Downhole Device
AssigneeDomain Licences Limited
InventorAndrew Jenner
Life of this patent
Estimating the term…
Abstract
A stop collar or like device is formed in one piece to have a portion for a tool to be attached. Movement of the tool allows the collar to be drawn tightly into engagement onto a pipe or other tubular member. A bow centraliser has alternate bows longitudinally offset to reduce initial insertion force. The centraliser may be formed to have end bands of the type used in the stop collar.
Claims11
A one-piece device for engagement over and onto a downhole tubular, the device comprising a generally cylindrical band having at least one arcuate portion with opposing end regions, the end regions being coupled together by a connecting portion having a pair of arm portions extending on respective sides of a body portion, distal ends of the arm portions extending into the end regions, the body portion having a formation for engagement therein of a tool whereby rotation of the body portion by a tool varies the size of the device, the device further comprising engagement means to secure the arm portions with respect to an adjacent end region so that the device can be locked.
A stop collar or like device which is adapted to mount around a tubular member such as a length of pipe, drill string or tubing string to grip the exterior of the tubular member and restrict axial travel of any further associated product that is assembled onto the exterior of the tubular member along the member, the device being characterised in that the construction of the stop collar and a means of activating radial gripping of a tubular member is from a single piece of material.
A method of securing a one-piece stop collar to a tubular comprising sliding the stop collar over the tubular to a desired location, and rotating a portion of the stop collar to draw the collar tighter onto the tubular.
A centralizer having first and second opposing end collars, the end collars being axially separated by plural spring bows, the spring bows forming a generally convex curve, with first bows extending from the first end collar substantially axis-parallel for a first distance before extending via the curve into the second end collar, and second bows extending curvedly from the first end collar and into a substantially axis-parallel portion at the second end collar, whereby the centralizer is formed of a single piece.
Dependencies are inferred from the claim text.