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Case Study: South Kuwait Operator Cures Losses and Saves 60 Hours of Rig Time Using FORM-A-BLOK Pill

High-performance, high-strength pill slurry stabilizes well with natural fractures

Challenge: Stop mud losses in 6 1/2-in sidetrack after experiencing total losses to natural fractures in the Najmah Formation of South Kuwait.

Solution: Pump a slurry containing FORM-A-BLOK high-performance, high-strength lost circulation pill to cure losses.

Result:

  • Sealed the fractures, enabling the operator to drill to TD.
  • Saved 60 hours of rig time with throughnozzle application of slurry as opposed to tripping in and out of hole for cementing.

Cure mud losses and drill to TD while maintaining well control

An operator was drilling a 6 1/2-in sidetrack in South Kuwait and experienced total losses at 4,245-m [13,928-ft] MD, immediately after entering the Najmah Formation, which includes naturally fractured carbonate reservoirs. Despite efforts to seal the wellbore with conventional lost circulation material (LCM) pills and three cement plugs, the operator again lost drilling fluid at a rate of 130–150 bbl/h after drilling ahead 46 m [150 ft]. The operator needed a solution for reestablishing and maintaining well control, which would also address issues with NPT.

Form plug with through-nozzle application of slurry of FORM-A-BLOK pill

M-I SWACO recommended pumping a slurry containing the FORM-A-BLOK pill through the bit nozzles into the thief zones to prevent further losses in the natural fractures of the Najmah Formation. The FORM-A-BLOK pill is a high-solids pill that defluidizes to form a high-strength plug and is time or temperature independent. This application would eliminate the rig time required to trip in and out of the well that is associated with cementing.

Successfully reestablish well control and save 60 hours of rig time

While the FORM-A-BLOK pill slurry was being pumped, the well began to flow. The pill helped successfully cure losses in the fractured zone and enabled the operator to increase the drilling fluid density to achieve required hydrostatic head. The through-nozzle application resulted in an estimated savings of 60 rig hours as compared with cementing. No loss or gain was observed in the well.


Download: South Kuwait Operator Cures Losses and Saves 60 Hours of Rig Time Using FORM-A-BLOK Pill (0.23 MB PDF)

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FORM-A-BLOK Pill Saves Operator 60 Hours of Rig Time

South Kuwait Operator Cures Losses and Saves 60 Hours of Rig Time Using FORM-A-BLOK Pill
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