RU2789726C1 - Fastening flange connection via studs with segment elements - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mining, in particular to oil and gas extraction, and may be used during well workover operations in order to fix various wellhead equipment on a support flange of a well, as well as to fix the wellhead flange during well operation. Fastening flange connection via studs with segment elements contains supporting and wellhead flanges, metal sealing ring installed between them in grooves with cone-shaped surfaces, holes in the supporting and wellhead flanges for fastening under stud bolts with nuts, a number of nuts is designed in the form of segment elements rigidly connected to stud bolts with the help of thread connection, segment elements of stud bolts with their lower ends throughout the contact area with flange. The segment elements rigidly connected to the stud bolts via threaded connection are secured with retaining screws. One end of the segment elements is provided with grooves, while the opposite ends are provided with studs. The segment element stud is designed to engage with the slot of the subsequent segment element, and the slot of the segment element is designed to engage with the slot of the preceding segment element. The studs segment elements are designed to form a gap between the segment elements ends.

EFFECT: invention provides for increasing reliability, reducing labour intensity and time required for assemblying/disassemblying the flange connection via studs with segment elements, and also reducing metal consumption.

1 cl, 5 dwg

Description

The invention relates to the field of mining, in particular to the oil and gas industry, and can be used in the repair of wells in order to mount various wellhead equipment on the well support flange, as well as to fasten the wellhead flange during well operation.

It is known to mount a flanged connection at the wellhead (patent RU No. 2763154, IPC E21V 33/03, publ. 12/27/2021), containing a reference and wellhead flanges with holes for fastening, a sealing ring installed between the flanges in grooves with tapered surfaces, studs, nuts. The support and wellhead flanges are made with six holes for fastening, six studs are made with lateral blind holes, six segment elements with lateral threaded holes are placed at the end of the studs, while the segment elements are screwed onto the studs and rigidly fixed with screws screwed into the lateral threaded holes segment elements until it stops at the ends of the side blind holes, while in the side threaded holes of the segment elements above the screwed screws, internal annular grooves are made into which split spring retaining rings are inserted, fixing the screws in the side threaded holes of the segment elements from spontaneous lapel, and the studs with segment elements and nuts are made of a material of strength class 12.8 with a thread pitch of 2.5-4 mm, while the studs with segment elements are inserted from below into the holes for fastening the reference and wellhead flanges and form a ring in contact with the reference flange, and the nuts on the studs are turned from above.

Device disadvantages:

- firstly, the laboriousness and duration of the installation of the fastening of the flange connection with studs with segment elements. This is due to the fact that in order to prevent rotation of the studs with segment elements relative to each other, the ends of the segment studs are in close contact with each other. This makes it difficult to install studs with segment elements into the holes of the base and wellhead flanges, therefore, it is necessary to align the studs with segment elements relative to the flange holes mechanically using a hammer;

- secondly, low reliability of operation, due to insufficient tightness of the fastening of the flange connection at pressures above 20.0 MPa. This is due to the fact that each segment element of the stud exerts a selective load on the sealing ring located between the base and wellhead flanges, as the tightening forces of the nuts on the studs with a wrench on each stud are different, therefore, in one section of the interconnected base and wellhead flanges, the sealing the ring is tightened, and on the other part of the flanges it is not tight;

- thirdly, high metal consumption, due to the fact that the assembled segment elements in the cross section represent a metal ring.

The closest in technical essence and the achieved result is a device for fastening a flange connection with studs with segment elements (patent RU No. 2760446, IPC E21 B 33/038, publ. surfaces a metal sealing ring, in the base and wellhead flanges there are holes for fastening for studs with nuts. The lower row of nuts is made in the form of segment elements rigidly connected to the studs by means of a threaded connection and flaring of the lower end of the stud, while the segment heads of the studs contact the support flange with their lower ends over their entire area, and the studs and nuts have a large thread pitch.

Device disadvantages:

- firstly, low reliability of operation, due to insufficient tightness of the fastening of the flange connection at pressures above 20.0 MPa. This is due to the fact that each segment element of the stud exerts a selective load on the sealing ring located between the base and wellhead flanges, since the tightening force of the nuts on the studs with a wrench on each stud is different, therefore, in one section of the interconnected base and wellhead flanges, the sealing the ring is tightened, and on the other part of the flanges it is not tight;

- secondly, the complexity and duration of the installation (dismantling) of the fastening of the flange connection with studs with segment elements. This is due to the fact that in order to prevent rotation of the studs with segment elements relative to each other, the ends of the segment studs are in close contact with each other. This makes it difficult to install studs with segment elements into the holes of the base and wellhead flanges, so it is necessary to align the studs with segment elements relative to the flange holes mechanically using a hammer;

- thirdly, high metal consumption, due to the fact that the assembled segment elements in the cross section represent a metal ring.

The technical objectives of the invention are to increase reliability, reduce the complexity and duration of installation (dismantling) of fastening the flange connection with studs with segment elements, as well as reducing the metal consumption of the device.

The set technical problems are solved by fastening the flange connection with studs with segment elements, containing a base and wellhead flanges, a metal sealing ring installed between them in grooves with conical surfaces, holes in the base and wellhead flanges for fastening under studs with nuts, a number of nuts are made in the form of segment elements , rigidly connected to the studs by means of a threaded connection, the segment elements of the studs with their lower ends are in contact with the flange over their entire area, and the studs and nuts have a large thread pitch.

What is new is that the segment elements, rigidly connected to the studs by means of a threaded connection, are fixed with locking screws, and the segment elements are equipped with grooves at one end, and spikes are made at the opposite ends of the segment elements, while the spike of the segment element is made with the possibility of interacting with the groove of the next segment element, and the groove of the segment element is configured to interact with the stud of the previous segment element, and the segment elements of the studs are configured to form a gap between the ends of the segment elements.

In FIG. 1 schematically shows the fastening of a flange connection with studs with segment elements.

In FIG. 2 schematically shows view A of fastening a flange connection with studs with segment elements.

In FIG. 3 schematically shows a section B-B of fastening a flange connection with studs with segment elements.

In FIG. 4 schematically shows view B of fastening a flange connection with studs with segment elements.

In FIG. 5 schematically shows view C of fastening a flange connection with studs with segment elements.

A device for fastening a flange connection with studs with segment elements contains a support 1 (see Fig. 1, 3, 5) and wellhead flanges 2 (see Fig. 1, 2, 3), a metal sealing ring installed between them in grooves with tapered surfaces 3 (see Fig. 1).

The outer diameters of the reference 1 and wellhead 2 flanges are equal to each other and are, for example, Df=380 mm.

In the reference 1 and mouth 2 flanges on the center-to-center diameter - D _MC , for example equal to 300 mm holes for studs 4 ¹ (see Fig. 1-5); 4 ² (see Fig. 2, 5); 4 ³ ; 4 ⁴ (see Fig. 1, 2, 5); 4 ⁵ (see Fig. 2, 5); 4 ⁶ , for example, the support 1 and the mouth flange each have six holes with a diameter of 24 mm for six studs: 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ diameter D = 22 mm located at an angle α = 60 ° (see Fig. 2).

A number of nuts, for example the upper one, is made in the form of segment elements: 5 ¹ (see Fig. 1-4); 5 ² (see Fig. 2); 5 ³ ; 5 ⁴ (see Fig. 1-4); 5 ⁵ (see Fig. 2); 5 ⁶ , rigidly connected to the upper ends of the studs 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ using a threaded connection (in Fig. 1 shown conditionally) and locking screws 6 (see Fig. 1), which eliminates the mutual rotation of the segment elements 5 ¹ ; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ relative to pins 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ .

From one end segment elements 5 ¹ ; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ , equipped with grooves 7 ¹ (see Fig. 2, 3, 4); 7 ² (see Fig. 2); ⁷³ ; ⁷⁴ ; ⁷⁵ ; 7 ⁶ , and on the opposite ends of segment elements 5 ¹ ; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ performed spikes 8 ¹ (see Fig. 2, 3, 4); 8 ² (see Fig. 2); ⁸³ ; ⁸⁴ ; ⁸⁵ ; 8 ⁶ .

When fastening the flange connection, the spike 8 ¹ of the segment element 5 ¹ interacts with the groove 7 ² of the subsequent segment element 5 ² .

The groove 7 ¹ of the segment element 5 ¹ interacts with the spike 8 ⁶ of the previous segment element 5 ⁶ .

Segment elements 5 ¹ ; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ pins 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ are performed with a gap - S between the ends of the segment elements 5 ¹ ; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ when fastening the flange connection. Gap s is, for example, 5 mm. Thanks to this gap, the contact of the ends of the segment elements 5 ¹ is excluded; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ among themselves.

Segment elements 5 ¹ ; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ pins 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ lower ends in all their area are in contact with the Ustev flange 2.

On the lower end of the studs 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ when fastening the flange connection, screw on and tighten the nuts 9 ¹ (see Fig. 1, 3, 5); 9 ² (see Fig. 5); ⁹³ ; 9 ⁴ (see Fig. 1, 5); ⁹⁵ ; 9 ⁶ , having a large step of carving equal 2.5.

The device for implementing the method works as follows.

A metal sealing ring 3 is installed in the groove (in Fig. 1 conditionally) with a conical surface of the support flange 1 (see Fig. 1). relative to the support flange 1, their mounting holes are combined.

Further, in the combined holes of the reference 1 and wellhead 2 flanges, studs 4 ¹ are alternately installed from above; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ (see Fig. 1, 4, 5) with segment elements 5 ¹ ; ⁵² ; 5 ³ ; ⁵⁴ ; 5 ⁵ ; 5 ⁶ in the amount of 6 pieces. The ends of the segment elements are assembled according to the "thorn in the groove" principle. Therefore, when fastening the flange connection, the spike 8 ¹ of the segment element 5 ¹ interacts with the groove 7 ² of the subsequent segment element 5 ² . Similarly collect the remaining segment elements: 5 ² and 5 ³ ; 5 ³ and 5 ⁴ ; 5 ⁴ and 5 ⁵ ; ⁵⁵ and ⁵⁶ ; 5 ⁶ and 5 ¹ .

Then the nuts 9 ¹ are stolen from below; ⁹² ; ⁹³ ; ⁹⁴ ; ⁹⁵ ; 9 ⁶ on the corresponding studs 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ and with a wrench (in Fig. 1 - 5 is not shown) tighten the nuts 9 ¹ ; ⁹² ; ⁹³ ; ⁹⁴ ; ⁹⁵ ; 9 ⁶ (see Fig. 1 and 5) on the corresponding studs 4 ¹ ; 4 ² ; 4 ³ ; ⁴⁴ ; 4 ⁵ ; 4 ⁶ .

The reliability of the fastening is increased, since due to the “thorn in the groove” connection, the tightness of the flange connection is increased at a pressure of more than 20.0 MPa. This is due to the fact that when tightening the nuts, each spike located in the groove exerts an additional load through the wellhead flange on the sealing ring, exerting a uniform tightening force around the entire perimeter of the sealing ring.

The labor intensity is reduced and the duration of installation (both assembly and disassembly) of fastening the flange connection with studs to segment elements is reduced by half due to the presence of a gap between the segment elements of the studs, and also due to the fact that the ends of the segment elements are assembled according to the “thorn in the groove” principle.

The metal consumption is reduced, since the -s gap between the segment elements allows saving metal.

Fastening the flange connection with studs with segment elements allows:

- increase the reliability of work;

- to reduce the complexity and duration of installation (dismantling) of the fastening of the flange connection;

- to reduce the intensity of metal fastening.

Claims (1)

Fastening of a flange connection with studs with segment elements, containing a base and wellhead flanges, a metal sealing ring installed between them in grooves with conical surfaces, holes in the base and wellhead flanges for fastening under studs with nuts, a number of nuts are made in the form of segment elements rigidly connected studs using a threaded connection, the segment elements of the studs with their lower ends are in contact with the flange over their entire area, characterized in that the segment elements, rigidly connected to the studs using a threaded connection, are fixed with locking screws, and at one end the segment elements are equipped with grooves, and on spikes are made at opposite ends of the segment elements, while the spike of the segment element is made with the possibility of interacting with the groove of the subsequent segment element, and the groove of the segment element is made with the possibility of interacting with the spike of the previous segment element, and the segment elements w the pills are made with the possibility of forming a gap between the ends of the segment elements.

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