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Viscosifier for drilling fluid and preparation method thereof

A technology of drilling fluid and viscosifier, which is applied in the direction of chemical instruments and methods, drilling compositions, etc. It can solve the problem that the high temperature resistance performance cannot meet the high temperature construction requirements, the viscosifying effect of the viscosifier decreases rapidly, and the viscosifier cannot To meet the construction requirements and other issues, to achieve a wide range of practical application prospects and economic benefits, good viscosity-increasing effect, and good viscosity-increasing performance

Active Publication Date: 2013-05-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing drilling fluid viscosifiers, such as 80A-51, cannot well meet the needs of high-temperature construction. Most of the viscosifiers decrease rapidly or even disappear completely when the viscosity is higher than 150°C.
[0004] Chinese patent CN20100593450 discloses a drilling fluid anti-high temperature thickening agent, which uses natural products such as starch and guar gum and alkaline hydroxides and epoxides as main components, but a large amount of organic solvents need to be added in the preparation process, which is harmful The environment has adverse effects, and the prepared tackifier cannot meet the construction requirements higher than 150°C; Chinese patent CN201110184384 discloses a polyacrylamide tackifier, which has certain salt and calcium resistance properties, but high temperature resistance It cannot meet the requirements of high-temperature construction; Chinese patent CN201010172382 discloses a 2-acrylamide-2-methylpropanesulfonic acid, acrylamide and acrylic acid copolymer tackifier, which can effectively adjust the flow pattern, flocculate coated drill cuttings, Inhibit shale hydration and dispersion, but cannot meet the construction requirements higher than 200 °C

Method used

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  • Viscosifier for drilling fluid and preparation method thereof
  • Viscosifier for drilling fluid and preparation method thereof
  • Viscosifier for drilling fluid and preparation method thereof

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preparation example Construction

[0027] The invention provides a kind of preparation method of drilling fluid viscosifier, comprising:

[0028] A) Add a basic compound to the mixed solution to adjust the pH value to 6.0-8.0 to obtain a reaction solution; the mixed solution includes non-ionic water-soluble monomers, anionic water-soluble monomers, cationic hydrophobic monomers and deionized water; or include nonionic water-soluble monomers, cationic water-soluble monomers, anionic hydrophobic monomers, and deionized water;

[0029] B) mixing the reaction solution obtained in step A) with an initiator, and performing a polymerization reaction to obtain a drilling fluid viscosity enhancer;

[0030] The cationic hydrophobic monomer has the structure shown in formula (I):

[0031]

[0032] Among them, R 1 from C 8 ~C 16 The alkyl group, m is 2 or 3; X is Cl, Br or I;

[0033] The anionic hydrophobic monomer has the structure shown in formula (II):

[0034]

[0035] where R 2 Choose from H or C 1 ~C ...

Embodiment 1

[0066] Add 8.8g of N,N-dimethylethylenediamine, 10mL of dichloromethane and 11g of sodium carbonate into the three-necked flask, stir, and put it in an ice-water bath; add 25mL of dichloromethane into the dropping funnel, and then pipette Add 10g of acryloyl chloride into the tube, mix well and drop into the three-necked flask, control the titration rate to 3-4 drops per minute, stir and react for 0.5 hours after the dropwise addition, and keep the temperature below 5°C during the whole dropping process. After the reaction was finished, the product was suction filtered to remove the solid, and the filtrate was washed twice with a saturated sodium carbonate solution and once with a saturated sodium chloride solution; Extract with methyl chloride, then separate the liquids, combine the lower clear liquid with the previous lower clear liquid, then dry with anhydrous magnesium sulfate, and let it stand overnight; filter the dried liquid to remove the magnesium sulfate solid, and th...

Embodiment 2

[0075] Add 10g of N,N-dimethyl-1,3-propanediamine, 11mL of dichloromethane and 11g of sodium carbonate into a three-necked flask, stir, and put it in an ice-water bath; add 18mL of dichloromethane into the dropping funnel, Then add 10g of acryloyl chloride with a pipette, mix well and drop it into a three-necked flask, control the titration rate to 3-4 drops per minute, stir and react for 0.5 hours after the dropwise addition, keep the temperature below 5°C during the whole dropping process . After the reaction was finished, the product was suction filtered to remove the solid, and the filtrate was washed twice with a saturated sodium carbonate solution and once with a saturated sodium chloride solution; Extract with methyl chloride, then separate the liquids, combine the lower clear liquid with the previous lower clear liquid, then dry with anhydrous magnesium sulfate, and let it stand overnight; filter the dried liquid to remove the magnesium sulfate solid, and then carry ou...

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Abstract

The invention discloses a viscosifier for drilling fluid and a preparation method thereof. An amphiprotic hydrophobic association type water-soluble viscosifier for drilling fluid is prepared by steps of mixing water-soluble monomers with hydrophobic monomers to perform a polymerization reaction, wherein the water-soluble monomers and the hydrophobic monomers have different ion categories. Amphiprotic ionic groups simultaneously exist in the structure of the viscosifier for drilling fluid provided by the invention to effectively absorb or bridge clay particles so as to guarantee an excellent tackifying effect; meanwhile, the ionic water-soluble monomers can be used for greatly improving the content of hydrophobic units in the polymer structure through hydrophilic ionic groups on the condition of high macromolecular water-solubility; and the ionic hydrophobic monomer units are introduced to guarantee the tackifying effect and water loss reduction effect of the viscosifier under high-temperature and high-salt conditions through hydrophobic association. As shown in an experimental result, the viscosifier provided by the invention still has excellent tackifying performance when the temperature is as high as 260 DEG C, and meanwhile, the viscosifier has excellent high-temperature and high-pressure water loss performance, so that the viscosifier has extensive practical application prospect and economic benefit.

Description

technical field [0001] The invention relates to the technical field of petroleum, in particular to a drilling fluid viscosifier and a preparation method thereof. Background technique [0002] With the continuous expansion of demand for oil and natural gas, oil and gas exploitation has gradually entered the development stage of complex geological conditions such as deep wells and ultra-deep wells. The higher and higher bottom-hole construction temperature and circulation temperature put forward the actual demand of high temperature resistance for related additives in the petroleum industry. Drilling fluid is the first fluid that comes into contact with oil and gas reservoirs. Its performance plays a vital role in ensuring wellbore stability and improving well completion quality. Therefore, improving the high temperature resistance of drilling fluid is an urgent problem to be solved at present. . [0003] In the prior art, the high temperature resistance of drilling fluid is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/60C08F220/54C08F220/34C08F220/58C09K8/035
Inventor 徐昆宋春雷谭颖王丕新刘畅路璀阁李鹏翀
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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