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Hardening news and technical articles from Oil & Gas Journal. Search Hardening latest and archived news and articles

  1. Appropriate practices avoid tube fitting failures

    Magazine Articles

    Mon, 7 Oct 2002

    to the back ferrule (Fig. 3). The nitride hardening of the ferrule led to the failure, although ..... the fitting manufacturer, considered nitride hardening as the best ferrule hardening technology at the time of the fitting's manufacturing

  2. Russian field tests yield cements for arctic wells

    Magazine Articles

    Mon, 21 May 2007

    kinetic deviations during the hydration of hardening cement in contrast to hydration at normal ..... mechanism was the basis to design materials hardening at temperatures below freezing, including ..... crystallization is a limiting stage of the hardening process. Correspondingly, by adding

  1. Watching Government: Systems and weather events

    Magazine Articles

    Mon, 31 Mar 2014

    said. Two kinds of options It said options to reduce such vulnerability fall into two broad categories: hardening and resiliency. " Hardening measures involve physical changes that improve the durability and stability of specific pieces of infrastructure

  2. Tests prove indentation technique for assessment of in-service line pipe

    Magazine Articles

    Mon, 13 Oct 2003

    deformation process is similar to the work- hardening behavior of the uniaxial tensile test ..... determined by a constant (c) and the work- hardening exponent (n) for steels in Equation ..... of steels. The exact values of work- hardening exponent, equivalent stress, and strain

  3. Changes proposed for determining line pipe wall thickness

    Magazine Articles

    Mon, 21 Feb 2005

    to pressures uses an elastic, linear hardening stress-strain diagram (showing the ..... proposed equation for calculating the hardening modulus is based upon the assumption ..... of the yield strength, and linear hardening lasts up to the yield stress (Equation

  4. UFRJ, Petrobras study strength behavior of expandable tubulars

    Magazine Articles

    Mon, 17 Nov 2008

    took into account material kinematic hardening , contact between tubulars and the conical ..... material behavior. We followed a kinematic hardening plasticity model in addition to the isotropic model ..... induced anisotropy caused by strain- hardening (Bauschinger effect). Interestingly

  5. Russians study annulus cement in Arctic wells

    Magazine Articles

    Mon, 28 Aug 2006

    Form a tight cement sheath. Hydration, hardening The processes of Portland cement hydration and structure ..... use thermal methods to intensify cement hardening (heating the mixing liquid; squeezing liquid and ..... destruction. This is achieved by: Cement hardening under absolute values of negative temperature

  6. DRILLING CONSORTIUM—2 (Conclusion): Drilling campaign obtains continuous improvement

    Magazine Articles

    Mon, 1 Aug 2011

    experiences and best practices in similar incidents. The project meetings for the following wells decided to continue using rapid hardening industry cement systems for the 30-in. casing. 2 The next sections frequently included foam cement for improving well

  7. TECHNOLOGY More precise pipe wall calculations developed

    Magazine Articles

    Mon, 29 Apr 1996

    purposes, we will use an elastic, linearly hardening stress-strain diagram, which is simpler ..... thickness. Equation 32 for calculating hardening modulus is based on the assumption that ..... 70% of yield strength and the linear hardening lasts up to the yield strength. The

  8. Permafrost Cement - Conclusion: Ceramicrete blends produce strong, low-permeability cements for arctic use

    Magazine Articles

    Mon, 16 May 2005

    yield a pumping time longer than 5 hr. At the same time, its hardening also took much longer. Click here to enlarge image To reduce ..... time. As MgO content increased, the thickening as well as hardening time became shorter. Thus, adjusting the MgO content allows

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