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Highly-efficient lubricant for drilling fluid

A technology for lubricants and drilling fluids, applied in the field of lubricants, can solve the problems of increasing the usage amount and reducing the lubrication efficiency of lubricants, and achieves the effects of improving lubricity, reducing the adhesion coefficient and preventing dry friction

Inactive Publication Date: 2010-06-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only will it not foam, but it will not change the alkalinity value of the drilling fluid, nor will it form flocs in the drilling fluid and paste the screen; the lubricant of conventional drilling fluid does not contain anti-wear agents and extreme pressure agents , the extreme pressure value is mostly between 100-350N. When drilling high-inclination directional wells, horizontal wells, high-density deep wells, and diamond coring, the lubrication efficiency of conventional lubricants is significantly reduced, and the amount of use must be increased to smooth drill into

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare the lubricant as follows:

[0022] 1) Weigh various raw materials according to the following components: 13% white oil, 63% fatty acid methyl ester, 10% oleic acid ester of pentaerythritol, 6% phosphoric acid ester, 6% boron molybdenum type extreme pressure agent, 1% emulsifier OP-10 and 1% Span-80; the percentages here are percentages by weight.

[0023] 2) white oil is added in the reactor;

[0024] 3) Start stirring, add fatty acid methyl ester, oleic acid ester of pentaerythritol, phosphoric acid ester, boron molybdenum type extreme pressure agent and emulsifier OP-10 and Span-80 in sequence;

[0025] 4) Turn on the temperature controller;

[0026] 5) heat up to 60°C, keep stirring for 30 minutes;

[0027] 6) Stop stirring, pack and discharge.

[0028] The high-efficiency lubricant processed by the above-mentioned processing method has an extreme pressure value between 1764-1863N. In 6% earth-moving mud, when the amount is 1%, the torque drop is 86%. (T...

Embodiment 2

[0032] Weigh various raw materials according to the following components: 40% white oil, 30.5% methyl oleate, 4% phosphoric acid ester, 20% oleate of pentaerythritol, 5% boron molybdenum type extreme pressure agent , 0.5% emulsifier and 0.5% Span S-80; the percentages here are percentages by weight. All the other steps are the same as in Example 1.

[0033] The high-efficiency lubricant processed by the above-mentioned processing method has an extreme pressure value of 1470N, and the torque drop is 88% when the amount is added to 1% in 6% earth-moving slurry.

Embodiment 3

[0035] Weigh various raw materials according to the following components: 10% white oil, 70% methyl oleate, 5% oleate of pentaerythritol, 8% phosphate, 6% boron molybdenum type extreme pressure agent , 0.5% emulsifier OP-10 and 0.5% Span-80; the percentages here are percentages by weight. All the other steps are the same as in Example 1.

[0036] The high-efficiency lubricant processed by the above-mentioned processing method has an extreme pressure value of 1813N. In 6% earth-moving mud, when the amount is 1%, the torque drop is 87%.

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PUM

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Abstract

The invention discloses a highly-efficient lubricant for a drilling fluid. The highly-efficient lubricant comprises the following components in percentage by weight: 10 to 40 percent of white oil, 30 to 70 percent of fatty acid methyl ester or methyl oleate, 5 to 20 percent of polyester, 2 to 8 percent of organic phosphate, 1 to 6 percent of oilness extreme-pressure additive, 0.5 to 2 percent of emulsifier OP-10 and 0.5 to 2 percent of span-80. The invention also discloses a method and steps for preparing the highly-efficient lubricant for the drilling fluid. The highly-efficient lubricant can enhance the lubricating property of the drilling fluid and increase an extreme pressure value of the drilling fluid, and is suitable for the demand of ordinary drilling and use in a high-difficulty highly deviated directional well and a horizontal well.

Description

technical field [0001] The present invention relates to a lubricant for drilling fluid. Background technique [0002] With the rapid development of oil and gas and geological exploration and development, modern drilling technology puts forward higher requirements for drilling fluid. During the drilling process, in order to increase the drilling speed, prolong the life of the drill bit, reduce the number of trips, reduce the mud bag of the drill bit and the drill collar, and achieve fast drilling, lubricant must be added to reduce the torque and the adhesion coefficient of the mud cake. At present, there are many kinds of drilling fluid lubricants, mainly lubricants that improve the torque reduction rate. Most of them are emulsion type drilling fluid lubricants based on mineral oil and vegetable oil. In addition, there are some drilling fluid lubricants. Liquid lubricant is a simple aqueous solution of surfactant, which is added to the drilling fluid to form an oil-in-water ...

Claims

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Application Information

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IPC IPC(8): C09K8/035
Inventor 李银素高冬梅黄献西苗海龙张荣李伟陈俊生
Owner CHINA NAT OFFSHORE OIL CORP
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