High-temperature high-salt oil reservoir in-situ emulsion system and application thereof

A high-temperature, high-salt, emulsifying system technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of low oil displacement efficiency, achieve good anti-aging performance, improve mobility ratio, and meet oil displacement needs Effect

Active Publication Date: 2019-07-16
SOUTHWEST PETROLEUM UNIV +1
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  • Abstract
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Problems solved by technology

Ning Jian et al. (Ning Jian et al. Compatibility of low-cost O/W emulsion with core pore throats and its oil displacement efficiency[J]. Oilfield Chemistry, 2018, 35(2): 142-146) studied the low-cost O/W emulsion Compatibility of W-type emulsion with core pore throat and its oil displacement ef...

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  • High-temperature high-salt oil reservoir in-situ emulsion system and application thereof
  • High-temperature high-salt oil reservoir in-situ emulsion system and application thereof
  • High-temperature high-salt oil reservoir in-situ emulsion system and application thereof

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Embodiment 1

[0025] The following detailed description is exemplary and intended to provide further explanation to the present application. Unless otherwise specified, all technical and scientific terms used herein have the meanings commonly understood by one of ordinary skill in the art to which this application belongs.

[0026] The present invention will be further described below in conjunction with the implementation examples and accompanying drawings, but is not limited to the present invention.

[0027] (1) Preparation of in-situ emulsification system:

[0028] 1) Preparation of high salinity water: prepare simulated formation water with high salinity, its composition is 22×10 4 mg / L NaCl+0.5×10 4 mg / L CaCl 2 .

[0029] 2) Preparation of the in-situ emulsification system for high-temperature and high-salt reservoirs: the in-situ emulsification system prepared by using the high-salinity water prepared in 1), the composition of which is 0.2% alkylphenol polyoxyethylene ether sulfo...

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Abstract

The invention discloses a high-temperature high-salt oil reservoir in-situ emulsion system and an application thereof. The in-situ emulsion system comprises 0.1-0.3% of alkylphenol(alcohol) polyoxyethylene ether sulfonate, 0.05-0.1% of sodium dodecyl sulfate, 0.05-0.1% of nano silicon dioxide and the balance of water. The interfacial tension of the in-situ emulsion system and crude oil can reach 10 <-2>-10<-3> mN/m, and under a shearing condition, the crude oil and water can form an O/W emulsion, and viscosity of the emulsion is greater than viscosity of water, so that the mobility ratio can be effectively improved. When being applied to chemical flooding of a high-temperature high-salt oil reservoir, emulsion droplets can block large pores in a porous medium through a Jamin effect, heterogeneity of a reservoir stratum is improved, and a low-permeability layer is started, so that the recovery rate is greatly improved. Meanwhile, the anti-aging property of the system under a high-temperature high-salt condition is good, and the oil-displacing requirement of high-temperature high-salt oil reservoirs can be met.

Description

technical field [0001] The invention relates to an in-situ emulsification system for high-temperature and high-salt oil reservoirs and its application, and belongs to the technical fields of oilfield chemistry and oilfield exploitation. Background technique [0002] At present, most of the oil reservoirs in my country have entered the stage of high water cut, but the recovery rate is less than 40%. Therefore, there is a broad research space for enhanced oil recovery technology. However, chemical flooding has a high EOR and can meet most reservoir conditions, so it has broad research and application prospects. Chemical flooding mainly includes surfactant flooding, polymer flooding, alkaline water flooding and composite flooding. Affected by temperature, salinity and polymer properties, polymer flooding and polymer-based chemical flooding cannot be used in the development of type III reservoirs, and at the same time, due to scaling and scale damage to reservoirs during alkali...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/60
CPCC09K8/584C09K8/602C09K8/604C09K2208/10
Inventor 蒲万芬杜代军刘锐庞诗师
Owner SOUTHWEST PETROLEUM UNIV
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