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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, poor selectivity, and reducing oil phase permeability

Active Publication Date: 2021-05-11
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

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Effect test

preparation example Construction

[0036] 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 an anionic polymer with water.

[0037] 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:

[0038] (1) mixing the anionic polymer with water to form an aqueous solution;

[0039] (2) mixing the main emulsifier with the aqueous solution to form an emulsion;

[0040] (3) mixing the oil-soluble resin with the emulsion;

[0041] Wherein, th...

Embodiment 1

[0074] This example is used to illustrate the composition with selective water blocking function provided by the present invention.

[0075]1. Weigh 0.01g of partially hydrolyzed polyacrylamide and add it to 100mL of water, and fully stir (600r / min) at 20°C for 3h to form an aqueous solution;

[0076] 2. Weigh 1g of sodium dodecylbenzene sulfonate and 2.5g of Span 60 respectively and add them to the above aqueous solution in sequence, and after fully stirring (600r / min) at 20°C for 1 hour, a stable emulsion is formed;

[0077] 3. Weigh 0.6g of oil-soluble phenolic resin (particle size: 3-50μm) and add it to the above emulsion. After fully stirring (600r / min) at 20°C for 0.5h, a stable emulsion-suspended water blocking material A1 is formed.

[0078] 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 94.22%, the oil shutoff rate is 12.52%, and the erosion resistance multiple...

Embodiment 2

[0080] This example is used to illustrate the composition with selective water blocking function provided by the present invention.

[0081] 1. Weigh 1g of partially hydrolyzed polyacrylamide and add it to 100mL of water, and fully stir (600r / min) at 20°C for 1h to form an aqueous solution;

[0082] 2. Weigh 5g of sodium dodecylsulfonate and 0.5g of Tween 40, respectively, and add them to the above aqueous solution in sequence, and after fully stirring (600r / min) at 30°C for 3 hours, a stable emulsion is formed;

[0083] 3. Weigh 10.6g of coumarone resin (particle size: 3-50μm) and add it to the above-mentioned emulsion. After fully stirring (600r / min) at 50°C for 2 hours, a stable emulsion-suspended water blocking material A2 is formed.

[0084] 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 99.20%, the oil shutoff rate is 14.56%, and the erosion resistance multiple is...

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Abstract

The invention relates to the field of water blocking materials, and discloses a composition with selective water blocking function, a preparation method thereof, a composition prepared by the method and an application thereof. Specifically, the composition contains an oil-soluble resin, a main emulsifier and an anionic polymer, wherein the oil-soluble resin is selected from rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin, terpene resin and ancient horse One or more of the long resins; the main emulsifier is selected from compounds shown in formula (I) and / or compounds shown in formula (II). The composition with selective water shutoff function provided by the invention has a good effect of water shutoff but not oil shutoff, has temperature resistance, salt resistance and erosion resistance, and can well adapt to high temperature and high salt reservoir conditions. R 1 O‑SO 3 -M 1 (Formula I)R 2 ‑SO 3 -M 2 (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): C09K8/42
CPCC09K8/426
Inventor 赵方园王晓春杨捷
Owner CHINA PETROLEUM & CHEM CORP