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Preparation method of polyamide inhibitor for drilling liquid

A polyamide and inhibitor technology, applied in the field of preparation of polyamide inhibitors, can solve the problems of limited adsorption capacity, loss of inhibitory effect, etc., and achieve the effects of small influence, good inhibitory effect and low cost

Inactive Publication Date: 2018-02-23
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 liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add nitrilotriacetic acid and a certain amount of N-methylpyrrolidone into a device with stirring, reflux condenser, thermometer and a device with a nitrogen pipe, and stir at room temperature until the monomer is completely dissolved;

[0025] Start to heat up, and after reaching 80°C, add N,N'-hydroxydiimidazole (ratio of the amount of substance to nitrilotriacetic acid is 3:1), react for 4 hours, bubble nitrogen for several minutes, and then add 4,4 '-diaminodiphenyl ether (the ratio of the amount of substance to nitrilotriacetic acid is 1:1);

[0026] After the system reacted at this temperature for several hours, benzyl alcohol was added, and the reaction was continued for 4 hours to terminate the reaction.

Embodiment 2

[0028] Add nitrilotriacetic acid and a certain amount of N-methylpyrrolidone into the reaction kettle with stirring, reflux condenser device, thermometer and nitrogen pipe, and stir at room temperature until the monomer is completely dissolved;

[0029] Start to heat up, after reaching 80°C, add N,N'-hydroxydiimidazole (ratio of substance to nitrilotriacetic acid is 3:1), react for 3 hours, blow nitrogen for several minutes, and then add ethylenediamine (The ratio of the amount of substance to nitrilotriacetic acid is 1:1);

[0030] After the system reacted at this temperature for several hours, benzyl alcohol was added, and the reaction was continued for 3 hours to terminate the reaction.

Embodiment 3

[0032] Add trimesic acid and a certain amount of N-methylpyrrolidone into the reactor body with stirring, reflux condenser device, thermometer and nitrogen pipe, and stir at normal temperature until the monomer is completely dissolved;

[0033] Start to heat up, and after reaching 80°C, add N,N'-hydroxydiimidazole (the ratio of the amount of trimesic acid to the substance is 3:1), react for 5 hours, and bubble nitrogen for several minutes to remove oxygen in the device , and then add 4,4'-diaminodiphenyl ether (the ratio of the amount of trimellitic acid to the substance is 1:1);

[0034] After the system reacted at this temperature for several hours, benzyl alcohol was added, and the reaction was continued for 5 hours to terminate the reaction.

[0035] Embodiment performance evaluation method

[0036] 1. Polyamide inhibitor rolling recovery test

[0037] Get 4 parts of 350mL distilled water, three parts of which add 1% polyamide inhibitor (embodiment 3), 7% commonly used i...

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Abstract

The invention discloses a preparation method of a polyamide inhibitor for a drilling liquid. The preparation method comprises the following steps of a, adding a monomer A and a solvent into a reactionkettle with a stirring and reflux condensing tube device, a thermometer and a nitrogen leading tube, and stirring at normal temperature until the monomer A is completely dissolved; b, heating to 80 DEG C, adding a matter A according to a ratio of the matter A to the monomer A equal to 3:1, reacting for 3 to 5h, leading nitrogen to bubble for 3 to 5min, and adding a monomer B according to a ratioof the monomer B to the monomer A equal to 1:1; reacting for 3 to 5h at the temperature, adding an end-capping reagent, continuing to react for 3 to 5h, and terminating reaction. Compared with the conventional water-based treatment agent, the inhibitor prepared by the preparation method has the advantages that the compounding property is good, the influence to the property of the water-based drilling liquid is little, the inhibiting ability of the water-based drilling liquid can be effectively enhanced, the function of inhibiting hydration dispersing of minerals in a water-sensitive stratum isrealized, the drilling cost is reduced, and the safety and speed in drilling are ensured.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/40C08G69/28C09K8/24C09K8/035
Inventor 刘翔陶怀志王参书袁志平景岷嘉王星媛王兰
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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