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Composition with selective water blocking function and its preparation method and application

A composition and selective technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of restricting oil well water plugging, reducing oil phase permeability, poor selectivity, etc.

Active Publication Date: 2020-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, most of the selective plugging agents currently used in oil well water plugging are water-soluble polymers such as polyacrylamide and its derivatives to generate gel or jelly in the formation to seal formation water, or use oil The base plugging agent gels or solidifies when it meets water to block water channeling. However, due to its poor selectivity, it will greatly reduce the oil phase permeability while blocking water, resulting in low liquid after plugging, which restricts the application of oil well water plugging technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] In the second aspect, the present invention also provides a method for preparing a composition with selective water blocking function, the method comprising: mixing an oil-soluble resin, a main emulsifier and a co-emulsifier with water.

[0035] In the present invention, the material with selective water blocking function can be obtained by mixing the above-mentioned components, but mixing the components in a certain order can further improve its water blocking performance, therefore, in a preferred implementation of the present invention In the mode, the present invention also provides a preparation method of a composition having a selective water blocking function, the preparation method comprising the following steps:

[0036] (1) The main emulsifier is mixed with water to form an aqueous solution;

[0037] (2) mixing the co-emulsifier with the aqueous solution to form an emulsion;

[0038] (3) mixing the oil-soluble resin with the emulsion;

[0039] Wherein, the oil...

Embodiment 1

[0067] This example is used to illustrate the composition with selective water blocking function provided by the present invention.

[0068] 1. Weigh 1g of sodium dodecylbenzene sulfonate and add it to 100mL of water, stir fully (600r / min) at 30°C for 0.5h to form a stable aqueous solution;

[0069] 2. Weigh 2.5g of Span 20 and add it to the above aqueous solution, fully stir (600r / min) at 30°C for 1 hour, and form a stable emulsion after mixing evenly;

[0070] 3. Weigh 0.6g of oil-soluble phenolic resin (particle size: 3-50μm) and add it to the above-mentioned emulsion. After fully stirring (600r / min) at 30°C for 0.5h, a stable emulsion-suspended water blocking material A1 is formed.

[0071] After testing, under the conditions of high temperature (90°C) and high salt (salinity: 50,000mg / L), the water shutoff rate of water shutoff material A1 is 96.42%, the oil shutoff rate is 16.81%, and the erosion resistance multiple is greater than 50PV . This shows that the water bloc...

Embodiment 2

[0073] This example is used to illustrate the composition with selective water blocking function provided by the present invention.

[0074] 1. Weigh 5g of sodium dodecylsulfonate and add it to 100mL of water, and stir fully (600r / min) at 50°C for 2h to form a stable aqueous solution;

[0075] 2. Weigh 0.6g Tween 60 and add it to the above aqueous solution, fully stir (600r / min) at 50°C for 2 hours, and form a stable emulsion after mixing evenly;

[0076] 3. Weigh 10g of petroleum resin (particle size: 3-50μm) and add it to the above emulsion. After fully stirring (600r / min) at 50°C for 2 hours, a stable emulsion-suspended water blocking material A2 is formed.

[0077] After testing, under the conditions of high temperature (90°C) and high salt (salinity: 80,000mg / L), the water shutoff rate of water shutoff material A2 is 99.33%, the oil shutoff rate is 18.24%, and the erosion resistance multiple is greater than 50PV . This shows that the water blocking material prepared in ...

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PUM

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Abstract

The invention relates to the field of water plugging materials, and discloses a composition with a selective water plugging function and a preparation method, as well as the composition prepared according to the method and application thereof. Specifically, the composition comprises oil soluble resin, a main emulsifying agent and a secondary emulsifying agent based on the weight ratio of 1:(0.2-2.5):(0.05-5), wherein the oil soluble resin is selected from one or more of rosin resin, gum dammar, oil-soluble phenolic resin, petroleum resin, terpene resin and coumarone resin; the main emulsifyingagent is selected from a compound shown in a formula (I) and / or a compound shown in a formula (II). The composition with the selective water plugging function is good in water plugging and oil releasing effects, and has temperature resisting and salt resisting performances and scouring resisting function; the composition is greatly applicable to high temperature and high salt selection criteria of reservoirs. R1O-SO3-M1 (formula I); R2-SO3-M2 (formula II).

Description

technical field [0001] The invention relates to the field of water shutoff materials, in particular to a composition with selective water shutoff function and a preparation method thereof, as well as the composition prepared by the method and its application. Background technique [0002] Polymer water shutoff materials are currently widely used water shutoff agents, which are mainly divided into polymer phase permeability regulators and polymer gel water shutoff agents. The main difference between the two is that the interpenetration modifier is mainly a long-chain polymer molecule, relying on the polymer molecular chain to stretch in the water phase and shrink in the oil phase, forming a dragging effect on the water phase and reducing the water phase penetration rate, the system will not cause physical plugging of pore volume, but the water plugging strength is not enough and the erosion resistance is poor. The polymer gel water shutoff agent uses the change of the effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508C09K8/514C09K8/516
CPCC09K8/5086C09K8/514C09K8/516
Inventor 赵方园杨捷王晓春
Owner CHINA PETROLEUM & CHEM CORP