Multistage Stimulation | Woodford Shale | Diamondback Plugs | SLB
Case Study
Location
United States, North America, Onshore
Details

Challenge: Minimize time required to run in and mill out plugs in multizone well

Solution: Use Diamondback composite drillable frac plug because of its excellent track record

Results: Ran in and milled out 8 Diamondback plugs more than twice as fast as competitor’s 10 plugs

Diamondback Plugs Run In and Mill Out More Than Twice as Fast as Competitor's Plugs

Operator pits Diamondback composite drillable frac plug against its competition in the Oklahoma Woodford Shale—and chooses Diamondback plug

Operator seeks best frac plug for multizone wells

An operator in Oklahoma had two multizone cased hole wells to fracture in a Woodford Shale field. One well had 11 fracture stages being isolated with 10 of a competitor's composite plug. The second well had 9 fracture stages being isolated with 8 plugs. Because of the Diamondback composite drillable plug's excellent track record, the operator selected it for the second well. Because of the similarities in the two completions, the operator took the opportunity to compare the plugs and decide which one to use in future wells.

The Diamondback plug isolates stages during stimulation operations and can be set using wireline, CT, or jointed pipe. A one-way internal check valve is closed when a ball is dropped from the surface while the zone above the plug is being fractured. Fluids from below the plug, however, can flow freely through it. At the time, Schlumberger had run more than 160 Diamondback plugs since their introduction the previous year, and none had set prematurely. Moreover, for those 160, the average millout time was only 18 minutes, compared with the industry average of 30 minutes.

Schlumberger plugs run in and mill out faster than competitor's plug

The competitor's plugs were run in at about 150 ft/min in the horizontal section and 200 ft/min in the vertical section, with an average time of 50 minutes per plug. The 10 competitor plugs set properly and at the desired depths, though one encountered sand at a curve and took more than 90 minutes to release from the wireline setting tool. Millout times of the 10 plugs ranged from 24 to 246 minutes, an average of 85 minutes.

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The Diamondback composite drillable frac plug has rigid slips and an internal shear ring that prevents presetting. Its composite material is designed to be drilled out into small cuttings that can be easily circulated out of the well. A special taper at the end of the plug prevents spinning during millout, reducing millout time.

The Diamondback plug's antipreset feature allowed average run-in speeds of 250 ft/min in the horizontal section and a much faster 450 ft/min in the vertical section—twice as fast as the competitor plugs in the vertical section. The average run-in time per plug was 24 minutes—less than half that of the competitor's.

The Diamondback plug's design and composite material promoted breakup during millout, resulting in smaller, more easily washed-out fragments compared with the competitor’s weaved composite plug. Millout time improved dramatically over the competitor's, with times ranging from 13 to 65 minutes, an average of 26.5 minutes—more than three times faster than the competitor plug.

Operator selects Diamondback plug for future fracture operations

Because of the overall savings in time and associated costs and the plug's reliability, the operator selected Diamondback plugs for all of its future fracture operations.

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