Gyro surveys will be taken when the casing has been run if it was not possible to perform an MMS in the open hole. There are two distinct groups of slim, surface reading, gyro surveying tools: those that require orientation to a foresight reference bearing on the surface (‘surface referenced’) and, those that seek True … Introduction to Gyro Surveys

This article describes an example of a directional drilling plan. The hole will be kicked-off  below the 26″ conductor shoe. The hole will be directionally drilled to the 18 5/8″ casing setting depth with the 17 1/2″ assembly. Thereafter the hole will be opened up with a 22″ hole opener assembly or under reamed to … Directional drilling plan with hole opener and under-reamer

This article describes an example of a directional drilling plan. The hole will be kicked-off  below the 26″ conductor shoe. The hole will be directionally drilled to the 18 5/8″ casing setting depth with the 12 1/4″ assembly. Thereafter the hole will be opened up with a 22″ hole opener assembly or under reamed to … Directional drilling plan with 12.25″ pilot hole, 22″ hole hole opener and 24″ underreamer