Preparation method of polyamide inhibitor for drilling fluid

A technology of polyamide and drilling fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of limited adsorption capacity, loss of inhibitory effect, etc., and achieve small influence on rheology, good inhibitory effect, and rolling recovery rate improved effect

Inactive Publication Date: 2018-02-16
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the limited adsorption capacity of the conventional inhibitors represented by the above-mentioned patent documents, desorption often occurs at high temperatures, resulting in the loss of inhibition at high temperatures.

Method used

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  • Preparation method of polyamide inhibitor for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dodecyl primary amine is dissolved in isopropanol, then dimethyl maleate is added to the alcohol solution, and mixed evenly.

[0025] Adjust the temperature to 50°C and react for 20 hours to obtain an intermediate product.

[0026] Add monoethanolamine to the intermediate product, add sodium hydroxide as a catalyst, heat up to reflux temperature, and react for 12 hours.

[0027] Isopropanol was distilled off to obtain a yellow viscous liquid as the product.

Embodiment 2

[0029] Decyl primary amine is dissolved in isopropanol, and then diethyl maleate is added to the alcohol solution to make it evenly mixed.

[0030] Adjust the temperature to 70°C and react for 15 hours to obtain an intermediate product.

[0031] Diethanolamine was added to the intermediate product, potassium hydroxide was added as a catalyst, the temperature was raised to reflux temperature, and the reaction was carried out for 12 hours.

[0032] Isopropanol was distilled off to obtain a yellow viscous liquid as the product.

Embodiment 3

[0034] Dissolve octadecyl primary amine in tert-butanol, then add diisobutyl maleate into the alcohol solution, and mix well.

[0035] Adjust the temperature to 60°C and react for 20 hours to obtain an intermediate product.

[0036] Add N-hydroxyethylethylenediamine to the intermediate product, add sodium hydroxide as a catalyst, heat up to reflux temperature, and react for 12 hours.

[0037] The tert-butanol was evaporated to obtain a yellow viscous liquid as the product.

[0038] Embodiment performance evaluation method

[0039] 1. Polyamide inhibitor rolling recovery test

[0040] Get 4 parts of 350mL distilled water, three parts of which add 1% polyamide inhibitor (embodiment 1), 7% commonly used inhibitor potassium chloride and 40% commonly used inhibitor potassium formate, in a low speed stirrer (1000rpm / min) and stirred for 10 min. Pour four parts of liquid into the aging tank, and then add 50g of mud shale cuttings respectively. The rolling recoveries of the four...

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Abstract

The invention discloses a preparation method of a polyamide inhibitor for drilling fluid. The preparation method comprises the following steps: (a) dissolving a substance A in an alcohol solvent, andadding a substance B into the alcohol solution of the substance A, wherein the mass ratio of A to B is (1 to 1.5): 1, the reaction temperature is 45-70 DEG C, and the reaction time is 12-24h, so as toobtain an intermediate product; (b) adding a substance C and a catalyst into the intermediate product, wherein the mass ratio of C to A is (0.5 to 1.2): 1, and the dosage of the catalyst accounts for1% of the substance A; heating to a reflux temperature, and reacting for 4-12h at the reflux temperature; (c) distiling out the solvent alcohol to obtain a product. The polyamide inhibitor prepared by the invention has the characteristics of remarkable high-temperature resisting and inhibiting effect, and little impact on rheological property and the like, and is suitable for different water-based drilling fluid systems. The polyamide inhibitor can prevent the problem of borehole instability caused by hydration dispersion and expansion of clay minerals on water-sensitive formation, and also can effectively stabilize the rheological property of the drilling fluid system so as to avoid failure in performance control.

Description

technical field [0001] The invention relates to the technical field of inhibitors for drilling fluids, in particular to a preparation method of polyamide inhibitors for drilling fluids. Background technique [0002] When water-sensitive formations such as mudstone and shale are drilled with water-based drilling fluids, formation minerals are prone to hydration, expansion and dispersion, resulting in problems such as wellbore instability and difficulty in controlling the rheology of drilling fluids. Therefore, from the perspective of drilling fluid, the inhibition of drilling fluid system becomes the key to drilling water-sensitive formations. Inhibition of the drilling fluid system has become an important factor for safe drilling on site. [0003] At present, the main inhibitors are inorganic potassium salts, organic potassium salts, quaternary ammonium salts, organic amines and amine (ammonium) polymerization. Although these inhibitors have a certain inhibitory effect, th...

Claims

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Application Information

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IPC IPC(8): C09K8/24C08G69/00
Inventor 吴正良陶怀志景岷嘉欧阳伟陈俊斌袁志平王娟
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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