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W/O/W type multi-emulsion water plugging system and preparation method thereof

A technology of emulsion and water system, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult injection, high viscosity of water-in-oil emulsion, weak plugging strength, etc., and achieve simple preparation method , Good oil-water selective plugging ability, cheap and easy-to-obtain raw materials

Active Publication Date: 2021-01-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006]Aiming at the deficiencies of the existing technology, especially the weak plugging strength of the existing oil-in-water emulsion; the high viscosity of the water-in-oil emulsion makes it difficult to inject problem, one of the purposes of the present invention is to provide a W / O / W type multiple emulsion water shutoff system, and the second purpose is to provide a preparation method for a W / O / W multiple emulsion water shutoff system

Method used

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  • W/O/W type multi-emulsion water plugging system and preparation method thereof
  • W/O/W type multi-emulsion water plugging system and preparation method thereof
  • W/O/W type multi-emulsion water plugging system and preparation method thereof

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Embodiment 1

[0035] The preparation method of W / O / W type multiple emulsion water plugging system, the steps are as follows:

[0036] (1) Oil phase preparation: Span60 and nano silicon dioxide are dissolved in ethylene tar to obtain an oil phase; the mass fraction of Span60 in the oil phase is 3%, and the mass fraction of nano silica sol is 0.2%;

[0037] (2) Preparation of W / O type primary phase: put the oil phase and water in step (1) in a volume ratio of 5:5 in a beaker, and stir homogeneously at a speed of 8000r / min for 8min to obtain W / O initial phase;

[0038] (3) Preparation of external water phase: dissolving octadecyl dimethyl ammonium oxide and cationic polymer in water to obtain external water phase; the mass fraction of octadecyl dimethyl ammonium oxide in the external water phase is 0.3% , the cationic polymer mass fraction is 0.1%;

[0039] (4) Mix 10mL of the W / O primary phase with 90mL of the external water phase and homogenize at a speed of 3000r / min for 10min to obtain a...

Embodiment 2

[0042] The preparation method of W / O / W type multiple emulsion water plugging system, the steps are as follows:

[0043] (1) Preparation of oil phase: dissolving Span60 and nano-silica in ethylene tar to obtain an oil phase; the mass fraction of Span60 in the oil phase is 2%, and the mass fraction of nano-silica sol is 0.3%;

[0044] (2) Preparation of W / O type primary phase: put the oil phase and water in step (1) in a volume ratio of 6:4 in a beaker, and stir homogeneously at a speed of 8000r / min for 8min to obtain W / O initial phase;

[0045] (3) Preparation of external water phase: dissolving octadecyl dimethyl ammonium oxide and cationic polymer in water to obtain external water phase; the mass fraction of octadecyl dimethyl ammonium oxide in the external water phase is 0.3% , the cationic polymer mass fraction is 0.1%;

[0046] (4) Mix 10mL of the W / O primary phase with 90mL of the external water phase and homogenize at a speed of 3000r / min for 10min to obtain a W / O / W mu...

Embodiment 3

[0049] The preparation method of W / O / W type multiple emulsion water plugging system, the steps are as follows:

[0050] (1) Oil phase preparation: Span60 and nano silicon dioxide are dissolved in ethylene tar to obtain an oil phase; the mass fraction of Span60 in the oil phase is 5%, and the mass fraction of nano silica sol is 0.2%;

[0051] (2) Preparation of W / O type primary phase: put the oil phase and water in step (1) in a ratio of 4:6 by volume in a beaker, and stir homogeneously at a speed of 8000r / min for 8min to obtain W / O initial phase;

[0052] (3) Preparation of external water phase: dissolving octadecyl dimethyl ammonium oxide and cationic polymer in water to obtain external water phase; the mass fraction of octadecyl dimethyl ammonium oxide in the external water phase is 0.4% , the cationic polymer mass fraction is 0.1%;

[0053] (4) Mix 5mL W / O primary phase with 95mL external water phase and homogenize at 3000r / min for 10min to obtain W / O / W multiple emulsion ...

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Abstract

The invention relates to a W / O / W type multi-emulsion water plugging system which is composed of a W / O type initial phase and an outer water phase, the volume ratio of the W / O type initial phase to theouter water phase is (3-0.5:7-9.5), the W / O type initial phase comprises an oil phase and an inner water phase, and the volume ratio of the oil phase to the inner water phase is (4-2:6-8). The oil phase comprises the following components in percentage by mass: 1%-5% of an oil-soluble surfactant, 0.1%-0.5% of nano silicon dioxide sol and the balance of oil. The W / O / W type multi-emulsion water plugging system is injected into an oil well, the W / O / W type multi-emulsion firstly utilizes the Jacquard effect of multiple interfaces to plug a water layer along with the gradual rising of the temperature in the oil well from top to bottom and the entering of the system into the stratum, and meanwhile, the adsorption of an emulsifying agent and a stabilizing agent of a water phase in the W / O / W typemulti-emulsion on the rock surface is realized; and the W / O / W type multiple emulsion outer phase loses stability, the high-viscosity W / O type emulsion is separated out, and a water layer is further blocked.

Description

technical field [0001] The invention relates to a W / O / W multiple emulsion water shutoff system and a preparation method thereof, belonging to the technical field of oil field chemistry. Background technique [0002] Oil well water production is an important phenomenon in the process of oil production in oil fields. The reasons for oil well water production are generally: (1) injection water and edge water advance; (2) bottom water advance; (3) upper and lower water intrusion; (4) ) interlayer water enters, and interlayer water refers to the interlayer water between oil layers, that is, the water layer between the upper and lower oil layers. There are many harms caused by oil well water, such as: (1) oil well produces sand, which damages the loosely cemented sandstone layer, resulting in sand production, and in severe cases, the oil layer collapses or the oil well stops production; As the amount of water continues to increase, the weight of the wellbore liquid column increas...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588C09K8/60C09K8/82
CPCC09K8/584C09K8/588C09K8/602C09K8/82C09K2208/10
Inventor 蒋平唐登宇李隆杰张磊葛际江张贵才陈文征裴海华梁冲崔明月孙铭勤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)