(02-03-2017, 11:03 AM)Liloilady Wrote:Is there an indication as to where this ST/bypass vertical well is positioned in relationship to the first hole poked? Same well pad? How close is it to the first well? Thanks.
The drill rig and well pad are exactly in the same location as before. When you do this bypass (sidetrack), you plug off the old well at a spot uphole from the current depth where you had problems. The info provided earlier said they went back to ~1200m and cemented off the original well. a whipstock is ran to help guide the drill bit out thru a window they mill out of the existing steel casing. The new bore will be guided by downhole sensors that allows them to steer the bit to wherever they want it to go. I would guess based on previous informaton that the new well bore will basically parallel the old path (vertical well), but moved over maybe 50 -100 meters to provide some structural isolation from the original well bore.
sidetrack
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1. vb. [Drilling]
To drill a secondary wellbore away from an original wellbore. A sidetracking operation may be done intentionally or may occur accidentally. Intentional sidetracks might bypass an unusable section of the original wellbore or explore a geologic feature nearby. In the bypass case, the secondary wellbore is usually drilled substantially parallel to the original well, which may be inaccessible due to an irretrievable fish, junk in the hole, or a collapsed wellbore.
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2. n. [Drilling]
A secondary wellbore drilled away from the original hole. It is possible to have multiple sidetracks, each of which might be drilled for a different reason.
Here is an animation video from youtube showing a representation of a typical process:
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