Drilling Services Market Size, Share & COVID-19 Impact Analysis, By Service (Directional Drilling {Measurement While Drilling, Logging While Drilling, Rotary Steerable System, Gyro Drilling, Magnetic Drilling, and Others} and Non-Directional Drilling), By Application (Onshore and Offshore {Shallow Water, Deepwater, and Ultra-Deepwater}), By End-User (Oil & Gas, Mining, Water Exploration, and Others), and Regional Forecast, 2020-2027