SU1772341A1 - Threaded coupling for pipes - Google Patents

Description

The invention relates to the field of equipment for drilling and operating oil and gas wells, in particular to threaded connections, and can be used in the oil, gas and chemical industries.

A threaded pipe connection is known including pipe ends connected by a sleeve with a sealing ring installed between their ends.

The disadvantage of such a threaded connection is the need for preliminary measurement of the gap value of a particular pair of pipes and low sealing efficiency.

A threaded pipe connection is known, including a sleeve with internal threads, pipe ends with external threads, counter threads of the sleeve and tapered surfaces at the end on their inside and installed between the ends of the pipes (54) THREADED PIPE CONNECTION (57) Use: to increase the tightness of threaded connections when work in the zone of high pressures and temperatures, as well as when exposed to aggressive fluids. The inventive threaded pipe connection is screwed up by means of a coupling, and between the ends of the pipes there is a sealing ring with an annular groove and channels blocked by check valves. The inner surface of the o-ring is made in the form of an ejector. 1 ill.

O-ring with conical sections, mating conical surfaces of the pipes and side surfaces for interaction with the ends of the pipes.

The disadvantage of such a threaded connection is the low sealing efficiency with high parameters and the pumping of aggressive fluids, as well as the need to measure the clearance of a specific pair of pipes.

The purpose of the invention is to increase the tightness of the compounds when working in the zone of high pressures and temperatures, and exposure to aggressive fluids.

Significant differences of the proposed threaded connection are the implementation of the sealing ring in the form of an ejector, tapered sealing surfaces with end profile surfaces, the presence of tapered grooves, as well as the manufacture of sealing

1772341 A1 rings of material with a large coefficient of linear expansion and shape memory.

This goal is achieved by the implementation of the sealing ring of a chemically inert material with ejection channels having conical check valves overlapping them. sections of the sealing ring are made with annular grooves, the ejection channels connecting the cavities of the latter with the internal cavity of the pipes, and the inner surface of the sealing ring is made in the form of an ejector.

The drawing shows a threaded pipe connection.

The threaded pipe connection consists of two ends of the pipes 1, connected by means of a sleeve 2 with a sealing ring 3 installed between them with conical sealing surfaces 4, on which annular grooves 5 are made, end profile surfaces 6, and the inner surface is made in the form of an ejector 7 with check valves 8, 'channels 9. The connection operates as follows. At the ends of the pipes 1 on the inner side previously, grooves 4 are made with a certain taper. An O-ring 3 is installed in the inter-face space.

. When screwing in a radial joint _? The seal is carried out due to the radial deformation of the outer conical sections of the ring 4, and the end seal is due to the axial deformation of the end profile protrusion of the ring 6.

When making up the connection, a certain value of the interference fit on the conical surfaces is set until the ends of the pipe 1 touch with the profile protrusion of the ring 6. With further tightening, pressure increases on the profile surfaces 6 with the deformation of the protrusions. Crumpled, the profile protrusion 6 compensates for the difference between the inter-distances of a particular pair of pipes (which TOT 633-80 are 2.6 mm).

The execution of the inner surface of the ring 3 in the form of an ejector 7 provides a negative depression in the process of passage of the agent in the ejection channels 9 radially located in the body of the ring 3. Due to this, the agent leaked through the conical seal is sucked from the interstitial space, which increases the degree of sealing. To prevent the agent from entering the inter-face space in the initial operating modes of the ejection channel 9, they are provided with check valves 8.

For the manufacture of the sealing ring 3 can be used materials with shape memory. When the operating temperature is reached, concentric protrusions of a given profile are formed on the outer conical sections of the ring and on the end protrusions, which increase the tightness of the connection.

It is possible to make the ring 3 from a material with a linear expansion coefficient greater than the material of the nipple and the coupling, which provides increased tightness of the threaded connection at high operating temperatures.

The economic efficiency of the proposed device results from an increase in the effectiveness of sealing when working in the zone of high pressures and temperatures and exposure to aggressive fluids.

Claims (1)

Claim A threaded pipe connection, including a sleeve with internal threads, pipe ends with bypass threads, mating threads of the sleeve, and tapered surfaces on the pipe inner surface at their end, and a sealing ring installed with the pipe ends to interact with the pipe ends with tapered portions corresponding to the tapered surfaces of pipes, with the fact that, in order to increase the tightness of the connection, the sealing ring is made with ejection channels blocked by check valves and, the conical sections of the sealing ring are made with annular grooves, and ejection channels connect the cavities of the latter with the internal cavity of the pipes, the inner surface of the sealing ring being made in the form of an ejector.