发明名称 |
Pre-stressed annular sealant and method of creating a durable seal in a well bore annulus |
摘要 |
A pre-stressed annular sealant and method of creating a durable seal in a well bore annulus which is based on hydraulic cement that is designed to be easily pumped and placed into a casing-wellbore annulus, to set into a hardened mass, and to then undergo post-set crystal growth and phase changes in the crystalline matrix to combat inherent volumetric shrinkage and to create internally-generated compressive stress in the cement matrix. This internally-generated compressive pre-stressing compensates for tensile stress induced by well operations. The tensile stress must be greater in magnitude than the magnitude of the compressive pre-stress plus the magnitude of the cement's tensile strength before the cement sheath will fail in tension. This expansion and pre-stressing also creates significantly higher shear bond strengths than those developed with ordinary hydraulic cement.
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申请公布号 |
US7712530(B1) |
申请公布日期 |
2010.05.11 |
申请号 |
US20070836306 |
申请日期 |
2007.08.09 |
申请人 |
SUPERIOR ENERGY SERVICES, L.L.C. |
发明人 |
EDGLEY KEVIN;WATTERS LARRY;SABINS FRED;SONNIER PAUL |
分类号 |
E21B33/13;C04B9/12 |
主分类号 |
E21B33/13 |
代理机构 |
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代理人 |
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