Sure Drill Downhole Services brings more than 50 yrs of directional drilling experience to its clients. Directional personnel with Sure Drill Downhole Services have extensive domestic and international experience in locations such as Saudi Arabia , Oman , Qatar , Bahrain , Yemen , India , Japan , Colombia and Mexico .

Domestic locations include North Dakota , Oklahoma , Texas , Louisiana and Arkansas .


Dave Cathey began his career in the Gulf of Mexico reaching the level of driller with Ensco Drilling. He subsequently moved to directional drilling with Sperry-Halliburton in the Middle East. While in Saudi Arabia and Bahrain he gained directional experience in Sidetracking, Short, Medium and Long Radius, Multi-Lateral and S-Type well profiles.

Domestically he has been involved in directional, horizontal, extended reach and multi-lateral drilling in North Dakota, Texas, Arkansas and Oklahoma. He is familiar with well design and well planning. Coming from a drilling background he is familiar with all aspects of drilling operations, from logistics to well planning through completion of directional drilling operations.

Dave Beasley began his career in the early 1990’s in the Gulf of Mexico working for various drilling contractors prior to becoming involved in a Geothermal Drilling project in Japan. From Japan, Dave moved to the Middle East, working primarily on the Saudi Arabian peninsula for Sperry-Sun Halliburton as a Directional Drilling Supervisor. Dave gained directional drilling experience in myriad of different well profiles as well as insight into technology such as Rotary Steerable Drilling Systems, Short, Medium, & Long Radius Wells, Extended Reach, Multi-Lateral, 3-D, S-Well, Build/Hold, Torque & Drag considerations, and Well Planning.

In 2006, Dave moved from Directional Drilling into Well Site Supervision, where he consulted for several independent oil & gas operators, both domestically and internationally. He has extensive knowledge with the planning and execution of well design both on & offshore with emphasis on anti-collision concerns associated with multi-slot platforms.

He is certified (Control # N69638) at the Supervisory Level for Well Control from Wild Well Control. Dave holds an Associate of Science in Petroleum Technology.

Jeb Thornhill began in the industry as an MWD Engineer with Sperry Sun Drilling Services. He was involved with both DWD and FEWD divisions and has experience running these systems throughout the Middle East. He moved from the MWD divison to directional drilling in 2006. As a directional driller for Schlumberger he has been involved in Extended Reach, Horizontal, Underbalanced and S-Type wells domestically in North Dakota, Arkansas and Texas.

Internationally, Jeb has directional drilling experience with Sperry-Halliburton in under-balanced horizontals in Mexico and directional S-Type wells in Yemen. He is familiar in well design, BHA Analysis and Hydraulics modeling.

Jeb currently hold certifications in:

  • DWD 1; 2; 3
  • FEWD 1; 2
  • Log Quality Analysis
  • Survey Quality Analysis

Jeb also holds a BA from the University of Texas at Austin.