"Bulletin of the Association of Drilling Contractors" №4, 2020

EXPERIENCE OF COMPLETION OFFSHORE WELLS IN THE AZERBAIJANI SECTOR OF THE CASPIAN SEA

Mamedbekov O.K. – Doctor of Technical Sciences, Professor, Technical Director of Frontier International LLC,

Bessel V.V. – Candidate of Technical Sciences, Associate Professor, Executive Vice President of NewTech Services LLC,

Key words: offshore well, hydraulic dual-cone liner hanger, auto-fill float shoe, auto-fill float collar, maximum allowable liner run-in-hole speed.

The technical, technological and geological conditions for well drilling in the offshore fields of the Azerbaijani sector of the Caspian Sea have a number of features, such as high reservoir pressures, the presence of loss formations, large liner installation depths and small clearances between the liner and the borehole wall. Specialists of NewTech Services LLC, participating in well casing operations with liners, apply an individual, adaptive approach to the conditions of each offshore well, which allows achieving conditions acceptable for the Customer. The experience of well casing in the fields with complicated mining and geological conditions “Umid” and “Bulla Deniz” is presented, where, in order to avoid possible jamming of the liner in the casing during running, the standard outer diameter of the liner hanger assembly was reduced without changing the strength characteristics. The applied liner casing technology in conditions of small clearances and possible troubles during the running process ensured a surging and swabbing effect decrease, string auto-filling during running, the pressure equalizing between the tubular and annular spaces, the possibility of reverse circulation in the event of well flow, well casing performing in loss formation intervals, and, ultimately, an increase of the liner run speed.

The year 2021 number 1nd issue of the quarterly journal, "Bulletin of the Association of Drilling Contractors", is now available "Bulletin of the Association of Drilling Contractors"

ISSN 2073-9877

The scientific and technical journal, “Bulletin of the Association of Drilling Contractors”, is listed by the Higher Attestation Commission of the RF Ministry of Education and Science as one of the leading refereed journals and publications that feature main scientific results of doctoral and candidate’s dissertations.

Jack-up "Arkticheskaya"

Jack-up "GSP Uranus"

SSDR "Ocean Endeavor"

SSDR "NAN HAI JIO HAO"

Jack-up "GSP JUPITER"

SSDR "RAKURYU-5"

SSDR «SCARABEO 9»

ООО «Шатскморнефтегаз», Saipem Drilling

DS "Deep Venture"

SSDR «WEST ALPHA»
EXXON MOBIL RUSSIA INC.