CN204284196U - Low friction resistance high abrasion list is to PDC composite sheet thrust bearing - Google Patents

Abstract

Low friction resistance and high wear resistance single pair PDC composite disc thrust bearing. It belongs to the field of petroleum drilling engineering. It solves the problem of low working life of conventional thrust bearings in mud environment. The thrust bearing includes an upper body and a lower body. A lower concave hole is opened at the center of the lower surface of the upper body, and an upper concave hole symmetrical to the lower concave hole is opened at the center of the upper surface of the lower body. The lower concave hole and the upper concave hole PDC composite sheets are fixed inside, and the polycrystalline diamond sheets at the outer ends of the two PDC composite sheets protrude from the body where they are located, and the two polycrystalline diamond sheets are bonded together. The utility model has the advantages of small friction resistance, low cost and long service life.

Description

Low friction resistance and high wear resistance single pair PDC composite disc thrust bearing

technical field

The utility model belongs to the field of petroleum drilling engineering, in particular to a thrust bearing.

Background technique

Thrust bearings are often used in downhole power drilling tools. Conventional thrust bearings need to work in grease and oil fields. If they work in a mud environment, they often have a short life and cannot meet the requirements of on-site construction. If a sealed oil domain environment that can meet the work of conventional thrust bearings is designed in the downhole power drilling tool, the structure will be complicated, the reliability will be low, and it will be difficult to realize.

Contents of the invention

The purpose of the utility model is to solve the problem of low working life of the conventional thrust bearing in the mud environment, and provide a low friction resistance and high wear resistance single-pair PDC composite thrust bearing.

The low-friction-resistance, high-wear-resistance single-pair PDC composite sheet thrust bearing includes an upper body and a lower body. A concave hole is opened at the center of the lower surface of the upper body, and a concave hole is opened at the center of the upper surface of the lower body, which is symmetrical to the lower body. PDC composite sheets are fixed in the upper concave hole, the lower concave hole and the upper concave hole. The polycrystalline diamond sheets at the outer ends of the two PDC composite sheets protrude from the body where they are located, and the two polycrystalline diamond sheets are bonded together.

The utility model has the following beneficial effects:

PDC composite sheets (full name: polycrystalline diamond compact (PDC), which is made of diamond powder It is sintered with cemented carbide substrate under ultra-high pressure and high temperature conditions, which not only has the high hardness, high wear resistance and thermal conductivity of diamond, but also has the strength and impact toughness of cemented carbide). It slightly protrudes from the body where it is located, so during the process of the upper body and the lower body rotating around the central axis, only the contact surfaces of the polycrystalline diamond sheets on the two PDC composite sheets bear axial force and relatively rub against each other. Because the polycrystalline diamond sheet has the advantages of high hardness, low friction resistance, and strong wear resistance, the low friction resistance and high wear resistance single-pair PDC composite thrust bearing can work in an open mud environment and has low friction resistance. The advantages of low cost and long service life effectively overcome the shortcoming of conventional thrust bearings with low working life in mud environment. After several ground experiments and field experiments, it has been proved that the bearing can work in an open mud environment, and can be widely used in downhole tools that require thrust bearings to improve tool life.

Description of drawings

Fig. 1 is the structural representation of the utility model.

1—upper body; 2—lower body; 3—PDC composite sheet; 4—polycrystalline diamond sheet.

Detailed ways

Below in conjunction with Fig. 1, the utility model is further described:

The low-friction-resistance and high-wear-resistance single-pair PDC composite sheet thrust bearing comprises an upper body 1 and a lower body 2, the center of the lower surface of the upper body 1 is provided with a concave hole, and the center of the upper surface of the lower body 2 is provided with a bottom hole. The concave hole is symmetrical to the upper concave hole, and the PDC composite sheet 3 is fixed in the lower concave hole and the upper concave hole, and the PDC composite sheet 3 can be fixed on the body by brazing or bonding; the outer ends of the two PDC composite sheets 3 The polycrystalline diamond sheets 4 protrude from the body where they are located, and the two polycrystalline diamond sheets 4 fit together. Since the two polycrystalline diamond sheets 4 protrude slightly from the body where they are located, they are wound around the upper body 1 and the lower body 2. During the rotation of the central shaft, only the contact surfaces of the polycrystalline diamond sheets 4 on the two PDC composite sheets 3 bear axial force and relatively rub against each other, because the polycrystalline diamond sheets 4 have the advantages of high hardness, low friction resistance, and strong wear resistance. , so the low friction and high wear resistance single-pair PDC composite thrust bearing can work in the open mud environment, and has the advantages of small friction resistance, low cost and long service life, effectively overcoming the conventional thrust bearing in The disadvantage of low working life in mud environment. The low-friction-resistance and high-wear-resistance single-pair PDC composite sheet thrust bearing is not very demanding on the upper body 1 and the lower body 2, and can be processed on the basis of the original parts to meet the assembly requirements of the upper and lower composite sheets, so it can be used Effectively reduce processing costs. After several ground experiments and field experiments, it has been proved that the bearing can work in an open mud environment, and can be widely used in downhole tools that require thrust bearings to improve tool life.

Claims (1)

1. Low friction resistance and high wear resistance single-pair PDC composite thrust bearing, including upper body (1) and lower body (2), characterized in that: the center of the lower surface of the upper body (1) has a concave hole, The center of the upper surface of the lower body (2) has an upper concave hole that is symmetrical to the lower concave hole, and a PDC composite sheet (3) is fixed in the lower concave hole and the upper concave hole, and the outer ends of the two PDC composite sheets (3) The polycrystalline diamond sheets (4) protrude from the body where they are located, and the two polycrystalline diamond sheets (4) are bonded together.