Reverse circulation cementing system for cementing a liner
First Claim
1. A method of cementing a liner in a wellbore extending through a subterranean zone using reverse circulation, the method comprising the steps of:
- a. running a tubing string into the wellbore so that a wellbore annulus is defined therebetween, the tubing string defining an interior passageway along its length and having a reverse circulation assembly, a liner hanger, and a liner positioned below the liner hanger;
b. circulating fluid along a conventional circulation path during step a) by flowing fluid downhole through the interior passageway and uphole through the wellbore annulus;
c. sealing the wellbore annulus uphole from the liner by setting an annular isolation device in the wellbore annulus; and
d. flowing cement along a reverse circulation path downhole from the annular isolation device by opening a reverse circulation port of the reverse circulation assembly to permit fluid flow from the interior passageway to the wellbore annulus at a position between the annular isolation device and the liner hanger.
1 Assignment
0 Petitions
Accused Products
Abstract
Reverse circulation cementing of a liner in a wellbore extending through a subterranean formation is presented. A running tool with expansion cone, release assembly, annular isolation device, and reverse circulation assembly is run-in with a liner. The annular isolation device is set against the casing. A valve, such as a dropped-ball operated sliding sleeve valve, opens reverse circulation ports for the cementing operation. The liner annulus is cemented using reverse circulation. The expandable liner hanger is expanded into engagement with the casing. Conventional circulation is restored. The running tool is released and pulled from the hole.
13 Citations
24 Claims
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1. A method of cementing a liner in a wellbore extending through a subterranean zone using reverse circulation, the method comprising the steps of:
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a. running a tubing string into the wellbore so that a wellbore annulus is defined therebetween, the tubing string defining an interior passageway along its length and having a reverse circulation assembly, a liner hanger, and a liner positioned below the liner hanger; b. circulating fluid along a conventional circulation path during step a) by flowing fluid downhole through the interior passageway and uphole through the wellbore annulus; c. sealing the wellbore annulus uphole from the liner by setting an annular isolation device in the wellbore annulus; and d. flowing cement along a reverse circulation path downhole from the annular isolation device by opening a reverse circulation port of the reverse circulation assembly to permit fluid flow from the interior passageway to the wellbore annulus at a position between the annular isolation device and the liner hanger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of cementing a liner in a wellbore extending through a subterranean zone using reverse circulation, the method comprising the steps of:
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a. running a tubing string into the wellbore, defining a wellbore annulus therebetween, the tubing string having a reverse circulation assembly, a liner hanger, a liner positioned below the liner hanger, and defining an interior passageway along its length; b. circulating fluid along a conventional circulation path during step a) by flowing fluid downhole through the interior passageway and uphole through the wellbore annulus; c. sealing the wellbore annulus uphole from the liner; d. flowing cement along a reverse circulation path downhole from an annular isolation device, downhole along the length of the liner, and uphole through the interior passageway along the liner; and e. running a cement plug downhole through the interior passageway at the end of step d). - View Dependent Claims (23, 24)
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Specification