slb is a global technology company, driving energy innovation for a balanced planet

halliburton is one of the world's largest providers of products and services for the ever-evolving needs of the energy industry.

baker hughes | we take energy forward - making it safer, cleaner, and more efficient for people and the planet.

chevron works to meet the world's growing demand for energy by exploring for oil and natural gas; refining and marketing gasoline; producing chemicals and more.

canadian natural is one of the largest independent crude oil and natural gas producers in the world. the company continually targets cost effective alternatives to develop our portfolio of projects and to deliver our defined growth plan, thereby creating

nov provides oilfield equipment, technologies, and expertise that answer the challenges of oil and gas customers worldwide with safety, efficiency, and reliability.

fluor, a leading engineering and construction company, provides engineering, procurement, construction (epc), maintenance and project management services worldwide.

learn about drilling formulas and drilling calculations frequently used in drilling and workover operation.