One of the largest oilfield services companies in the world, halliburton serves the upstream oil and gas industry in 80 countries with a complete range of services, from the location of hydrocarbons to the production of oil and gas. it operates in two segments: drilling and evaluation and completion and production. services include providing production optimization, drilling evaluation, fluid services, and oilfield drilling software and consulting. it combines tried-and-true well drilling and optimization techniques with high-tech analysis and modeling software and services. halliburton works in established oilfields from the north sea to the middle east as well as in newer sites in southeast asia and africa.