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Rapid dehydration method for low-temperature sealed interface of produced liquid in oil field central treatment station and device for implementing method

A centralized treatment and rapid dehydration technology, which is applied in the direction of hydrocarbon oil dehydration/demulsification, dehydration/demulsification by chemical methods, and only multi-stage serial refining process treatment, etc., can solve the problem of high dosing concentration of demulsifier and long dehydration time , high dehydration temperature and other issues, to achieve significant environmental benefits, reduce dosing concentration, and reduce the effect of dehydration temperature

Inactive Publication Date: 2019-06-07
XINJIANG KELI NEW TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method and device for rapid dehydration of the low-temperature airtight interface of the produced fluid in an oilfield centralized treatment station, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems of high dehydration temperature and broken water in the existing oilfield produced fluid treatment technology. The problems of high dosing concentration of emulsion, long dehydration time and high operating cost

Method used

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  • Rapid dehydration method for low-temperature sealed interface of produced liquid in oil field central treatment station and device for implementing method
  • Rapid dehydration method for low-temperature sealed interface of produced liquid in oil field central treatment station and device for implementing method

Examples

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Effect test

Embodiment 1

[0021] Embodiment 1: The rapid dehydration method of the low-temperature airtight interface of the oilfield centralized treatment station produced fluid is carried out according to the following method: the first step, the oilfield produced fluid enters the three-phase separator 1, and passes through the three-phase separator 1 to divide and eliminate After foaming, coalescence, vortex elimination and demist purification, dry gas, water-containing crude oil and water are obtained respectively. The dry gas is discharged from the gas outlet. Due to the density difference between water-containing crude oil and water and its own gravity, the water sinks to the three-phase separator 1 The bottom is discharged through the water outlet of the three-phase separator 1, and the water-containing crude oil floats on the top of the three-phase separator 1, and is discharged to the steam phase change heating furnace 2 through the oil outlet of the three-phase separator 1; in the second step, ...

Embodiment 2

[0024] Example 2: As an optimization of the above example, in the second step, the dehydration temperature is 28° C. to 32° C., and the mixing ratio of the demulsifier to the aqueous crude oil is 50 mg of the demulsifier per liter of aqueous crude oil.

Embodiment 3

[0025] Example 3: As an optimization of the above example, the strongly lipophilic and hydrophobic interface active material has a contact angle with oil of 3° to 5°, and a contact angle with water greater than 148°.

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Abstract

The invention relates to the technical field of produced liquid treatment in oil field central treatment stations, and relates to a rapid dehydration method for a low-temperature sealed interface of aproduced liquid in an oil field central treatment station and a device for implementing the method. The method is characterized in that after an oil phase, a gas phase and a water phase in the produced liquid are separated by adopting a three-phase separator, after water-containing crude oil is heated to a dehydration temperature by a steam phase change heating furnace, rapid dehydration is performed in a fast closed dehydrator, and therefore settling separation of the crude oil is realized; and the device is characterized by comprising the three-phase separator, the steam phase change heating furnace, the interface fast closed dehydrator and an oil-water sedimentation separator. According to the process provided by the invention, the device is simple and convenient, an oil-water interface film is rapidly broken by the interface fast closed dehydrator, oil beads are aggregated, water beads are coalesced, oil transaction indexes of rapid oil-water separation and a water content of lessthan 0.5% are achieved, so that the purposes of a reduced dehydration temperature, a reduced concentration of an added demulsifying agent, and shortened dehydration time are realized; and associatedgases are not discharged to the outside, so that the method and the device have significant environmentally-friendly, social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of production fluid treatment in an oilfield centralized treatment station, and relates to a method and device for rapid dehydration of a low-temperature airtight interface of a production fluid in an oilfield centralized treatment station. Background technique [0002] Oilfield produced fluids belong to thermodynamically unstable systems, mainly W / O, O / W, O / W / O and other complex systems, with high comprehensive water content, and its demulsification and dehydration mechanism is liquid bead aggregation-oil-water interface film rupture ( Membrane drainage)—Water droplets coalesce and settle, and the rupture of the oil-water interface film is the key to demulsification. The viscosity, strength, and thickness of the interfacial film determine whether the interfacial film can rupture rapidly. With the advancement of crude oil recovery process, the water content of the produced fluid gradually increases from low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/00C10G33/04C10G53/02
Inventor 周少雄朱卫权周强强卜魁勇李琴琴叶洋王殿舒雷江辉王良胜段雄峰尹虽子陈贤
Owner XINJIANG KELI NEW TECH DEV
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