Throttle with automatic cleaning of throttling channel

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil industry and can be used for operation of flowing gas and oil wells. This device consists of the case fitted in discharge pipe axial channel while male adapter with lengthwise grooves and needle holder is fitted in said case. Case opposite side is equipped with barrel provided with circular ledges to make a circular chamber with said case. Said chamber accommodates spring-loaded circular piston with end valve resting on seat at circular ledge end face. Circular piston and end valve make with the case the circular chamber communicated hydraulically via several bores in the case body with circular channel between said case and discharge pipe. Pusher is arranged inside circular chamber to rest on circular piston and equipped with holder with nozzle pressed by the nut to make a sliding joint with needle holder. Barrel body has radial bores for connection of circular chamber under circular piston with the barrel axial channel overlapped at initial position of end valve body. Said barrel is equipped with adjusting nut for spring hold down. Circular chamber between said barrel and pusher is communicated by drain bore with barrel axial channel.

EFFECT: lower hydraulic drag, higher reliability of structure.

2 dwg

 

The invention relates to the mining industry, in particular to estuarine regulating devices for the operation of the gushing oil and gas wells.

Known design flow-adjustable fitting (see the "Handbook for gas-lift method of operating wells Yevseyev, Raamatu, Avicennae and others - M.: Nedra", 1984 GS-116).

The device consists of a hollow body, in the axial channel which is placed Suzirya nozzle tip on the bottom of the hollow piston mounted asymmetrically nozzle, which in turn is connected through a ball and engages with a nut on the outer side of the hollow body.

By moving the tip to change the cross-sectional area of the channel of the nozzle, which leads to a change in the flow rate of formation fluids.

However, when the ability to change the flow rate due to the reciprocating movement of the tip cannot be implemented in the automatic mode cleaning throttling channel from the sediments and the presence of solids.

Known valve device (see A.S. No. 1440574, M CL E21B 34/06, publ. 30.11.88,, bull. No. 44).

The device consists of a cylindrical body with a receiving and discharge chambers communicating with each other through an axial channel, which has a stepped sleeve. In the body of the stepped sleeve a radial hole is ment, supplied by nozzles. Asymmetrically mounted choke, axial channel which entered the terminal, equipped with a hydraulic actuator in the form of a spring-loaded sleeve with lock. On the outside of the sleeve is installed stepped sleeve to form between them a chamber, hydraulically connected with the discharge chamber. Stepped sleeve provided with a spring-loaded valve with lock.

In case of change of pressure drop across the nozzle, for example plugging by solids or deposits of gas hydrates, is the impact of the excess of the design pressure drop across the cross-section of the sleeve. This leads to her being moved to the side of the discharge chamber and the impact on the spool, which compresses the spring, with the removal of it from the clamp, which leads to the formation of hydraulic connection inlet chamber with the outlet through the radial holes in the body of the stepped sleeve. Simultaneously with the movement of the sleeve with which is connected a rod, the latter is introduced into the axial channel of the throttle with the impact on the layer of solids or gas hydrates with their destruction and removal. When this occurs, the alignment of the pressure drop prior to the settlement, and the effort is pre-compressed spring rod returns to its original position with the continuation of the process of production of formation fluids through the axial channel of the throttle.

The disadvantages of the design, the functions can be attributed to its complexity and inability to carry out the setting to set the process mode of operation:

- the complexity of installation of the device in the axial channel of the housing, due to the need for screwing into the thread of the stepped sleeve.

The famous design of the valve device to control the operation of oil and gas wells (see A.S. No. 1624130, M CL E21B 34/16, publ. 30.01.91,, bull. No. 4). The device consists of a housing with a receiving and discharge chambers which are interconnected through the axial channel of the throttle. To clean its axial channel has a pivot drive.

The device is equipped with the glass installed in the upper part of the body. Boarding the saddle is placed in the lower part of the housing with the spring loaded piston, provided with an annular protrusion and the mechanical valve resting on the saddle.

In the annular chamber formed by the glass and landing saddle, placed the ring ledge spring piston, which can interact with the end surface of the glass and landing saddle. The cleaning rod axial channel of the throttle, as well as receiving chamber located in the axial channel of the spring piston.

The actuator rod cleanse is made in the form of a spring-loaded plunger mounted in the housing, with the ability to interact with a spring-loaded piston. The annular cavity has the ability to hydraulically connect to the discharge chamber. For inclusion in the composition of the discharge pipe commercial collector shall orpus provided with inlet and outlet pipes.

The operation of the device. The reservoir fluid through the supply channel, the annular cavity and a radial slit enters the receiving chamber with the detention of large particles. The reservoir fluid through the axial throttling channel is served in the outlet chamber and then through the discharge channel extends in the discharge line. Piston with mechanical valve is preloaded to the seat by spring force and pressure on the annular protrusion from the side of the bore.

The pusher is in the lowest position and is held therein by a spring configured to calculated pressure drop. When driving axial throttling channel solids or gas hydrates is an increase in the pressure differential between the inlet and outlet lines. This leads to a change in force on the power piston of the plunger and move the rod up to the stop in the piston with mechanical separation of the valve from the seat and the flow of the reservoir fluid under the piston with its sharp move up. Radial cracks are relatively sharp edges on the glass, which leads to the removal of sediment and solids.

At the same time the rod is in axial throttling channel interaction sediment layer on its inner surface.

The differential pressure is restored to the settlement.

The force of the compressed spring force, the piston pusher vozvrashays is in its initial position, the plunger also moves downward.

The rod with the piston returns to its original position with the nozzle face of the valve to the seat and go to the extraction of formation fluid in the axial throttling channel.

The disadvantages of the device are as follows:

- the complexity of installation of the device on the old wells, where it is difficult to find an available place, as well as to conduct hot work;

- multiple changes of direction of flow of the formation fluid in the device leads to a sufficiently large hydraulic losses, which is especially necessary to consider when equipping wells with low pressure drop.

The technical result that can be obtained with the implementation of the proposed invention, is as follows:

- reduction of local hydraulic resistance in the flow of produced formation fluid;

- improving the reliability of the design by reducing the impact of abrasive particles on the design details;

- possibility of mounting the unit in the axial channel of the discharge nozzle without additional operations when re wells with the exception of the fire works on the mouth.

The technical result is achieved by the fact that the throttle with automatic cleanup throttling channel nozzle consists of a body with pickup is Noah and outlet chambers, discharge nozzle, plunger, spring-loaded annular piston with mechanical valve, landing seat, glass and needles for cleaning.

The case is equipped with warmisham with longitudinal grooves and a needle holder with an axial channel, the associated bypass holes with throttling annular channel of the nozzle formed by the nozzle and needle. The glass is provided with a protrusion and connected with the housing threads to form between them an annular chamber in which is placed an annular piston with mechanical valve installed with the possibility of relying on the landing seat on the edge of the ledge and overlapping holes in the body of the glass in the original position. Masadaleather installed in the axial channel of the pusher with the possibility of formation of a movable connection of the needle clamp with nut, seal. The glass provided with an adjusting nut and the annular cavity between the plunger and the Cup is connected with a drain hole with its axial channel.

The device is illustrated by drawings, where:

figure 1 - the device in section, in the initial operating position of the parts;

figure 2. device in the incision, the position of the parts when cleaning throttling channel from deposits.

Throttle with automatic cleanup throttling channel consists of a body 1 with the outer mounting thread 2, on one end associated with features is Asim pipe 3. Inside the housing 1 is installed wertish 4 with longitudinal grooves 5 on the perimeter, on its outer side, facing the wall of the discharge pipe 3. Asymmetrically in vertise 4 has a needle holder 6 with the needle 7. On the opposite side in the axial channel of the housing 1 has a glass 8 with the annular protrusion 9 to form between them an annular cavity 10, in which is mounted an annular piston 11 with a mechanical valve 12 based on the boarding saddle 13, performed on the end surface of the annular protrusion 9. The annular piston 11 is installed with the formation of the annular chamber 14, are hydraulically connected by a number of holes 15 in the body of the housing 1 with the annular channel 16 formed by the housing 1 with a discharge pipe 3, which is hydraulically connected through the longitudinal grooves 5 wertish 4 with the inlet chamber 17.

Within the axial channel of the housing 1 has a plunger 18 resting on the annular piston 11 with nakedcapitalism 19 with a nozzle 20 are clamped by the nut 21, thus forming a sliding connection with the needle holder 6.

Needle holder 6 is made hollow with a by-pass channel 22, which is hydraulically connected bypass holes 23 with throttling annular channel 24 of the nozzle 20 formed with her needle 7.

The Cup 8 is provided with an adjusting nut 25 for pressing the spring ring 26 piston 11 with mechanical clapano, installed on the landing seat 13, with overlapping holes 27 extending in the axial channel 28 that is associated with the outlet chamber 29.

The axial channel 28 is also hydraulically connected with a drain hole 30 with the annular cavity 10.

Throttle with automatic cleanup throttling annular channel 24 of the nozzle 20 is as follows.

The device is mounted in the axial channel of the discharge nozzle 3. At the wellhead submit under the pressure of the formation fluid in the inlet chamber 17, where the stream is fed into the channel 22 of the needle holder 6 and then through the bypass holes 23, throttling annular channel 24 of the nozzle 20 with the output in the axial channel 28 of the Cup 8, associated with the discharge chamber 29. The excess pressure of the formation fluid from the inlet chamber 17 through the longitudinal grooves 5 and the annular chamber 16 is communicated with the annular cavity 14 under the annular piston 11. The force developed by the spring 26, balances the force from the pressure differential acting on the annular piston 11 from the annular cavity 14. In this position, is the exploitation of wells estimated flow rate and the calculated pressure drop. When driving throttling annular channel 24 solids or gas hydrates changes the mode of operation of wells with increasing pressure differential between the receiving 17 and outlet 29 of the cameras. Wt the exact pressure of the formation fluid, which is perceived by the cross-sectional area of the annular piston 11 is moving in the direction of wertish 4 with the separation of the mechanical valve 12 from the fitting of the saddle 13. This annular piston 11 further moves to wertico 4 with mechanical contact with the latter. Nut 21 nakedcaligula 19 slides on the surface of the needle holder 6 with putting it into the axial channel of the nozzle 20 and the cleaning of the inner surface of the sediments. The reservoir fluid is freely or with increased flow flows from the discharge chamber 17 through the longitudinal grooves 5, the annular chamber 16, a series of holes 15 in the body of the housing 1 and the holes 27 in the body of the Cup 8 in its axial channel 28 with the flow in the discharge chamber 29. When increased from the design flow of the pressure difference between the inlet 17 and outlet 29 chambers is reduced, which leads to the return of the ring piston 11 with a mechanical valve 12 by the force of the compressed spring 26 on the landing seat 13 with the termination of the hydraulic connection of the annular chamber 14 with an axial channel 28 of the Cup 8. Masadaleather 19 together with the pusher 18 is returned to its original position with continued submission of formation fluid through a throttling annular channel 24 of the nozzle 20 in the previous calculation mode.

Throttle with automatic cleanup throttling channel nozzle, consisting of a housing with a receiving and discharge chambers, the outlet is the future of the socket, pusher, a spring-loaded annular piston with mechanical valve boarding saddle, glasses, needles, characterized in that the enclosure is equipped with warmisham with longitudinal grooves and a needle holder, provided with axial channel hydraulically connected bypass holes with throttling annular channel of the nozzle formed by the nozzle and needle, glass ledge associated with the housing, forming between them an annular chamber in which is placed an annular piston with mechanical valve, with the possibility of relying on the landing seat on the edge of the ledge and overlapping holes in the body of the glass in the original position, masadaleather installed in the axial channel of the pusher with education flexible connection of the needle holder with nut and Cup provided with an adjusting nut, and an annular cavity between it and the plunger is connected with a drain hole with the axial channel of the glass.



 

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