Patent ID: 6039120
Filing Date: 2000-03-21
Classification: E21B

Abstract:
An apparatus comprising:an isolation sleeve having a first end, a second end and a longitudinal axis defined between said first end and said second end, said isolation sleeve having a generally tubular shape;an extension sleeve having a first end attached to the second end of the isolation sleeve to form an assembly comprising the isolation sleeve and the extension sleeve, a second end, and a longitudinal axis is that is coaxially aligned with the longitudinal axis of the isolation sleeve, said extension sleeve having a generally tubular shape;wherein the isolation sleeve has an outer surface defining an outer diameter and said extension sleeve has an inner surface defining an inner diameter, wherein said inner surface of said extension sleeve is sized to closely receive the second end of the isolation sleeve;wherein the outer surface of the isolation sleeve near the second end forms an annular wall portion facing the second end;wherein the inside surface of the extension sleeve forms a first annular shoulder portion facing the first end of the extension sleeve, said inside surface further defining threads therein positioned between the first end and the annular shoulder portion;wherein the inside surface of the extension sleeve forms a second annular shoulder portion facing the first end, said second annular shoulder portion being positioned between the first annular shoulder portion and the second end of the extension sleeve; and wherein the outer surface of the isolation sleeve defines threads therein positioned between the annular wall portion and the first end for threadably engaging the threads on the extension sleeve, so that the assembly is adjustable in length between the first end of the isolation sleeve and the second end of the extension sleeve.