Anti-sloughing modified starch for drilling fluid and preparation method thereof

A technology of drilling fluid and starch, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unobvious anti-slump performance, achieve good effect of reducing water loss and inhibition, simple product process, and high yield Effect

Active Publication Date: 2020-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art that the modified starch synthesized by the above-mentioned cationization method has a single agent use temperature of 100-120°C, and the anti-slump performance is not obvious, etc., the present invention proposes an anti-slump modified starch for drilling fluid, Specifically, it relates to a kind of anti-collapse modified starch for drilling fluid and its preparation method

Method used

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  • Anti-sloughing modified starch for drilling fluid and preparation method thereof
  • Anti-sloughing modified starch for drilling fluid and preparation method thereof
  • Anti-sloughing modified starch for drilling fluid and preparation method thereof

Examples

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Effect test

Embodiment 1

[0069] (1) 100g of cornstarch is dissolved in pure ethanol, and it is configured into a cornstarch suspension with a weight concentration of 20%, and then 45g of quaternary ammonium salt cationic agent 2,3-epoxypropyltrimethylammonium chloride Dissolve in the cornstarch suspension together with 8g of sodium hydroxide, mix uniformly, obtain the cornstarch slurry;

[0070] (2) 25g concentration is that more than 97% chloroacetic acid is dissolved in ethanol and is configured into the chloroacetic acid solution that weight concentration is 6.5%; 28g sodium hydroxide is dissolved in ethanol and is configured into the catalyst solution that weight concentration is 7%; Get step (1 ) prepared cornstarch slurry was poured into a three-necked bottle, first dropwise added 0.05g of epichlorohydrin, and then added successively all the chloroacetic acid solutions prepared in this step and the catalyst solution prepared in this step of 1 / 4 weight, The temperature was raised to 65° C. in a c...

Embodiment 2

[0073] (1) 90g of cornstarch is dissolved in pure ethanol, and it is configured into a cornstarch suspension with a weight concentration of 18%, and then 35g of quaternary ammonium salt cationic agent 2,3-epoxypropyltrimethylammonium chloride Dissolve in the cornstarch suspension together with 6g of alkaline catalyst sodium hydroxide, and mix uniformly to obtain the cornstarch slurry;

[0074] (2) 20g weight concentration of 97% or more chloroacetic acid is dissolved in ethanol to configure a weight concentration of 5.0% chloroacetic acid solution; 36g basic catalyst sodium hydroxide is dissolved in ethanol to configure a weight concentration of 9% catalyst solution. Take the cornstarch slurry prepared in step (1) and pour it into a three-necked bottle, add 0.06g of epichlorohydrin dropwise in turn, then add all the chloroacetic acid solution prepared in this step and 1 / 8 weight of the prepared in this step The catalyst solution was heated to 50° C. in a constant temperature w...

Embodiment 3

[0077] (1) the cornstarch of 110g is dissolved in pure ethanol, is configured into weight concentration and is 22% cornstarch suspension, then 55g quaternary ammonium salt cationic agent 2,3-epoxypropyltrimethylammonium chloride and 9g alkaline catalyst sodium hydroxide is dissolved in the cornstarch suspension together, mixes evenly, obtains cornstarch slurry;

[0078] (2) 26g weight concentration is that more than 97% chloroacetic acid is dissolved in ethanol and is configured into the chloroacetic acid solution that weight concentration is 6%; 24g sodium hydroxide is dissolved in ethanol and is configured into the catalyst solution that weight concentration is 6%; Get step ( 1) Pour the prepared cornstarch slurry into a three-necked bottle, add 0.07g epichlorohydrin dropwise, and then add all the chloroacetic acid solutions prepared in this step and the catalyst solution prepared in this step of 3 / 8 weight in turn, in The temperature was raised to 50° C. in a constant tempe...

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Abstract

The invention relates to anti-sloughing modified starch for a drilling fluid and a preparation method thereof, and belongs to the field of additives for a drilling fluid in petroleum drilling engineering. The anti-sloughing modified starch is mainly prepared from the following raw materials: starch, low-carbon alcohol, a starch acylating agent, a cross-linking agent, a quaternary ammonium salt cationic agent and a catalyst. According to the invention, the anti-sloughing modified starch, which can resist 150 DEG C and has a remarkable anti-sloughing function, is prepared by modifying original starch by using a method of moderately crosslinking and controlling the proportion of anions and cations. The anti-sloughing modified starch is rich in raw materials, has good water loss reduction andinhibition effects, has no pollution to the environment, and has a stable performance.

Description

technical field [0001] The invention relates to the field of drilling fluid additives in petroleum drilling engineering, and more particularly relates to an anti-slump modified starch for drilling fluid and a preparation method thereof. Background technique [0002] With the advancement of environmental protection concepts and the implementation of the new environmental protection law, higher requirements are placed on drilling fluids. How to minimize environmental pollution, meet the safety, high-quality, fast, and efficient requirements of drilling engineering and protect the environment, and ensure drilling fluid treatment The agent is non-toxic and harmless to the environment, and will benefit future generations. However, in order to solve the problems of collapse, diameter shrinkage and serious slurrying in drilling in deep and complex formations, it is often necessary to add asphalt anti-collapse agents, salt inhibitors, etc., among which some toxic monomers are used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C08B31/00C09K8/035
CPCC08B31/125C08B31/003C09K8/035C09K2208/12
Inventor 杨枝祁尚义王治法杨帆孔勇梅春桂褚奇王立双
Owner CHINA PETROLEUM & CHEM CORP
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