RU2666384C1 - Universal inter-nipple insert of tubing - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to the mining industry and is intended for use in oil and gas production. Device includes the outer and inner halves, interconnected by twisting through the presence of threaded elements. Contact point at the end of the inter-nipple insert and the rounded end of the nipple of the tubing at the ends of the insert is made with sealing nodes in the form of grooves-recesses with a radius less than the radius of the end curvature on the nipple of the tubing. Threaded connection on the inner surface of the outer half of the insert is made in the form of three threaded sections having the same dimensions and spaced from each other at an equal distance.

EFFECT: excludes the possibility of eddies (turbulence) formation of the produced fluid flow, while the corrosion-erosive rinse – wear of the metal of the inner surface of the tubing decreases.

1 cl, 3 dwg

Description

Technical field

The invention relates to the mining industry and is intended to remove turbulence in the pumped fluid flow, to cut off the inter-nipple space and the inner surface of the coupling of tubing from the flow of corrosive fluid and to prevent depressurization of the threaded part of the coupling-tubing connection, to increase MTBF with increased corrosion and erosion aggressiveness and submersible electric centrifugal, diaphragm pumps, gas lift method of operating wells.

State of the art

A search for prototypes in the current state of the art for creating inter-nipple inserts revealed the presence of a prototype: Majorpack streamer. Trento Italy.

Majorpack's inter-nipple insert (streamer) is made of plastic and consists of two halves of the external and internal. This tape drive is designed to protect the threads of the tubing and the inter-coupling space of the coupling from corrosion and flushing in the area of the tubing coupling. The streamer fills the free space between the ends of the pipes, preventing the possibility of the formation of eddies (turbulence) in the flow of produced fluid. When screwing up the tubing, the rotational movement from the ends of the tubing is transmitted to the halves of the inter-nipple insert, providing twisting to the size required in this connection. Two halves of the streamer, connected by means of a fine four-thread, are twisted along the threads. On the inner surface of the outer half of the streamer, the thread consists of two threaded sections (point-to-point fragmentary thread) having the same dimensions and located opposite each other. The design flaw is: 1) the absence of sealing nodes at the spot of contact between the streamer and the tubing body (a flat surface of the end part of the plastic of the streamer adjacent to the rounded surface of the end part of the body of the tubing, and since the streamer is made of hard plastic, reliable cutting off of the fluid flow in the contact spot is not it is ensured, which leads to fluid overflows into the space between the streamer and the tubing sleeve, the formation of corrosive sections, the loss of metal of the “mesa corrosion” type; 2) the use of two threaded sections (two-point fragmentary thread) leads to distortions and wedging of the thread, the destruction of the product.

SUMMARY OF THE INVENTION

In field practice, it has long been observed that the largest number of tubing failures due to pipe leakage is due to the depressurization of the threaded part of the tubing and through flushing on the groove in the middle of the tubing couplings. Most accidents are also related to this fact.

This device is designed to protect threaded connections of tubing and tubing and the internal cavity of the interunit space of the coupler through the use of a unified staple that provides filling of the interno-pin space, aligning the inner diameters of the tubing and inside the tubing sleeve, as well as providing reliable cut-off of fluid flows into the space between the inter-nipple insert and the tubing sleeve. The inter-nipple insert consists of two parts in the form of rings and is made of heat and chemically resistant plastic. The halves of the inter-nipple insert are twisted by means of a fine three-way thread. On the inner surface of the outer half of the insert, the thread is made in the form of three threaded sections having the same dimensions and spaced from each other at an equal distance (three-point fragmentary threaded connection). What ensures the twisting of the two halves of the inter-nipple insert without distortions and wedging. The design of the end parts of the inter-nipple insert is a sealing nodes in the form of grooves-recesses. When screwing up the tubing, the rotational movement from the ends of the tubing is transmitted to the halves of the inter-nipple insert, providing twisting of the two halves of the insert to the size required in this connection. At the contact spot of the sealing assembly, a groove fits the rounded end of the tubing nipple, providing reliable cut-off of the inter-pinion space of the tubing sleeve from fluid flows without damaging the internal anticorrosive coating of the end face and body of the tubing, eliminating the possibility of formation of vortices (turbulence) of the produced fluid flow. Due to the adjoining of two rounded surfaces to each other, unification of the connecting surfaces and reliable cutting off of the movement of fluid flows into the space between the inter-nipple insert and the tubing sleeve are achieved.

This eliminates the possibility of the formation of vortices (turbulence) in the fluid flow, fluid flows at the points of contact between the insert and the ends of the tubing, the threads of the tubing, the end parts of the tubing nipples are protected, and the corrosion-erosion flushing of the inner inter-pin space of the tubing sleeve is prevented.

On the basis of which we can assume that the presented work has an inventive step.

Brief Description of the Drawings

In FIG. 1 is a sketch of the inner half of an internipple insert. The following details are numbered:

1. Three-way thread around the circumference.

2. A sealing assembly at the end of the inner half of the inter-nipple insert (the radius is less than the radius of rounding of the end on the tubing nipple).

In FIG. Figure 2 shows a sketch of the outer half of the inter-nipple insert. The following details are numbered:

3. Three-way fragmentary thread. The thread is not made around the entire circumference, fragments of thread are in three sections and are located evenly around the circumference.

4. A sealing assembly at the end of the outer half of the inter-nipple insert (the radius is less than the radius of rounding of the end on the tubing nipple).

In FIG. Figure 3 shows a sketch of an inter-nipple insert directly in the inter-nipple space of the tubing, in its working position. The following details are numbered:

5. Inoperative tubing connection.

6. The nipple part of the working connection of the tubing.

7. Butt tubing.

8. The tubing coupling.

9. The outer half of the inter-nipple insert. 10. The inner half of the inter-nipple insert.

Information confirming the possibility of carrying out the invention:

Description of the device before installation.

часть одного витка резьбы формируя единое изделие. Описание устройства при монтаже в муфту НКТ.The device consists of two parts in the form of rings. The halves of the inter-nipple insert are twisted on

part of one thread thread forming a single product. Description of the device during installation in the tubing coupling.

The inter-nipple insert is installed in the inner cavity of the coupling connection 8, while the internal diameters d1 and d2 are equalized, which prevents the formation of turbulence in the flow of the pumped fluid. The further course of action does not differ in any way from the requirements for the application and operation of tubing of oil and gas companies, in accordance with GOST 633-80, GOST R 52203-2004. The nipple part of the tubing 6 is screwed into the coupling connection 8. When making up, the end of the nipple part of the tubing 6 abuts against the end of the inner half 10 and transmits torque to it, which allows the inner half of the insert to move relative to the outer half of the insert 9 along a three-point fragmentary threaded connection.

The device’s operability is based on the fact that the sealing nodes in the form of grooves-recesses on the ends of the inter-nipple insert provide a reliable fit to the rounded ends of the tubing body, and a three-point fragmentary threaded connection ensures twisting of two halves of the inter-nipple insert without distortions and wedging

Claims (1)

A device for protecting threaded connections of tubing and tubing and the internal inter-nipple space of the tubing sleeve is a unified inter-insert, consisting of external and internal halves interconnected by twisting by means of threaded elements, characterized in that the contact point on the end face of the inter-nipple insert and the rounded end of the tubing nipple at the ends of the insert is made with sealing units in the form of grooves-notches with a radius less than the radius of rounding of the end on the tubing nipple, and threaded with The connection on the inner surface of the outer half of the insert is made in the form of three threaded sections having the same dimensions and spaced from each other at an equal distance.

Images