Emulsifying viscosity-reducing oil-displacing agent, preparation method and thick oil viscosity-reducing oil-displacing fracturing method

A technology for emulsification of viscosity-reducing and viscous oil-displacing agents, which is applied in chemical instruments and methods, earthwork drilling, and fluid production, etc., can solve the problems of limited contact area between emulsified and viscosity-reducing oil-displacing agents and crude oil, and achieve effective implementation of heavy oil. Use, increase the degree of use, and stabilize the effect for a long time

Pending Publication Date: 2020-11-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the characteristics of heavy oil in different reservoirs, it is necessary to screen emulsified viscosity-reducing oil displacement agents in a targeted manner; at the same time, for heavy oil reservoirs with strong heterogeneity and poor connectivity, the contact area between emulsified viscosity-reducing oil-displacing agents and crude oil is limited. There is no relevant research on how to increase the contact area between the emulsified viscosity reducer and the heavy oil, and how to improve the fracturing effect of the emulsified viscosity reducer. Relevant technical research needs to be carried out

Method used

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  • Emulsifying viscosity-reducing oil-displacing agent, preparation method and thick oil viscosity-reducing oil-displacing fracturing method
  • Emulsifying viscosity-reducing oil-displacing agent, preparation method and thick oil viscosity-reducing oil-displacing fracturing method
  • Emulsifying viscosity-reducing oil-displacing agent, preparation method and thick oil viscosity-reducing oil-displacing fracturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The emulsified viscosity-reducing oil displacement agent, the components include 0 to 20% of heavy alkylphenol polyoxyethylene phosphate, 13% to 26% of polyalkylene polyoxyethylene benzene sulfonate, B Sodium Oxylated Alkyl Sulfate 8% to 22%, Octylphenol Ethoxylate 6% to 12%, Fatty Alcohol Dimethyl Betaine 4% to 6%, Fatty Alcohol Ethoxylate 0 to 12%, 18% to 22% of organic solvent, 0.5% of solubilizer and the balance of water.

[0024] The emulsified viscosity-reducing oil displacement agent is obtained by the following method: mix the required amount of organic solvent and water uniformly to obtain an organic solvent mixture, raise the temperature to 45 to 55°C, and then add the required amount of heavy alkanes to the organic solvent mixture Alkylphenol polyoxyethylene phosphate and polyalkylphenol polyoxyethylene benzene sulfonate, fully stirred and dissolved, and the system was clarified, then added the required amount of ethoxylated alkyl sodium sulfate...

Embodiment 2

[0030] Embodiment 2: As the optimization of the foregoing embodiment, the emulsified viscosity-reducing oil displacement agent comprises polyalkylene polyoxyethylene benzene sulfonate 24% to 26%, ethoxylated sodium alkyl sulfate 8% to 12%, fatty alcohol Polyoxyethylene ether 8% to 12%, octylphenol polyoxyethylene ether 8% to 12%, fatty alcohol dimethyl betaine 4% to 6%, organic solvent 18% to 22%, solubilizer 0.5%, the rest The amount is water.

[0031] For heavy oil with a crude oil viscosity of 50mPa·s to 20000mPa·s at 50°C, at low speed shear (can be less than 170s -1 ) conditions, the components described in Example 2 have a strong emulsification and viscosity-reducing ability, and have a strong wetting inversion, oil washing and oil displacement ability, and the emulsion has a long stable time.

Embodiment 3

[0032] Embodiment 3: As the optimization of the foregoing embodiment, the emulsified viscosity-reducing oil displacement agent comprises 15% to 20% of heavy alkylphenol polyoxyethylene phosphate, 13% to 15% of polyalkylene polyoxyethylene benzene sulfonate, B Oxylated alkyl sodium sulfate 18% to 22%, octylphenol polyoxyethylene ether 6% to 10%, fatty alcohol dimethyl betaine 4% to 6%, organic solvent 18% to 20%, solubilizer 0.5% %, the balance is water.

[0033] For heavy oil with a crude oil viscosity of 20,001mPa·s to 50,000mPa·s at 50°C, at low speed shear (can be lower than 170s -1 ) conditions, the components described in Example 3 have a strong emulsification and viscosity-reducing ability, and have a strong wetting inversion, oil washing and oil displacement ability, and the emulsion has a long stable time.

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Abstract

The invention relates to the technical field of oil-displacing agents and preparation and use methods thereof, in particular to an emulsifying viscosity-reducing oil-displacing agent, a preparation method thereof and a thick oil viscosity-reducing oil-displacing fracturing method. The emulsifying viscosity-reducing oil-displacing agent comprises the following components: heavy alkylphenol polyoxyethylene phosphate, polyalkyl polyoxyethylene benzene sulfonate, ethoxylated sodium alkyl sulfate, octyl phenol polyoxyethylene ether, fatty alcohol dimethyl betaine, fatty alcohol polyoxyethylene ether and the like. The emulsifying viscosity-reducing oil-displacing agent has the characteristics of low shear external force (static) emulsifying capacity, long emulsion stabilization time, high viscosity reduction rate and the like; meanwhile, when the emulsifying viscosity-reducing oil-displacing agent is applied to volume fracturing or temporary plugging diversion fracturing, the development anduse degree of thickened oil can be greatly improved, and effective use of the thickened oil is achieved.

Description

technical field [0001] The invention relates to the technical field of oil displacement agent and its preparation and use method, and relates to an emulsified viscosity-reducing oil displacement agent and a preparation method thereof, and a heavy oil viscosity-reducing oil displacement fracturing method. Background technique [0002] With the exploration and development of oilfields, the recovery degree of conventional thin oil reservoirs is relatively high, and various oilfields gradually shift their targets to unconventional reservoirs such as heavy oil and shale oil. The overall reserves of heavy oil are large, but due to the high viscosity of crude oil and unmatched process technology, etc., the economic development of heavy oil has been restricted. In heavy oil reservoirs, crude oil has high viscosity and high oil-water mobility ratio, and waterflooding in waterflooding development has serious water flooding fingering phenomenon, and the affected area is small. At the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/68E21B43/26E21B43/22
CPCC09K8/584C09K8/68C09K8/685E21B43/26E21B43/16
Inventor 郑波李同桂李一朋张含沈彬彬马永红王勇吴明江邓有根岳翰林刘斌李雨龙夏旭华
Owner BC P INC CHINA NAT PETROLEUM CORP
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