Method and apparatus for cementing a well
AssigneeSchlumberger Technology Corporation
InventorsErik Rhein-Knudsen, Claude J. Vercaemer, Laurent P. Prouvost, Arthur W. Milne, Jean-Louis Pessin
Life of this patent
Estimating the term…
Abstract
In one embodiment, the invention relates to a method or process, useful in cementing a well, especially a hydrocarbon well, which is characterized by the use of increased external and internal diameter liners, the method being characterized by provision and use of a novel liner and liner-tool assembly. Novel liner apparatus, a liner-tool assembly, and a fluid circulating tool are also disclosed.
Claims16
A wellbore liner assembly comprising a wellbore liner having a minor section of increased external and internal diameter joined to and communicating with a larger major section of smaller external and internal diameter, the major section provided with sealable ports proximate the junction of the major and minor sections.
Apparatus comprising a casing having a uniform internal diameter, and its smallest internal diameter, at its bottom and terminating in a joining section of decreased internal diameter compared to the internal diameter of the remainder of the casing;
- a liner assembly comprising a wellbore liner having a minor section of increased external and internal diameter joined to and communicating with a larger major section of smaller external and internal diameter, the major section provided with sealable ports proximate the junction of the major and minor sections, said minor section having an external diameter approximating the internal diameter of the remainder of the casing and disposed in the bore of the casing above the joining section, with the casing being of uniform diameter above the minor section, and said major section being disposed such that its sealable ports are proximate and beneath the joining section.
Apparatus comprising:
- (a) a casing terminating in a joining section of decreased internal diameter compared to the internal diameter of the remainder of the casing:
- (b) a liner assembly comprising a wellbore liner having a minor section of increased external and internal diameter joined to and communicating with a larger major section of smaller external and internal diameter, the major section provided with ports proximate the junction of the major and minor sections said minor section having an external diameter approximating the internal diameter of the casing and disposed in the bore of the casing, and said major section disposed such that its ports are proximate and beneath the joining section;
- and
- (c) means for sealing provided to seal the ports.
Dependencies are inferred from the claim text.