Wanted to get your views on the use of HWs while drilling 8-3/4" lateral. We have a 2°, 12-1/4" tangent section. 9-5/8" at ~12,000. Maintain 2° till KOP @ 14,000'. Curve @ 12-14° / 100' to landing point. Laterals are about 10,000' (14,600' TVD). 1.5° motor used to drill lateral. Current BHA consist of motor, NBS, MWD, 5" DP for spacing, 5" HW, 5" DP to surf. Current BHA has 1200' of 5" HWs spaced to be at KOP when at TD. Want to explore laying out the HWs.
Ran some multi-station T&D analysis with as drilled svys till 21,000 (& plan thereafter) and attached the results. It almost looks like past the first 4000' of lateral, the HW does not really help. It does however, seem to push the point where the DP buckles further up the string compared to running without HWs. Eager to hear ya'll thoughts and experience on this subject. Thanks
If possible it would be a benefit to remove the HWDP from the string, it will reduce your hydraulic capacity, increase ECD and increase torque and drag. As soon as the HWDP enters the lateral it will be detrimental to buckling due to the increase in drag (the DP will most likely buckle at the start of the build and the critical buckling force of the DP is higher through the curve than in a tangent).
If the HWDP is required to give sufficient weight to be able to slide with the motor, try modelling running the HWDP at surface i.e drill with the HWDP, keep the HWDP in the low angle section of the well where it will not contribute much of an increase to T&D. This may not be feasible depending on what your buckling model says.
Your Directional Drilling contractor should be in a good position to make the best possible recommendation for your particular well.
For this type of application with low BUR of 2deg/100 I would suggest you consider the use of RSS system with to drive it. POWERDRIVE is capable of drilling these profiles with a long lateral, and ensuring you have excellent bore hole quality thus ensuring you can reach your target TD, and run your completion without problems of localised high value doglegs. Your overall ROP will be higher and hole cleaning will be much improved using an RSS.
Consultant ( sort of retired but keeping in touch )
The best HW to use in this situation is the spiral type.
Proven best of all is the original design, Chance Collar Co/Homco design, now maybe supplied by NOV Grant Prideco.
This design will keep straight when needed and bend evenly along its length when required. The spiral will help move cuttings in tight hole and when horizontal.