Improving wellbore quality and enhancing ROP

Operators are increasingly under pressure to maximize margins and complete ever more complex projects with improved speed, accuracy and reliability.

Challenge

Operators are increasingly under pressure to maximize margins and complete ever more complex projects with improved speed, accuracy and reliability. An operator in the Bakken wanted to increase profitability by reducing torque and drag on the curve and lateral sections, to allow for easier completion of operations. In order to do this it needed to drill a shallow angle tangent while minimizing dogleg to create a smooth, straight well.

Solutions

The client selected to deploy D-Tech’s RST to help achieve its objectives. The targeted functionality of the RST675 was perfect for the lower, land-based directional drilling needed for this project and was proven to hold inclination even at shallow angles of 5 degrees.

In order to increase ROP and reduce stick-slip, a 7/8 3.0 stage, a 0.16 rev/gal motor was run between the RST and MWD, to improve the quality and smoothness of the well.

From its experience in drilling other shale plays, D-Tech also recommended a 6 blade, short gauge bit with a TFA of 0.77 in2, which was used by the operator.

Results

The simple, accurate and intuitive nature of the D-Tech tool meant that the entire section of 8,556ft was completed with a single RST and two bit runs. The inclination was maintained within 1 degree of the target while in inclination hold mode, while azimuth corrections were made using a gravity tool face mode while still maintaining inclination. The result was a smooth wellbore with doglegs averaging 0.75 degrees/100ft.

The section was completed faster than any offset well drilled using a conventional BHA, reaching the target destination at least 1.25 days earlier than expected.