BP Uses Armor Cladding to Increase Average Bit ROP 36% and Reduce Drilling Time 179 Hours over 8 Runs | Schlumberger
Case Study
Location
United States, North America, Onshore
Details

By replacing a matrix bit with a modified steel-bodied bit shielded with Aegis armor cladding, BP made significant gains in drilling performance. The 12 1/4-in vertical interval in each of 8 wells was drilled shoe-to-shoe in a single run. ROP increased by an average of 36% compared with direct offset runs of matrix PDC bits, saving an estimated 179 hours of drilling time across the 8 runs.

Products Used

BP Uses Armor Cladding to Increase Average Bit ROP 36% and Reduce Drilling Time 179 Hours over 8 Runs

Advanced blade-face armor enables more aggressive steel-bit design to increase wear resistance and boost ROP performance

The operator’s concerns

BP wanted the highest possible ROP while drilling 12 1/4-in vertical intervals from shoe-to-shoe in single runs. The series of wells are in Oklahoma, through a formation that includes soft shale interbedded with sandstone and limestone.

What was tried first

Previous bit runs used 12 1/4-in matrix PDC bits to successfully drill the interval in a single run, but it was thought that there could be an opportunity to further improve ROP by modifying the bit design.

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Test bit 1 with Aegis cladding reached higher average ROP vs. offset averages over four total test runs.

What Schlumberger recommended

Steel-bodied bits enable bit-body geometries more favorable to better evacuate cuttings from the bit face. But conventional steel-bodied bits are prone to erosion, so bit balling occurs by positioning the nozzles to direct the hydraulic energy away from the cutting structure. Smith Bits, a Schlumberger company, solved this with the introduction of Aegis armor cladding. The advanced strips of shielding protect blade faces on steel-bodied bits, enabling Smith Bits to design steel bits with taller blades and an increased junk-slot area.

What BP achieved

Two new-built steel-bodied bits with Aegis cladding were run in 8 different wells, for a total of 8 bit runs. BP was able to drill the respective intervals from shoe-to-shoe in a single run. ROP with bits shielded by Aegis armor cladding increased by an average of 36%, compared with direct offset runs of matrix PDC bits. This enabled BP to save an estimated 179 hours of drilling time across the 8 runs.

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Over four total bit runs, ROP consistently improved using test bit 2 shielded by Aegis cladding.
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