«Onshore and offshore oil and gas well construction»

Sticking of the drilling rig bottom assembly during drilling lowering-uplifting operations

UDC: 622.248.54
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: horizontal well, drill string bottom assembly (DSBA), support-centering element, local wellbore curvature, jamming of the supporting-centering element, sticking of the drill string, jamming of the drill string bottom assembly

Annotation:

The author of the article considers the mechanism of drill string mobility loss during lowering-uplifting operations. It has been revealed that deformation of the drill string bottom assembly (DSBA), when moving in a curved wellbore due to a change in the ratio of longitudinal, transverse, distributed and concentrated loads in confined well conditions is of decisive importance for the angular movement of the supporting-centering element (SCE), which should reproduce the skew of the elastic axis of the drill string bottom assembly (DSBA) at the place of its installation. If the SCE rotation is impossible, it may be jammed in the wellbore, causing the drill string sticking. In wellbore intervals with various deviations from the ideal shape, there occur jamming conditions, in which the SCE occupies a position determined by the geometry of the wellbore defect itself, thus significantly increasing the bending moment of the drill string bottom assembly (DSBA) section located above and complicating the conditions for eliminating the jam. Technical solutions are proposed that allow minimizing the bending moment impact on the SCE position from the overlying drill string bottom assembly (DSBA) section, which will eliminate the conditions for its jamming in the wellbore.

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