Schlumberger

Case Study: Eliminating Water Cut with Water Shutoff Treatment

CoilFLATE permanent bridge plug and OrganoSEAL fluid boost oil production in the Gulf of Mexico

Challenge: Effectively shut off water production in 7-in [177.8 mm] liner.

Solution: Set 3-in [76.2 mm] CoilFLATE packer as a mechanical isolation device to effectively place OrganoSEAL F water shutoff treatment fluid in the water producing section of the well.

Result: Eliminated water production and increased oil production.

Water shutoff treatment

A Gulf of Mexico well in the Calcarenitas formation was drilled as an oil producer and completed with a 7-in [177.8 mm] liner. The minimum restriction in the well was 3.675 in [93.345 mm]. Before the water shutoff treatment, the well had been shut in for 54 months because of high water cut.The goals were to

  • set the CoilFLATE packer in a 65-ft [19.8 m] window (at 10,500 ft to 10,435 ft [3,200 m to 3,180.6 m])
  • inject OrganoSEAL F fluid below the packer
  • leave the packer in the well as a permanent bridge plug
  • place a 30-ft [9 m] cement plug on top of the bridge plug
  • perforate a new zone above the packer.

Casing preparation

A dummy run was performed with the Jet Blaster jetting scale removal and ACTive live in-well performance service—an optical fiber pressure, temperature, and casing collar locator (CCL) tool—to correlate depth in real time, clean the ID of the casing at setting depth, and drift the casing. The setting depth had to be accurate to ensure that the top of the cement plug to be placed on the bridge plug was below the new interval to be perforated. The ACTive service in the CT string provided accurate real-time transmission of casing collar information from the downhole CCL tool to the surface acquisition system for correlation.

The packer was run in hole and set at 10,480 ft [3,194 m] in the 6.184-in [157.074-mm] ID liner. After the packer was set, 200 bbl of OrganoSEAL F organic crosslinked gel and 20 bbl of SqueezeCRETE cement were injected through the packer to shut off water production from the zone below. The coiled tubing was disconnected from the packer and a 30-ft [9-m] cement plug was placed on it to make the packer a permanent bridge plug.

100% oil production

New perforations were made from 10,320 ft to 10,420 ft [3,145 m to 3,176 m], and 10 days after the water shutoff treatment, oil production was at 100%—zero water cut.


Download: Eliminating Water Cut with Water Shutoff Treatment (0.71 MB PDF)

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