| CPC E21B 33/1285 (2013.01) [E21B 23/06 (2013.01); E21B 43/26 (2013.01)] | 19 Claims |
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1. An apparatus comprising:
a seal section configured to encircle a conduit of a downhole tool, the seal section comprising a sealing element formed from an elastic and compressible material configured to encircle the conduit, the sealing element further configured to extend outward and form a hydraulic seal between the downhole tool and an inner wall of a wellbore where the downhole components of the downhole tool; and
a piston section coupled to the seal section, the piston section comprising a first piston and a second piston detachably coupled to the first piston, the first piston and the second piston detachably secured at an initial position within the piston section by a first releasable coupling device,
wherein the first releasable coupling device is configured to release when a fluid pressure level received at the piston section reaches a threshold packer setting pressure level configured to cause the first releasable coupling device to release both the first piston and the second piston while the second piston remains detachably coupled to the first piston, the threshold packer setting pressure level configured to urge the first piston and the second piston to move in a direction toward the sealing element to actuate the sealing element and cause the sealing element to form the hydraulic seal between the downhole tool and the inner wall of the wellbore; and
wherein the second piston is detachably coupled to the first piston by a second releasable coupling device configured to release and to allow the second piston to detach from the first piston and to move independently of the first piston when an activation threshold pressure level of fluid pressure that is higher than the threshold packer setting pressure level received at the piston section from the conduit.
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