SU1819973A1 - Joining of pipes for deep drilling - Google Patents

Description

The invention relates to drilling equipment and may find application for exploration in drilling mainly deep oil wells.

The aim of the invention is to increase reliability and reduce the size of the connection of drill pipes.

In FIG. 1 is a longitudinal sectional view of a drill pipe joint; in FIG. 2, section A-B-B-D in FIG. G.

The ends of the upper 1 and lower 2 pipes have a cylindrical thickening of 3 and 4, respectively, with a diameter greater than the diameter of the pipe, made with a step at a right angle to the surface of the pipe. , At the ends of the pipes, self-centering cams 5 and 6 (mating protrusions and cuts) are provided for transmitting torque when drilling a well. On the thickening of each pipe, grooves 7 and 8 are made, into which, when assembling the joint, a sealing gasket 9. is made, for example, made of rubber. On the thickenings 3 and 4, equal in thickness to the double thickness of the walls of the pipes 1 and 2 and inserted into each other, is put on mating along the longitudinal plane on the guide pins 10, consisting of two halves 11 and 12 and having an inner cylindrical recess coupling, covering the thickening of the pipes, the ends of which are equipped with tapered threads. The upper 13 and lower 14 nuts having left and right threads respectively are screwed onto the ends of the assembled coupling 11 and 12.

Assembly of the connection of drill pipes is as follows.

First, the lower 14 is put on the lower pipe 2, and then the upper 13 nuts, the annular rubber gasket 9 is put on the thickening 4, then the upper pipe 1 is installed on the lower pipe 2 so that the cams 5 and 6 fit into the corresponding cutouts, the gasket 9 is laid in the annular the groove formed by the grooves 7 and 8, the nut 13 rises above the upper

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1819973 A1 thickening 3. and on the thickening of the assembled pipes are put on the coupling halves 11 and 12. mating on the pins 10. The coupling halves are pressed against each other and the nuts 13 and 14 are screwed on them to the required torque.

The connection is disassembled in the reverse order: the nuts 13 and 14 are unscrewed, the coupling halves 11 and 12 are opened, the pipe 1 rises, the sealing ring 9 is removed and the nuts 13 and 14 are removed.

The connection works as follows.

Rotate the upper pipe 1 clockwise, the torque to the lower pipe 2 is transmitted by means of self-centering fists 5 and 6, and the weight of the column from the pipe 2 to the pipe 1 is transmitted through the machines and the annular ledge of the cylindrical recess of the coupling halves 11 and 12, withstanding tensile forces due to its thickness and the length of the step of the clutch, working on a slice. The rigidity of the connection is provided by the length of the thickenings 3 and 4 of the pipes 1 and 2 and the length of the coupling halves 11 and 12, which should be at least 3.5 ... 4 pipe diameters.

The advantages of the proposed connection of drill pipes in comparison with the prototype are, firstly, that the transmission of torque from the pipe to the pipe is transmitted practically without affecting the coupling, and secondly, the coupling experiences only tensile and shearing forces from the weight of the string, therefore it Strength is ensured by the wall thickness of the coupling, and the strength from the shear force is provided by the length of the thickening of the coupling half, not exceeding / the length of the thickening of the pipe, and the thickness is double the wall thickness. This design provides the small overall dimensions of the entire connection and can be calculated for drilling the deepest wells themselves.

Claims (4)

Claim 1. The connection of pipes for deep drilling, including the end sections of the pipes with end cams and thickenings, mounted on the outer surfaces of the end sections of the pipes to be connected, a sleeve containing two elements mating along the longitudinal plane and their fixing unit, characterized in that, in order to increase reliability, the outer surface of the thickening and the coupling surface mating to it are made in the form of cylindrical surfaces forming rectangular ledges with the pipe body and the coupling; the upper and lower parts of the coupling are threaded ends, and fixing the assembly - in the form of nuts mounted on the latter, the upper thread is left, and bottom - right direction. 2. The connection according to claim 1, with the exception that the coupling elements have guide pins and holes for their placement. _g 3. The compound according to claims 1 and 2, which is related to that. that it is equipped with a sealing gasket, and a groove is made on the outer surface of the bulges to accommodate the latter. 4. The pipe connection according to claims 1 to 3, characterized in that the length of the coupling is 3.5-4.0 pipe diameters. fig j Figure 2