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The spiral drill collars produced by SANJACK PETRO are made of AISI 4145H modified alloy steel. Three right-handed spiral grooves are machined on the outer circle of ordinary drill collars. The main function is to reduce the contact area and friction of the drill collar on the well wall during work, to keep the mud moving evenly with the spiral groove, to maintain the balance of the drill string, and to prevent the pressure difference from sticking. The weight of a single screw drill collar is about 4% lighter than the ordinary drill collar of the same specification, and the shape of the two ends is the same as that of the thread and the ordinary drill collar. According to the spiral form, it is divided into type I and type II.
Spiral drill collars can reduce the contact area with the borehole wall, which can effectively reduce the possibility of differential pressure block. The reason why spiral drill collars are widely used is because of their own characteristics. This special spiral drill collar can reduce the contact area between the well wall and the pipe body, thereby avoiding the jamming of a drilling tool. The weight of the spiral drill collar is 4~6% less than the weight of the round drill collar. It is an effective anti-deflection drilling tool. It can also correct the tilt by using higher drilling pressure in the inclined area.
Spiral drill collar is a mechanistic term. The spiral drill collar can prevent the differential pressure of the drilling tool from being blocked during the drilling process, and the spiral groove can allow the mud to flow freely around the drill collar to balance the pressure and prevent the formation of blockage, thereby effectively preventing the occurrence of differential pressure sticking.
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