SU1247412A1 - Lubricant for bearing supports of drilling bits - Google Patents

Description

The invention relates to the field of drilling oil and gas wells and molset be used as a lubricant for bearing supports of drill bits,

The aim of the invention is to improve the adhesion properties of the lubricant.

For the preparation of the lubricant, an alkyl resorcinol epoxyphenol resin (AREPS) 3 Aerosil, graphite, technical paraffin and hydrated calcium plastic grease (lubricant) were used.

The boundary values of the lubricant components are justified by its antifriction properties and the resistance to flushing with water at elevated temperatures. An increase in the content of the AREPS resin with chemical evidence reduces the washability of the lubricant. However, its content is more than 48 May. leads to an increase in the ratio of treni and more than 0.08, which is unacceptable for the bearing supports of drill bits. Experiments have shown that an increase in the AEFA resin content increases the adhesion of lubricant to steel, which also favorably affects its resistance to the research institute of washability.

A decrease in the AREPS resin content of less than 30% increases the washability of the lubricant by more than 15%,

Aerosil in grease resists the setting of rubbing surfaces. Its minimum content to prevent bearing sticking with a residual of 2.5%. The maximum content of 4% is limited by the maximum allowable friction coefficient of 0.08 j which rises with an increase in lubricant retention and air flow,

The graphite powder improves the running-in of rubbing surfaces and its content is limited only by the consistency of the lubricant determined by penetration of 230-340 units. .

A significant disadvantage of the AERPS resin is its increased islamor. Tests according to GOST 9566--74 on

The vapor permeability of the known prototype lubricant for 1 hour showed that it reaches 32%. Introduction I, 5-2, 4% paraffin reduces evaporation of the lubricant by 25-30%.

The following formulations of the proposed lubricants were prepared (Table 1).

  Table 1

Components

Content, mas%, lubricant

ki,

In tab. 2 is the result of testing the lubricants in comparison with the 1 st - lubricant 4.

table 2

As follows from the table. 2, an increase in the content of the AREFS resin in the composition leads to a significant increase in adhesion and its decrease compared to the prototype decreases by 2-3.5 times. Both .THISTHS increase the hermeticity of the bit supports and ensure the increase of the bearing capacity: H -ai-QB,

Claims (2)

LUBRICATION FOR BEARING SUPPORTS OF DRILL BITS, containing alkyl resorcinol epoxyphenol resin, aerosil and graphite powder, which requires that, in order to increase adhesion properties, the lubricant additionally contains paraffin and hydrated calcium calcium grease in the following components, wt. %: Alkylresorcinol epoxyphenol bold Aerosil Graphite powder Paraffin Hydrated Ratio • Calcium Grease 30-48 2.5- 4.0 4.7-7.6 1.5- 2.4 fi £ Rest