High-temperature-resistant organosilicon-amine inhibitor for water-based drilling fluid and preparation method of organosilicon-amine inhibitor

A water-based drilling fluid, high-temperature resistance technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient temperature resistance, adsorption damage, intensified thermal motion, etc., to achieve ideal temperature resistance, guarantee Robust, mild conditions

Inactive Publication Date: 2016-06-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temperature resistance of the inhibitor is insufficient, its molecular structure is easily damaged by high temperature, and when subjected to high temperature, the thermal movement of the inhibitor molecule is intensified, and the adsorption between it and the clay particles is destroyed.
Under the joint influence of high temperature desorption and degradation, the inhibitory performance of the inhibitor is greatly reduced, or even completely lost

Method used

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  • High-temperature-resistant organosilicon-amine inhibitor for water-based drilling fluid and preparation method of organosilicon-amine inhibitor
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  • High-temperature-resistant organosilicon-amine inhibitor for water-based drilling fluid and preparation method of organosilicon-amine inhibitor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of Inhibitor PKDAS

[0028] Accurately weigh 100.0g of N,N-dimethylformamide, pour it into a three-necked flask with a capacity of 500ml, turn on the magnetic stirring, and weigh 15.5g of N,N-dimethylpropionamide, 5.3g of Dimethyl diallyl ammonium chloride and 4.2g of γ-(methacryloyloxy)propyltrimethoxysilane are poured into a three-necked flask filled with DMF, and after it is fully mixed, nitrogen gas is exhausted. Oxygen, be warming up to reaction temperature, and after logical nitrogen 30 minutes, add the initiator azobisisobutyronitrile of 0.1g, obtain powdery white gel-like product after 8 hours reaction under logical nitrogen condition, it is taken out and Soak in excess benzene, let it stand for 24 hours, filter and separate it with a Soxhlet extractor, soak the insoluble components in excess absolute ethanol for 12 hours, then carry out vacuum filtration, collect the insoluble components on the filter paper and then vacuum them Dried and pulverized...

Embodiment 2

[0031] Structural characterization of the inhibitor PKDAS

[0032] see figure 1 , figure 1 It is the infrared absorption spectrogram of inhibitor PKDAS, and its characteristic absorption peak analysis of the spectrum is as follows:

[0033] 3452cm -1 The place is the C=O bond stretching vibration absorption peak in the KH-570 ester group; 2929cm -1 In the main chain of the copolymer molecule -CH 2 - stretching vibration peak; 2124cm -1 The place is -N-CH in the structural unit of DMAA and DMDAAC 3 The absorption peak; 1722cm -1 The place is the C=O bending vibration absorption peak of DMAA primary amide group; 1635cm -1 It is the C=O bond stretching vibration absorption peak in the DMAA tertiary amide group; 1494cm -1 The peak is the C-N bond stretching vibration peak in DMAA; 1407cm -1 The -CH of the siloxane group in KH-570 3 The absorption peak; 1349cm -1 N-CH in DMAA 3 The characteristic absorption peak; 1257cm -1 The place is the C=O bond stretching vibration...

Embodiment 3

[0036] Thermogravimetry-differential calorimetry (TG-DSC) analysis of inhibitor PKDAS

[0037] see figure 2 , figure 2 is the thermogravimetric-differential thermal analysis diagram of the inhibitor PKDAS, obtained by figure 2 It can be seen that the thermal degradation process of PKDAS can be divided into four stages according to its temperature range:

[0038] (1) Temperature range: 25.00℃~182.31℃

[0039]The TG curve in this temperature range gradually decreases, indicating that the mass of the sample decreases due to heating, and its weight loss percentage is 11.27%, while the DSC curve first rises and then declines, forming a gentle endotherm after forming a steep exothermic peak peak. This is because the siloxane groups in the molecular structure of the sample are hydrolyzed to form silanol groups due to water absorption and moisture, and the latter undergo condensation reactions with each other and a large amount of heat is released, resulting in an exothermic pe...

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PUM

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Abstract

The invention provides a high-temperature-resistant organosilicon-amine inhibitor for a water-based drilling fluid and a preparation method of the organosilicon-amine inhibitor. N,N-dimethylacrylamide, diallyldimethylammonium chloride and gamma-methacryloxypropyltrimethoxysilane in a certain ratio are taken as reaction monomers and subjected to free radical copolymerization, and the inhibitor is prepared; the preparation method is simple, and the yield is high. Indoor evaluation experiments prove that the prepared organosilicon-amine inhibitor not only can effectively inhibit hydration and mud making of bentonite and drilling cuttings at the room temperature of 25 DEG C, but also can still maintain higher inhibition performance after ageing at 220 DEG C for 16 h, and the inhibitor is suitable for drilling operation of an active shale formation.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas, in particular to a high-temperature resistant organic silicon-amine inhibitor for water-based drilling fluid and a preparation method thereof. Background technique [0002] Formation instability caused by mud-making action of clay minerals has become a common event in drilling engineering. Drilling fluid inhibitors are one of the key treatment agents for water-based drilling fluid systems. They can inhibit the hydration of formation minerals and cuttings, maintain wellbore stability and regular wellbore diameter, and prevent bit balling. [0003] As the exploration and development of oil and gas resources in deep formations continue to increase, the temperature of the lower well section continues to rise, and the inhibitors are facing severe challenges from high temperature effects. At present, the amine inhibitors used in the domestic field generally have the ability to resist ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F226/02C08F230/08C09K8/035
CPCC08F220/54C09K8/035C08F226/02C08F230/08
Inventor 罗霄蒲晓林都伟超黄桃
Owner SOUTHWEST PETROLEUM UNIV
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