Challenges and experiences in the applied drilling fluid technology of ultra HTHP wells

• Autorzy: Dorman J. , Gyory L.
• Konferencja: Międzynarodowa konferencja naukowo-techniczna Geopetrol 2006 nt. Problemy techniczne i technologiczne pozyskiwania węglowodorów a zrównoważony rozwój gospodarki : Zakopane, 18-21.09.2006
• Języki publikacji: EN

Abstrakty

EN

Drilling and completion of ultra HTHP wells are always great challenge both for the Operator and the Service Company. Applied drilling fluid technology is one of the most important elements of drilling and completion operation in such challenging environment. Essential requirements are rigorous planning methods and field practice at advanced level, using field proven and novel, environmentally friendly additives, efficient formation damage control techniques, enforcement of environmental issues, using efficient mechanical solids control, integrated and engineered fluid management. Earlier HTHP drilling fluid technology has been successfully used in recent deep drilling campaign (at formation temperatures up to 190-200 degrees of Celsius), however further optimization was needed for the higher temperatures being encountered in recent deep and hot wells. It was clearly considered that there is a technology gap between HTHP and ultra HTHP wells (when formation temperature exceeds 205-210 degrees of Celsius). Extensive laboratory studies and recent advancements in water-based drilling fluid technology have resulted in a new approach to understanding drilling fluid chemistry and behavior under ultra HTHP conditions. Following a series of HTHP wells an ultra HTHP well was successfully drilled to TD, encountering 220-225 degrees of Celsius formation temperature, 1 800 kg/m3 mud weight equivalent pore pressure, coupled with CO2 containing gas influx (diffusion). Logs were run to bottom without incident, as well as run in and cementing of the 41/2" liner. The paper describes the advanced approach to drilling fluid engineering for ultra HTHP wellbore conditions. Results from other HTHP wells will also be presented and discussed. The laboratory results and field data have proven the ability of properly formulated water-based drilling fluids to achieve drilling objectives (and other issues) in challenging ultra HTHP environments.

Słowa kluczowe

EN

drilling; ultra HTHP wells

PL

wiertnictwo

• Wydawca: Instytut Nafty i Gazu - Państwowy Instytut Badawczy
• Czasopismo: Prace Instytutu Nafty i Gazu
• Rocznik: 2006
• Tom: nr 137
• Strony: 629--629

Twórcy

autor

Dorman J.

autor

Gyory L.

• MOL Hungarian Oil and Gas Plc.