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New Casing Valve in a Deep-Well Sour Environment

To complement managed-pressure-drilling systems, the possibility of introducing new safety barriers directly into the well has been considered. Among these barriers, a new casing valve (CV) with surface control lines, rated for high-pressure/high-temperature and sour environments, has been developed. This paper describes the first application of the 10¾-in. CV in a deep-well sour environment.

Background

In 2011, a new 10¾-in. 97.1-lbm/ft CV was installed successfully in a well at a measured depth (MD) of 3675 m and a 50° inclination in a hydrogen sulfide (H2S) environment of up to 18%. The well profile was implemented with an S-shaped trajectory featuring a pseudocatenary approach. The CV was set as a permanent installation in 10¾-in. production casing approximately 400 m inside the preceding 13⅜-in.-casing shoe (Fig. 1). CV position details are as follows:

  • CV setting depth: 3675-m MD [2899-m total vertical depth (TVD)]
  • 13⅜-in.-casing shoe: 4075-m MD (3155-m TVD) 
  • 10¾-in.-casing shoe: 4947-m MD (3837-m TVD) 
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 16936, “New 10¾-in. High-Pressure/High-Temperature Casing Valve Successfully Applied in a Deep-Well Sour Environment,” by Paolo Ferrara and Claudio Molaschi, Eni E&P; Bill Menard, Weatherford; and Francesca Rinaldi, Eni E&P, prepared for the 2013 International Petroleum Technology Conference, Beijing, 26–28 March. The paper has not been peer reviewed. Copyright 2013 International Petroleum Technology Conference. Reproduced by permission.
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New Casing Valve in a Deep-Well Sour Environment

01 May 2014

Volume: 66 | Issue: 5

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