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US 5,040,827 AGranted
Method and apparatus for improved oilfield connections
AssigneeTubular Technology, Inc.
InventorRichard W. DeLange
Life of this patent
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AssigneeTubular Technology, Inc.
InventorRichard W. DeLange
Estimating the term…
An improved method of making up a pressure sealing threaded connection for oilfield country tubular goods is provided. A threaded connection is of the non-shouldered type, and includes a pin member having an external tapered thread and a box member having an internal tapered thread. The actual pitch diameter of the pin thread and the box thread are measured and preferably recorded on the outer cylindrical surface of each respective member. An indicator is positioned on the pin member at a preselected location with respect to the pin face end surface. The pin member and box member are made up to form the threaded connection, while the position of the box face end surface is monitored. Make-up of the connection is terminated in response to this position and as a function of the recorded deviations on the pin and box members. In one embodiment, a hold down block is temporarily secured to the pin member, and a measuring probe supported by the hold down block is positioned such that its free end is directed toward the pin face end surface. A gage is used for determining a baseline reading position of the probe with respect to the pin face end surface. A computer is provided for comparing the position of the box face end surface with respect to the baseline reading position during make up of threaded connection. The method and apparatus of the present invention may be easily and reliably used to provide a highly reliable fluid-tight connection for non-shouldered threads of oilfield tubulars, including API threaded connections.
The method of making up a pressure sealing threaded connection for oilfield country tubular good, the threaded connection including a pin member having an external tapered thread extending axially from a pin face end surface to a last scratch thread on the pin member, and a box member having an internal tapered thread extending from a box face end surface to a last scratch on the box member, the method comprising:
A threaded connection for oilfield country tubular goods, the threaded connection including a pin member having an external tapered thread extending axially from a pin face end surface to a last scratch thread on the pin member, and a box member having an internal tapered thread extending from a box face end surface to a last scratch thread on the box member, the connection further comprising:
Apparatus for making up a threaded connection for oilfield country tubular goods, the threaded connection including a pin member having an external tapered thread extending axially from a pin face end surface to a last scratch thread on the pin member, and a box member having an internal tapered thread extending from a box face end surface to an internal scratch on the box member, the apparatus comprising:
Dependencies are inferred from the claim text.