RU2563464C1 - Coupling for gas bypass from annulus - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: coupling contains top connection to connect with tubing of large diameter, bottom connection to connect with tubing with small diameter, expansion around part of bottom connection to connect with branch having said large diameter, channel to exhaust the companion gases, comprising longitudinal and transverse parts. At that the longitudinal part of the channel to exhaust the companion gases of the coupling passes along the coupling from its top to level of the coupling connection with the branch. The transverse part for the companion gases exhaust of the coupling is through hole passing perpendicular to the transverse part of the coupling, the hole connects the space beyond the coupling with the said expansion.

EFFECT: increased reliability and expansion of the functionality.

6 cl, 3 dwg

Description

FIELD OF THE INVENTION

The invention relates to oil production, and in particular to a device used in a single-lift circuit using a sucker rod pump.

State of the art

Currently, oil companies of the Russian Federation are actively using technologies for simultaneously separate oil production. Among the various schemes used, the single-lift scheme with the use of a sucker rod pump is most often used; packers are used to “cut off” the formations.

The disadvantages of this scheme

1. There is no control over the parameters of the reservoir cut off by the packer (lower).

2. There is no technical possibility of utilizing the gas released in the sub-packer zone and adversely affecting the operation of the sucker rod pump.

There is no possibility of supplying demulsifiers, inhibitors to the under-packer zone.

Moreover, the following solutions are known in the art.

A device for transferring gas from annulus to a tubing string disclosed in patent RU 2303124 is known as a prototype. The invention relates to underground downhole equipment and can be used in the operation, development, jamming and flushing of vertical, inclined and horizontal oil wells during operations involving gas bypass from the annular space of the well into the tubing string. Provides increased efficiency of the device in the winter under the influence of negative temperatures. The inventive device includes connected at both ends with tubing coupling with a side hole. The coupling is connected by a lateral surface to a lateral surface of the housing with a fit on a maximum plane to ensure the greatest heat transfer from the coupling to the housing. The housing is provided with a longitudinal channel connected to each other and a side hole aligned with the side hole of the coupling. A fitting and a check valve with a filter are located in the longitudinal channel of the housing. The non-return valve provides gas bleeding when the pressure in the annulus exceeds the pressure in the tubing string by 0.1-0.2 MPa. Moreover, the device provides a reduction in flow rate during fluid circulation by no more than 10%.

A diagram of a known device is shown in FIG. 1. From FIG. 1 it is clear that the device according to RU 2303124 does not provide the ability to easily drill a horizontal channel of the well, requires accurate alignment of the holes in the sleeve and body, removes the associated gases to the tubing, and not to a separate channel.

Also known well installation Garipova (patent RU 2415255). The invention relates to the field of hydrocarbon production, including in multilayer fields, and is used for simultaneous separate or sequential operation of several formations of a single production or injection well. The technical result is the simplification of technological work to regulate the operation of the well in real time, ensuring the efficiency of the operation of the well in determining a reliable and optimal mode of operation. A downhole installation consists of a high-pressure device, tubing - tubing, a landing device with a pocket having at least one passage hole and at least one bypass channel, a regulator located in the pocket of the landing device and having, at least one passage opening, at least one bypass channel, and at least one predetermined pressure chamber interacting with a locking device of at least one sealing element, position conjugated to the controller and configured to seal the holes and crossing the passageway controller, at least one hydraulic channel passing through the tubing or inside the tubing and hermetically connecting the pressurized high-pressure unit with a pocket landing gear. The fluid flow rate controller comprises a piston chamber with at least one through-hole and a locking device in the form of a piston and a seat made with a fitting, a bellows chamber with at least one through-hole and a locking device in the form of a shutter and a saddle at least one bypass channel hydraulically connected to the through holes of the piston and bellows chambers and providing the ability to control the flow of borehole fluid from the tubing into the annulus or, conversely, using a shutter and pcs Cera. The controller contains a connecting channel hydraulically connected to the through holes of the piston and bellows chambers for separate passage of the working agent into them. The downhole chamber consists of a shirt, a pocket containing a fluid flow rate regulator with a bellows and piston chambers of a given pressure and a connecting channel and made with internal bores with at least one seating surface, and at least one bypass channel located in pocket or shirt and pocket to ensure control of the volume of well fluid flowing through it from the tubing tubing space or, conversely, and with at least one through hole, is located th in the landing surface or landing between the surfaces for feeding working fluid into one of the chambers and a predetermined pressure in the connecting channel fluidly connected to passage openings of the two chambers for the separate passage therein working fluid.

However, the above device according to RU 2415255 does not allow easy drilling of the horizontal channel of the well.

A mechanical double-barrel packer with cable entry is also known (Patent RU 2468185).

The invention relates to equipment for decoupling the annulus in wells with leakage intervals with one or more layers. Provides increased operational reliability of the packer when used as an upper packer in two or more packer configurations for well operation with submersible pumping equipment of the ESP type. A double-barrel packer with a cable entry contains packer and inner shafts inserted one into the other and fastened together with orientation along the cable entry, a packer assembly, a mechanical drive, a cable entry sealant with gas exhaust lines or for pumping chemicals. The packer drive is a mechanical push action, the inner barrel of the packer is made up of upper, middle and lower parts, the lower end of the middle of the inner barrel of the packer has a protrusion for interaction with the drive cylinder. Shear elements are installed in the through holes of the lower end of the middle part and the upper end of the lower part of the inner trunk of the packer.

However, the above device according to RU 2468185 does not allow easy drilling of a horizontal well channel.

Disclosure of invention

In one aspect of the invention, a sleeve is disclosed for bypassing gas from the annulus, comprising an upper connection for connecting to a larger diameter tubing; lower connection for connection to a tubing of smaller diameter; expanding around a portion of the lower connection to connect to a pipe having said larger diameter; channel for the removal of associated gases, consisting of longitudinal and transverse parts; moreover, the longitudinal part of the channel for the removal of associated gases of the coupling extends along the coupling from its top to the level of connection of the coupling with the pipe; the transverse part of the channel for the removal of associated gases of the coupling is a through hole extending perpendicular to the transverse part of the coupling, connecting the space outside the coupling with the said extension.

In further aspects, a sleeve is disclosed in which the upper connection is a connection with a 2.5 ″ diameter tubing and the lower connection is a connection with a 1.5 ″ diameter tubing.

In other further aspects, it is disclosed that the sleeve comprises an outer closure member configured to close a through hole; the closing element is adapted to be attached to the coupling by means of a thread; the coupling is configured to be connected to a capillary tube for transporting associated gas; the channel for the removal of associated gases is configured to supply chemical reagents.

The problem to which the invention is directed is to provide a reliable, multifunctional device that provides the ability to remove associated gases, supply chemicals and easily drill horizontal channels in the well.

The technical result provided is to increase the reliability and expand the functionality of the coupling for bypassing gas from the annulus.

This result is ensured due to the fact that after the installation of the coupling does not require any manipulations to ensure the movement of the associated gas through the channel for the removal of related gases; a channel for drilling a horizontal well is made in the coupling, and this channel for drilling a horizontal well is partially combined with a channel for removing associated gases.

Brief Description of the Drawings

FIG. 1 shows a coupling disclosed in a prototype (longitudinal and transverse sections).

FIG. 2 shows a schematic illustration of one embodiment of the proposed coupling.

FIG. 3 shows a diagram of the installation of simultaneously separate production of a 1-lift structure complete with a special coupling.

The implementation of the invention

The developed technical solution is an improvement of the solution selected as a prototype disclosed in patent RU 2303124. A significant difference from the prototype is that it is partially aligned with the channel for drilling a horizontal well in the coupling into the channel for the removal of associated gases, as well as that for the drain gases provided a separate channel.

The applicant believes that if a specialist in the field of technology solved the problem of ensuring the possibility of drilling a horizontal channel in a vertical well containing a sleeve known from RU 2303124, he would have made the obvious decision to make another hole in the sleeve through which a horizontal channel would be drilled .

The presence of an additional hole would impair the mechanical strength of the coupling and, as a result, would reduce its reliability.

Moreover, the decision to combine the channel for the removal of gases and the channel for drilling a horizontal well is not obvious.

In addition, the design of the coupling in accordance with RU 2303124 requires accurate alignment of the channel for the exhaust gas of the coupling and the corresponding channel in the housing, which complicates the use of the coupling and reduces its reliability, since in the case of inaccurate alignment of the said channels, the removal of associated gases will be impaired or even impossible, which also affects the reliability of the coupling.

It should also be noted that in the device according to RU 2303124, the associated gas goes to the tubing, and not to a separate channel, which complicates its further utilization.

The developed technical solution allows to overcome at least the above disadvantages.

The design of the developed coupling does not require precise alignment of the gas exhaust channel, since in any position of the coupling relative to the tubing, the associated gas freely penetrates the coupling and further into the channel for the removal of associated gas.

One embodiment of the proposed clutch is shown in FIG. 2, from which it can be seen that the coupling is an integral element that does not require alignment with any other elements.

The tubing is attached to the coupling in particular by means of a threaded connection, although any other connection, for example, locking ones, can be used.

In FIG. 3 shows a diagram of an installation for simultaneous and separate production of a 1-lift structure complete with a special coupling,

where 1 is the production casing

2 - tubing string 2.5 ′ ′

3 - capillary pipeline

4 - special coupling with capillary inlet

5, 8 - tubing pipe 2.5 ′ ′

6, 9 - tubing shank 1.5 ′ ′

7 - production packer

10 - spiral slotted filter

11 - pump

From FIG. 3, the operation of the coupling is understood. The annulus (accompanying) gas moves freely between the nozzle 8 and the shank 9, since they have a different diameter, while the shank 9 passes inside the nozzle 8. Rising up, the annular gas enters the expansion of the coupling formed by the space between the nozzle 8 and the shank 9 (in section they are marked 5 and 6, respectively). Further, from the expansion of the coupling, the associated gas enters the channel for the removal of associated gases and then moves up the capillary pipe.

This design of the coupling makes it easy to mount it in the well, provides reliable removal of associated gas.

Although in FIG. 3, the through hole of the coupling for drilling a horizontal well is not shown; one skilled in the art will easily understand how to make it.

The mere presence of a hole in the coupling for drilling a horizontal well channel simplifies the process of drilling a horizontal well. And the fact that this hole is made in the coupling of the described construction makes it possible to easily specify the direction of drilling of the horizontal channel, since turning the coupling only is much easier than turning the entire tubing.

The claimed device also allows for the supply of chemicals to the under-packer zone. For this, to the capillary conduit in FIG. 3 it is necessary to connect the installation for supplying chemicals.

To improve the operation of the coupling, it is equipped with a closing element, made with the possibility of closing a through hole designed for drilling a horizontal well. The closure element ensures that all associated gas enters the channel for the removal of associated gases, and when chemical reagents are supplied through said channel, all reagents enter the space below the packer, as is clear from FIG. 3. In one embodiment, the closure element is attached to the coupling by means of a thread.

All dimensions shown in the drawings are exemplary and are provided to facilitate understanding, depending on the tasks to be solved, a specialist in the field of technology can make changes to the geometric dimensions of the coupling without leaving the scope of the claims.

Embodiments are not limited to the options described herein, to a person skilled in the art based on the information set forth in the description and knowledge of the prior art, other embodiments of the invention will become apparent without departing from the spirit and scope of the present invention.

Claims (6)

1. A coupling for transferring gas from the annulus, comprising an upper connection for connecting to a larger diameter tubing, a lower connection for connecting to a smaller diameter tubing, expanding around a portion of the lower connection for connecting to a larger diameter tubing, a channel for the removal of associated gases, consisting of a longitudinal and transverse parts, and the longitudinal part of the channel for the removal of associated gases of the coupling extends along the coupling from its top to the soy level Inonii coupling with the pipe, the transverse part of the channel for discharging gases associated clutch is extending perpendicularly to the transverse part of the sleeve through hole connecting a space outside the sleeve to said extension. 2. The sleeve according to claim 1, in which the upper connection is a connection with a tubing with a diameter of 2.5 ″ and the lower connection is a connection with a tubing with a diameter of 1.5 ″. 3. The sleeve according to claim 1, wherein the sleeve includes an outer closure member configured to close the through hole. 4. The coupling according to claim 3, in which the closing element is made with the possibility of fastening to the coupling by means of a thread. 5. The coupling according to claim 1, in which the coupling is made with the possibility of connection with a capillary tube for transporting associated gas. 6. The coupling according to claim 1, in which the channel for the removal of associated gases is made with the possibility of supplying chemical reagents.

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