Shifting tool assembly that facilitates controlled pressure equalization
First Claim
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.
1 Assignment
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Accused Products
Abstract
An exemplary downhole system includes a completion string positioned within a wellbore and providing at least an upper seal bore and a downhole device that includes a sliding sleeve. A service tool is extendable within the completion string and includes a shifting tool assembly and provides a mandrel, a shifting tool coupled to the mandrel, and upper equalization seals arranged on the mandrel and sealingly engageable with the upper seal bore. 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 assumed by primary sealing elements of the downhole device, and an open position, where the pressure differential is assumed by at least the upper equalization seals.
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Citations
24 Claims
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1. A downhole system, comprising:
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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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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introducing a service tool into a wellbore, the wellbore having a completion string positioned therein that provides at least an upper seal bore, a lower seal bore axially offset from the upper seal bore, and a downhole device, wherein the downhole device is arranged downhole from the upper seal bore and includes a sliding sleeve; extending the service tool at least partially into the completion string, the service tool providing a shifting tool assembly that includes a mandrel, a shifting tool coupled to the mandrel, one or more upper equalization seals arranged on the mandrel uphole from the shifting tool, and one or more lower equalization seals arranged on the mandrel and configured to be sealably disposed within the lower seal bore; sealingly disposing the one or more upper equalization seals and the one or more lower equalization seals on the respective upper seal bore and lower seal bore, wherein a differentially isolated chamber is defined between the completion string and the service tool upon sealingly disposing the upper and lower equalization seals within the upper and lower seal bores, respectively; engaging the shifting tool on 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; and bearing the pressure differential by at least the one or more upper equalization seals while the downhole device is moving between the closed and open positions. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification