A high-temperature-resistant high-efficiency environment-friendly full ester-based drilling lubricant and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant, efficient and environmentally-friendly full-ester-based drilling lubricant and a preparation method thereof. Polypropylene oxide, trimethylolpropane sebacate and isophorone diisocyanate methyl oleate react with trihydroxymethylpropionate, diglycol and stannous octoate to generate trimethylolpropane sebacate modified polyurethane, the trimethylolpropane sebacate modified polyurethane is mixed with ricinoleic acid, diethanol amine and boric acid, nitrogen is introduced by using a two-step decompression method in a continuous circulation way to generate trimethylolpropane mixed ester, and the trimethylolpropane mixed ester finally reacts with boronized amino ester to prepare the high-temperature-resistant, efficient and environmentally-friendly full-ester-based drilling lubricant. The novel high-temperature-resistant, efficient and environmentally-friendly full-ester-based drilling lubricant is prepared by introducing the nitrogen through a three-step reaction in the continuous circulation way and the two-step decompression method. The hydraulic friction, the viscosity coefficient of a mud cake, the torque of a drill column and the axial resistance can be greatly reduced by the lubricant, and the energy consumption is reduced; the trip time can be better shortened, the working resistance of a drill bit is reduced, and the service life of the drill bit is prolonged, so that the excellent properties such as the drilling working efficiency are improved.

Description

technical field [0001] The invention relates to a drilling lubricant and a preparation method thereof, in particular to a high-temperature-resistant, high-efficiency, environmentally friendly all-ester-based drilling lubricant and a preparation method thereof, which can be used for drilling under complex well conditions such as deep wells, horizontal wells, and high-inclination directional wells. Use, suitable for drilling fluid lubricants in fresh water, salt water, and sea water. Background technique [0002] As the world's demand for petroleum energy continues to increase, the amount of petroleum extracted is increasing, and the demand for drilling lubricants is also growing rapidly. The current lubricants still use refractory and polluting mineral oil as the basic raw material. This will inevitably be limited by increasingly stringent environmental protection requirements. [0003] Environmentally friendly drilling fluid lubricants mainly include vegetable oils, polyeth...

AI Technical Summary

Problems solved by technology

[0006] 1. A large amount of mineral oil is used, which cannot be degraded and pollutes the ocean

[0007] 2. The lubricating effect is not good, and the torque reduction rate of soil moving slurry is only 65%.

[0008] 3. The temperature resistance is not good, the high temperature is only 120 ℃.

[0009] 4. The extreme pressure performance is poor, the diameter of the wear spot is as high as 0.7mm and the maximum non-jamming value is only 392N.

[0010] 5. Poor compatibility with PEM and PEC systems, selective