High-temperature-resistant nano composite lubricant, and emulsion preparation method and application thereof

Abstract

The invention provides a high-temperature-resistant nano-composite lubricant, and an emulsion preparation method and application thereof.A composition of a high-temperature-resistant monomer, a comonomer and a nano intermediate with a layered structure is adopted. The preparation method comprises the following steps: 1) mixing and stirring the high-temperature-resistant monomer, the comonomer, the inorganic layered structure nano intermediate, an emulsifier, a cross-linking agent and water in an inert atmosphere for 30 minutes to obtain a mixed system; 2) heating the mixed system to 70 DEG C, then adding an initiator, maintaining the temperature, continuously stirring for 7-10 hours, and carrying out a copolymerization intercalation composite reaction to obtain a nano composite emulsion; and (3) mixing the nano-composite emulsion, oleic acid and industrial base oil, stirring for 10 minutes at room temperature, and uniformly mixing, so as to obtain the high-temperature-resistant nano-composite lubricant. The nano-composite microsphere lubricant with extreme pressure anti-wear property has the advantages of nano high-efficiency nucleation property, high temperature resistance, easy dispersibility, good compatibility with a drilling fluid, and high-efficiency lubricity.

Description

technical field [0001] The invention relates to a high-temperature-resistant nanocomposite lubricant, a preparation method and specific application thereof, and belongs to the technical field of oil and gas field engineering. Background technique [0002] With the expansion and deepening of oil and gas exploration and development, the amount of drilling tasks has increased rapidly, and accidents such as drill tool wear, sticking and failure have occurred from time to time, especially in deep wells and ultra-deep wells. Fluid, completion fluid, fracturing fluid or other oil and gas engineering fluids have good high temperature resistance, high temperature lubrication and drag reduction characteristics. [0003] Lubricant is a treatment agent added to drilling, completion or fracturing fluid to improve lubricating performance. Its main function is to reduce the torque, wear and tear of drilling tools and their damage rate. According to the phase state, lubricants are divided ...

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Problems solved by technology

[0008] The deficiency of the prior art lies in that the above-mentioned existing lubricants are generally composed of organic substances, and the organic molecules have poor stability against high temperature, and the molecular chains of the organic substances undergo significant bending, rotation, and gradual fracture under the impact of high temperature, and soon lose their original characteristics.

In response to this problem, the prior art Chinese invention patent CN201810390855.8 discloses a method for developing lubricants through intercalation in-situ polymerization and compounding of layered structure compounds. High polymer monomers and inorganic layered compounds are used to develop high polymer Nanocomposite microsphere antiwear agent and its lubricant composition. However, under long-term high-temperature aging conditions, the molecular chains of polymers are easy to disentangle, and the structure of molecular chains is destroyed. Lubricating components cannot be loaded and the problem of degradation and failure still needs to be solved.

[0009] Similarly, the existing polymer nanocomposite lubricant technology has well-known problems such as nano-agglomeration, that is, the non-uniform distribution of the existing lubricant nanostructure and the non-uniform force under the action of external forces, resulting in its deep underground or ultra-deep layer. Oil and gas reservoir complex working conditions and high temperature and complex working conditions of oil and gas engineering tools use lubrication failure, or it is difficult to produce long-lasting, efficient lubrication, drag reduction and torque reduction effects, resulting in long-term problems such as eccentric wear, shrinkage or stuck pipe accidents , in particular, the existing lubricant technology is difficult to solve the above-mentioned major problems such as the super large torque of engineering tools in deep and ultra-deep high-temperature conditions, the inability to drill continuously, and the greatly reduced efficiency of oil and gas engineering drilling and completion

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