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Self-plugging releasing temperature resistant temporary plugging agent used for water-based drilling fluid and preparation method thereof

A technology of water-based drilling fluid and temporary plugging agent, applied in chemical instruments and methods, drilling compositions and other directions, to achieve high temporary plugging rate and oil phase permeability recovery rate, small amount of organic solvent used, and low production cost Effect

Active Publication Date: 2015-06-17
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Temporary plugging agents with strong temperature resistance and self-blocking removal ability have not been reported in China so far

Method used

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  • Self-plugging releasing temperature resistant temporary plugging agent used for water-based drilling fluid and preparation method thereof
  • Self-plugging releasing temperature resistant temporary plugging agent used for water-based drilling fluid and preparation method thereof
  • Self-plugging releasing temperature resistant temporary plugging agent used for water-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of the self-dissolving and temperature-resistant temporary plugging agent for water-based drilling fluids of this embodiment is carried out as follows:

[0046] (1) Place 1000 grams of starch in a kneader, add 100 grams of sodium hydroxide, 200 milliliters of propanol and 100 milliliters of water, and conduct a closed kneading reaction at a temperature of 20°C for 50 minutes;

[0047] (2) Add 150 grams of sodium hydroxide, 350 grams of chloroacetic acid and 200 milliliters of propanol to the kneaded mixture obtained in step (1), raise the temperature to 40°C, and conduct a closed kneading reaction for 100 minutes;

[0048] (3) After cooling the kneaded mass obtained in step (2), add 50 g of sodium carbonate, and conduct a closed kneading reaction at a temperature of 20°C for 40 minutes;

[0049] (4) Add 200 ml of propanol and 120 g of p-toluoyl chloride to the kneaded mixture obtained in step (3), raise the temperature to 30° C., and conduct a closed knead...

Embodiment 2

[0054] The preparation method of the self-dissolving and temperature-resistant temporary plugging agent for water-based drilling fluids of this embodiment is carried out as follows:

[0055] (1) Put 1000 grams of starch in a kneader, add 150 grams of sodium hydroxide, 250 milliliters of ethanol and 50 milliliters of water, and conduct a closed kneading reaction at a temperature of 25°C for 60 minutes;

[0056] (2) Add 170 g of sodium hydroxide, 450 g of chloroacetic acid and 250 ml of ethanol to the kneaded mixture obtained in step (1), raise the temperature to 50° C., and seal the kneading reaction for 180 minutes;

[0057] (3) After cooling the kneaded mass obtained in step (2), add 100 g of sodium carbonate, and conduct a closed kneading reaction at a temperature of 25° C. for 60 minutes;

[0058] (4) Add 350 ml of ethanol and 180 g of benzoyl chloride to the kneaded mixture obtained in step (3), raise the temperature to 40°C, and conduct a closed kneading reaction for 90 minutes;

...

Embodiment 3

[0063] The preparation method of the self-dissolving and temperature-resistant temporary plugging agent for water-based drilling fluids of this embodiment is carried out as follows:

[0064] (1) Put 1000 grams of starch in a kneader, add 150 grams of sodium hydroxide, 300 milliliters of isopropanol and 150 milliliters of water, and conduct a closed kneading reaction at a temperature of 30°C for 80 minutes;

[0065] (2) Add 200 grams of sodium hydroxide, 500 grams of chloroacetic acid and 300 milliliters of isopropanol to the kneaded mixture obtained in step (1), raise the temperature to 60°C, and seal the kneading reaction for 150 minutes;

[0066] (3) After cooling the kneaded mass obtained in step (2), add 150 g of sodium carbonate, and conduct a closed kneading reaction at a temperature of 30°C for 80 minutes;

[0067] (4) Add 400 ml of isopropanol and 250 g of sodium phenylacetate to the kneaded mixture obtained in step (3), raise the temperature to 50° C., and conduct a closed kne...

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Abstract

The invention provides a self-plugging releasing temperature resistant temporary plugging agent used for water-based drilling fluid, the self-plugging releasing temperature resistant temporary plugging agent comprises nano calcium carbonate and a product which is obtained by reacting starch, alkali metal hydroxide, halogenated organic acid, carbonate, a hydrophobic modification agent and alcohol with water. The invention also provides a preparation method of the self-plugging releasing temperature resistant temporary plugging agent used for the water-based drilling fluid, and the self-plugging releasing temperature resistant temporary plugging agent used for the water-based drilling fluid can be obtained by proportionally adding components into a kneading machine for kneading. The self-plugging releasing temperature resistant temporary plugging agent has strong high temperature resistance, and can resist the temperature up to 140 DEG C; and the self-plugging releasing temperature resistant temporary plugging agent has good temporary plugging effect and significant reservoir protection effect, and the water-based drilling fluid added with the temporary plugging agent has high temporary plugging rate and oil phase permeability recovery rate; at the same time, the temporary plugging agent has self-plugging releasing ability. During the late flowback, the self-plugging releasing can be realized by formation of a hydrophobic channel without acid washing for mud cake removal and other processes, and secondary damage to a reservoir can be avoided.

Description

Technical field [0001] The invention relates to the technical field of self-removing plugging and hydrophobic temporary plugging in the process of petroleum drilling, in particular to a self-removing plugging and temperature-resistant temporary plugging agent for water-based drilling fluids suitable for reservoir protection and a preparation method thereof. Background technique [0002] Reservoir protection technology in the drilling process is mainly to prevent the drilling fluid from intruding into the reservoir as much as possible on the one hand; Temporary plugging technology is the main reservoir protection measure used in the drilling process in recent years. This technology is mainly to add enough bridging and filling particles matching the reservoir pores into the drilling fluid to form a temporary plugging ring near the well zone. , It can effectively prevent the solid phase and filtrate in the drilling fluid from invading the reservoir and causing various damages. After...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
CPCC09K8/03C09K2208/10
Inventor 李公让李作会武学芹徐运波蓝强张鹏郑成胜张敬辉李海斌
Owner CHINA PETROCHEMICAL CORP
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