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Novel demulsification method for crude oil produced liquid

A technology for producing fluid and demulsification, which is applied in the fields of chemical dehydration/demulsification, petroleum industry, processing of hydrocarbon oil, etc., and can solve the problem of less improvement in process methods.

Active Publication Date: 2021-09-10
江苏诺盟氢能技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The demulsification of the existing oil production fluid mainly realizes oil-water separation by adding an appropriate amount of demulsifier to the on-site production fluid and settling for a few hours or more than ten hours. Therefore, a lot of research work has been carried out around the synthesis and formulation of demulsifiers. For example, the chain extension and cross-linking of traditional demulsifiers in the molecular structure or compounding to make full use of the synergistic effect between demulsifiers to obtain higher interfacial activity, stronger flocculation and coalescence capabilities, while the crude oil recovery The improvement of liquid demulsification process is less

Method used

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  • Novel demulsification method for crude oil produced liquid
  • Novel demulsification method for crude oil produced liquid
  • Novel demulsification method for crude oil produced liquid

Examples

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Effect test

preparation example Construction

[0028] Preparation of emulsified crude oil: When the time interval between crude oil production and liquid sampling is long, the mixed sample of crude oil and water will be separated for a long time. Use a four-bladed stirring rod at 550r / min, 45°C water bath, and mechanically stir for 40 minutes to make the crude oil Re-emulsify, and then carry out the demulsification test.

[0029] Demulsification experiment of the present invention: a certain amount of re-emulsified crude oil (or directly extracted crude oil production fluid), a certain amount of demulsifier through the feed port (demulsifier feed port 11 and crude oil production fluid feed Port 12) into the reaction kettle, turn on the circulation pump 4 to make the liquid in the kettle flow slowly, the liquid material is kept at a certain temperature through the temperature control of the heat exchanger, fill in the process gas to the system pressure of 1MPa and then empty it, repeat the reaction of the replacement injecti...

Embodiment 1

[0036] The ratio of opening diameter D1 of inlet section of Venturi injector used in this example: inner diameter of nozzle D2: inner diameter of air chamber closing D3: length of mixing section L1: length of diffusing section L2 is 38:3:4:350 : 1500, the opening angle of the diffusion section is 10°.

[0037] Preparation of emulsified crude oil: Due to the long time interval from sampling time, the mixed sample of crude oil and water has been placed for a long time to stratify. Use a four-bladed stirring rod at 550r / min, 45°C water bath, and mechanically stir for 40 minutes to re-emulsify the crude oil, and then carry out Demulsification experiment as follows.

[0038] Demulsification experiment of the present invention: add a certain amount of re-emulsified crude oil, a certain amount of demulsifier (SP-169, consumption is 80mg / L) in the reaction kettle through the feed port, open the circulation pump 4 to make the liquid in the kettle Flow slowly, the liquid material is co...

Embodiment 2

[0044] The ratio of the opening diameter D1 of the inlet section of the venturi injector used in this example: the inner diameter of the nozzle D2: the inner diameter of the gas chamber closing D3: the length of the mixing section L1: the length of the diffusion section L2 The ratio is 38:3.5:5:220 : 1150, the opening angle of the diffusion section is 4°.

[0045] Demulsification experiment of the present invention: add the freshly produced crude oil production fluid and a certain amount of demulsifier (AE8051, the dosage is 75mg / L) into the reaction kettle through the feed port, and turn on the circulation pump 4 to make the liquid in the kettle flow slowly , the liquid material is controlled by a heat exchanger to maintain a temperature of 45 ° C, filled with methane gas to a system pressure of 1 MPa, and then vented, and repeated 3 times to replace the air in the jet loop reactor. After the last replacement, keep the pressure of the reaction system to the demulsification pr...

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Abstract

The invention discloses a novel demulsification method for crude oil produced liquid. The method carries out demulsification treatment on the crude oil produced liquid by adopting an injection loop reactor, and introduces process gas into the injection loop reactor in the demulsification process, crude oil produced liquid and a demulsifying agent are injected into a reaction kettle at a high speed through a Venturi injector of the injection loop reactor, process gas is sucked into the Venturi injector to form micro-level bubbles to act on the crude oil produced liquid, the stability of an oil-water interface film is destroyed, and the demulsification process is accelerated. The injection loop reactor is used for demulsifying the crude oil produced liquid, so that the standing layering time can be obviously shortened, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of crude oil production, and in particular relates to a process method for demulsifying crude oil production fluid by using a new type of reactor equipment—a jet loop reactor. Background technique [0002] At present, in the domestic production process, the method of injecting a large amount of water and surfactant substances (such as oil displacement agent) into the underground oil layer is generally used to enhance the oil recovery rate, resulting in the production of the oil production fluid in an emulsified state, and the water content increases. , The water content of the produced liquid in some oilfields even exceeds 90%. [0003] In addition, natural emulsifiers in crude oil (such as colloids, asphaltenes, naphthenic acids, fatty acids, crystalline paraffin, etc.) adsorb on the oil-water interface to form a firm interfacial film that hinders the drainage and coalescence of dispersed water droplets, ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
CPCC10G33/04C10G2300/1037
Inventor 梅华
Owner 江苏诺盟氢能技术有限公司
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