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Productive Drilling Saves Three Days of Rig Time


Case study: Chevron joint venture drills 121⁄4-in section of well offshore
Nigeria with PowerDrive RSS in 72 h less time than offset wells

Drill 121.4-in section of Kaka field exploration well offshore Nigeria in less time while improving hole cleaning and log quality.

Productive drilling with fully rotating PowerDrive 900 rotary steerable system (RSS).

Saved three days of rig time. Increased ROP 87%. Improved hole cleaning and LWD resolution. Achieved excellent wellbore quality.

Increase ROP and hole quality
Chevron Nigeria Limited operates the Awodi and Kaka fields offshore Nigeria in a joint venture with the Nigerian National Petroleum Corporation (NNPC). Awodi and Kaka are treated as offset fields for exploration drilling operations because of their proximity to each other. The average time for drilling the 121.4-in sections of wells in the Awodi and Kaka fields with conventional BHAs and mud motors was 155 h.

The 121.4-in sections of four exploration wells.Awodi 2, 3, and 4 and Kaka 1.were drilled below the base of a freshwater sand using conventional BHAs and mud motors, at an average ROP of 47 ft/h. Chevron Nigeria wanted to improve this, as well as hole cleaning and log quality, in the 121.4-in section of the next exploration well.Kaka 2.

Reach TD in less time with productive drilling
Productive drilling using a BHA with a 9-in PowerDrive RSS enabled Chevron Nigeria to achieve all those objectives. The PowerDrive 900, with its unique fully rotating technology, drilled the 7,311-ft-long 121.4-in section at an average ROP of 88 ft/h.87% higher than the 47-ft/h average ROP in the previous wells.

As a result, section TD was reached in just 83 h.much less time than in any of the previous exploration wells drilled with conventional BHAs and mud motors. The average time for drilling the 121.4-in sections of those wells was 155 h.

Save days of rig time
By drilling the 121.4-in section of Kaka 2 in 83 h, the PowerDrive 900 RSS saved Chevron Nigeria 72 h.3 days.of rig time, compared to the 155-h average for the Kaka and Awodi fields. The average ROP for drilling the 121.4-in sections of 4 offset wells with conventional BHAs and mud motors was 47 ft/h. Use of the PowerDrive 900 RSS to drill the 121.4-in section of just 1 well raised the average ROP for the 5 wells to 68 ft/h.a 45% improvement.

In addition to reaching section TD in less time, productive drilling with the PowerDrive 900 RSS improved hole cleaning and LWD resolution—and provided excellent wellbore quality. The PowerDrive 900 RSS was able to achieve these results because of the unique PowerDrive characteristic—every external part rotates. This rotation reduces the chance of differential or mechanical sticking and ensures high ROP and good cuttings flow.

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