RU2650000C1 - Pipe head - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mining, in particular, to wellhead equipment for well operation. Pipe head includes a body with a stepped axial channel, lateral research channel and collection line, pipe holder, installed in the axial channel of the body, for suspension of the tubing string, cover, sleeve with radial channels, turning assembly. Pipe holder and sleeve are installed in the body so that the collection line of the body, when the sleeve is rotated in a specific manner, is configured to communicate with the longitudinal channel of the pipe holder through the radial channels of the sleeve. Research channel of the body is configured to communicate with well space outside the pipi holder. Under the pipe holder, there are projections or grooves, interacting with the corresponding internal grooves or projections of the body to avoid rotation. Sleeve is installed in the longitudinal channel of the pipe holder to rotate by means of the turning assembly, located above the sleeve and above the cover. Research channel and the collection line are located at one level perpendicular to the axis of the body at an angle along its perimeter, providing communication with channels of the pipe holder, to ensure sequential and alternate or simultaneous opening and hermetical closing to communicate with the longitudinal channel of the sleeve, when the sleeve is rotated.

EFFECT: proposed device provides reduced material costs by simplifying the manufacture of the pipe head, wider operational capabilities due to using both the sucker-rod pumping unit and the progressive cavity sucker-rod pumping unit , its higher reliability by simplifying the structure, reduced number of compounds working under pressure, and reduced metal consumption and overall dimensions.

1 cl, 5 dwg

Description

The invention relates to mining, in particular to wellhead equipment for operating wells.

Known wellhead fittings for installation of SHGN AShK 50 × 14 according to TU 3665-009-49652808-2004 (Product catalog "Equipment for the oil and gas industry" LLC "NGO NGO" TECHNOVEK "), containing a housing with two side outlets equipped with shut-off valves, a conical sub for suspension of pipe string, wellhead stuffing box and bypass valve installed in the sub.

The disadvantages of the known device are the location of the lateral branches of the housing at different levels in height, which with a regulated location of the lower (usually technological) branch relative to the ground level leads to a higher location of the main branch, respectively, of the collection line pipe, and also small (significantly less than the conditional valve passage) cross-section of the bypass valve seat, insufficient during technological operations, in particular flushing of downhole equipment in a closed cycle.

Known wellhead reinforcement (a. From the USSR No. 1352039, IPC EV21/03, publ. 11/15/1987, bull. No. 42), comprising a housing having flow lines located in one horizontal plane with side channels, one of which associated with the annulus, the locking elements and the suspension mounted on the housing with a seal and a central channel, while in order to increase the reliability of the valves during repair work while facilitating installation and dismantling, the suspension seal is installed in a plane inclined to the center axis of the channel, while the side channel associated with the annulus is made under the seal, and the other side channel is connected to the central channel and placed above the seal.

A disadvantage of the known device is the need to equip it with locking devices, due to which the dimensions and weight increase, as well as the reliability of its operation.

Known wellhead reinforcement (RF patent No. 2159842, IPC ЕВВ 33/03, ЕВВ 49/08, ЕВВ 47/00, publ. 11/27/2000, bull. No. 33), comprising a housing with a communication channel with a cavity of tubing and communication channel with annular space, conical coupling for pipe suspension, poppet valve-shutoff, wellhead seal for sealing the polished rod of the deep-well sucker rod pump, while a shut-off valve and a sampler for sampling for analysis throughout the communication channel with the cavity of the tubing are installed cross section in kana e Messages annulus shut off valve is installed, moreover, the housing is provided with an additional channel messages cavity tubing annulus and with a stop valve with a valve mounted in this channel.

Known tube head (RF patent No. 2170328, IPC ЕВВ 33/03, publ. 07/10/2001, bull. No. 19), including a cylindrical body with upper and lower connecting flanges, with stepped axial and radial channels, with two upper and two lower lateral branches having connecting flanges for installing the main valves, a pipe holder installed in the axial channel of the housing for suspension of the lift column, a pipe holder mount in the axial channel of the housing located in the axial channel of the housing above the pipe holder with a through and a blind central axial channels, the axes of which are mutually perpendicular, as well as with upper and lower saddles, a ball locking control unit in the form of a rotary shaft mounted in a radial channel of the housing, whose axis is perpendicular to the axes of a through and a blind central axial channels in a ball locking body and passes through the point of their intersection, the adapter flange with a stepped axial channel located on the housing, as well as the figured sleeve installed in it and in the axial channel of the housing, with aporny body is formed with an additional hollow central axial channel, and the housing - with an additional upper sidearm, the axes of which are coaxial with the rotary axis of the shaft, wherein the brace sleeve rigidly connected with the housing, and the upper seat is housed inside the sleeve shaped.

The disadvantages of the known devices are the presence in each of them of at least three locking devices, which leads to an increase in size, especially radial, and weight, to a decrease in the reliability of the devices, as well as the complexity of manufacturing and repair of the case.

Known tube head (a. With. The USSR No. 1514904, IPC ЕВВ 33/03, publ. 10/15/1989, bull. No. 38), comprising a cylindrical body with concentric tube holder and its fixing unit in the form of locking bolts, installed in the pipe holder has a locking mechanism in the form of a glass with a locking assembly and an actuator for controlling the locking mechanism, while in order to increase the reliability of the pipe head, reduce the duration and increase the safety of installation work at the mouth when dismantled blowout control equipment is equipped with a piece located concentrically in the pipe holder and made in the upper part with an annular external protrusion and a bore on its inner surface, the sleeve being rigidly connected with its lower part to the pipe holder, and the glass has an annular internal protrusion in the lower part to accommodate the external protrusion of the sleeve, this glass is mounted with the possibility of rotation around the sleeve. However, the known device has the following disadvantages:

- firstly, the branches of the fountain fittings, obtained on the basis of the known device, for directing the flow of the borehole medium are located above the shutoff assembly, which increases the height and metal consumption of the fountain fittings;

- secondly, the device is not intended for the equipment of the wellhead operated by the borehole sucker rod pump (USHN), sucker rod pump (USHVN), etc., due to the location of the rod string inside the shutter assembly;

- thirdly, the need to manufacture a channel in the housing for the drive of the locking mechanism and its sealing, working under operating pressure;

- fourthly, the use of the known device does not exclude the need to equip the fountain valves with locking devices.

The closest in technical essence is the pipe head (RF patent No. 2117749, IPC ЕВВ 33/03, publ. 08.20.1998, bull. No. 23), including a cylindrical body with connecting flanges, with stepped axial and radial channels, as well as with side bends located below the latter, a pipe holder installed in the axial channel of the housing for suspension of the elevator column, a ball locking element located in the pipe holder with a through axial channel and saddles, a ball locking control unit in the form of a rotary shaft, the axis of which perpendicular to the axis of its through axial channel, and the sealing cover, a sleeve with two radial channels, one of which serves to accommodate the rotary shaft, and the holder of the pipe holder in the housing in the form of locking bolts installed in the radial channels of the housing and having the ability to interact with the pipe holder, moreover, it is equipped with fixing elements in the form of fingers installed in the lower part of the body, side branches of the body are placed at different levels in height, and the sleeve concentrically outside the pipe spruce, while the spherical locking element is made with a blind axial channel perpendicular to the through axial channel in it and the axis of the rotary shaft, the pipe holder with an external annular protrusion, with an axial groove and curly grooves on its outer surface and two radial channels, one of which serves to accommodate the rotary shaft, the housing - with a radial channel for accommodating the rotary shaft, and the pipe holder and the sleeve are installed in the housing so that their radial channels for accommodating the rotary shaft are coaxial, and the axis is upper about the lateral branch of the housing coincides with the axes of the other radial channels of the sleeve and the pipe holder, while they are located in the same plane as the axes of the through and the blind channels of the ball locking element, and the lower side branch of the housing coincides with the axial groove of the pipe holder, and the fingers are mounted to interact with it shaped grooves, while the sleeve is placed so that its lower end it interacts with a stepped axial channel of the housing, and the upper one with the outer annular protrusion of the pipe holder.

The disadvantages of the known solutions are:

- firstly, the location of the lateral branches of the housing at different levels in height, which with a regulated location of the lower (usually technological) branch relative to the ground level leads to a higher location of the main branch, respectively, of the collection line pipeline;

- secondly, the device is not intended for the equipment of the wellhead operated by USHN, USHVN, etc., due to the location of the rod string inside the shutoff member;

- thirdly, the difficulty of connecting the rotary shaft with the locking body due to the need for simultaneous coaxial location of the groove of the locking body, the radial channels of the housing, the sleeve and the holder;

- fourthly, the need to manufacture a channel in the housing for the rotary shaft and its seal, working under operating pressure;

- fifthly, the need to manufacture a spherical locking element on special machines or using devices, which affects the cost of the tube head.

The technical objectives of the invention are to reduce material costs by simplifying the manufacture of the tube head, expanding operational capabilities, increasing its reliability by simplifying the design, reducing the number of joints working under pressure, while reducing metal consumption and overall dimensions.

The stated technical problems are solved by a tube head including a housing with a stepped axial channel, a lateral research channel and a collection line, a pipe holder installed in the axial channel of the housing for suspension of the lift column, a cover, a sleeve with radial channels, a rotation unit, and the pipe holder and sleeve are installed in the housing so that the collection line of the housing at a certain rotation of the sleeve is configured to communicate through the radial channels of the sleeve with the longitudinal channel of the pipe holder, and the research to the housing anal is made with the possibility of communication with the borehole space outside the pipe holder, and protrusions or grooves are made below the pipe holder, interacting with the corresponding internal grooves or body protrusions to prevent rotation.

What is new is that the sleeve is mounted in the longitudinal channel of the pipe holder with the possibility of rotation using a turning unit located on top of the sleeve and above the cover, and the research channel and the collection line are placed at the same level perpendicular to the axis of the housing at an angle around its perimeter, allowing communication with the channels the pipe holder so that when the sleeve is rotated, the channels are sequentially and alternately or together open and tightly closed to communicate with the longitudinal channel of the sleeve.

In FIG. 1 schematically shows a pipe head (front view); in FIG. 2 is a section AA in FIG. 1 when performing pressure relief in the tube head; in FIG. 3 is a section AA in FIG. 1 in the working position of the tube head; in FIG. 4 is a section AA in FIG. 1 when the collection line is blocked in the pipe head; in FIG. 5 is a section BB of FIG. one.

The tube head includes a housing 1 (Fig. 1) with a stepped axial channel 2, a lateral research channel 3 and a collection line 4 (Fig. 2-4), a pipe holder 5 (Fig. 1) installed in the axial channel 2 of the housing 1, for suspension elevator columns 6, cover 7, sleeve 8 with radial channels 9 (FIGS. 2-4) and 10, a rotation unit, which can be made as shown in FIG. 1, in the form of flats 11 on sleeve 8 for standard wrenches, or holes on sleeve 8 with a handle or other rotary device (not shown in the figures). The pipe holder 5 and the sleeve 8 are installed in the housing 1 hermetically so that the collection line 4 (Fig. 2-4) of the housing 1 with a certain rotation of the sleeve 8 is made with the possibility of communication through radial channels 9 and 10 of the sleeve 8 with the longitudinal channel 12 (Fig. 1 ) the pipe holder 5, and the research channel 3 of the housing 1 is configured to communicate with the borehole space 13 outside of the pipe holder 5. Bottom of the pipe holder 5 (Fig. 5) made protrusions or grooves 14, interacting with the corresponding internal grooves or protrusions 15 of the housing 1 to exclude ota. The cover 7 (FIG. 1) can be attached to the housing 1 either by thread, as shown in FIG. 1, either using a flange connection (not shown in the figures), or any other connection that allows you to fix the pipe holder 5 from its exit from the housing 1.

The sleeve 8 is installed hermetically in the longitudinal channel 12 of the pipe holder 5 with the possibility of rotation using a pivot 11 located on top of the sleeve 8 and above the cover 7. The longitudinal channel 12 of the pipe holder 5 can be made stepwise, as in FIG. 1, to accommodate the sleeve 8 or stepless. If necessary, the sleeve 8 is fixed relative to the pipe holder 5 from axial movement, for example, with a nut 16, a locking ring or other retainer (not shown in the figures).

The sealing of the sleeve 8 in the pipe holder 5 and the pipe holder 5 in the housing 1 can be carried out, for example, as shown in FIG. 1, with O-rings 17, 18 and 19 (Fig. 2), 20 and 21, or by ensuring minimal gaps in the mates of the parts to be sealed and forcing the mating grease into the mates, or in another way (not shown in the figures).

The research channel 3 (Fig. 2-4) and the collection line 4 are placed at the same level perpendicular to the axis 22 (Fig. 1) of the housing 1 at an angle α (Fig. 2-4) around its perimeter, allowing communication with channels 23 and 24 of the tube holder 5 so that when turning the sleeve 8, the channels 23 and 24 open sequentially and alternately or together and tightly closed for communication with the longitudinal channel 25 of the sleeve 8. The angle α, depending on the diameters of the sleeve 8 and the pipe holder 5, the sizes of the channels 23, 24 of the pipe holder 5 and 9, 10 of the sleeve 8, the type and size of the seal of the sleeve 8, for example rings 19 and 20, is determined constructively.

The operation of the device is as follows.

A casing 1 (Fig. 1) of a pipe head is installed on a production casing of a well or a casing head (not shown in the figures), for example, by means of a threaded or flange or other connection. Accordingly, on the housing 1, a nipple thread should be made in case of connecting to the production casing coupling, or a counter flange when connecting to a column flange, or another mating part of the connection.

After lowering the pipe string 6 with downhole equipment (not shown in the figures) to the required depth, the pipe holder 5 is attached to the upper part of the column 6 using a thread 26 together with a sleeve 8 fixed on the pipe holder 5, for example, using a nut 16. The column 6 is suspended on the pipe holder 5 in the upper annular extension of the stepped axial channel 2 of the housing 1, while the grooves 14 (Fig. 5) of the pipe holder 5 must be aligned with the protrusions 15 of the housing 1 in order to orient the channel 23 (Fig. 2-4) of the pipe holder 5 towards whom channel 3.

The assembly of the pipe holder 5 (Fig. 1) with a sleeve 8, fixed on the pipe holder 5 with a nut 16, with o-rings 17 and 18 and 19-21 (Fig. 2) when used, is carried out at the factory with hydraulic tests of the assembled unit, which eliminates the need for assembly during installation at the well.

If necessary, other downhole equipment is lowered into the pipe string 6 (Fig. 1), for example, a rod string with a rod pump or a screw pump or other equipment (not shown in the figures).

A wellhead stuffing box is attached to the upper part of the tube head, for example, to thread 27, when operating the USHN, or the USHVN drive, or other equipment (not shown in the figures).

Since the research channel 3 in the working position of the sleeve 8 is constantly in communication with the annular space 13, it is assumed that the proposed device at the outlet of the channel 3 is equipped with a locking device, for example, an angle valve, crane or other (not shown in the figures). Collection line 4 is connected to the pipeline of the product collection system (not shown in the figures).

After turning on the installation for producing a borehole medium, for example, USHN, the produced borehole medium (solid arrows (Fig. 3) from the pipe string 6 (Fig. 1) through the longitudinal channel 12 of the pipe holder 5, the longitudinal channel 25 and channel 10 (Fig. 3) of the sleeve 8, channel 24 of the pipe holder 5 and the collection line 4 of the housing 1 enters the ground pipe of the product collection system (not shown in the figures) Channel 24 of the pipe holder 5, channel 10 of the sleeve 8 and the collection line 4 of the housing 1 are communicated - this is the working position of the sleeve 8.

When carrying out technological operations, for example, when it is necessary to relieve pressure in the pipe head, flushing the well and other operations, the sleeve 8 (Fig. 1) is turned by turning using the turning unit 11 to the position as shown in Fig. 1. 2, in which the collection line 4 and the borehole space 13 (Fig. 1) communicate through the channel 24 (Fig. 2) of the pipe holder 5, channels 9, 25, 10 of the sleeve 8, channel 23 of the pipe holder 5 and channel 28, which allows pressure relief ( solid arrows) inside the tube head into the borehole space 13 (Fig. 1) or create a circulation during flushing.

For tight overlapping of the collection line 4 (Fig. 4), the sleeve 8 is rotated using the rotation unit 11 (Fig. 1) to the position in which the well products do not enter the collection line 4 (Fig. 4) or products located in the system pipeline product collection (not shown in the figures), respectively, and in the collection line 4, does not enter the longitudinal channel 25 of the sleeve 8 and further into the well.

The proposed technical solution makes it possible to dispense with one locking device instead of three, as with typical valves for USHN in PJSC TATNEFT AU 140 × 50, due to the use of a rotary sleeve 8, which functions as two locking devices. This eliminates two outlets, respectively, the need to manufacture holes and parts for tying outlets (nozzles, quick couplings, elbows, etc.) and flange joints, metal is used more rationally in the construction of parts, which can significantly reduce the metal consumption of valves (up to 65%) compared with the AC 140 × 50.

All details of the tube head are cylindrical in shape, which allows them to be manufactured by turning with a minimum amount of milling work.

The above allows to reduce the cost of reinforcement in the end by about 30%.

The location of the lateral branch pipes of the housing at the same height level allows to reduce the height of the wellhead stuffing box at the wellhead compared to the analogue AShK 50 × 14 by approximately 170 mm, respectively, the height of the valve decreases by this value, which, along with facilitating maintenance of the wellhead valve, leads to a significant reduction the cost of installing the USHN drive by reducing the dump height under the drive plate.

In the proposed device, it is possible to constructively achieve the equality of the cross sections of the technological channels 3, 23 (Fig. 2-4) and 28, allowing with minimal hydraulic losses to flush the downhole equipment in a closed cycle, which is almost impossible to implement in the analogue of AShK 50 × 14, due to this is expanding operational capabilities.

The exclusion of holes and connections in the pipe head operating under pressure reduces the likelihood of failure of the wellhead as a whole, therefore, the reliability of its operation will increase.

Thanks to the use of the proposed device, material costs are reduced due to the simplification of the manufacture of the tube head, the operational capabilities are expanded due to the use of both USSHN and UVSHN, its reliability is increased due to the simplification of the design, reduction in the number of joints working under pressure, while reducing metal consumption and overall dimensions.

Claims (1)

A tube head including a housing with a stepped axial channel, a lateral research channel and a collection line, a pipe holder installed in the axial channel of the housing for suspension of the lift column, a cover, a sleeve with radial channels, a rotation unit, and the pipe holder and sleeve are installed in the housing so that the case collection line for a certain rotation of the sleeve is made with the possibility of communication through the radial channels of the sleeve with the longitudinal channel of the pipe holder, and the research channel of the case is made with with a borehole space outside of the pipe holder, and projections or grooves are made below the pipe holder, interacting with the corresponding internal grooves or body protrusions to prevent rotation, characterized in that the sleeve is mounted in the longitudinal channel of the pipe holder with the possibility of rotation using a rotation unit located above the sleeve and above lids, and the research channel and the collection line are placed at the same level perpendicular to the axis of the housing at an angle around its perimeter, allowing for communication with the channels of the pipe holder so that when the sleeve is rotated, the channels are sequentially and alternately or together opened and hermetically closed for communication with the longitudinal channel of the sleeve.

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