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| Drilling Rig - Well construction process |
The installation sequence for the components shown on the following drawing is summarized below. This is not intended as a complete procedure, but an explanation of the diagram only
- The cellar is prepared (onshore).
- The conductor string is installed by a surface rig or pile driving in preparation for the drilling rig commencing operations.
- The well isspudded and the wellbore drilled to surface casing depth.
- The surface casing string is run and cemented into place.
- A casing head housing (CHH) is attached to the surface casing.
- Drilling continues to the intermediate casing depth.
- The intermediate casing string is run and the casing hanger is landed in the CHH.
- The intermediate casing string is cemented.
- The casing head spool (CHS) is installed onto the CHH.
- Drilling continues to the production casing depth.
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- The production casing string is run and the casing hanger landed into the CHS.
- The production casing string is cemented.
- The tubing head spool (THS) is made up onto the CHS.
- The well may be perforated by electric line casing guns, if required at this point (optional).
- Tubing and completion components are run and spaced out.
- The tubing hanger is attached to the tubing and landed in the THS.
- At this point the packers may be set.
- A back-pressure valve (BPV) is installed in the tubing hanger.
- The drilling BOP stack is removed and the Christmas tree is nippled up.