Analysis of complications and proposal of measures to prevent adverse events during drilling activities

operators are faced with extra work in preparing the borehole for the
landing. For example, during the trip, it is difficult to move drilling
tools along the borehole. As a rule, the technology selection measures
carried out at drilling enterprises enable the landing of a casing
column in a single run or reduce the time required for preparing the
borehole, as well as decrease the construction time of wells during
the casing landing. Nevertheless, the reduction of extra work in the
process of preparing the borehole for the landing is an urgent
problem.
The completion of wells includes their fastening, landing, and casing
cementing jobs. However, not in all cases does landing the casing
strings go without complications. The main complication during the
landing of the casing strings is their inability to extend along the
borehole, resulting in their non-admission.
The primary reasons for the occurrence of slacking off, tight pulls,
and seizures are the abundance of clay minerals, the discrepancy
between the properties and composition of the drilling and washing
fluid, and the flushing mode dictated by the geological and technical
conditions of the formation. Seizures are the most common and
serious complications during drilling operations.