Weatherford Technology Holdings, LLC

Weatherford/lamb, Inc.

Michael C Derby

Brandon C Goodman

Charles D Parker

Simon John Harrall

Patrick James Zimmerman

Paul L Smith

Patrick J Zimmerman

A device and method to control the rate of radial expansion of a compressible sealing element on a packer over the longitudinal length of the sealing element. By varying the rate of compression of the element, the rate of radial expansion of the corresponding portions of the element may also be controlled. Additionally, the rate of radial expansion may also be controlled by controlling the direction and amount of radial expansion along the length of the sealing by reinforcing certain portions of the sealing element while decreasing the rigidity of the reinforcement for other portions.

Extended length packer with timed setting

A packer has a swellable element and has end rings and compressible elements at each end of the swellable element. The packer may be first set using internal bore pressure to compress one of the compressible elements against one of the end rings with a first hydraulic setting mechanism. The packer may then be set a second time using annulus pressure to compress against the other compressible element with a second hydraulic setting mechanism. Either way, the compressible elements are compressed to expand out to the borehole and to limit extrusion of the swellable element outside the compressed elements.

Packer having swellable and compressible elements

A device and method prevent damage to an anti-extrusion device on a tool, such as a plug or a packer, prior to and during setting of the tool. Typically, the upper or outer edges of the anti-extrusion device are relatively delicate. A reinforcing band on the device's sheath strengthens or armors the upper or outer edge of the anti-extrusion device so the anti-extrusion device may be protected while running the tool into the well or casing. Longitudinal slots on the sheath allow the sheath to expand at least partially with the expansion of the sealing element, while the reinforcing band resists expansion of the distal edge of the sheath.

Split foldback rings with anti-hooping band

A downhole tool has a mandrel with packing elements. Collars between the packing elements define ports communicating with gaps between the packing elements and the mandrels. Opposing piston housings on the mandrel can move in opposing directions to compress the packing elements against the collars. Each piston housing defines a space with the mandrel and has a second port communicating with the gap. Pistons disposed in the spaces are temporarily affixed thereto. Hydraulic pressure communicated through the mandrel's bore acts against the pistons. While affixed to the piston housings, the pistons move the piston housings toward the packing elements to compress then. When the packing elements set, continued pressure breaks shear pins affixing the pistons to the piston housings so the pistons move and eventually seal fluid communication between the second ports in the pistons and the gaps.

Downhole tool having setting valve for packing element

A hydraulically set packer has a mandrel with an internal bore and a port communicating the internal bore outside the mandrel. A packing element disposed on the mandrel can be compressed by a piston to engage the borehole. The piston is disposed on the mandrel on a first side of the packing element and moves against the packing element when tubing pressure is communicated into a first piston chamber via the mandrel's port. To increase the setting forces, a sleeve disposed between the packing element and the mandrel defines a space communicating an opposite side of the packing element with a second pressure chamber of the piston. During high pressure operations, high pressure on the first side of the packing element acts with high pressure on the first side of the piston, increasing the pistons movement from a high pressure region to a low pressure region.

Hydraulic set packer with piston to annulus communication

A device and method allow a longer sealing element to be used on a packer or other downhole tool while providing an increase in the total amount of setting force that can be used and providing for more uniform or balanced setting of the sealing element. The packer may be first set using internal bore pressure to radially expand one end of the sealing element with a first hydraulic setting mechanism. The packer may then be set a second time using annulus pressure to continue the radial expansion of the sealing element with a second hydraulic setting mechanism.

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Houston, TX, United States of America

Michael C Derby