Drill bit equipment for deep water drilling and drilling method

Abstract

The invention relates to the field of marine drilling, and discloses drill bit equipment for deep water drilling and a drilling method. The drill bit equipment for deep water drilling comprises a drilling part, a drill body part and a spraying channel, wherein the drilling part comprises a drill bit body and a plurality of blades spirally distributed on the drill bit body; the drill body part is connected with the drilling part; the spraying channel comprises a drilling fluid flow channel, a first spraying hole and a second spraying hole; the drilling fluid flow channel penetrates through the drill body part and extends into the drilling part; the first spraying hole is formed in the drilling part and communicates with the drilling fluid flow channel; and the second spraying hole is formed in the drill body part and communicates with the drilling fluid flow channel. The drilling speed of surface layer drilling machinery is increased, the deep water surface layer operation efficiency is improved, the risk that a roller bit is damaged and fails is avoided, limitation of the service life of a roller bit bearing is overcome, and the second-opening drilling depth can be increased on the premise of meeting operation safety. In addition, the track of a second-opening borehole can be controlled well, the annulus volume is reduced, the amount of well cementation cement is reduced, and the operation cost is reduced.

Description

technical field [0001] The invention relates to the field of ocean drilling, in particular to a drill bit device and a drilling method for deep water drilling. Background technique [0002] The surface conduit running technology for deepwater drilling is a key link in the construction of deepwater drilling projects and a core technology that challenges the difficulty of deepwater operations. The surface conduit is the first layer of structural conduit installed during the construction of deepwater oil and gas wells. It provides structural support for the subsea wellhead, casing suspension, subsea blowout preventer system and subsea production system. The surface conduit construction of deepwater drilling has the characteristics of high operational risk and difficult control. If the installation method is not selected correctly and the control measures are taken improperly, it will easily lead to serious serious problems such as incomplete running of the conduit, excessive we...

AI Technical Summary

Problems solved by technology

The surface conduit construction of deepwater drilling has the characteristics of high operational risk and difficult control. If the installation method is not selected correctly and the control measures are taken improperly, it will easily lead to serious serious problems such as incomplete running of the conduit, excessive wellhead deflection angle, wellhead subsidence and even well scrapping. result in significant economic losses

[0003] The jetting method is often used to run the surface conduit in deepwater drilling. This method can complete the jetting running of the conduit and the drilling of the second wellbore in one trip, and the conduit does not need cementing, which can save operating time and operating costs. The roller bit has the following disadvantages: as the well depth increases, the degree of rock compaction becomes better, the compressive strength gradually increases, the ROP of the roller cone bit decreases significantly, and there is a risk of damage to the roller cone bit when the drilling pressure is increased, and the bearing of the roller cone bit has Service life is limited; when the borehole trajectory deviates from the design during the actual drilling process, the directional well tool for small boreholes does not have an obvious effect when performing deflection correction operations relative to large boreholes, and for the motor, deflection correction The operation requires sliding drilling, and the ROP of the drill bit will also be significantly reduced, resulting in the dual consequences of reduced timeliness and well trajectory deviation

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