By Tom Inglis
A few 35 years in the past i used to be just a little precariously balanced in a drilling derrick aligning a whipstock right into a directional gap in North Holland via the Stokenbury strategy, and doubtless considering to myself that i used to be on the very leading edge of know-how. through the intervening interval it has develop into noticeable to many people that one of the most major technical advances within the oil enterprise were made in drilling, and especially within the fields of offshore and directional drilling. It has additionally develop into obvious that the standard of the technical literature describing those advances has no longer stored velocity with that of the advances themselves usually. a selected evident instance of this has been within the box of directional drilling the place a wide literature hole has existed for a few years. i'm thrilled to work out this hole now choked with the current quantity by way of my pal Tom Inglis. certainly it is just after studying his complete ebook that I fully grasp the level of my very own lack of knowledge of the most recent thoughts of directional drilling and the way fascinating it was once to have an authoritative textual content at the topic. i believe yes that this quantity might be welcomed through the and warmly suggest it to all who're in any respect concerned and attracted to the interesting global of drilling.
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Additional info for Directional Drilling (Petroleum Engineering and Development Studies) (v. 2)
To correct the path of the well bore the angle must drop from 18° to 15° and the direction must turn to the left from its present heading of N 70° E. This must be accomplished over the next 400 ft, and the dog-leg severity is limited to 2° per 100 ft. Calculate the required toolface setting, allowing 30° reactive torque due to the motor. Calculate the new direction at the end of the correction run. Check your results by drawing a Ragland diagram. 8. At an inclination of 8°, the well must be turned to the right by setting a whipstock.
To adapt a standard drilling rig for slant hole drilling, certain modifications must be made: (a) The rotary table must be inclined so that it is perpendicular to the axis of the derrick. ) Fig. 19. Fixed platform using slant rig. DIRECTIONAL DRilLING 38 (b) The travelling block and hook must be run on guide rails up inside the derrick. (c) The BOP stack must be mounted on a frame that can be tilted to the required angle. (d) A hydraulic pipe racking system makes the handling of drill pipe much easier.
5°. The bent housing introduces the deflection much closer to the bit than is possible with a bent sub on top of the motor. This means that a bent housing will provide a larger turn than a bent sub of similar size. drill collars Fig. 13. Deflection assembly. 31 DEFLECTION TOOLS AND TECHNIQUES The advantages of using a lJent sub or bent housing with a mud motor are that: ' (a) Full-gauge hole can be drilled without the need for a pilot hole. (b) The continuous side force produced at the bit by the bent sub gives a smooth curvature with less risk of severe dog-legs.