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Novel Retrieval Method for HPHT Packers

IP.com Disclosure Number: IPCOM000242441D
Publication Date: 2015-Jul-14
Document File: 1 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

With more wells being drilled and completed in ultra deep formations, down hole packers are now required to perform in extreme High Pressure High Temperature (HPHT) environments. A key advantage to the customer is that these HPHT packers be able to retrieve from the well bore. With the higher pressures and loads found in deeper formations, packer retrieval has become increasingly difficult. The option of retrieval is limited by the inability to pull the gripping mechanisms known as "slips" from the inner diameter (ID) of the casing. The existing technology is now past it's limit and in some cases the packer will not be retrievable. This invention disclosure is for a novel way to pull the slips from the ID of the casing and retrieve the packer. This method incorporates a "disappearing" cone to facilitate the retrieval process. This cone would be manufactured from a dissolvable material that dissolves when exposed to a "retrieval fluid". When the operator is ready to retrieve the packer, the retrieval fluid would be injected into the annulus surrounding the packer to begin dissolving the cone. Once the cone has dissolved, tension can be applied to the tool to retract the slips from the casing and pull the packer from the well. The key to this retrieval method is a dissolvable cone. Cones are used to transfer load from the packer to the slip and then to the casing. The previous method for retrieving HPHT packers involved pulling the slips out and away from the cones which presents a problem at higher pressures and loads because of the “wedge” effect that occurs when the slips bite deeper into the casing. Other factors that may prevent slip retrieval are trapped force and friction between the slips and cone caused by high loading conditions. By incorporating a dissolvable cone into the packer, upon retrieval, the slips will lack sufficient support to remain anchored in the casing because they no longer have the "wedge" fit between the cone and the casing. This also eliminates any effects from friction and helps to mitigate trapped load. The application of tension will then pull the slips from the casing and allow the packer to be retrieved. A key benefit to this retrieval method is that in many cases the geometry of the packer will not change because the loading of the cone is primarily compressive and most dissolving materials will have adequate compressive strength. This would allow the cone material to be changed from steel/cast iron to the dissolvable material with minimal if any dimensional changes. The rest of the packer components can remain “as is” with their current metallurgy (e.g. nickel alloy mandrel, hardened slips, etc.) to meet the requirements for the well environment

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Novel Retrieval Method for HPHT Packers

With more wells being drilled and completed in ultra deep formations, down hole packers are now required to perform in extreme High Pressure High Temperature (HPHT) environments. A key advantage to the customer is that these HPHT packers be able to retrieve from the well bore. With the higher pressures and loads found in deeper formations, packer retrieval has become increasingly difficult. The option of retrieval is limited by the inability to pull the gripping mechanisms known as "slips" from the inner diameter (ID) of the casing. The existing technology is now past it's limit and in some cases the packer will not be retrievable. This invention disclosure is for a novel way to pull the slips from the ID of the casing and retrieve the packer. This method incorporates a "disappearing" cone to facilitate the retrieval process. This cone would be manufactured from a dissolvable material that dissolves when exposed to a "retrieval fluid". When the operator is ready to retrieve the packer, the retrieval fluid would be injected into the annulus surrounding the packer to begin dissolving the cone. Once the cone has dissolved, tension can be applied to the tool to retract the slips from the casing and pull the packer from the well.

The key to this retrieval method is a dissolvable cone. Cones are used to transfer load from the packer to the slip and then to the casing. The previous method for retrieving HPHT packers involved pulling the slips...