Cation coating agent for water-base drilling fluid and preparation method thereof

A water-based drilling fluid and cation technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of unstable performance, increased mud screen loss, and increased system viscosity.

Active Publication Date: 2012-11-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high molecular weight of the polymer, the viscosity of the system increases, and on the other hand, it is easy to cause flocculation, which increases the mud sieve loss and unstable performance.
To solve this problem, low-molecular-weight coating agents of <500,000 have also been used on site, such as the ULTRACAP product of foreign Microbar company, which is expensive and used in large quantities, resulting in high drilling fluid costs

Method used

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  • Cation coating agent for water-base drilling fluid and preparation method thereof
  • Cation coating agent for water-base drilling fluid and preparation method thereof
  • Cation coating agent for water-base drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 600mL of cyclohexane and 2.8g of sorbitan monostearate into a 1000mL four-neck flask, heat to 40°C and stir to dissolve the sorbitan monostearate to obtain an oil phase, and then cool for use. Add 60g of N,N-dimethylacrylamide, 18.2g of diallyldimethylammonium chloride aqueous solution and 40mg of dodecyl mercaptan into a beaker, and dissolve them completely with 50ml of distilled water to obtain monomer solution. Slowly drop the prepared monomer solution into the four-neck flask, blow nitrogen gas for about 30 minutes, and start heating to raise the temperature. When the temperature rose to 55°C, 840 mg of ammonium persulfate solution was added. After a while, the reaction self-heated. After the end of the temperature rise, the temperature was controlled between 65-70° C. to continue the reaction for one hour. After the reaction is completed, start azeotropic water removal, turn on the circulating water vacuum pump, control the vacuum degree (vacuum degree 0.03M...

Embodiment 2

[0029] Add 600mL of cyclohexane and 2.8g of sorbitan monostearate into a 1000mL four-neck flask, heat to 40°C and stir to dissolve the sorbitan monostearate to obtain an oil phase, and then cool for use. Add 60g of N,N-dimethylacrylamide, 20g of methacryloxyethyltrimethylammonium chloride and 45mg of dodecylmercaptan into the beaker, and dissolve them completely with 50ml of distilled water, namely Monomer solution was obtained. Slowly drop the prepared monomer solution into the four-neck flask, blow nitrogen gas for about 30 minutes, and start heating to raise the temperature. When the temperature rose to 55°C, 840 mg of ammonium persulfate solution was added. After a while, the reaction self-heated. After the end of the temperature rise, the temperature was controlled between 65-70° C. to continue the reaction for one hour. After the reaction is completed, start azeotropic water removal, turn on the circulating water vacuum pump, control the vacuum degree (vacuum degree 0...

Embodiment 3

[0031]Add 600mL of cyclohexane and 2.8g of sorbitan monostearate into a 1000mL four-neck flask, heat to 40°C and stir to dissolve the sorbitan monostearate to obtain an oil phase, and then cool for use. Add 60g of N,N-dimethylacrylamide, 18g of acryloyloxyethyltrimethylammonium chloride and 50mg of dodecylmercaptan into a beaker, and dissolve them completely with 50ml of distilled water to obtain a single body solution. Slowly drop the prepared monomer solution into the four-neck flask, blow nitrogen gas for about 30 minutes, and start heating to raise the temperature. When the temperature rose to 55°C, 840 mg of ammonium persulfate solution was added. After a while, the reaction self-heated. After the end of the temperature rise, the temperature was controlled between 65-70° C. to continue the reaction for one hour. After the reaction is completed, start azeotropic water removal, turn on the circulating water vacuum pump, control the vacuum degree (vacuum degree 0.03MPa, 6...

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Abstract

The invention relates to a cation coating agent for water-base drilling fluid and a preparation method thereof, and an application of the cation coating agent in offshore deepwater water-base drilling fluid systems.

Description

technical field [0001] The invention relates to a cationic coating agent for water-based drilling fluid and a preparation method thereof. Background technique [0002] As an important part of water-based drilling fluid, coating agent has been widely used. Its function is to form a protective film on the surface of shale and cuttings, coat and inhibit the hydration and dispersion of cuttings, and avoid swelling and thickening of cuttings. Prevent mutual sticking and increase sieve resistance. At present, a high molecular weight (>3 million) anionic polymer coating agent is used in the water-based drilling fluid system to coat the cuttings produced during the drilling process to prevent the hydration and dispersion of the cuttings. However, due to the large molecular weight of the polymer, the viscosity of the system increases, and on the other hand, it is easy to cause flocculation, which increases the mud sieve loss and unstable performance. To solve this problem, low-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/54C08F226/02C08F220/34C08F2/32C08F2/38
Inventor 李怀科罗健生田荣剑刘志宏段玉龙耿铁易勇
Owner CHINA NAT OFFSHORE OIL CORP
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