Western Geophysical, the seismic surveying arm of Houston-based oilfield services firm Baker Hughes, adopted the Intelisys system in June.

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Halliburton ( HAL - news - people ) (HAL, 29) and Baker Hughes (BHI, 47) , respectively the sector's second- and third-largest firms.

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He was being sued for deceptive practices by Houston Monarch, a small oilfield services outfit that had tried to buy Baker Hughes (nyse: BHI - news - people )' McMurry Oil Tools unit and use First Reserve as a lender.

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Duroc-Danner, 52, chief executive of Weatherford, the fourth-largest oil service company (after Halliburton, Baker Hughes and Schlumberger), with 25, 000 workers worldwide.

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Its customer base comprises four of North America's largest providers of pressure-pumping services to the drilling industry: Baker Hughes Inc.

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Baker Hughes ( BHI) and Schlumberger ( SLB) traded to new 52-week highs last Monday and Chevron ( CVX) and Exxon Mobil ( XOM) ended the week at year to date highs.

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