RU2535544C1 - Device to up oil yield - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: device comprises the string lowered in the well, packer with the flow shutoff device composed of hollow body with bores. Note here that the pipe arranged aligned with its axis and rigidly coupled tuning is provided with top and bottom lines of bores, shear pins and O-rings. Hollow body top end has centring skid. Shear pins are arranged above top line of bores while there above said pipe has thrust ring arranged at spacing equal to that between said top and bottom lines of bores. Hollow body top bores are located above the packer while bottom bores are arranged below the packer. At initial position, top and bottom bores of pipe and hollow body are intercommunicated to communicate above- and under-packer well space with pipe inner space. Pipe shear pins thrusts against the hollow body top end. To shut off product flow from under-packer space this pipe can displace axially relative to hollow body and communicate it with the pipe inner space via the top line of bores. To shut off produce flow from above-packer space this pipe can displace axially downward after destruction of shear pins unless thrust ring thrusts against hollow body top end and above-packer space communicates with pipe inner space via aligned bottom bores of hollow body and top bores of the pipe.

EFFECT: simplified design, unlimited changeover of product flows.

3 dwg

Description

The invention relates to the oil and gas industry and can be used, in particular, to extend the anhydrous mode of operation of oil wells.

Known flow switch (RF patent No. 2184294, IPC F16K 11/02, publ. 06/27/2002), comprising a housing with inlet and outlet nozzles, bore diametrical and radial holes, a shut-off element equipped with cylindrical and conical sections, a drive, through the drive channel, made in a cylindrical section, and the housing is provided on both sides with smaller diameter cylindrical nozzles with removable seats located in them, and the nozzles are eccentric relative to the housing in which the through hole is made, perpendicular molar axis of the input (main) nozzle and the axis of which extends in a plane axes of the cylindrical nozzle and a flow switch is provided with a drive shaft with eccentric bushing included in the driving connection to the slide drive the closure member.

The disadvantages of this flow switch are:

- firstly, the complexity of the design, due to the large number of nodes and parts;

- secondly, to switch the flow requires an independent mechanical drive.

A device for intensifying oil production is known (RF patent No. 2282715, IPC E21B 43/14, published on 08.27.2006), including a packer with a flow switch installed in it, which is made in the form of a hollow body with holes located below and above the sealing packer element, and inside the housing concentrically to its axis there is a pipe, which is connected with the lower part to the housing, and its upper part interacts with the annular sleeve on the outer surface, which is axially movable and equipped with an annular seal and shear E pins, retaining it within the housing which when moved downwards, after cutting pins, covers openings of the cabinet, located above the sealing member of the packer, thereby cutting off flow from the orifices below the packer sealing element.

The disadvantages of this device are:

- firstly, the low functionality of the flow switch, as it allows you to turn off the fluid flow only from the lower holes and does not allow you to turn off the fluid flow from the upper holes (when watering the well production from above);

- secondly, low work efficiency due to the fact that when water is supplied from above it is impossible to extend the waterless operation mode of oil wells.

The closest in technical essence is a device for operating a well and shutting off the flooded part of the formation (RF patent No. 2424422, IPC E21B 43/00, published July 20, 2011), including a pipe string lowered into the well, a packer with a flow switch installed in it , which is made in the form of a hollow body with holes located above the packer sealing element, and inside the body concentrically to its axis there is a pipe, an annular sleeve with shear pins having axial movement after cutting the pins, rings e seals, while the pipe is rigidly connected to the pipe string, and the outside is equipped with a piston fixed in the housing with destructible elements, while the pipe with the piston after cutting the destructible elements have the possibility of axial movement downward relative to the body of the flow switch and hermetically closing the openings of the housing above the packer, also the pipe is equipped with an upper row of holes communicating with the holes of the housing above the packer, and a lower row of holes communicating with the under-packer space of the well, and the annular sleeve behind it is secured with shear pins inside the pipe above its upper row of holes, and on top it is equipped with a seat for a ball which is discharged from the mouth into the pipe string, and after cutting the pins, the annular sleeve has the ability to move down and seal the lower row of holes in the pipe, thereby disconnecting the flow from the sub-packer well space.

The disadvantages of this device are:

- firstly, the complexity of the design, due to the large number of nodes and parts (piston, ring sleeve, etc.);

- secondly, the laborious and lengthy process of shutting off the flow of produced products from the sub-packer space of the well, associated with the need to remove the well pump located in the pipe string above this device, unpacking the packer, and also dropping the ball into the pipe string and creating pressure in the string pipes with the involvement of the pump unit, sufficient to destroy the shear element and move down the sleeve with the subsequent descent of the borehole pump on the pipe string and landing packer ;

- thirdly, a device for one-time switching of the under-packer space of the well, since if the annular sleeve once overlaps the lower row of pipe holes, the device will not allow this to be performed if it is necessary to restore the selection of produced products from the under-packer space of the well.

The technical objectives of the invention are to simplify the design, reduce the complexity and duration of the process for disconnecting the produced products from the above- and sub-packer spaces of the well, as well as the implementation of the device with the ability to switch the flows of produced products from the above- and / or sub-packer spaces of the well an unlimited number of times.

The stated technical problem is solved by a device for intensifying oil production, including a pipe string lowered into the well, a packer with a flow switch installed in it, which is made in the form of a hollow body with holes, and a pipe rigidly connected to the pipe string is located inside the hollow body concentric with its axis equipped with upper and lower rows of holes, as well as shear pins and O-rings.

What is new is that the upper end of the hollow body is equipped with a centralizer on the outside, while the pipe below is equipped with a nipple with a conical surface tapering from top to bottom, and above the upper row of holes on the outside the pipe is equipped with shear pins, and above the shear pins the pipe is at a distance equal to the length between it the upper and lower rows of holes, equipped with a thrust ring, and the holes in the hollow body are made in two rows, while the upper row of holes of the hollow body is made above the packer, and the bottom row of holes of the hollow body is made n below the packer, and in the initial position, the upper and lower rows of the holes of the pipe and the hollow body communicate with each other and at the same time communicate the over-packer and under-packer spaces of the well with the inside of the pipe, while the shear pins of the pipe abut against the upper end of the hollow body, the flow of produced products from the sub-packer space of the well the pipe has the possibility of limited axial upward movement relative to the hollow body and communication of the over-packer space of the well the inner space of the pipe through its upper row of openings, while for shutting off the flow of produced products from the overpacker space of the well, the pipe has the possibility of limited axial movement downward after the shear pins are destroyed to support the thrust ring of the pipe in the upper end of the hollow body and the under-packer space of the well communicates with the inner space of the pipe through the combined lower row of holes of the hollow body and the upper row of holes of the pipe.

The figure 1 in longitudinal section schematically shows in the initial position the proposed device when selecting the produced products simultaneously from the overpacker and subpacker spaces of the well.

The figure 2 in longitudinal section schematically shows the proposed device for the selection of produced products from the overpacker space of the well.

The figure 3 in longitudinal section schematically shows the proposed device when selecting the produced products from the sub-packer space of the well.

A device for intensifying oil production includes a pipe string 2 lowered into a well 1 (see FIGS. 1, 2, 3), a packer 3 with a flow switch 4 installed in it, which is made in the form of a hollow body 5 with holes.

Inside the hollow body 5, a pipe 6 is located concentrically to its axis and is rigidly connected to the pipe string 2. The pipe 6 is provided with upper 7 and lower 8 rows of holes. The upper part of the hollow body 5 is equipped externally with a centralizer 9.

The pipe 6 below is equipped with a nipple 10 with a conical surface 11, tapering from top to bottom. Above the upper row of holes 7 outside, the pipe 6 is equipped with shear pins 12, for example, the fracture force of shear pins is 7 · 10 ⁴ N.

Above the shear pins 12 at a distance c, for example, equal to 3 m, the pipe 6 is equipped with a thrust ring 13. The distance is equal to the length b, equal to 3 m, between the upper 7 and lower 8 rows of holes of the pipe 6. The holes in the hollow body 5 are made in two a row, the upper row of holes 14 of the hollow body 5 is made above the packer 3, and the lower row of holes 15 of the hollow body 5 is made below the packer 3.

In the initial position (see FIGS. 1 and 2), the upper 7 and 14 rows of holes, as well as the lower 8 and 15 rows of holes, respectively, of the pipe 6 and the hollow body 5 communicate with each other and at the same time report the corresponding over-packer 16 and under-packer 17 boreholes 1 s the inner space 18 of the pipe 6, while the shear pins 12 of the pipe 6 abut against the upper end 19 of the hollow body 5.

To turn off the flow of produced products from the under-packer space 17, the pipe 6 has the possibility of limited axial upward movement of a length a, for example, equal to 2 m, relative to the hollow body 5 and communication of the over-packer space 16 of the well 1 with the inner space 18 of the pipe 6 through its upper row of holes 8 .

To turn off the flow of produced products from the above-packer space 16 of the well (upper part of the formation), the pipe 6 has the possibility of limited axial movement downward by a length b of 3 m, after the shear pins 12 are broken to support the thrust ring 13 of the pipe 6 into the upper end face 19 of the hollow body 5 and messages of the under-packer space 17 of the well 1 with the inner space 18 of the pipe 6 through the combined lower row of holes 15 of the hollow body 5 and the upper row 8 of the holes of the pipe 6. Unauthorized fluid flows are eliminated by annular seals opinions 20.

A device for intensifying oil production works as follows.

Install the device in the well 1 (see Fig. 1) using a lifting unit (Figs. 1, 2, 3 are not shown). To do this, first on the pipe string with a disconnector of any known design, for example with a mechanical disconnector with a left-hand thread, lower the hollow body 5 (see Fig. 1) of the flow switch 4 with packer 3 into the well 1 until the lower end of the hollow body 5 stops in the face ( figure 1, 2, 3 is not shown) well 1.

First, the packer 3 is planted (see FIGS. 1, 2, 3) in the well 1, and then the pipe string is disconnected from the hollow body 5 by means of a disconnector (left-hand thread) by rotating the pipe string clockwise from the wellhead 1. Then, it is removed a pipe string with a disconnector, and the hollow body 5 remains in the well, and centralizers 9 center the hollow body 5 relative to the axis of the well 1.

Next, a pipe 6 is lowered into the well 1 at the end of the pipe string 2, while in the process of lowering the pipe string 2 it is provided with a borehole pump (Figs. 1, 2, 3, not shown) of any known construction, for example, electric centrifugal. The pipe 6 (see FIGS. 1, 2, 3) with the conical surface 11 of the nipple 10 enters the hollow body 5. Next, the pipe string 2 with the pipe 6 is lowered into the hollow body 5 of the flow switch 4 until the pipe 6 with its shear pins 12 will not rest against the upper end 19 (see figures 1, 2, 3). This is evidenced by the presence of unloading (appearance of weight) on the weight indicator of the pipe string 2 (see FIGS. 1, 2, 3) installed at the wellhead 1. For example, the pipe string 2 is unloaded onto a device with a load of 5 · 10 ⁴ N.

Mount the faceplate (not shown in FIGS. 1, 2, 3) at the wellhead 1 (see FIGS. 1, 2, 3), while the device is in its original position (see FIG. 1), and the well 1 will begin to operate .

Produced products from the well 1 (see FIGS. 1, 2, 3) come simultaneously from the lower perforation zone of the reservoir (not shown in FIGS. 1,2,3), i.e. from the sub-packer space 17 (see FIG. 1 and 2) wells 1, through the lower rows of holes 8 and 15, respectively, of pipe 6 and hollow body 5 and into the inner space 18 of pipe 6, and from the upper perforation zone (not shown in FIGS. 1, 2, 3), that is, from the overpacker space 16 (see figures 1, 2, 3) of the well 1, through the upper rows of holes 7 and 14, respectively, of the pipe 6 and the hollow body 5 and into the interior 18 pipes 6.

Through pipe 6, the produced product enters the pipe string 2 to receive a well pump (not shown in FIGS. 1, 2, 3), which pumps the product to the surface.

During the operation of well 1 (see FIGS. 1, 2, 3), waterlogging occurs, and waterlogging can occur both in the upper part of the reservoir (nadpakerny space 16 of the well 1 above the packer 3), for example, due to casing flows, and in the lower part of the reservoir (sub-packer space 17 of the well 1 below the packer 3), for example, due to the pulling of the water cone to the lower perforation zone.

With the appearance of water in the production of the well, as evidenced by the increased water content of the produced products, the upper or lower water-saturated part of the formation is turned off.

To disconnect the lower water-saturated part of the reservoir (sub-packer space 17 of the well 1 below the packer 3) from the starting position (see Fig. 1), from the wellhead 1, with the help of a lifting unit, raise the pipe string 2 with pipe 6 (see Figs. 1 and 2) upwards by a length of 2 m relative to the hollow body 5, in this case the overpacker space 16 of the well 1 communicates with the inner space 18 of the pipe 6 through its upper row of openings 7, and the lower row of openings 7 of the pipe 6 is sealed by means of the ring seals 20 6 (see ig.2). Thus, the flow of produced products from the sub-packer space 17 of the well 1 is turned off, thereby blocking (disconnecting) the flow of products from the lower water-saturated zone of the formation.

Produced products come only from the upper perforation zone from the upper non-irrigated zone of the formation, that is, from the overpacker space 17 (see Figs. 1, 2, 3) of the well 1, through the upper row of holes 7 of the pipe 6 into the inner space 18 of the pipe 6, from where the pipe 6 and the pipe string 2 gets to receive a well pump that pumps products to the surface.

Thus, the flow of extracted products from the lower zone of the productive formation, which is flooded, is shut off, and the products are extracted only from the upper non-irrigated zone of the formation.

To disconnect the upper water-saturated part of the reservoir (over-packer space 16 of the well 1 above the packer 3) from the starting position (see Fig. 1), from the wellhead 1, with the help of a lifting unit, the pipe string 2 with the pipe 6 is completely unloaded downward, while the shear pins are first destroyed 12 and the pipe 6 with the pipe string 2 are moved downward relative to the hollow body 5 by a distance c = b of 3 m between the upper 7 and lower 8 rows of holes of the pipe 6 to the pipe support 6 by the thrust ring 13 into the upper end face 19 of the hollow body 5, with this is a sub-post message the first space 17 of the well 1 below the packer 3 with the inner space 18 of the pipe 6 through the lower row of holes 14 of the hollow body 5 and the upper row of holes 7 of the pipe 6, and the lower row of holes 8 of the pipe 6 is sealed by means of O-rings 20 by the hollow body 5 (see Fig. .3).

Produced products come only from the lower perforation zone from the lower non-irrigated zone of the formation, that is, from the sub-packer space 17 of the well 1, through the lower row of holes 15 of the hollow body 5 and the upper row of holes 7 of the pipe 6, from where it enters the inner space 18 of the pipe 6, from where the pipe 6 and the pipe string 2 is received by a well pump that pumps products to the surface.

Thus, the flow of produced products is switched off from the upper zone of the reservoir (from the overpacker space 16 of the well 1) and the products are extracted only from the lower unrouted zone of the reservoir (from the subpacker space 17 of the well 1).

To return the device to its original position, shown in figure 1, it is necessary to raise the pipe string 2 with pipe 6 from the wellhead 1 with the help of a lifting unit to a distance c = b = 3 m between the upper 7 and lower 8 rows of pipe holes 6, while the produced products from the well 1 (see FIGS. 1, 2, 3) come simultaneously from the lower perforation zone of the reservoir (not shown in FIGS. 1, 2, 3), i.e. from the sub-packer space 17 (see FIG. 1 and 2) wells 1, through the lower rows of holes 8 and 15, respectively, of pipe 6 and hollow body 5 and into the inner the space 18 of the pipe 6, and from the upper perforation zone (not shown in FIGS. 1, 2, 3), that is, from the over-packer space 16 (see FIGS. 1, 2, 3) of the well 1, through the upper rows of holes 7 and 14 respectively, the pipe 6 and the hollow body 5 and into the inner space 18 of the pipe 6.

Through pipe 6, the produced product enters the pipe string 2 to receive a well pump (not shown in FIGS. 1, 2, 3), which pumps the product to the surface.

To disconnect the lower water-saturated part of the reservoir (sub-packer space 17 of the well 1 below the packer 3) from the wellhead 1, with the help of a lifting unit, lift the pipe string 2 with pipe 6 upwards by a + b length (see Figs. 1 and 2), i.e. 2 m + 3 m = 5 m, relative to the hollow body 5, the overpacker space 16 of the well 1 communicates with the inner space 18 of the pipe 6 through its upper row of openings 7, and the lower row of openings 8 (see FIG. 2) of the pipe 6 is hermetic by means of O-rings 20 is blocked by a pipe 6.

Thus, the flow of produced products from the sub-packer space 17 of the well 1 is turned off, thereby blocking (disconnecting) the flow of products from the lower water-saturated zone of the formation.

Produced products come only from the upper perforation zone from the upper non-watering zone of the formation, that is, from the overpacker space 17 (see Figs. 1, 2, 3) of the well 1, through the upper row of holes 7 of the hollow body 5 of the flow switch 4 into the inner space 18 of the pipe 6, from where it passes through pipe 6 and pipe string 2 to a well pump that pumps products to the surface.

Thus, the flow of extracted products from the lower zone of the productive formation, which is flooded, is shut off, and products are extracted only from the upper non-irrigated zone of the formation.

The device for intensifying oil production allows you to switch the flow of produced products either from the upper part of the reservoir, or from the bottom of the reservoir or to simultaneously select products from the lower and upper parts of the reservoir, depending on which part of the reservoir is watered earlier, due to which the proposed the device allows to increase the duration of the anhydrous mode of operation of oil wells.

The proposed device for the intensification of oil production has a simple design, which allows to reduce the complexity and duration of the technological process for disconnecting the produced products from the above- and / or under-packer spaces of the well by moving the pipe string up and down from the wellhead, and the device also allows switching the flows of produced products from over- and / or sub-packer well spaces an unlimited number of times.

Claims (1)

A device for intensifying oil production, including a pipe string lowered into the well, a packer with a flow switch installed in it, which is made in the form of a hollow body with holes, and inside the hollow body concentric with its axis is a pipe rigidly connected to the pipe string and provided with upper and lower rows of holes, as well as shear pins, and O-rings, characterized in that the upper end of the hollow body is equipped with a centralizer on the outside, while the pipe is equipped with a cone-shaped nipple from below, tapering from top to bottom, and above the upper row of holes on the outside the pipe is equipped with shear pins, and above the shear pins the pipe at a distance equal to the length between its upper and lower rows of holes is equipped with a thrust ring, and the holes in the hollow body are made in two rows, while the upper a row of holes of the hollow body is made above the packer, and the lower row of holes of the hollow body is made below the packer, and in the initial position, the upper and lower rows of holes of the pipe and hollow body communicate with each other and at the same time they protect the above-packer and under-packer spaces of the well with the inner space of the pipe, while the shear pins of the pipe abut against the upper end of the hollow body, and to turn off the flow of produced products from the under-packer space of the well, the pipe has the possibility of limited axial upward movement relative to the hollow body and the overpacker space of the well communicates with the inner the space of the pipe through its upper row of holes, while to shut off the flow of produced products from the overpacker space with The borehole of the pipe has the possibility of limited axial movement downwards after the shear pins are destroyed to support the thrust ring of the pipe in the upper end of the hollow body and the under-packer space of the well communicates with the pipe interior through the combined lower row of holes of the hollow body and the upper row of pipe holes.

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