Improved Drilling Performance Saves Rumaila

Case study

Improved Drilling Performance Saves Rumaila Operating Organization More Than USD 200,000 PowerPak ERT high-performance motor reaches TD in challenging 8½-in section 3 days ahead of plan with zero NPT

Challenge Drill section in one run Drill 8½-in hole section in the South Rumaila The 8½-in sections of wells in Iraq’s South Rumaila oil field are drilled through the Shuaiba field in one run at increased ROP. formation, which is hard, compact limestone, and then into the Zubair formation, which is made up of shale, sandstone, and siltstone. Historically, these sections had been drilled with rotary Solution BHAs, at a low ROP. The Rumaila Operating Organization (ROO) successfully increased drilling Use PowerPak* ERT high-performance performance by using PowerPak XP* extended power steerable motors in the 8½-in sections. steerable motor incorporating even Schlumberger Integrated Project Management (IPM)—acting as project manager for ROO— rubber thickness technology. wanted to further improve performance by drilling the section in just one run at a higher ROP. Results Increase average ROP ■■ Drilled entire 8½-in section in single run Those objectives were achieved by drilling the section with a PowerPak ERT high-performance with zero NPT. steerable motor, which has an even-rubber-thickness power section technology to deliver more ■■ Increased average ROP more than 36%. than twice the torque output of conventional motors. The PowerPak ERT motor reduced stick/slip, ■■ Reached section TD 3 days ahead of plan. provided higher differential pressures, increased average ROP over 36%, and improved drilling ■■ Saved the customer more than USD 200,000. performance in the hard siltstone and sandstone of the Zubair formation.

The PowerPak ERT motor is now the default choice for drilling 8½-in hole sections in the South Rumaila field. 250 PowerPak ERT motor, Well A 3 13 ⁄8-in casing Conventional motor, Well B Conventional motor, Well C 1,000 Conventional motor, Well D

1,750 5 9 ⁄8-in casing MD below 2,500 rotary kelly bushing, m

3,250 7-in casing

020 40 Time, days The PowerPak ERT motor drilled the entire 8½-in section in one run, without the flat time experienced in that section in previous South Rumaila field wells.

Drilling CASE STUDY: High-performance motor reaches TD 3 days ahead of plan with zero NPT

1,700 Planned drilling time Actual drilling time

2,300

MD below 2,900 rotary kelly bushing, m 3,500

2 610 Time, days The even rubber thickness on the inside of the stator used in the PowerPak ERT power section improved The PowerPak ERT motor saved ROO more than USD 200,000 in rig time by drilling the 8½-in section in 3 days drilling performance. less time than planned.

35 PowerPak ERT motor Conventional motor

25 m/h

15 verage RO P, A

Entire 8½-in section Before Shuaiba Shuaiba and Zubair formation formations

Use of the PowerPak ERT motor increased average ROP in the 8½-in section more than 36%.

Save rig time and cost IPM’s use of the PowerPak ERT high-performance motor brought about a step change in performance compared to conventional drilling. The PowerPak ERT motor drilled the entire 8½-in section in a single run with zero NPT—in 3 days less time than planned. At the usual Rumaila rig rate of USD 67,000 per day, that was a savings of more than USD 200,000. In addition, the fast drilling reduced the time the shale in the Zubair formation was exposed, so time- dependent shale swelling was not an issue during wireline logging and casing running. As a result of the shoe-to-shoe reliability it demonstrated, the PowerPak ERT motor was made the default choice for drilling the 8½-in sections of future wells in South Rumaila field.

Contact your local Schlumberger representative to learn more.

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