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A kind of clay stabilizer and its application

A clay stabilizer and reaction technology, which is applied in the field of clay stabilizer preparation, can solve the problems of high molecular weight, low anti-swelling rate, and formation damage of polymer clay stabilizers, and achieve the purpose of inhibiting hydration expansion and dispersion migration, preventing The effect of high expansion rate and high degree of adsorption

Active Publication Date: 2020-09-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of large dosage of existing clay stabilizers, low anti-swelling rate, high molecular weight of polymer clay stabilizers, and easy formation damage. The present invention provides a preparation method of clay stabilizers

Method used

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  • A kind of clay stabilizer and its application
  • A kind of clay stabilizer and its application
  • A kind of clay stabilizer and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 1.2 mol of trimethylamine into a three-necked flask, add 10 mol of distilled water under stirring conditions, slowly add 0.5 mol of epichlorohydrin dropwise through a constant pressure dropping funnel, control acceleration to keep the temperature below 20°C, and keep warm for 1 hour after dropping; Add 0.5mol epichlorohydrin, gradually raise the temperature to 90-95°C and react for 2 hours; then add 0.4mol triethylenetetramine, add 0.5mol epichlorohydrin dropwise, raise the temperature to 65-70°C and react for 2 hours, and the product is vacuum-dried Get clay stabilizers.

[0027] Infrared characterization of the clay stabilizer was carried out by figure 1 It can be seen that 1250cm -1 、980cm -1 It is the characteristic absorption peak of C-N, 2900~3000cm -1 It is the C-H stretching vibration peak in methyl and methylene, and there is no N-H absorption peak in this figure, 3330cm -1 The hydroxyl peak at place is the characteristic peak of water after the potassi...

Embodiment 2

[0030] Add 1.2 mol of dimethylamine into the three-necked flask, add 10 mol of distilled water under stirring conditions, slowly add 0.4 mol of epichlorohydrin dropwise using a constant pressure dropping funnel, control the acceleration to keep the temperature below 20°C, and keep warm for 1 hour after the dropping is completed; then Then add 0.4mol epichlorohydrin, and gradually raise the temperature to 80-85°C for 2 hours; then add 0.4mol triethylenetetramine, add 0.4mol epichlorohydrin dropwise, raise the temperature to 65-70°C for 2 hours, and dry the product under vacuum Then get clay stabilizer.

[0031] After testing, the stabilizer contains quaternary ammonium groups. The range of number average molecular weight is about 250-5000, among which the number average molecular weight of about 250-1300 accounts for 85%.

Embodiment 3

[0033] Add 1.5 mol of dimethylamine into the three-necked flask, add 15 mol of distilled water under stirring conditions, slowly add 0.7 mol of epichlorohydrin dropwise using a constant pressure dropping funnel, control the acceleration to keep the temperature below 20°C, and keep warm for 1 hour after the dropping is completed; then Then add 0.8mol epichlorohydrin, and gradually raise the temperature to 80-85°C for 2 hours; then add 0.4mol triethylenetetramine, add 0.2mol epichlorohydrin dropwise, raise the temperature to 65-70°C for 2 hours, and dry the product under vacuum Then get clay stabilizer.

[0034] After testing, the stabilizer contains quaternary ammonium groups. The range of the number average molecular weight is about 250-5000, among which the number average molecular weight is about 250-1300 accounting for 55%.

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Abstract

The present invention relates to a preparation method of a clay stabilizer for low permeability stratum. The preparation method sequentially comprises: adding epichlorohydrin to the aqueous solution of a monoaliphatic amine, carrying out a reaction for a certain time, adding epichlorohydrin, heating, carrying out a reaction, adding polyamine, adding epichlorohydrin, carrying out a reaction, and drying to obtain the clay stabilizer.

Description

technical field [0001] The invention relates to the field of additives used in oil and gas exploitation, in particular to a preparation method and application of a clay stabilizer. Background technique [0002] Oil and gas reservoirs in my country all contain a certain amount of clay minerals. When the clay content in the reservoir is high (for example, the average clay content of shale gas reservoirs in the Fuling area of ​​southeast Sichuan in my country is 32%, and it reaches 40%-60% in the Dingshan area. , up to 20%-50% in Pengshui area), when drilling, cementing, water injection, fracturing, acidification, workover and other water-based working fluids invade, it is very easy to cause clay minerals to expand, disperse and migrate, which may block the formation pores The throat of the structure reduces the permeability of the formation, reduces the production of oil wells, and causes damage to oil and gas layers, so clay stabilizers must be added. [0003] Clay stabilizers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/68
CPCC09K8/035C09K8/607C09K8/68C09K2208/12
Inventor 曾义金杨帆杨小华林永学王琳董晓强王海波孔勇何剑
Owner CHINA PETROLEUM & CHEM CORP
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