O'Reilly logo

Applied Subsurface Geological Mapping by Daniel J.Tearpock, Richard E. Bischke

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 3. Directionally Drilled Wells and Directional Surveys

Introduction

A directionally drilled or deviated well is defined as a well drilled at an angle less than 90 deg to the horizontal (Fig. 3-1). Wells are normally deviated intentionally in response to a predetermined plan; however, straight holes often deviate from the vertical due to bit rotation and natural deviation tendencies related to rock types and structure.

Diagrammatic cross section illustrations of (a) a simple ramp or “L” shape well, (b) a more complicated “S” shape well, and (c) a horizontal well.

([a] and [b] published by permission of Tenneco Oil Company, [c] published by permission of J. Brewton.)

Figure 3-1. Diagrammatic cross section illustrations of (a) a simple ramp or “L” shape well, (b) a more complicated “S” shape ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required