Novel tricone bit

Abstract

The invention relates to a novel tricone bit which comprises three palms and cones arranged at the lower ends of the palms. The three palms form a drill bit body through welding. The novel tricone bit is characterized in that at least one palm which is movable in the axial direction exists, and each palm is composed of fixed jaws and a movable bearing. After the scheme is adopted, bit pressure among the three cones can be distributed again according to formation conditions; axial vibration of the bit is reduced, and the stability of the bit is improved; due to the fact that the cones move in the axial direction, impacting rock breaking can be generated, the rock breaking efficiency of the bit is improved, the complex cones are decomposed into the fixed jaws and the movable bearings, and the novel tricone bit is convenient to manufacture and low in cost.

Description

technical field [0001] The invention belongs to the technical fields of drilling such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and in particular relates to a three-cone drill bit. Background technique [0002] The tri-cone bit is a tool for breaking rocks during drilling, and is widely used in oil, natural gas drilling and other mining drilling. 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. Due to the high drilling pressure exerted by the tri-cone bit, it is easy to cause axial and lateral vibration of the bit, resulting in the collapse of the cone teeth. Tee...

AI Technical Summary

Problems solved by technology

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. Due to the high drilling pressure exerted by the tri-cone bit, it is easy to cause axial and lateral vibration of the bit, resulting in the collapse of the cone teeth. Teeth, broken teeth, lost teeth and other phenomena will cause the drill bit to fail in advance and increase the drilling cost

The current tricone bit structure must manufacture the palm blank as a whole, which is costly and long-term, and the shape of the palm blank is very complicated. It is not only expensive to establish a production line, but also cannot guarantee the manufacturing accuracy of product components.

As a result, the unit price of the tri-cone bit is high, and because of the complicated manufacturing process and high cost, the user of the tri-cone bit can only manufacture a large number of manufacturers each time, forcing the user to accumulate a large amount of working capital

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