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Low foamability drilling fluid and its preparation method

A drilling fluid, low-foaming technology, applied in the field of drilling fluids, can solve the problems of foaming, weighting, foam stabilization and difficult to remove, etc.

Active Publication Date: 2006-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alkyl glycosides are surfactants, which have foaming phenomenon during application, and the foam is stable and not easy to remove, and it will increase with the growth of carbon chains, thus limiting ethyl glycosides and alkyl glycosides with longer carbon chains. Application in oilfield cementing fluid and drilling fluid

Method used

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  • Low foamability drilling fluid and its preparation method
  • Low foamability drilling fluid and its preparation method
  • Low foamability drilling fluid and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Take by weighing 100 grams of dry cornstarch with an electronic balance, add 60 grams of anhydrous methanol (chemically pure), 9 grams of sulfuric acid with a concentration of 50% wt, mix uniformly with a stirrer, pour into a reaction kettle equipped with a stirring device, and set the temperature at 85 ± After reacting at 5°C for about 2 hours, take out the reaction product, add 100 grams of dry cornstarch to the reaction product, stir evenly, pour it into the reaction kettle, and react for 1.6 hours to obtain a syrupy viscous liquid; add a concentration of 40% wt The sodium hydroxide solution adjusts the pH value to 9 to obtain a reaction product containing methyl glycoside B1 . Cool down to 55±5°C, then add 110 grams of sodium bisulfite and 100 grams of formaldehyde solution with a concentration of 37% wt, turn on the stirring and continue the reaction for 2 hours to obtain the final reaction product containing sulfomethylated methyl glycoside A1 .

Embodiment 2

[0069] Take by weighing 100 grams of dry cornstarch with a balance, add 100 grams of absolute ethanol (chemically pure), add 15 grams of phosphoric acid (chemically pure) with a concentration of 50% wt, stir and mix evenly with a mixer, and pour into a reaction kettle equipped with a stirring device After reacting at 120°C±5°C for about 4 hours, take out the reaction product, add 100 grams of dry corn starch to the reaction product, stir evenly, pour it into the reaction kettle, and react for 4 hours to obtain a syrupy viscous liquid Add 40% wt of sodium hydroxide solution to adjust the pH value to 11 to obtain a reaction product containing ethyl glycoside B2 . Then cool down to 90±5°C, add 130 grams of sodium bisulfite and 126 grams of acetaldehyde solution with a concentration of 37% wt, turn on the stirring and continue the reaction for 1 hour to obtain the final reaction product containing sulfoethylated ethyl glucoside A2 .

Embodiment 3

[0071] Take by weighing 100 grams of dried cornstarch with an electronic balance, add 100 grams of dehydrated alcohol (chemically pure), 13.5 grams of concentration 37% wt hydrochloric acid, mix uniformly with a stirrer, pour into a reaction kettle equipped with a stirring device, at 130 ± After reacting at 5°C for about 1 hour, take out the reaction product, add 100 grams of dry cornstarch to the reaction product, stir evenly, pour it into the reaction kettle, and react for 0.6 hours to obtain a syrupy viscous liquid; add a concentration of 40% wt sodium hydroxide solution to adjust the pH value to 9 to obtain a reaction product containing ethyl glycoside B3 , lower the temperature to 60±5°C, then add 120 grams of sodium sulfite and 86 grams of formaldehyde solution with a concentration of 37% wt, turn on the stirring and continue the reaction for 2 hours to obtain the final reaction product containing sulfomethylethylglucoside A3 .

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Abstract

The invention relates to low-foamability drilling fluid as modified auxiliary agent composed of slurry and modified alkyl glycoside, wherein, the volume of modified auxiliary agent is 1-50% of slurry, and prepared by: mixing starch and low-carbon alcohol for glycosidation with catalyst to obtain material contained with low-carbon alkyl glycoside; adding sulphonating agent and aldehyde for further reaction at (50-100)+ / -5Deg to obtain the final product. The product has better adsorption, action ability with bentonite, and viscosity reduction ability, and fits to middle-deep well or ultradeep well.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a low-foaming drilling fluid containing an alkyl glycoside compound modified by a sulfoalkyl group and a preparation method thereof. Background technique [0002] Alkyl glycosides are a new generation of environmentally friendly green surfactants, which were industrialized in foreign countries in the 1990s. It is a nonionic surfactant made from glucose and fatty alcohols derived from renewable natural resources, and the alkyl glycosides are fully biodegradable. This type of surfactant is widely used in the fields of detergent, cosmetics, food and medicine due to its non-toxicity, non-irritation and excellent surface activity. According to the length of the fatty alcohol carbon chain used in its synthesis, it is divided into low-carbon alkyl glycosides (alkyl is C1 ~ C7) and high-carbon alkyl glycosides (alkyl is C8 and above). [0003] Current High Carbon C 8-18 A series of alkyl glycosides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
Inventor 肖超赵素丽宋明全蔡利山王文立江山红王治法
Owner CHINA PETROLEUM & CHEM CORP
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