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A kind of demulsification method of crude oil production fluid

A technology for produced fluid and demulsification, which is used in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc., can solve problems such as less improvement in process methods, reduce standing and stratification time, and save production. Cost, the effect of reducing consumption

Active Publication Date: 2022-03-11
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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  • A kind of demulsification method of crude oil production fluid
  • A kind of demulsification method of crude oil production fluid
  • A kind of demulsification method of crude oil production fluid

Examples

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preparation example Construction

[0028] Preparation of emulsified crude oil: When the time interval between crude oil extraction and 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 550 r / min, 45°C water bath, and mechanically stir for 40 min. The crude oil was re-emulsified, and then the demulsification experiment was carried out.

[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) Add to the reaction kettle, turn on the circulation pump 4 to make the liquid in the kettle flow slowly, the liquid material is controlled by the heat exchanger to maintain a certain temperature, fill in the process gas to the system pressure of 1 MPa and then vent, repeat 3 times to replace the injection circuit air in the rea...

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 was placed for a long time and stratification occurred. A four-blade stirring rod was used at 550 r / min in a 45°C water bath for 40 minutes to re-emulsify the crude oil. Then carry out the following demulsification experiment.

[0038] Demulsification experiment of the present invention: add a certain amount of re-emulsified crude oil and a certain amount of demulsifier (SP-169, the dosage is 80 mg / 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 materi...

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 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 pressu...

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Abstract

The invention discloses a demulsification method for crude oil production fluid. The demulsification method uses a jet loop reactor to demulsify the crude oil production fluid, and feeds process gas into the jet loop reactor during the demulsification process. , crude oil production fluid and demulsifier are injected into the reaction kettle through the Venturi injector of the injection circuit reactor at high speed, and the process gas is sucked into the Venturi injector to form tiny bubbles that act on the crude oil production fluid and destroy the stability of the oil-water interface film and speed up the demulsification process. The invention adopts the injection circuit reactor to demulsify the crude oil production fluid, which can obviously reduce the standing stratification time and improve the production efficiency.

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 reactor device—a jet loop reactor. Background technique [0002] At present, in the process of domestic exploitation, 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 recovery 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, the natural emulsifiers in crude oil (such as colloid, asphaltene, naphthenic acid, fatty acid, crystalline paraffin, etc.) are adsorbed on the oil-water interface to form a firm interfacial film that hinders the drainage and coalescence of dispersed water droplets, making th...

Claims

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Application Information

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Patent Type & Authority Patents(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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