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Shifting tool assembly that facilitates controlled pressure equalization

  • US 10,041,331 B2
  • Filed: 02/18/2015
  • Issued: 08/07/2018
  • Est. Priority Date: 02/18/2015
  • Status: Active Grant
First Claim
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1. A downhole system, comprising:

  • a completion string positionable within a wellbore and providing at least an upper seal bore, a lower seal bore axially offset from the upper seal bore, and a downhole device arranged downhole from the upper seal bore, wherein the downhole device provides a sliding sleeve;

    a service tool extendable within the completion string; and

    a shifting tool assembly coupled to the service tool and including a mandrel, a shifting tool coupled to the mandrel, one or more upper equalization seals arranged on the mandrel and configured to be sealably disposed within the upper seal bore, and one or more lower equalization seals arranged on the mandrel and configured to be sealably disposed within the lower seal bore,wherein the shifting tool is engageable with the sliding sleeve to move the downhole device at least partially between a closed position, where a pressure differential between a subterranean formation and an interior of the completion string is borne by primary sealing elements of the downhole device, and an open position, where the pressure differential is borne by at least the one or more upper equalization seals,wherein the pressure differential is borne by at least the one or more upper equalization seals while the downhole device is moved between the closed and open positions, andwherein a differentially isolated chamber is defined between the completion string and the service tool when the upper and lower equalization seals are sealingly disposed in the upper and lower seal bores.

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