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Preparation and application methods of high-temperature-resistant lubricant for drilling fluid

A drilling fluid, high temperature resistant technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as reduction of common lubricants, inability to meet the lubrication requirements of drill bit bearings and drilling tools, loss of lubrication effect, etc.

Inactive Publication Date: 2014-04-16
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in deep wells and ultra-deep wells, the bottom of the well is in a state of high temperature, and ordinary lubricants will greatly reduce or lose their lubricating effect, which cannot meet the lubrication requirements of drill bit bearings and drilling tools

Method used

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  • Preparation and application methods of high-temperature-resistant lubricant for drilling fluid
  • Preparation and application methods of high-temperature-resistant lubricant for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Under stirring, sequentially add 100 parts of waste animal and vegetable oils, 8 parts of triethanolamine and 2 parts of concentrated sulfuric acid to the reactor, and react at 120°C for 3 hours;

[0020] 2) Cool the reacted product to 60°C, add 20 parts of fatty acid methyl ester and 50 parts of white oil to the reaction kettle that continues to stir, and stir for 1 hour;

[0021] 3) Add 3 parts of molybdenum disulfide to the stirring reactor and stir for 1h;

[0022] 4) Cool to normal temperature to prepare the high temperature resistant lubricant for drilling fluid.

Embodiment 2

[0024] 1) Under stirring, sequentially add 120 parts of waste animal and vegetable oils, 12 parts of triethanolamine and 5 parts of concentrated sulfuric acid to the reaction kettle, and react at 140°C for 3 hours;

[0025] 2) Cool the reacted product to 80°C, add 50 parts of fatty acid methyl ester and 50 parts of white oil to the continuously stirred reactor, and stir for 2 hours;

[0026] 3) Add 10 parts of molybdenum disulfide to the stirring reactor and stir for 3h;

[0027] 4) Cool to normal temperature to prepare the high temperature resistant lubricant for drilling fluid.

Embodiment 3

[0029] 1) Under stirring, sequentially add 110 parts of waste animal and vegetable oils, 10 parts of triethanolamine and 3 parts of concentrated sulfuric acid to the reactor, and react at 125°C for 4 hours;

[0030] 2) Cool the reacted product to 70°C, add 50 parts of fatty acid methyl ester and 20 parts of white oil to the continuously stirred reactor, and stir for 2h;

[0031] 3) Add 5 parts of molybdenum disulfide to the stirring reactor and stir for 2h;

[0032] 4) Cool to normal temperature to prepare the high temperature resistant lubricant for drilling fluid.

[0033] The method of using the anti-high temperature lubricant for drilling fluid prepared by the method of the present invention is as follows: adding 0.5-3% of the lubricant based on the volume of the drilling fluid to the formulated density of 1.8-2.0 g / cm 3 In the drilling fluid, high-speed stirring for 30 minutes is enough.

[0034] The lubricants prepared in the above 3 examples were added to drilling fluids of diffe...

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Abstract

The invention discloses a preparation method of a high-temperature-resistant lubricant for a drilling fluid, which comprises the following steps: 1) while stirring, sequentially adding 100-120 parts by mass of waste animal and vegetable oil, 8-12 parts by mass of triethanolamine and 2-5 parts by mass of concentrated sulfuric acid into a reaction kettle, and reacting at 120-140 DEG C for 3-5 hours; 2) cooling the reaction product to 60-80 DEG C, adding 20-50 parts by mass of fatty acid methyl ester and 20-50 parts by mass of white oil into the reaction kettle in the stirring state, and stirring for 1-2 hours; 3) adding 3-10 parts by mass of molybdenum disulfide into the reaction kettle in the stirring state, and stirring for 1-3 hours; and 4) cooling to normal temperature to obtain the high-temperature-resistant lubricant for a drilling fluid. The lubricant has the characteristics of high lubricating efficiency and high temperature resistance; after rolling at 190 DEG C for 16 hours, the lubricating factor decreasing rate can still reach 50% above; and thus, the lubricant can satisfy the lubricating demands for deep wells and ultradeep wells.

Description

Technical field [0001] The invention relates to the field of oil and natural gas drilling, in particular to a method for preparing and using a high-temperature resistant lubricant for drilling fluid. Background technique [0002] The lubrication and anti-seize problem of drilling fluid is a technical problem that is often encountered in drilling engineering, especially in the process of drilling complex wells such as deep wells, ultra-deep wells and horizontal wells. Deep wells and ultra-deep wells not only have deep reservoirs, but also have high downhole temperatures and pressures and long operating hours, which are prone to complex situations such as well collapse, lost circulation, and overflow. In order to balance the formation pressure, a high-density and high-solid content mud is usually used, and this high-density mud will increase the rheological resistance of the drilling fluid, resulting in a substantial increase in the rotation resistance of the drill string and the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
CPCC09K8/035C09K2208/28C09K2208/34
Inventor 李广环田增艳杨俊贞马运庆苏君冯超
Owner CNPC BOHAI DRILLING ENG
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