"REPORTER of the Association of Drilling Contractors" N 1, 2013

IMPROVING DESIGN OF DEEP OFFSHORE EXPLORATION WELLS.

Oganov, Garry S. – Dr.Tech.Sci., professor, general director, OP Offshore Well Design Centre of LLC Krasnoyarsk Gazprom Neftegazproekt, g.oganov@krskgazprom-ngp.ru
Chaikovsky, Gennady P. – Cand.Tech.Sci., general director, OJSC NPO Burovaya Tekhnika, reception-bt@integra.ru
Gusman, Alexander M. – Dr.Tech.Sci., professor, head of department, OJSC NPO Burovaya Tekhnika, alevina@integra.ru
Ivanychev, Roman V. – Reserve director of the Association of enterprises «Center of projection of construction offshore wells» LLC «Krasnoyarsk Gazprom Neftegazproekt» g.oganov@krskgazprom-ngp.ru


Key words: casing string, abnormal formation pressure, well design,  complicated geological conditions.
The paper’s focus is well design problems relating to the existing geological environment and technical limitations with regard to the number of casing strings required to isolate anomalous zones. There are examples of well designs which make allowance for the complex geological conditions including anomalous pressures and  temperatures increasing with depth. The paper offers a progressive approach to offshore well designing, including a method of setting a casing string on a previous string, which allows to reduce specific amount of steel and the cost of safe well drilling.





 

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