Composite metal sealing mechanism for tricone bit

Abstract

The invention relates to a geological drilling tool and in particular relates to a composite metal sealing mechanism for a tricone bit. The composite metal sealing mechanism comprises a wheel ring, a palm ring and rubber rings respectively matched with the wheel ring and the palm ring, wherein annular central rings are arranged in annular slots of the wheel ring and the palm ring; annular grooves matched with the central rings are formed on the rubber rings; and the annular grooves are buckled on the annular central rings, so that the wheel ring and the palm ring are respectively connected with the rubber rings to form a whole. The central ring is additionally arranged in the wheel ring, so that the intensity and flexibility of the wheel ring can be improved; the central ring and one of the rubber rings are integrated, so that secondary sliding is reduced, and the sealing degree is increased; due to proper pressure, the whole wheel ring is firmly and statically attached in a cone, so that a sealing effect is achieved; according to the same mode, the palm ring is additionally provided with the central ring, so that the intensity and flexibility of the wheel ring can be improved; the central ring and the other rubber ring are integrated, so that sliding is reduced, and the sealing degree is increased; and due to proper pressure, the whole palm ring is firmly and statically wrapped on the neck of a cone palm, so that the optimal sealing effect is achieved.

Description

technical field [0001] The invention relates to geological drilling tools, in particular to a three-cone bit composite metal sealing mechanism. Background technique [0002] Due to the continuous development of petroleum resources, the number of conventional recoverable resources is getting less and less, and the oil has gradually been exploited in deeper layers. The difficulty of mining is increasing, and the requirements for the use of drilling machinery are getting higher and higher. In the past, the use of conventional drilling machinery seals It can no longer meet the needs of oil drilling. At present, the sealing structure of the roller cone bit in the prior art is that two metal rings (the palm ring and the wheel ring) rub against each other to maintain a sealed state. The rubber ring on its outer edge is kept stationary with the toothed wheel, and the two metal rings are rubbed against the rubber ring by sandblasting on the back and kept stationary, such as figure ...

AI Technical Summary

Problems solved by technology

[0002] Due to the continuous development of petroleum resources, the number of conventional recoverable resources is getting less and less, and the oil has gradually been exploited in deeper layers. The difficulty of mining is increasing, and the requirements for the use of drilling machinery are getting higher and higher. In the past, the use of conventional drilling machinery seals Can no longer meet the needs of oil drilling

At present, the sealing structure of the roller cone bit in the prior art is that two metal rings (the palm ring and the wheel ring) rub against each other to maintain a sealed state. The rubber ring on its outer edge is kept stationary with the toothed wheel, and the two metal rings are rubbed against the rubber ring by sandblasting on the back and kept stationary, such as figure 1 and figure 2 As shown, the cross section of the wheel ring and the palm ring is arc-shaped. This arc is to increase the contact area with the rubber ring. When working, the rubber ring is placed in the annular groove formed by this arc. Due to the two metal The ring and the rubber ring are a split structure, and the rubber ring remains stationary by extrusion. If the extrusion force is small, there will be slippage between the two metal rings and the rubber, which is not conducive to sealing. If the two metal rings and the rubber If the extrusion force of the ring is too large, it will cause premature damage to the metal ring and rubber, resulting in seal failure

Once the seal fails, high-pressure liquids such as corrosive and abrasive intrusion into the sealing system inside the drill bit from the outside of the drill bit will cause premature wear of the bearing system of the drill bit and the drill bit will be scrapped

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