04 November 2005
New PeriScope 15 Proactive Well Placement Technology Used to Increase Net Present Value of Field in Trinidad

HOUSTON, November 4, 2005 - Petrotrin and Schlumberger announced today the successful deployment of PeriScope* 15 well placement technology for Petrotrin in the North Soldado field off the southwest coast of Trinidad.

Petrotrin, the national oil company of Trinidad and Tobago, deployed PeriScope 15 as part of a production enhancement campaign. PeriScope 15 was used to address a geological well placement challenge in the North Soldado Field. PeriScope 15 navigated a thin bed of oil-bearing sand in well S854, despite the complex subsurface environment. More than 1325 feet of oil-bearing sand between six and 10 feet thick was penetrated.

"We anticipated penetrating around 400 feet of pay sand, so the results far exceeded our expectations," said Kain Look Yee, operations general manager, Petrotrin. "Previous results from other horizontal wells were below expectations because of difficulties in maintaining the well path. With PeriScope 15 we could better navigate severe dipping and faulting to more economically drain the reservoir."

In addition to Trinidad, PeriScope 15 technology has been deployed on multiple jobs around the world including in Southeast Asia, the Middle East, South America and the North Sea.

"PeriScope 15 technology alters the economics of pursuing small or challenging reservoir targets," said Hatem Soliman, general manager, Venezuela, Trinidad and Caribbean, Schlumberger. "Wells that were once impossible to complete or uneconomic can now be profitable."

PeriScope 15 technology is a unique, proactive well placement tool for directional or horizontal drilling. It provides deep, directional electromagnetic measurements that generate a 360? image and detect resistivity boundaries such as cap rock and fluid contacts up to 15 feet from the wellbore. Its information regarding direction and distance enables steering decisions to be made such that an entire horizontal well can be drilled in the best reservoir zone the first time, with no exits, ultimately yielding a less costly and more productive well.

PeriScope 15 directional, deep reading service for production enhancement is the most recent addition to the Scope* family of while-drilling services, which includes EcoScope* multifunction logging-while-drilling; StethoScope* formation pressure-while-drilling; and TeleScope* high-speed telemetry-while-drilling services. The new-generation Scope while-drilling services dramatically improve drilling performance and well placement--leading to increased production, sooner. Scope services set new standards for reliability and data quality, while quadrupling the data transmission rate over the industry standard.

For additional information on the Scope family of while-drilling services, go to www.oilfield.slb.com/scope.

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About the Organizations
Petroleum Company of Trinidad and Tobago Limited, Petrotrin, integrated oil company incorporated January 1993, is fully owned by the Government of the Republic of Trinidad and Tobago. The company with the highest crude production in the country, approximately 60,000 bopd, is also an active player in the upstream natural gas sector. Petrotrin operates a moderate conversion refinery with throughput in excess of 165,000 bopd for sales into the local, regional and international markets. It is the business entity making the single largest contribution to the national GDP, with activities touching in one way or another, a full 10 percent of the population. Petrotrin's customers are served by a cadre of highly trained, highly motivated staff in a mature Trinidad and Tobago petroleum industry tradition dating back to 1857 when the world's second commercial oil well on record was drilled in Aripero in the south of the island of Trinidad.

Schlumberger is the world's leading oilfield services company supplying technology, project management and information solutions that optimize performance for customers working in the oil and gas industry. The company employs more than 58,000 people of over 140 nationalities working in more than 80 countries, and comprises two business segments. Schlumberger supplies a wide range of products and services from formation evaluation through directional drilling, well cementing and stimulation, well completions and productivity to consulting, software, information management and IT infrastructure services that support core industry operational processes. WesternGeco, jointly owned with Baker Hughes, is the world's largest seismic company and provides advanced acquisition and data processing services. In 2004, Schlumberger operating revenue was $11.48 billion. For more information, visit SLB.com.

For further information, contact:
Susan Ganz
Media Relations Manager
Schlumberger Oilfield Services
Tel: +281 285 8245
sganz1@slb.com

Mark Lyndersay
Media Officer
Petrotrin
mark.lyndersay@petrotrin.com

© Press Release 2006