BHA Design Check-list_Rev.1

Initial BHA Design Checklist Date: Well:

Created by: Rig:

Step 1. Downhole Hazard Awareness ☐

Rig Daily Reports and DD Slide Sheets from Offset Wells collected

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Lithology information obtained from IES

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Downhole Hazards and Directional Tendencies Matrix created

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Additional actions required to address Collar-to-Formation contact /interaction issues

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Parameter Schedule identified Remarks

Step 2. Well Trajectory Quick-check ☐

Extended Reach Drilling (ERD) plot created

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Drilling Envelope Reach plots created

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Directional Difficulty plot created

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DDI / Tortuosity / Absolute Tortuosity vs. Depth plots created

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Casing shoe in tangent section checked

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Enough distance between the Casing Shoe and the Directional Section

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No MWD Tool Interference at Minimum Distance between well and neighbors

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Formations were considered for Build/Turn/Tangent Sections

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DLS within limits of Tools and BHA

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Side Tracks, Special Tools, and specific Procedures considered Remarks

Rev.1.0 July 2016 © 2016 Weatherford. All rights reserved. Proprietary and Confidential

Initial BHA Design Checklist

Step 3. Steerable System Selection (Choose one) ☐

Steerable Assembly selected for right application (2D/3D, cont. rotation, holdtangent, etc.) Steerable System Analysis (choose one) ☐ Rotary Assembly: Historical Directional Tendencies or “rule of thumb” chart ☐ Drilling Motor: BUR estimation, PS Selection, FIT, and CSG Pass-through ☐ Rotary Steerable: BHA Design Guidelines Rev B. Remarks

Step 4. Sensor Requirements ☐

Maximum offset allowance agreed upon with Client

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Sensor order does not violate other sensor measurements and acceptable by Client

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Tool sizes adequate for hole size outlined in Global Bid Reference

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Tools with Stabs (ex. Density Stab) considered in BHA Design logic: utilized and/or protected

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Vibration Sensors present on all Tools

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Other Sensors considered for application (ex. BAP, Temperature, etc.) Remarks

Rev.1.0 July 2016 © 2016 Weatherford. All rights reserved. Proprietary and Confidential

Initial BHA Design Checklist

Step 5. Drill Collar Size, Quantity, and Utilization ☐

Drill Collar size selected based on Stability Index (SI) DC Size: _____________ SI: _____________

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Heavy Weight Drill Pipe size selected based on Stability Index (SI) HWDP Size: _____________ SI: _____________

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Other factors considered in DC and HWDP diameter selection:

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DC quantity reduced as much as possible

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Use of similar sized Drill Collars from one Hole Section to another considered Remarks

Step 6. Drillstem Fatigue Avoidance ☐

All Bending Strength Ratio (BSR) values for DC connections within recommended ranges

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All Stiffness Ratio (SR) values for DC tube geometries within recommended ranges

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Stabilizers not mated to components with variable geometry (OD and/or ID) (ex. Bottle-neck crossover, Float Sub, etc.)

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Neutral Point located in BHA, HWDP or Drill Collars. Remarks

Rev.1.0 July 2016 © 2016 Weatherford. All rights reserved. Proprietary and Confidential

Initial BHA Design Checklist

Step 7. Drilling Jar Placement ☐

Jar minimum tension/compression of 20% at all WOBs

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Jar placed with a minimum of 2 joints above and 2 joints below of DC or HWDP.

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Jar not located as a transition between 2 changing geometries (ex. between DC to HWDP or HWDP to DP).

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Slinger added to Drillstem (recommended for any hole less than 3000’ or any hole with high deviation)

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Slinger minimum tension/compression of 20% at all WOBs

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Slinger placed with a minimum of 2 joints above and 2 joints below of DC or HWDP.

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Minimum distance of at least 1500’ between Jars.

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Jars not located below reamers, stabilizers, key-seat wipers, or any other tool with an OD that exceeds that of the Drilling Jar.

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Jar Placement Calculator used to determine the maximum impulse / impact for both up and down jarring

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Impulse and Impact not zero at selected Jar location Remarks

Step 8. Azimuth Uncertainty-check ☐

Azimuth error within 0.5 degrees

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Re-ordering / addition Non-magnetic Drill Collars attempted to reduce Azimuth error

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If azimuth error criteria not achieved, short collar correction (theoretical z-axis value) or other Survey Management techniques reviewed

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If azimuth error criteria not achieved, Client notified Rev.1.0 July 2016 © 2016 Weatherford. All rights reserved. Proprietary and Confidential

Initial BHA Design Checklist Remarks

Step 9. Stabilizer Hydro-check ☐

All JSA values above minimum recommended

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All Annular velocities values within recommended range

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All Cuttings Bed Height values below maximum allowable

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All Blade contact pressure values less than 300psi

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All Taper Angle values below minimum recommended

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All Wrap (Twist) Angle values within recommended range Remarks

Step 10. Invisible Lost Time - Surface ☐

Rack-back Plan created

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BHA designed to achieve even-stand lengths

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If applicable, M/LWD tools to be kept connected while racking back to dump memory and re-program offline Remarks

Final Remarks Rev.1.0 July 2016 © 2016 Weatherford. All rights reserved. Proprietary and Confidential

Initial BHA Design Checklist

Rev.1.0 July 2016 © 2016 Weatherford. All rights reserved. Proprietary and Confidential