US 10,030,188 B2 · Nano-hybrid lubricant and method thereof, and oil-based drilling fluid

Abstract

The present invention relates to the well drilling field in petroleum industry, in particular to a nano-hybrid lubricant and method thereof, and oil-based drilling fluid. The lubricant comprises: graphite oxide and a biquaternary ammonium salt compound of which the cation part is represented by formula (1). The present invention also provides a method for preparation of the lubricant and an oil-based drilling fluid containing the lubricant. The lubricant provided in the present invention can be comprehended as a nano-hybrid material. Thus, oil-based drilling fluids that contain the lubricant provided in the present invention have lower lubrication coefficient and excellent lubricating property without or with little negative impact on rheological property of the oil fluid, and the lubricant provided in the present invention has excellent thermostability thus suitable for use in operation at a high temperature.

Claims17

Dependent claims

A lubricant comprising:

a) graphite oxide;
and
b) a biquaternary ammonium salt compound, wherein the cation of the biquaternary ammonium salt compound is represented by formula (1);
wherein the biquaternary ammonium salt compound adheres to the surface of the graphite oxide and optionally adheres to the graphite oxide between layers of the graphite oxide;
and
part of the biquaternary ammonium salt compound is linked to the graphite oxide in the form of a modifying group, wherein the cation of the modifying group is represented by formula (2):
wherein each R1 group is independently selected from H, hydroxyl, halogen, C1-C6 alkyl, C1-C6 alkoxy, and C1-C6 hydroxyalkyl;
each R2 group is independently selected from H and C1-C6 alkyl;
and each R3 group is independently selected from n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, undecyl, and dodecyl,
wherein a weight ratio of the graphite oxide to the biquaternary ammonium salt compound is 1:
48-250.

8 more elements

Dependencies are inferred from the claim text.

Nano-hybrid lubricant and method thereof, and oil-based drilling fluid

Life of this patent

Nano-hybrid lubricant and method thereof, and oil-based drilling fluid

Life of this patent

Abstract

Claims17