In-situ emulsification and viscosity increase system with controllable viscosity, and application thereof in water-flooding oil reservoir

A water-flooding and viscosity technology, which is applied in the fields of production fluids, drilling compositions, chemical instruments and methods, etc., can solve the problems of aggravating reservoir heterogeneity, difficult emulsion propagation, and high injection pressure, and achieves economical results. Outstanding benefits, good injectability, and the effect of improving seepage resistance

Active Publication Date: 2019-08-27
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the emulsion with too high viscosity to spread in the formation, resulting in too high injection pressure, which seriously affects production
On the other hand, the field practice shows that the low-viscosity water phase emulsion is easily formed in the high-permeability layer and the high-viscosity oil phase emulsion is easily formed in the low-permeability layer, which in turn aggravates the heterogeneity of the reservoir.

Method used

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  • In-situ emulsification and viscosity increase system with controllable viscosity, and application thereof in water-flooding oil reservoir
  • In-situ emulsification and viscosity increase system with controllable viscosity, and application thereof in water-flooding oil reservoir
  • In-situ emulsification and viscosity increase system with controllable viscosity, and application thereof in water-flooding oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 The oil-water interfacial tension of the in-situ emulsification viscosity-increasing system with controllable viscosity

[0037] The degree of salinity is prepared separately to be 0.5×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.01×10 4 mg / L) No. 1#, 3×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.1×10 4 mg / L) No. 2#, 5×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.5×10 4 mg / L) No. 3#, 10×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 1.0×10 4 mg / L) No. 4# and 24×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 1.5×10 4 mg / L) No. 5# mineralized water, stirred for 1 hour. Add 0.2% sodium petroleum sulfonate, 0.2% sodium dodecyl sulfonate, 0.15% ultrafine silicon dioxide, 0.05% partially hydrolyzed polyacrylamide in 1#; add 0.2% in 2# % fatty alcohol ether sodium carboxylate, 0.2% sodium dodecylbenzenesulfonate, 0.15% ultrafine montmorillonite, 0.05% hydroxymethyl cellulose; add 0.4% dodecyl cellulose in 3# in sequence Alkyl hydroxy sulta...

Embodiment 2

[0042] Example 2 Apparent Viscosity of In-Situ Emulsification and Viscosification System with Controllable Viscosity

[0043] The degree of salinity is prepared separately to be 0.5×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.01×10 4 mg / L) No. 1#, 3×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.1×10 4 mg / L) No. 2#, 5×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.5×10 4 mg / L) No. 3#, 10×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 1.0×10 4 mg / L) No. 4# and 24×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 1.5×10 4 mg / L) No. 5# mineralized water, stirred for 1 hour. Add 0.2% sodium fatty alcohol ether carboxylate, 0.2% sodium dodecylsulfonate, 0.15% ultrafine montmorillonite, and 0.05% amylose in 1#; add 0.2% in 2# % fatty alcohol ether sodium sulfonate, 0.2% sodium dodecylbenzene sulfonate, 0.15% ultrafine ferric oxide, 0.05% sodium alginate; add 0.4% alkanolamide in sequence to 3# , 0.15% superfine iron oxide, 0.05% hydroxymethyl cellulose; 0.4% lau...

Embodiment 3

[0047] Example 3 Viscosity of the emulsion formed by the in-situ emulsification viscosity-increasing system and crude oil with controllable viscosity

[0048] The degree of salinity is prepared separately to be 0.5×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.01×10 4 mg / L) No. 1#, 3×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.1×10 4 mg / L) No. 2#, 5×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 0.5×10 4 mg / L) No. 3#, 10×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 1.0×10 4 mg / L) No. 4# and 24×10 4 mg / L (Ca 2+ , Mg 2+ The concentration is 1.5×104 mg / L) No. 5# mineralized water, stirred for 1 hour. Add 0.4% sodium carboxylate petroleum, 0.15% superfine montmorillonite, and 0.05% amylose in 1#; add 0.4% sodium fatty alcohol ether sulfonate, 0.15% super Fine silicon dioxide, 0.05% hydroxymethyl cellulose; Add 0.4% dodecyl hydroxy sultaine, 0.15% superfine iron oxide, and 0.05% sodium alginate in 3#; Add 0.4% alkanolamide, 0.15% superfine titanium dioxide,...

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Abstract

The invention discloses an in-situ emulsification and viscosity increase system with controllable viscosity. The system comprises ingredients by weight, including 0.3%-1.5% of emulsifier, 0.05%-0.5% of superfine colloidal particles, 0.01%-0.1% of suspending agent and the balance being mineralized water, wherein the emulsifier is one of or a combination of mahogany petroleum sulfonate, petroleum carboxylate, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, alkyl polyglycoside, aliphatic alcohol ether carboxylate, aliphatic alcohol ether sulfonate, hydroxyl sulphobetaine and alkanolamide; the superfine colloidal particles are made of one of superfine silicon dioxide, superfine montmorillonoid, superfine ferric oxide, superfine ferroferric oxide, superfine aluminum oxide and superfine titanium dioxide; and the suspending agent is one of partially hydrolyzed polyacrylamide, amylose, carboxymethyl chitosan, hydroxymethyl cellulose, xanthan gum and align. The in-situ emulsificationand viscosity increase system is applicable to a water-flooding oil reservoir with the viscosity of lower than 50 mPa.s, is not influenced by temperatures and a degree of mineralization of the oil reservoir, has a very broad coverage scope and outstanding economic benefits and can effectively promote efficient development of water-flooding oil reservoirs.

Description

technical field [0001] The invention relates to an in-situ emulsification viscosity-increasing system with controllable viscosity and its application in water flooding reservoirs, belonging to the technical fields of oilfield chemistry and oilfield exploitation. Background technique [0002] Reservoirs developed by waterflooding are affected by heterogeneity. The high-permeability area has high water-flooding sweep and low remaining oil saturation, while the low-permeability area has low water-flooding sweep and high remaining oil saturation (Liu R, Du D ,Pu W,et al.Enhanced oil recovery potential of alkyl alcohol polyoxyethylene ethersulfonate surfants in high-temperature and high-salinity reservoirs[J].Energy&Fuels,2018,32:12128-12140). The type of emulsion in water flooding reservoirs is closely related to the water cut. The oil external phase emulsion is easy to form under the condition of low water cut; the water external phase emulsion is easy to form under the conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/20
CPCE21B43/16E21B43/20C09K8/584C09K8/588C09K2208/10
Inventor 刘锐蒲万芬杜代军孙琳庞诗师赵平起蔡明俊张家良
Owner SOUTHWEST PETROLEUM UNIV
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