Two-section separation based SAGD produced fluid treatment method and device

Abstract

The invention relates to the technical field of SAGD circulating preheating stage produced fluid treatment, in particular to a two-section separation based SAGD produced fluid treatment method and device. The method is characterized in that high-pressure under-pressure separation and low-pressure flash-evaporation separation are performed on the SAGD produced fluid, and follow-up treatment is thenperformed. A secondary gas-liquid separating process of under-pressure separation and flash-evaporation separation is adopted, wherein the first stage is under-pressure gas-liquid separation with relatively high control pressure, and is mainly used for separating a gas phase carried in the produced fluid, and stabilizing the front end pressure of a collecting and transport system; and the secondstage is used for performing flash-evaporation separation on a first liquid phase, wherein the control pressure is relatively low, the produced fluid is sufficiently subjected to flash-evaporation, the liquid phase is partially gasified and cooled in a flash-evaporation process, and heat exchange difficulty of the liquid phase is greatly reduced; and meanwhile, the gasified gas phase can adopt a more mature gas-liquid heat exchange system, and heat exchange efficiency is higher, so that the SAGD produced fluid is lower in treatment cost.

Description

technical field

[0001] The invention relates to the technical field of production fluid treatment in the SAGD cycle preheating stage, and relates to a SAGD production fluid treatment method and device based on two-stage separation. Background technique

[0002] Steam-assisted gravity drainage (SAGD) is a cutting-edge technology for developing super-heavy oil at home and abroad. Using SAGD technology to exploit heavy or super-heavy oil can greatly increase the recovery factor. The SAGD production cycle includes two stages: cycle preheating and normal production. The SAGD cycle preheating stage usually lasts for 3 to 6 months. After the steam cavity is connected, it will enter the normal production stage.

[0003] From 2009 to 2009, Xinjiang Oilfield successively put into operation two test areas of Zhong 32 and Zhong 37, a total of 12 pairs of SAGD well groups. During this period, the development of SAGD in Xinjiang Oilfield was in the pilot test stage, and the ground techno...

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