Kuwait Oil Company Drills Through Challenging Shale Sections in Record 11 Days | Schlumberger
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Location
Kuwait, Asia
Details

Northern Kuwait

Lithology
Shale

Formations
Ahmadi and Wara

Sections
121/4 in and 81/2 in

Dogleg severity
11°/100 ft

Background
Due to wellbore stability issues, lubricity requirements, and depleted zones, Kuwait Oil Company historically used nonaqueous fluid to drill the buildup section in challenging shale formations. However, to meet new environmental regulations, the operator needed an alternative drilling fluid that would satisfy both operational and environmental objectives. M-I SWACO deployed a high-performance, water-base mud (HPWBM) incorporating KLA-STOP* liquid polyamine shale additives and POROSEAL* copolymeric filtration- control sealing additives. The additives enabled Kuwait Oil Company to drill the target sections in a record 11 days.
Products Used
G-SEAL PLUS and G-SEAL PLUS COARSE Wellbore Stabilizing Agent
KLA-STOP Shale Additive
POROSEAL Sealing Additive

Kuwait Oil Company Drills Through Challenging Shale Sections in Record 11 Days

Water-base mud with KLA-STOP and POROSEAL additives delivers high drilling performance while meeting environmental regulations

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The customized drilling fluid included a clay hydration suppressant, shale-sealing additive, and a customized bridging package. Kuwait Oil Company drilled and cased the 121/4-in and 81/2-in sections nearly 7 days faster than the offset wells average with no wellbore stability or differential sticking issues.
Products Used
G-SEAL PLUS and G-SEAL PLUS COARSE
Wellbore stabilizing agents

Graphite and industrial carbon blends that bridge and seal porous and fractured formations.
KLA-STOP
Liquid polyamine shale additive

Effectively inhibit shale or gumbo clays from hydrating and minimize the potential for bit balling.
POROSEAL
Copolymeric filtration-control sealing additive

Improves the performance of highly inhibitive water-based drilling fluids.

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