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Cationic polyamine polymer, and preparation method and application thereof

A cationic polyamine and cationic technology, applied in the field of cationic polyamine polymers and their preparation, can solve the problems of difficult regulation of system rheology, unfavorable environmental protection, unfavorable environmental protection, etc. Water-soluble, environmentally friendly effect

Inactive Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used shale inhibitors for drilling fluids mainly include asphalt, polymers, and inorganic salts. These shale inhibitors have their own shortcomings: for example, asphalt is not conducive to environmental protection; silicate will make the system rheological Difficult to control; glycosides and polyethylene glycols cannot solve the drilling problem of active shale, and usually need to use oil-based drilling fluids that are not conducive to environmental protection
[0005] US5908814 discloses a cationic polyquaternary amine shale inhibitor and its preparation method, but it also has the disadvantage of limited shale inhibitory effect

Method used

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  • Cationic polyamine polymer, and preparation method and application thereof
  • Cationic polyamine polymer, and preparation method and application thereof
  • Cationic polyamine polymer, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] In a 1000 mL four-necked round bottom flask, 60 g of ethylenediamine was added. The temperature was raised to 70°C under stirring. Gradually add 116 g of propylene oxide dropwise, control the reaction temperature to 60-100°C, and react for 1 h to obtain compound (II). Continue to heat up to 95°C, add 185g epichlorohydrin dropwise, and control the reaction temperature at 90-150°C. When the reaction system is thickened, add hydrochloric acid after maintaining for at least half an hour, the molar ratio of hydrochloric acid to ethylenediamine is 2:1, and react for 4 hours to obtain a yellow polyamine solution sample.

Embodiment 2

[0022] In a 1000 mL four-necked round bottom flask, 74 g of 1,3-propanediamine was added. The temperature was raised to 70°C under stirring. Gradually add 116 g of propylene oxide dropwise, control the reaction temperature to 60-100°C, and react for 2 hours to obtain compound (II). Continue to heat up to 95°C, add 185g epichlorohydrin dropwise, and control the reaction temperature within the range of 90-150°C. When thickening of the reaction system occurs, add hydrochloric acid after maintaining for at least half an hour. The molar ratio of hydrochloric acid to compound (II) is 1:2, and react for 3 hours to obtain a yellow polyamine solution.

Embodiment 3

[0024] In a 1000 mL four-necked round bottom flask, 88 g of 1,4-butanediamine was added. The temperature was raised to 70°C under stirring. Gradually add 116 g of propylene oxide dropwise, control the reaction temperature to 60-100°C, and react for 3 hours to obtain compound (II). Continue to heat up to 95°C, add 185g epichlorohydrin dropwise, and control the reaction temperature within the range of 90-150°C. When thickening occurs in the reaction system, add citric acid after maintaining for at least half an hour. The molar ratio of citric acid to compound (II) is 1:2, and react for 2 hours to obtain a yellow polyamine solution.

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Abstract

The invention discloses a cationic polyamine polymer, and a preparation method and application thereof. The cationic polyamine polymer contains double main chains, and can form a grid structure. The preparation method uses terminal diamine, cyclic ether and epoxy chloropropane as raw material, and comprises the following steps: while stirring, dropwisely adding cyclic ether into terminal diamine at 60-100 DEG C to react for 1-4 hours to generate a compound of which the structural formula is (II), wherein the mol ratio of the terminal diamine to the dropwisely added cyclic ether is 1:2; heating to 90-150 DEG C, and dropwisely adding epoxy chloropropane while stirring, wherein the mol ratio of the dropwisely added epoxy chloropropane to the terminal diamine is 2:1; after the reaction system becomes thicker, keeping the state for at least half an hour, adding a terminator, and continuing the reaction for 1-4 hours to obtain a cationic polyamine polymer sample, wherein the mol ratio of the terminator to the terminal diamine is 2:1. The cationic polyamine polymer can be used as a drilling fluid shale inhibitor. The cationic polyamine polymer contains abundant hydroxy groups, and has favorable water solubility; the cationic polyamine polymer can effectively inhibit the hydration expansion and dispersion of clay; and the cationic polyamine polymer provides certain lubricating property, and is environment-friendly.

Description

Technical field [0001] The invention relates to a cationic polyamine polymer and a preparation method and application thereof, in particular to a cationic polyquaternary amine shale inhibitor for drilling fluid and a preparation method thereof. Background technique [0002] Drilling fluid refers to the general term of various circulating fluids that meet the drilling needs with their multiple functions during oil and gas drilling. The main functions of drilling fluid are: carrying and suspending drill cuttings; stabilizing the borehole wall and balancing formation pressure; cooling and lubricating drill bits and drilling tools; and transmitting water power. With the development of the field of oil and gas exploration, deep wells, ultra-deep wells, ocean wells and wells in complex sections have appeared. During drilling, when drilling into shale formations, the hydration, expansion and dispersion of shale will cause well wall instability. A series of problems such as bit mud pack...

Claims

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Application Information

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IPC IPC(8): C08G73/02C09K8/035
Inventor 鲁娇陈楠杨超张喜文黎元生方向晨
Owner CHINA PETROLEUM & CHEM CORP
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