Thermo-sensitive and controllable-release lubricant used for well drilling fluid and preparation method for lubricant

A temperature-sensitive drilling fluid technology, applied in the field of drilling fluid lubricants, can solve the problems of high drilling fluid cost, short action time, complex lubricant production process, etc., and achieve the effect of easy promotion and simple preparation method

Active Publication Date: 2017-12-12
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the inventors found that the above two lubricants still have certain defects. On the one hand, the existing lubricant production process is relatively complicated, the production cost is high, and there is certain fluorescence interference, so it cannot be used in exploration wells and pre-exploration wells; on the other hand , the existing lubricant dissipates quickly during use in the formation, and the action time is short. As the well depth increases and the drilling time increases, the lubricating effect of the lubricant decreases, and the amount needs to be increased at any time, which makes the cost of drilling fluid higher

Method used

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  • Thermo-sensitive and controllable-release lubricant used for well drilling fluid and preparation method for lubricant
  • Thermo-sensitive and controllable-release lubricant used for well drilling fluid and preparation method for lubricant

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add 15g of 7# white oil into the reaction vessel, heat to 60°C; slowly add 10g of oleic acid amide during stirring, after the dissolution is complete, add 3g of monopalmitic acid polyoxyethylene sorbitan, add 2g of 601# Nano-calcium carbonate (produced by Fujian Hongfeng Nano Technology Co., Ltd.), stir again, and add in about 50 minutes; slowly add 40.5g of water to the above reactor, stirring at a speed of 500 r / min, after the addition is completed, add 3g of polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO-PPO-PEO) block copolymer, maintain the temperature at 60°C during the process, continue to stir for 30min; reduce the temperature of the reactor to 30°C, add 1g of dehydrated sorrel Alcohol monopalmitate, add 25.4g of water, increase the stirring speed to 5000 r / min, add 0.1g of antifoaming agent simethicone to defoam, continue stirring for 30min, cool to room temperature, and discharge to obtain drilling fluid Controlled-release lubricants with temperature se...

Embodiment 2

[0025] Add 20g of 15# white oil into the reaction vessel, heat to 70°C; slowly add 15g of oleic acid amide during stirring, after the dissolution is complete, add 4.5g of polyoxyethylene sorbitan monostearate, add 4g 602# nano-calcium carbonate, stir evenly again, and finish adding in about 50 minutes; slowly add 28.5g of water to the above reactor at a stirring speed of 500R / min, after the addition is completed, add 4.5g of PEO-PPO-PEO embedded Segment copolymer, keep the temperature at 70°C during the process, continue to stir for 30min; reduce the temperature of the reactor to 40°C, add 2g of sorbitan monostearate, add 21.2g of water, and increase the stirring speed to 5000 r / min During the process, add 0.3g of antifoaming agent simethicone to defoam, continue to stir for 30 minutes, cool to room temperature, and discharge to obtain a temperature-sensitive controllable release lubricant for drilling fluid.

Embodiment 3

[0027] Add 25g of 24# white oil into the reaction vessel, heat to 70°C; slowly add 20g of oleic acid amide during stirring, after the dissolution is complete, add 6g of monooleic acid polyoxyethylene sorbitan, add 5g of 603# Nano-calcium carbonate, stirred evenly again, and finished adding in about 50 minutes; slowly added 20g of water to the above reactor at a stirring speed of 500 r / min, after the addition was completed, added 6g of PEO-PPO-PEO block copolymer L94, maintain the temperature at 70°C during the process, and continue to stir for 30 minutes; reduce the temperature of the reactor to 50°C, add 3g of sorbitan monooleate, add 14.5g of water, increase the stirring speed to 5000 r / min, and add 0.5g of antifoaming agent simethicone to defoam, continue to stir for 30 minutes, cool to room temperature, and discharge to obtain a temperature-sensitive controllable release lubricant for drilling fluid.

[0028] The following test was further carried out to test the lubricati...

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Abstract

The invention relates to the technical field of well drilling fluid lubricants, and especially relates to a thermo-sensitive and controllable-release lubricant used for a well drilling fluid and a preparation method for the lubricant. According to the lubricant, an interface synergistic effect of a composite surfactant and nano particles is adopted to control emulsion stability, a thermo-sensitive polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (PEO-PPO-PEO block copolymer) is added to control the release speed of the lubricant, and the lubricant has the characteristics of high lubricating performance, persistent usage, a temperature controllable release and the like. The thermo-sensitive and controllable-release lubricant used for the well drilling fluid comprises the following components, in percent by mass: 15-25% of white oil, 10-20% of oleamide, 3-6% of the PEO-PPO-PEO block copolymer, 2-5% of nano calcium carbonate, 3-5% of polyoxyethylene sorbitan fatty acid ester, 1-3% of sorbitan fatty acid ester, 0.1-0.5% of an antifoaming agent, and the balance of water.

Description

technical field [0001] The invention relates to the technical field of drilling fluid lubricants, in particular to a temperature-sensitive controllable release lubricant for drilling fluid and a preparation method thereof. Background technique [0002] Complex formations are often encountered during oil and gas drilling, especially in high-density wells or highly deviated wells or extended-reach wells. The friction between the drilling fluid, drilling tools and formations is very high, which eventually leads to the The drilling pressure is very low, and there is basically no footage; in addition, excessive friction will cause complex accidents such as adhesion pressure difference and drill sticking. In order to reduce the friction of the drilling fluid, it is necessary to add a lubricant to the drilling fluid to reduce the phenomenon of differential pressure sticking, reducing the wear of the drilling tool and excessive torque. The role of the lubricant is mainly to reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/035
CPCC09K8/03C09K8/035C09K2208/10C09K2208/34
Inventor 蓝强徐运波张鹏郑成胜张敬辉李公让于雷吴雄军张妍
Owner 中石化石油工程技术服务有限公司
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