Amide compound, clay stabilizer as well as preparation method and application of clay stabilizer

A technology of amide compound and clay stabilizer, which is applied in the fields of its preparation, clay stabilizer and amide compound, can solve the problems of adverse effects on drilling fluid performance, limit the scope of application, increase the cost of drilling fluid, etc., and achieve the purpose of inhibiting clay hydration and dispersion, The effect of stable product quality and low production cost

Active Publication Date: 2018-06-01
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practical applications, although the above-mentioned inorganic salts and organic salts have strong inhibitory properties, they need to be added in a large amount to work, which will easily have a negative impact on the performance of the drilling fluid and will also increase the drilling fluid. cost, which limits its scope of application

Method used

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  • Amide compound, clay stabilizer as well as preparation method and application of clay stabilizer
  • Amide compound, clay stabilizer as well as preparation method and application of clay stabilizer
  • Amide compound, clay stabilizer as well as preparation method and application of clay stabilizer

Examples

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preparation example Construction

[0041] The invention provides a kind of preparation method of clay stabilizer, comprises the following steps:

[0042] The citric acid is reacted with polyethylene polyamine to obtain an amide compound; the polyethylene polyamine is selected from diethylene triamine, triethylene tetramine, tetraethylene pentamine, pentaethylene hexamine or hexaethylene heptamine; the Amide compounds have the structure of formula I:

[0043]

[0044] Wherein, n is selected from an integer between 1 and 5;

[0045] The material including the amide compound is discharged to obtain a clay stabilizer.

[0046] The invention synthesizes the clay stabilizer with amide groups and other groups through the amidation reaction, which has a good effect of inhibiting clay hydration and dispersion, and does not affect the performance of drilling fluid at the same time, which is beneficial to application.

[0047] In the present invention, citric acid and polyethylene polyamine are added into a reaction ...

Embodiment 1

[0061] Add citric acid and tetraethylenepentamine into the reaction flask with agitator and condensation according to the ratio of substances of 1:2.50, raise the temperature to 150°C, add 0.5% phenylboronic acid accounting for the mass of the reaction raw materials, and proceed at 170°C After amidation reaction for 2 hours, after the reaction time is up, cool down to 60°C, adjust the pH value to 6.5 with hydrochloric acid with a mass fraction of 18%, cool down to room temperature, and discharge the clay stabilizer for drilling fluid, which is a brown viscous liquid .

[0062] Inhibition rate evaluation method:

[0063] Take 350mL of distilled water, add 0.5% sodium carbonate, dissolve and add 10% calcium bentonite (calcium bentonite for drilling fluid produced by Weifang Huawei Bentonite Group Co., Ltd.), stir at high speed for 20 minutes, and roll at 120°C for 12 hours to obtain a blank Slurry: Take it out after cooling down, stir at high speed for 5 minutes, measure the vi...

Embodiment 2

[0068] Add citric acid and tetraethylenepentamine to the reaction bottle with agitator and condensation according to the ratio of substances of 1:3.05, raise the temperature to 150°C, add phenylboronic acid accounting for 2% of the mass of the reaction raw materials, and react at 150°C After 10 hours, after the reaction time is up, cool down to 60°C, adjust the pH value to 8.0 with 18% hydrochloric acid, cool down to room temperature, and discharge to obtain the clay stabilizer for drilling fluid, which is a brown viscous liquid.

[0069] The inhibition rate was evaluated according to the method in Example 1, and the results showed that the relative inhibition rate of the product was 91.8%.

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Abstract

The invention provides an amide compound, a clay stabilizer as well as a preparation method and an application of the clay stabilizer. The clay stabilizer is prepared from materials comprising the amide compound shown as formula I in the description, wherein the amide compound contains various groups including acylamino, hydroxy, amino groups and the like simultaneously. The clay stabilizer can better inhibit hydration dispersion of clay and can effectively control clay dispersion without affecting properties of drilling fluids. The product can be used as anti-collapse agents and inhibitors inthe drilling fluids together with inorganic cationic anti-collapse agents containing K<+>, NH4<+> and the like, effectively realizes the functions of inhibiting hydration dispersion of the clay, flocculating drilling cuttings and controlling formation mud making, can also serve as the clay stabilizer for fracturing, acidification and oil production-water injection, and the application is facilitated. Besides, the product is low in production cost, high in production efficiency and stable in quality.

Description

technical field [0001] The invention relates to the technical field of oilfield chemicals for petroleum drilling, in particular to an amide compound, a clay stabilizer, a preparation method and application thereof. Background technique [0002] With the development of petroleum engineering technology, there are more and more drilling operations such as deep wells, extended-reach wells and horizontal wells, and the formations encountered are becoming more and more complex. Large changes in eye trajectory and other characteristics lead to serious collapse, expansion and shrinkage of mud shale formations, and severe slurry production, which puts forward higher requirements for the suppression ability of water-based drilling fluids. High-efficiency clay stabilizers are the key to ensuring wellbore stability and drilling fluid inhibition, among which inorganic salts and organic salts are currently the most widely used drilling fluid inhibitors or clay stabilizers. [0003] The i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C235/10C07C231/02C09K8/035C09K8/22
CPCC07C231/02C07C235/10C09K8/035C09K8/22C09K2208/12
Inventor 王中华
Owner 中石化石油工程技术服务有限公司
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