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Commonly used basic drilling tool string — Full-hole drilling tool string
release time：2026-06-17
source： Internet
The full-hole drill string assembly, also known as the rigid match drill string or rigid full-hole drill string, is a drill string configuration installed at the lower part of the drill string. It features high stiffness and a small gap between the wellbore diameter and the outer diameter of the drill string, designed to prevent excessive inclination angles and wellbore curvature. Typically, the rigid full-hole drill string consists of several stabilizers with diameters close to the bit size and a section of drill collar with a larger outer diameter.
The anti-deviation principle involves installing a certain number of stabilizers on the lower section of the drill string above the bit to straighten the drill collar. This enhances the stiffness of the lower drill string, reducing its bending degree to eliminate severe bit deviation. It minimizes and restricts the inclination force caused by drill string bending while the stabilizers can support against the wellbore wall, counteracting the natural formation deviation force. This achieves the goal of maintaining the well deviation within the smallest possible range.
To utilize the deviation control effect of the full drill string, there must be at least three stabilization points on the drill string. In addition to a stabilizer near the bit, two more stabilizers should be installed above it to maintain three-point contact with the wellbore wall. If only two points of contact exist, the drill string can follow a curved path and fail to ensure wellbore straightness. With three points of contact, both wellbore straightness and lateral movement of the bit can be guaranteed.
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