18 © TechSci Research Research Methodology 18 Baseline Methodology Our dedicated team of industry experts has monitored and analyzed various aspects of the global directional drilling market . The team has analyzed the outlook of various segments of this market, while considering the major influencing factors such as i ncreasing demand for oil & gas in developing economies, r e - development of aging reservoirs and new oilfield discoveries, rising oil & gas production, growing investments in offshore exploration & production, etc . , and speculated a robust growth during the forecast period . The study includes market forecasting, which would enable our clients to take better decisions while planning their strategy to achieve sustainability in the global directional drilling market . Methodology Followed for Calculation of Market Size : Market Size by Value : Market size, in terms of value, for the year 2021 was calculated based on information collected through exhaustive secondary research and primary surveys, with various key opinion leaders/stakeholders and industry experts . The team interviewed more than 20 companies, 50 industry experts and other value chain stakeholders in the global directional drilling market to obtain the overall market size during 2017 - 2021 , which was validated by the Delphi technique . Taking standard deviation into consideration, the market size was averaged out, to arrive at the market size data for 2017 - 2021 .