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Self-removing plugging and anti-temperature temporary plugging agent for water-based drilling fluid and preparation method thereof

A water-based drilling fluid and temporary plugging agent technology, applied in chemical instruments and methods, drilling compositions, etc., to achieve strong temperature resistance, low production cost, and significant reservoir protection effects

Active Publication Date: 2019-01-01
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-removing plugging and anti-temperature temporary plugging agent for water-based drilling fluid and preparation method thereof
  • Self-removing plugging and anti-temperature temporary plugging agent for water-based drilling fluid and preparation method thereof
  • Self-removing plugging and anti-temperature temporary plugging agent 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-plugging and anti-temperature temporary plugging agent for water-based drilling fluid of this embodiment is carried out according to the following steps:

[0046] (1) Put 1000 grams of starch in a kneader, add 100 grams of sodium hydroxide, 200 milliliters of propanol and 100 milliliters of water, and knead in a closed state 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), heat up to 40° C., and knead in a closed state for 100 minutes;

[0048] (3) After cooling the kneaded mixture obtained in step (2), add 50 grams of sodium carbonate, and knead the reaction in airtight conditions at a temperature of 20° C. for 40 minutes;

[0049] (4) Add 200 milliliters of propanol and 120 grams of p-toluoyl chloride to the kneaded mixture obtained in step (3), raise the temperature to 30° C., and perf...

Embodiment 2

[0054] The preparation method of the self-plugging and anti-temperature temporary plugging agent for water-based drilling fluid of this embodiment is carried out according to the following steps:

[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 knead the mixture at a temperature of 25° C. for 60 minutes;

[0056] (2) Add 170 grams of sodium hydroxide, 450 grams of chloroacetic acid and 250 milliliters of ethanol to the kneaded mixture obtained in step (1), heat up to 50 ° C, and knead in a closed state for 180 minutes;

[0057] (3) After cooling the kneaded mixture obtained in step (2), add 100 grams of sodium carbonate, and knead in a closed state at a temperature of 25° C. for 60 minutes;

[0058] (4) 350 milliliters of ethanol and 180 grams of benzoyl chloride were added to the kneaded mixture obtained in step (3), the temperature was raised to 40° C., and the airtight kneading...

Embodiment 3

[0063] The preparation method of the self-plugging and anti-temperature temporary plugging agent for water-based drilling fluid of this embodiment is carried out according to the following steps:

[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 knead 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 perform airtight kneading for 150 minutes;

[0066] (3) After cooling the kneaded mixture obtained in step (2), add 150 grams of sodium carbonate, and knead in a closed state at a temperature of 30° C. for 80 minutes;

[0067] (4) Add 400 milliliters of isopropanol and 250 grams of sodium phenylacetate to the kneaded mixture obtained in step (3), heat up to 50° C., and knead in a closed state fo...

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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, drainage and temporary plugging in the process of petroleum drilling, in particular to a self-removing plugging and anti-temperature temporary plugging agent for water-based drilling fluid suitable for protecting reservoirs and a preparation method thereof. Background technique [0002] The reservoir protection technology in the drilling process is mainly to prevent the drilling fluid from invading 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 in the drilling fluid to form a temporary plugging ring near the wellbore. , Effectively prevent the solid phase and filtrate in the drilling fluid from invading the reservoir and cause various damages. After the oil well is...

Claims

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Application Information

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Patent Type & Authority Patents(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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