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Preparation method of imidazoline inhibitor for drilling fluid

A technology of imidazoline and inhibitors, which is applied in the field of preparation of imidazoline inhibitors for drilling fluids, can solve the problems of limited adsorption capacity and loss of inhibition, and achieves little impact on rheology, good inhibition, and good temperature resistance 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 imidazoline inhibitor for drilling fluid
  • Preparation method of imidazoline inhibitor for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Feed oleic acid A and hydroxyethylethylenediamine B in a molar ratio of 2:1, and raise the temperature to 220°C at a heating rate of 5~15°C / min under a residual pressure of 11kPa and stirring , At this temperature, keep it for 2h, and then steam the excess amine under the residual pressure of 3kPa to synthesize the intermediate.

[0027] (2) At 60°C, add water to the synthetic intermediate in step (1) in a molar ratio of 1.5:1 to oleic acid A, and react for 5 hours under the action of catalyst sodium hydroxide C (catalyst sodium hydroxide The molar ratio of C to oleic acid A is 1:15), raise the temperature of the product to 120°C, keep this temperature, and steam off excess water.

[0028] (3) Add methyl acrylate D in the amount of oleic acid A and other substances into the hydrolyzate produced in step (2) dropwise at 50°C, and keep the temperature for 5 hours to obtain the intermediate.

[0029] (4) At 50°C, add phosphorus pentoxide E with a molar ratio of 1:2 to ...

Embodiment 2

[0032] (1) Feed lauric acid A and hydroxymethylethylenediamine B in a molar ratio of 1.5:1, and raise the temperature to 235°C at a heating rate of 5~15°C / min under a residual pressure of 10kPa and stirring , At this temperature, keep it for 2h, and then steam the excess amine under the residual pressure of 2kPa to synthesize the intermediate.

[0033] (2) At 60°C, add water to the synthetic intermediate in step (1) in a molar ratio of 1.5:1 to lauric acid A, and react for 5 hours under the action of catalyst sodium hydroxide C (catalyst sodium hydroxide The molar ratio of C to lauric acid A is 1:20), raise the temperature of the product to 140°C, keep this temperature, and steam off excess water.

[0034] (3) Add ethyl acrylate D in the amount of lauric acid A and other substances into the hydrolyzate produced in step (2) dropwise at 50°C, keep the temperature and react for 4 hours to obtain an intermediate.

[0035] (4) At 50°C, add phosphorus pentoxide E with a molar ratio...

Embodiment 3

[0038] (1) Feed linoleic acid A and hydroxyethylethylenediamine B in a molar ratio of 1:1, raise the temperature to below 220°C at a heating rate of 5~15°C / min under a residual pressure of 9kPa and stirring At this temperature, keep it for 1.5h, and then distill off the excess amine under the residual pressure of 2.5kPa to synthesize the intermediate.

[0039] (2) At 60°C, add water to the synthetic intermediate in step (1) in a molar ratio of 1.1:1 to linoleic acid A, and react for 5 hours under the action of catalyst sodium hydroxide C (catalyst hydrogen oxidation The molar ratio of sodium C to linoleic acid A is 1:30), raise the temperature of the product to 140°C, keep this temperature, and distill off excess water.

[0040] (3) Add propyl acrylate D in the amount of linoleic acid A and other substances to the hydrolyzate generated in step (2) dropwise at 50°C, keep the temperature and react for 4 hours to obtain an intermediate.

[0041] (4) At 50°C, add phosphorus pento...

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Abstract

The invention discloses a preparation method of an imidazoline inhibitor for drilling fluid. The preparation method comprises the following steps: (a) adding a substance A and a substance B in a molarratio of (1 to 2):1, and synthesizing an intermediate I; (b) adding water in a molar ratio of (1.1 to 2):1 of water to the substance A into the intermediate I synthesized in the step (a) at 50-100 DEG C; (c) dropwise adding a substance D with equal amount as the substance A into a hydrolysate generated in the step (b) at 50 to 100 DEG C, keeping the temperature and reacting for 1-5h to obtain anintermediate II; (d) adding, in batches, a substance E in a molar ratio of 1:2 of the substance E to the substance A into the intermediate II obtained in the step (c) at 40-100 DEG C to obtain an intermediate III; (e) adding alkali, water and an aqueous solution of the substance A into the intermediate III obtained in the step (d), in a ratio of 2:(40 to 70): 1 to obtain a yellow-brown substance which is the final product. By adopting the method disclosed by the invention, the prepared imidazoline inhibitor has the characteristics of resistance to high temperature, remarkable inhibiting effect, little impact on rheological property and the like, and is suitable for different water-based drilling fluid systems.

Description

technical field [0001] The invention relates to the technical field of inhibitors for drilling fluids, in particular to a preparation method of imidazoline 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, the inhibition of the drilling fluid system becomes the key to drilling water-sensitive formations. At the same time, as the scope and number of shale gas wells currently being drilled continue to expand, the inhibition of the drilling fluid system has become an important factor for safe drilling on site. [0003] Commonly used water-based drilling fluid inhibitors are mainly potassium salts, ammonium salts, and amine (ammonium) polymer inhibitors. Although they have...

Claims

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Application Information

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IPC IPC(8): C07F9/6506C09K8/22
CPCC07F9/6506C09K8/22C09K2208/12
Inventor 陶怀志陈俊斌王娟王睿罗陶涛舒小波曾婷
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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