Oil and gas company Caspian Sunrise has provided the following update at its BNG Contract Area in Kazakhstan.
Deep Wells - new wells
Caspian Sunrise is pleased to announce the spudding of a new deep well A8 within the Airshagyl field of the BNG contract area. It has reached a depth of 350 meters without incident.
The well is planned with a total depth of 5300 m and will target pre-salt reservoirs of Permian, Carboniferous, and Devonian ages. Based on our interpretation of the 3D seismic data we expect to encounter the top of the salt layer at a depth of about 3900 m.
The well is being drilled in two parts. The first 4100 m; to the expected base of the salt layer, will be drilled by Sinopec.
To ensure lessons learned from the drilling of the previous three deep wells are utilised and the likelihood of a successful well maximised, BNG staff will provide direct oversight and work in close collaboration with the drillers when drilling from the base of the salt through the reservoir section.
A casing shoe will be set and drilling of the prospective reservoir sections will be done using the BNG operator and crew which successfully drilled the A5 side-track 2 with minimal formation damage.
The well is anticipated to take approximately 250 days to drill and complete.
Deep Wells - exiting wells
As previously announced our policy at Deep Well 801 is to wait until the pressure in the well reaches its natural peak before opening the well and commencing a flow test. The pressure in the well continues to rise steadily and by 27 November 2018 had reached 485 bar.
Again as previously announced the issue at A5 has been the presence of approximately one meter of unwanted metal towards the bottom of the well. To date attempts to remove the metal have proved unsuccessful. Further specialist tools are being sourced to assist in the removal of this unwanted metal. Should the unwanted metal still remain present in the well after all attempts to remove it have been exhausted our fall back would be to drill a further side track from a position above the unwanted metal obstruction.
Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/29112018/caspian-sunrise-provides-update-on-its-deep-wells-at-its-bng-contract-area-in-kazakhstan/