Oil-based drilling fluid lubricant and preparation method thereof

Abstract

The invention discloses an oil-based drilling fluid lubricant which is prepared from the following components by mass percent: 0.1% to 15% of mud cake adhesion lubricating improver, 0.5% to 30% of extreme pressure additive, 0% to 4% of flow type regulator and the balance of white oil. The invention further provides a preparation method of the oil-based drilling fluid lubricant. The oil-based drilling fluid lubricant has a good extreme pressure lubricating ability and a good mud cake adhesion lubricating ability. When the adding amount of the lubricant in a drilling fluid reaches 0.5% (percent by volume), the mud cake adhesion friction reducing rate is between 56% and 78%, and the extreme pressure friction reducing rate is between 76% and 96%. In addition, the oil-based drilling fluid lubricant is strong in high-temperature resistance and low in fluorescence grade.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a low-fluorescence and high-temperature-resistant oil-based lubricant for drilling fluid and a preparation method thereof. Background technique [0002] There are many kinds of drilling fluid lubricants, among which oil-based lubricants containing emulsifiers are widely used and extremely important. Oil-based drilling fluid lubricants mainly reduce friction loss through two modes of action during drilling. One way is to form a dense, extreme pressure-resistant and friction-reducing chemical film on the metal surfaces of the drill tool and the casing to achieve lubrication between the drill tool and the casing. This lubrication method is called extreme pressure lubrication; The other is that the lubricant is adsorbed on the mud cake, and the lubrication between the drilling tool and the open hole wall is realized by improving the lubricity of the mud cake, which is called mud ca...

AI Technical Summary

Problems solved by technology

At present, the domestic development of oil-based lubricants based on mineral oil is mainly concentrated on extreme pressure lubrication, ignoring the research and application of mud cake adhesion lubrication performance, resulting in the current oil-based lubricants based on mineral oil Lubricant-like lubricants are excellent in extreme pressure lubrication performance, but relatively insufficient in mud cake adhesion lubrication performance

In addition, although the modified vegetable oil lubricant has superior performance in extreme pressure lubrication and mud cake adhesion friction, it still has the problem of poor temperature resistance, and it is easy to saponify in the drilling fluid, causing the drilling fluid to foam.

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