This top of target would almost certainly preclude the use of Build and Hold wells and require use of "S" shaped wellbores. In some cases this depth may not be available within several hundred meters and could be specified as the wellbore intercept of a given formation top. When targets are defined the directional driller must also know the true vertical depth at which the target applies. Targets may be defined as an angle limitation at depth - e. a fault, a formation change ( salt dome), legal boundary etc. Any target can be reached - given enough time, money and effort but the economics of drilling dictate the use of as large a target as possible.Įach of the various targets is discussed below:Ī horizontal circle of given radius about a fixed subsurface point.Ī circular, square or rectangular shape with at least one side fixed by a physical constraint e.g. Some care should be taken with target definition. If multiple zones are to be penetrated, the multiple targets should be selected so that the planned pattern is reasonable and can be achieved without excessive drilling problems. a circle with a specified radius centred about a specified subsurface point. They will often define the target in terms of a physical limitation - i.e. Usually this will be a geologist, a reservoir engineer or a production engineer. In the majority of cases it will be defined by someone other than the directional driller. The target, or objective, is the theoretical, subsurface point or points at which the wellbore is aimed. The following are some of the more important and commonly used terms. A short glossary of the more frequently used terms for Directional Drilling is included here and is intended only as an aid in understanding directional drilling terminology and is neither a definitive work in the field nor by any means complete.
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