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Preparation method of imidazoline inhibitor applicable to drilling fluid

An imidazoline and inhibitor technology, applied in the field of preparation of imidazoline inhibitors, can solve the problems of loss of inhibitory effect and limited adsorption capacity, and achieve the effects of small influence on rheology, stable filtration performance and good compatibility.

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 applicable to drilling fluid
  • Preparation method of imidazoline inhibitor applicable to drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add lauric acid A and diethylenetriamine B (molar ratio: 2: 1.2) into the reaction kettle, and keep stirring to make them fully mixed.

[0023] The reaction mass was cooled to below 100°C.

[0024] Then reduce the pressure to 0.5kPa, raise the temperature to 240°C, keep the temperature, and react for about 4 hours.

[0025] Stop heating, let the intermediate product cool naturally to 120°C, pour it into the crystallization kettle while it is hot, and cool and condense into a brown-yellow substance, which is the product.

Embodiment 2

[0027] Add caprylic acid A and triethylenetetramine B (molar ratio: 2: 1.05) into the reaction kettle, and keep stirring to make them fully mixed.

[0028] The reaction mass was cooled to below 100°C.

[0029] Then reduce the pressure to 0.7kPa, raise the temperature to 240°C, keep the temperature, and react for about 6h.

[0030] Stop heating, let the intermediate product cool naturally to 110°C, pour it into the crystallization kettle while it is hot, and cool and condense into a brown-yellow substance, which is the product.

Embodiment 3

[0032] Add oleic acid A and diethylenetriamine B (molar ratio: 2: 1.5) into the reaction kettle, and keep stirring to make them fully mixed.

[0033] The reaction mass was cooled to below 100°C.

[0034] Then reduce the pressure to 0.6kPa, raise the temperature to 240°C, keep the temperature, and react for about 8 hours.

[0035] Stop heating, let the intermediate product cool naturally to 120°C, pour it into the crystallization kettle while it is hot, and cool and condense into a brown-yellow substance, which is the product.

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Abstract

The invention discloses a preparation method of an imidazoline inhibitor applicable to drilling fluid. The preparation method comprises the following steps: a. adding a material A and a material B into a reaction kettle according to a molar ratio of 2 : (1 to 2), and continuously stirring for fully mixing; b. cooling reactants to 100 DEG C or below; c. then, reducing the pressure to 0.5-0.7kPa, heating up to 240 DEG C, maintaining the temperature, and reacting for 2-8h; d. stopping heating, cooling to 120 DEG C, pouring the cooled product into a crystallization kettle, and cooling and condensing into a brown yellow material which is the product. The inhibitor prepared by the method provided by the invention is good in compatibility with a conventional water-based treatment agent, has little impact on the properties of water-based drilling fluid, and can effectively strengthen the inhibition ability of the water-based drilling fluid, thus achieving the effect of inhibiting the hydrationdispersion of water sensitive formation minerals; therefore, the well drilling cost is lowered, and the well drilling safety and speed are guaranteed.

Description

technical field [0001] The invention relates to the technical field of inhibitors for drilling fluids, in particular to a method for preparing imidazoline inhibitors suitable 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 t...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/22C07D233/24
CPCC09K8/035C07D233/24C09K8/22C09K2208/12
Inventor 刘滨陶怀志贺海袁志平黎凌明显森王先兵
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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