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Expandable HP/HT Liner Hanger Increases Pressure Integrity

This paper describes a high-pressure/high-temperature (HP/HT) expandable liner hanger product that offers metal-to-metal and elastomer sealing capabilities at the liner top in the host casing. The system delivers increased hanging capacity and seal integrity for installing casing strings of various lengths. The expansion process is achieved using a multipiston hydraulic running tool with pressure application to displace an expander inside the hanger body.

Expandable Technology

Expandable technology provides operators an alternative to conventional liner hanger and packer systems that typically use slips and cone components configured on the outer diameter of a hanger body that require translation of the slips onto the cone for installation of the liner hanger in the host casing. Conventional liner-top packer systems typically also require drillstring weight for the mechanical force required to energize a sealing element that produces the annular seal between the liner and host casing strings. Fig. 1 shows a comparison between a conventional liner hanger and packer system and the system described by the authors of the complete paper.

Fig. 1—Comparison of conventional vs. expandable liner hanger and packer systems.

 

Expandable liner hanger and packer technology has evolved from years of product development and has gained market share with the increase of successful field installations. These systems consist of an integral hanger body design that incorporates elastomeric sealing elements normally bonded on the outer diameter. Hanger body expansion into the host casing is accomplished with the application of hydraulic pressure through a setting tool to create enough force to displace an anvil through the hanger body inner diameter. Interference between the hanger body inner diameter and the anvil outer diameter creates the interaction necessary for the creation of radial growth required to facilitate interference with the host casing.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 29494, “HP/HT Expandable Liner Hanger Technology With Superior Pressure Integrity,” by Edward S. Royer and Robert A. Turney, TIW, A Drill-Quip Company, prepared for the 2019 Offshore Technology Conference, Houston, 6–9 May. The paper has not been peer reviewed. Copyright 2019 Offshore Technology Conference. Reproduced by permission.
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Expandable HP/HT Liner Hanger Increases Pressure Integrity

01 March 2020

Volume: 72 | Issue: 3

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