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The function and shape classification of drill collars

release time：2023-12-06

source： network

Drill collars are used to increase the weight of the drill string and provide greater drilling pressure to the drill bit, accelerating the drilling speed. Due to its strong rigidity and good stability, it also plays a role in stabilizing the drill bit and maintaining the wellbore trajectory. Spiral drill collars and non-magnetic drill collars belong to special types of drill collars, among which spiral drill collars are machined with three spiral grooves on the cylindrical surface of the overall drill collar to reduce the contact area of the wellbore wall. Spiral drill collars can effectively prevent pressure difference and drill pipe sticking. Non magnetic drill collars are mainly used for monitoring during oil drilling processes.

According to the shape and material of the drill collar, it can be divided into three forms:

Type A (cylindrical): A drill collar made of ordinary alloy steel, with a circular cross-section both inside and outside the pipe body.

Type B (spiral): a drill collar made of ordinary alloy steel with spiral grooves on the outer surface of the pipe.

Type C (non-magnetic): Made of stainless alloy steel with low magnetic permeability, the pipe body has circular drill collars both inside and outside the cross-section.

The function of spiral drill collars

Main features of drill pipe

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The function of spiral drill collars

Main features of drill pipe

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