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

Abstract

The technology of drilling slant exploitation well in the oilfield of 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.