SAGD (steam assisted gravity drainage) thick oil dehydration method

A technology of heavy oil and electric dehydrator, which is applied in the fields of dehydration/demulsification of hydrocarbon oil, dehydration/demulsification of chemical method, petroleum industry, etc. Loss of dehydration effect and other issues, to achieve the effect of small footprint, airtight process, high dehydration efficiency

Inactive Publication Date: 2021-06-25
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology provides an improved way for treating crude oils that contain water or other impurities during production processes. It involves combining these materials together before heating them up again into more pure form without losing any valuable material like hydrocarbons. By doing this, it allows for better quality products while reducing costs associated therewith.

Problems solved by technology

This patented technical problem addressed by this patents relates to developing an improved method for treating crudes containing sulfur compounds such as bitumen or shale during exploration drilling operations on deep sea offshore platforms due to their low water content compared to traditional methods like thermal desorption techniques involving distillations. Current methods involve multiple stages of processing before final product quality suffers from reduced hydrating efficiency caused by increased solvent use.

Method used

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  • SAGD (steam assisted gravity drainage) thick oil dehydration method
  • SAGD (steam assisted gravity drainage) thick oil dehydration method
  • SAGD (steam assisted gravity drainage) thick oil dehydration method

Examples

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Embodiment

[0037]Water-containing heavy oil (1.45MPaG, 197°C) from the well site is cooled to 135°C by the crude oil / ethylene glycol heat exchanger, mixed with the diluent from the diluent storage tank, and then enters the three-phase separator for oil-gas separation and thermochemical Dehydration, the operating pressure of the thermochemical three-phase separator is 1.15MPaG, the operating temperature is 125°C, and the liquid phase residence time is 40min. 0.90MPaG, the operating temperature is 120°C, and the residence time is 90min. After degassing, the qualified crude oil (water content≤0.5%) enters the flash tank for degassing. The operating pressure of the flash tank is 0.30MPaG, and the operating temperature is 94°C. Meet the requirements of saturated vapor pressure. The qualified crude oil after degassing passes through the qualified crude oil / ethylene glycol heat exchanger and enters the crude oil storage tank for storage; the natural gas extracted from the thermochemical three-

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Abstract

The invention provides an SAGD (Steam Assisted Gravity Drainage) thick oil dehydration method. The method can meet the treatment requirements of asphalt oil and associated gas in small oil sand development. The dehydration process implemented by the method mainly comprises the steps of diluent mixing, oil-water separation, flash evaporation and diluent recovery. Thick oil and a diluent are mixed and then subjected to three-stage treatment including thermochemical dehydration, electric dehydration and flash evaporation, the water content of crude oil can meet the requirement of being lower than 0.3%, and the saturated vapor pressure of the crude oil is qualified. Light components obtained by flash evaporation can be recycled as a diluent after being condensed and recovered, so that the consumption of the diluent is reduced. The technological process provided by the method is flexible and compact, the occupied area is small, equipment can be repeatedly utilized, and the method has great value for rolling type development of oil sand marginal reserves.

Description

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Claims

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Application Information

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Owner CHINA NAT OFFSHORE OIL CORP
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