Nov 16 2017
Case Study: Driver™ Reduces Stick-Slip
Two 7” Driver™ tools were run in a Rotary Steerable Assembly as a trial to improve weight transfer to the bit, and also to reduce vibration & Stick-Slip within the BHA. The 8 ½” section goal was to drill from the 9 5/8” casing shoe at 9,820’, building from 78° to horizontal, before initiating an 87° left turn, whilst holding horizontal to section TD at 16,569’. A new M222 PDC bit was utilised, consistent with the offset wells.
The 6,740’ section was successfully drilled in 96.7 hours, with a drilling ROP of 69.6ft/hr. Offset ROP’s varied between 57ft/hr to 78ft/hr. A significant reduction in Stick-Slip was measured at the LWD tool, with severe Stick-Slip held below 2% for the entire section. The best offset run had measured Severe Stick-Slip, with intervals in excess of 30 minutes, for 20% of the 8 ½” section. Bit grading revealed Worn Cutters on the Driver™ assembly bit, compared to chipped teeth witnessed on the offset runs; suggesting improved consistent WOB.
Download complete Case Study here...
Please login with your email address to access this file.
If you do not have already have an account, please fill in the registration form to create one.
You will be required to verify your email address to activate your account. Please check your spam mailbox if a verification email does not arrive imminently.