| 主权项 |
1. A casing-connection for use in a downhole wellbore comprising:
a. a first sub having a bored-through inside diameter having a nominal inside diameter similar to a nominal inside diameter of a first casing to which it is connected, and comprising
i. a first circular radius face;ii. a second circular radius face; andiii. a cylindrical portion extending from the first circular radius face to the second circular radius face b. a second sub having a bored-through inside diameter having a nominal inside diameter similar to a nominal inside diameter of a second casing to which it is connected, and comprising:
i. a third circular radius face for mating with the second circular radius face of the first sub; andii. a threaded profile on at least a portion of an outside surface of the second sub; and c. an adjusting collar having an outside diameter similar to an outside diameter of the first casing or the second casing, and comprising:
i. a fourth circular radius face for mating with the first circular radius face of the first sub;ii. a dust seal groove formed on an inner surface thereof, and longitudinally spaced from the fourth circular radius face;iii. a sealing ring fitted in the dust seal groove to seal contact between the adjusting collar and the first sub such that the dust seal groove and the sealing ring are longitudinally spaced from the first and fourth circular radius faces; andiv. a threaded profile on at least a portion of an inner surface of the adjusting collar for threadably connecting to the threaded profile of said second sub,wherein sealing surfaces are formed at connections between the first circular radius face and the fourth circular radius face; between the second circular radius face and the third circular radius face; and between the second sub threaded portion and the adjusting collar threaded portion, wherein the inside diameter and outside diameter respectively of the casing connection, where the casing connection connects to at least one of the first casing or the second casing, is the same as the inside diameter and outside diameter respectively of the casing to which it is connected, and wherein bendability and rotatability of the casing connection is adjustable by tightening or loosening said threaded connection between said second sub and said adjustable collar. |
