Dual Seal Roller Cone Bits with Seal Pressure Adjustment

Abstract

The invention relates to the technical field of drilling tools, in particular to a dual-seal cone bit with a sealing pressure adjusting device. The sealing pressure adjusting device is arranged on a back conical surface portion of a cone, and comprises a pressure transmission hole, a small oil storage hole, a small oil storage bag and a small oil storage hole plug, the small oil storage hole is formed in the back conical surface portion of the cone, the pressure transmission hole is formed in a supporting baffle, a bearing seal cavity is communicated with the small oil storage hole through the pressure transmission hole, the small oil storage bag is fixedly arranged in the small oil storage hole, one end of the small oil storage bag is open, the other faces of the small oil storage bag are closed, the open portion of the small oil storage bag faces the bearing seal cavity, the small oil storage bag is fixedly arranged in the small oil storage hole through the small oil storage hole plug, and a pressure transmission through hole is formed in the middle of the small oil storage hole plug. The dual-seal cone bit with the sealing pressure adjusting device can effectively balance the pressure between the two sides of a sand baffle ring, the sand baffle ring can work under the condition of the small pressure difference, and the service life of the sand blocking ring is prolonged.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to a double-sealed roller cone bit with a sealing pressure regulating device. Background technique [0002] The roller cone bit is a tool for breaking rocks in the earth's crust, and is widely used in oil, natural gas drilling and other mining drilling and other fields. With the further development of petroleum resources, the number of oil wells that can be exploited by conventional drilling is decreasing, and the difficulty of extraction is becoming more and more difficult. More and more oil wells are developed by unconventional drilling. The proportion of special craft wells such as horizontal wells and branch wells in oil production is increasing, so that there are more opportunities to use downhole power drilling tools for a longer time. It is more and more widely used, and its characteristic is that the drill bit speed has been greatly improved, which has exceeded 2-3 t...

AI Technical Summary

Problems solved by technology

This structure is also suitable for the bearing lubrication of the double-sealed roller cone bit and the adjustment of the internal and external pressure difference of the main seal ring, but it is not suitable for the adjustment of the internal and external pressure difference of the double-seal sand retaining ring, because the main seal ring has a large impact on the sand retaining ring. The pressure balance and oil storage compensation device designed on the ring 4 and the tooth palm acts as a barrier, and cannot adjust the internal and external pressure difference of the sand retaining ring 4. If a hole is opened in the sand retaining ring to connect to the pressure balance and oil storage on the tooth palm The compensation device is also infeasible, because if the sand retaining ring 4 fails, the mud debris will enter the bearing chamber through the pressure balance and oil storage compensation device on the tooth palm, resulting in premature damage to the bearing and the main sealing ring

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