Technology Of Drilling Of Slant Well On The Field Of Western Siberia

Western Siberia has been studied. Development of well construction
has taken into account the next geological features of the section:
permafrost rocks occur to the depth of 260 m, and iciness also takes
place. Well construction is selected on the base of intervals of
incompatible drilling conditions. The designed profile includes
several intervals: one vertical interval, one zenith angle buildup
section, two hold sections and one zenith angle drop section. A
check calculation of the setting depth of the intermediate casing for
the condition of preventing hydraulic fracturing of rocks near the
shoe was carried out, and the safety factor of rocks for hydraulic
fracturing was found. Drill pipes calculation includes determination
of their length and diameter as well as allowable setting depth for
drill pipes. This article demonstrates drilling methods, borehole
under-reaming methods and the main parameters for the
performance of technological operations of directional drilling. A
drilling rig has been selected according to the allowable hook load.
The density of the used drilling muds has been substantiated for the
intervals of compatible drilling conditions, types and parameters of
muds.