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Water-soluble temporary plugging agent suitable for secondary fracturing and preparation method thereof

A secondary fracturing, water-soluble technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of rising water content of construction wells and limited influence, and achieve enhanced plugging capacity, mild reaction conditions, The effect of facilitating large-scale industrial production

Active Publication Date: 2019-09-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Turning to refracturing technology overcomes the limitations of conventional refracturing technology. Conventional refracturing technology can only reopen old fractures and restore the conductivity of old fractures, but the impact on the displacement area of ​​injected water Extremely limited, if the expansion of fracturing scale is adopted for oilfields in the medium-high water-cut development period, the water cut of construction wells after fracturing may rise sharply

Method used

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  • Water-soluble temporary plugging agent suitable for secondary fracturing and preparation method thereof
  • Water-soluble temporary plugging agent suitable for secondary fracturing and preparation method thereof
  • Water-soluble temporary plugging agent suitable for secondary fracturing and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] A preparation method of a water-soluble temporary plugging agent suitable for secondary fracturing, the steps are as follows:

[0021] S1. The raw material components were weighed according to the following mass percentages: 55% polylactic acid, 20% carboxymethyl guar gum, 15% butyl rubber powder, 7% bentonite, and 3% perfluorocetyl ammonium chloride.

[0022] S2. Add polylactic acid into a vacuum kettle, heat to 90°C, and keep the temperature constant. After the polylactic acid is softened, add carboxymethyl guar gum, and stir to mix evenly.

[0023] S3. Add fluorocarbon surfactant to the mixed material in step S1, and mix evenly; then add butyl rubber powder and bentonite, and stir for 2 hours.

[0024] S4. After the reaction is completed, cool and solidify, and pulverize to obtain a water-soluble temporary plugging agent.

Embodiment 2

[0026] A preparation method of a water-soluble temporary plugging agent suitable for secondary fracturing, the steps are as follows:

[0027] S1. The raw material components were weighed according to the following mass percentages: 65% polylactic acid, 21% carboxymethyl guar gum, 10% high-styrene styrene-butadiene rubber powder, 3% bentonite, and 1 perfluorohexadecyl ammonium chloride. %.

[0028] S2. Add polylactic acid into a vacuum kettle, heat to 95° C., and keep the temperature constant. After the polylactic acid is softened, add carboxymethyl guar gum, and stir to mix evenly.

[0029] S3. Add fluorocarbon surfactant to the mixed material in step S1, and mix evenly; then add high-styrene styrene-butadiene rubber powder and bentonite, and stir for 2 hours.

[0030] S4. After the reaction is completed, cool and solidify, and pulverize to obtain a water-soluble temporary plugging agent.

Embodiment 3

[0032] A preparation method of a water-soluble temporary plugging agent suitable for secondary fracturing, the steps are as follows:

[0033] S1. The raw material components are weighed according to the following mass percentages: 60% polylactic acid, 25% carboxymethyl guar gum, 11% mixture of butyl rubber powder and high styrene butadiene rubber powder by mass ratio, 3% bentonite, Perfluorocetyl ammonium chloride 1%.

[0034] S2. Add polylactic acid into a vacuum kettle, heat to 95° C., and keep the temperature constant. After the polylactic acid is softened, add carboxymethyl guar gum, and stir to mix evenly.

[0035] S3. Add a fluorocarbon surfactant to the mixed material in step S1, and mix evenly; then add a mixture of butyl rubber powder and high-styrene-styrene-butadiene rubber powder in an equal mass ratio, and bentonite, and stir for 2 hours.

[0036] S4. After the reaction is completed, cool and solidify, and pulverize to obtain a water-soluble temporary plugging ag...

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Abstract

The invention discloses a water-soluble temporary plugging agent suitable for secondary fracturing. The agent is prepared from the following raw material components in percentage by mass: 55-65% of polylactic acid, 20-25% of carboxymethyl guar gum, 10-15% of rubber powder, 3-8% of bentonite, and 0.5-3% of a fluorocarbon surfactant. The rubber powder is butyl rubber powder or high styrene styrene butadiene rubber powder. The preparation method of the water-soluble temporary plugging agent comprises the following steps: adding the polylactic acid into a decompression kettle, heating to 85-95 DEG C, preserving constant temperature, adding the carboxymethyl guar gum after the polylactic acid softens, and stirring and mixing evenly; adding the fluorocarbon surfactant into a mixed material, and mixing evenly; then adding the rubber powder and the bentonite, and stirring for reacting for 2 hours; cooling and solidifying after the reaction is completed, and smashing to obtain the water-soluble temporary plugging agent. Compared with a conventional temporary plugging agent of the same type, the water-soluble temporary plugging agent disclosed by the invention is higher in plugging strength, adhesion performance and suspension stability than the conventional temporary plugging agent, and the requirements of site construction can be met.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a water-soluble temporary plugging agent suitable for secondary fracturing and a preparation method thereof. Background technique [0002] Since the 1990s, with the application of turning to refracturing technology in major oilfields, the research on temporary plugging agents for fracturing has also become a hot spot of attention. Turning to refracturing technology overcomes the limitations of conventional refracturing technology. Conventional refracturing technology can only reopen old fractures and restore the conductivity of old fractures, but the impact on the displacement area of ​​injected water Extremely limited, if the expansion of fracturing scale is adopted for oilfields in the medium-high water-cut development period, the water cut of construction wells after fracturing may rise sharply. Temporary plugging and refracturing technology is to add te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/514C09K8/68C09K8/88C09K8/90
CPCC09K8/512C09K8/514C09K8/68C09K8/685C09K8/887C09K8/905
Inventor 王世彬胡鹏石磊赵峰刘嘉文高杨刘城成郭建春
Owner SOUTHWEST PETROLEUM UNIV
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