Adaptive Torque Balance Differential Pressure Drill

Abstract

The invention relates to an adaptive torque-balance differential pressure drill bit which comprises a reaming drill bit, a conversion connector, a pilot drilling bit and a torque transmission device, wherein the conversion connector, the pilot drilling bit and the torque transmission device are integrally connected. The reaming drill bit is positioned between the conversion connector and the pilot drilling bit and mounted on the outer side of the torque transmission device, the torque transmission device comprises a first transmission part, a transmission part, a second transmission part and a limit part, the first transmission part, the transmission part and the second transmission part are sequentially connected, the first transmission part is connected with the conversion connector, the second transmission part is connected with the pilot drilling bit, at least one stop part is arranged on the transmission device, the limit part is connected with the stop parts and arranged on a crown of the reaming drill bit, and a first elastic part matched with the stop parts is arranged between the stop part and the crown of the reaming drill bit and used for transferring part of rock breaking torque and buffering torque fluctuation of the reaming drill bit. According to the drill bit, torque fluctuation of the drill bit can be adaptively controlled in the drilling process, torsion impact vibration caused by sticking slip is relieved and even avoided in the drilling process, combination between the drill bit and a bottom drill tool is protected, and drilling is accelerated.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering and relates to drilling tools, in particular to an adaptive torque balance differential pressure drill bit. Background technique [0002] Drilling field practice shows that by changing the structure of the bottom hole during drilling, the formation stress at the bottom hole can be released in advance and the rock breaking efficiency of the drill bit can be effectively improved. Based on the above principles, foreign NOV companies have developed concentric two-stage Speed ​​DrillBits, and domestic Shengli Drilling Institute Peng Ye and others have developed two-stage PDC drill bits. [0003] The Chinese invention patent application with the publication number CN105443041A discloses a differential pressure drill bit, which specifically discloses the following features: the differential pressure drill bit includes a conversion joint, a liquid transmission force transmission short, a rea...

AI Technical Summary

Problems solved by technology

Since the PDC bit (English: Polycrystalline Diamond Compact bit) has a strong selectivity to formations, when drilling hard formations or multi-interlayer formations, the stick-slip phenomenon and the resulting impact damage will lead to lower ROP, The footage of a single drill bit is reduced and the well construction period is greatly extended

Although the above-mentioned existing drill bit can be equipped with a penetration control unit, since the penetration depth cannot be actively controlled when drilling into complex formations, there is still the potential for stick-slip phenomenon, resulting in strong torque fluctuations of the drill bit during drilling , causing fatigue damage to the drill bit or bottom hole assembly, and failing to optimize the drilling efficiency of such bits

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