Tubing connector

A tubing connector body of the type for joining oil or gas well tubing string to coil tubing connected to a tube of oil or gas well tubing string for use downhole in oil or gas well operations, the connector body comprising a male/spigott end portion fitted concentrically within a corresponding end of the tube, the end portion having a plurality of depressions or holes preformed to receive and coinciding with localised depressions formed by plastic deformation of the walls of the tube whereby the connector body and tube are connected together;

• in combination with a jig, wherein the tubing is locally depressed into mating engagement with the connector body by mounting of the jig over the tubing, the jig having dimple-forming pins, each adapted to be pressed by pneumatic or hydraulic ram to form the dimples;
• and further in combination with a yoke having jaws, wherein the jig has an annular recess extending around an or each end thereof to enable mounting of the jaws of the yoke thereto, which yoke has a pneumatic or hydraulic ram to press the dimple forming pin(s) of the jig into the tubing.

A jig for use in forming the tubing connector body of the type for joining oil or gas well tubing string to coil tubing connected to a tube of oil or gas well tubing string for use downhole in oil or gas well operations, the connector body comprising a male/spigott end portion fitted concentrically within a corresponding end of the tube, the end portion having a plurality of depressions or holes preformed to receive and coinciding with localised depressions formed by plastic deformation of the walls of the tube whereby the connector body and tube are connected together;

• said jig comprising a sleeve to fit over the tube end portion and having a plurality of dimple forming pins each adapted to be pressed by a pneumatic or hydraulic ram to form the dimples and wherein the jig is formed as a segmented sleeve which is assembled and disassembled around the connector body.

A jig as claimed in 9, wherein the recesses of the jig have flat portions spaced around the circumference of the recess such that when the yoke is fully engaged the yoke is held both longitudinally of the jig and radially thereof but so that when the jaws of the yoke are only partially relieved the yoke may be moved around the jig but not moved longitudinally thereof.

A yoke having jaws for use with the jig and tube connector body of the type for joining oil or gas well tubing string to coil tubing connected to a tube of oil or gas well tubing string for use downhole in oil or gas well operations, the connector body comprising a male/spigott end portion fitted concentrically within a corresponding end of the tube, the end portion having a plurality of depressions or holes preformed to receive and coinciding with localised depressions formed by plastic deformation of the walls of the tube whereby the connector body and tube are connected together;

• in combination with a jig, wherein the tubing is locally depressed into mating engagement with the connector body by mounting of the jig over the tubing, the jig having dimple-forming pins, each adapted to be pressed by pneumatic or hydraulic ram to form the dimples, wherein the jig is formed as a segmented sleeve which is assembled and disassembled around the connector body, wherein the yoke is adapted to mount around the jig with its jaws extending over opposing sides of the jig only partially encircling the jig and has a pneumatic or hydraulic ram to press the dimple forming pins of the jig into the tubing, the yoke being adapted to be moved around the jig to press each circumferentially spaced pin or pins of the jig in turn.