steam. Due to the adoption of the flexible fuel supply and a burner with a wide scope of application, convenience is provided for marine steam preparation. Moreover, the economic performance of thermal mining of marine heavy oil and steam can be greatly improved.

Description

technical field [0001] The present invention relates to a combined thermal exploitation system and exploitation method of an offshore heavy oil field, involving thermal development technology of heavy oil field, seawater desalination technology, steam or hot water preparation technology, steam or hot water injection technology, oil and gas treatment and storage and transportation technology, etc. . Background technique [0002] Crude oil from some offshore oil fields is heavy crude oil with an API gravity below 22. Currently, there are two main methods of mining heavy oil: thermal drive and chemical drive. The main principle of the thermal drive method is to use steam or hot water to heat and dilute crude oil, thereby reducing the viscosity of crude oil. Thermal driving methods mainly include steam stimulation method, steam driving method, steam-assisted gravity oil recovery method, etc. The essence of the chemical drive method is to use chemical methods to reduce the vis...

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Problems solved by technology

Due to the lack of fresh water at sea, and the need for combustion and pollution control systems for steam preparation, these equipment often occupy a large area, which brings certain difficulties to sea steam preparation

[0004] US Patent US 20100243246A1 discloses "WATER INJECTION SYSTEMS AND METHODS" (water injection system and method), which uses desalinated seawater to inject oil reservoirs for secondary recovery, and does not consider heating desalinated water into steam for thermal recovery

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