RU2539481C1 - Device for oil recovery intensification - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil and gas industry and can be used in particular to prolong anhydrous operation conditions of oil producers. The substance of the invention: a device comprises a pipe string lowered into a well, a packer with a sealing member and a flow shutdown mounted therein; a hollow body comprises a pipe concentric with its axis. From above, this pipe is rigidly connected to the pipe string, and from below - to a piston. The pipe and piston are axially movable in relation to the hollow body from the flow shutdown. The hollow body from the flow shutdown is blind off from below; its holes are inclined at 120° to each other in three vertical planes along the perimeter of the hollow body. The first vertical plane comprises two holes above and below the sealing element of the packer, respectively. One hole is formed in the second vertical plane below the sealing element of the packer. The third vertical plane has one hole above the sealing element of the packer. The piston has a slot configured to provide an alternative connection of the holes of the vertical planes to the pipe inside when the pipe string and piston move axially and rotate about the hollow body of the flow shutdown. The hollow body of the flow shutdown is provided with an outer long slot inside from below, while the piston at the bottom has three inner long grooves inclined at 120° to each other along the perimeter; the outer long slot of the hollow body of the flow shutdown can be fixed in any of the three inner long grooves of the piston.

EFFECT: simplifying the operational structure of the device, improving its reliability and enhancing the same.

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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.

A device for intensifying oil production is known (RF patent No. 2282715, IPC E21B 43/14, published on 08.27.2006 in Bull. No. 24), 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 element of the packer, and inside the housing concentrically to its axis there is a pipe which is connected with the housing with its lower part, and its upper part interacts with the annular sleeve with axial movement and provided with an annular seal on the outer surface m and shear pins fixing it in the case, which when moving downwards, after cutting the pins, overlaps the holes in the case located above the packer sealing element, thereby shutting off the flow from the holes 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 anhydrous mode of operation of oil wells;

- thirdly, the complexity of the design in operation, due to the fact that in order to turn off the lower holes, it is necessary to remove the well pump from the well, and by any known method (for example, using a geophysical elevator or pump unit), move the annular sleeve downstream and disconnect the flow from holes below the packer seal;

- fourthly, limited functionality, so the device can only be operated with a sucker rod pump, since when operating the well with an electric centrifugal or screw pump, it is impossible to install the ball on the ring sleeve and move it down by creating excess pressure in the pipe string, since the pump is located above the device ;

- fifthly, removing a pump from a well, attracting a geophysical elevator or pump unit to move the annular sleeve down causes high material (process fluid, ball) and financial costs in operation.

The closest in technical essence is a device for operating a well and shutting off the flooded part of the formation (RF patent No. 2422422, IPC E21B 43/00, published on July 20, 2011 in Bulletin No. 20), including a pipe string lowered into the well, a packer with the 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 the pipe is located concentrically to its axis, an annular sleeve with shear pins having axial movement after cutting the pins , O-rings, 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 overlapping the holes of the housing above the sealing element packer, also the pipe is equipped with an upper row of holes communicating with the holes of the housing above the sealing element of the packer and a lower row of holes communicating with the packer space of the well, and the annular sleeve is secured with shear pins inside the pipe above its upper row of holes, and the top is equipped with a seat for a ball discharged from the mouth into the pipe string, while after cutting the pins, the annular sleeve has the ability to move down and seal the lower row of holes in the pipe , thus disconnecting the flow from the sub-packer space of the well.

The disadvantages of this device are:

- firstly, low reliability associated with the presence of destructive elements fixing the piston in the housing in the device structure, cut off at the rated load, while the impossibility of creating the calculated load (inclined barrel, sliding of the packer when unloading the pipe string onto the device) and / or miscalculations in determining the diameter of destructive elements can lead to failure of the device in operation;

- secondly, the complexity of the design in operation, due to the fact that to turn off the lower holes, it is necessary to remove the well pump from the well, drop the ball into the pipe string, create the necessary pressure with the pump unit to cut the pins of the ring sleeve and move it down and overlap bottom row of holes in the pipe;

- thirdly, removing the downhole pump from the well, attracting the pumping unit, tanker truck to move the ring sleeve down causes high material (process fluid, ball) and financial costs in the work;

- fourthly, limited functionality, so the device can only be operated with a sucker rod pump, since when operating the well with an electric centrifugal or screw pump, it is impossible to install the ball on the ring sleeve and move it down by creating excess pressure in the pipe string, since the pump is located above the device ;

An object of the invention is to simplify the design of the device in operation and increase the reliability of its operation, as well as reducing material and financial costs during the operation of the device and expanding its functionality.

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 sealing element and a flow switch installed in it, which is made in the form of a hollow body with holes, a pipe is concentric with its axis inside the hollow body, rigidly connected to the top a pipe string, and below it with a piston, also a pipe with a piston have the possibility of axial movement relative to the hollow body of the flow switch, an annular seal.

New is that the hollow body of the flow switch is muffled from below, and the holes in it are located at an angle of 120 ° between each other in three vertical planes around the perimeter of the hollow body, and in the first vertical plane there are two holes located respectively above and below the sealing element of the packer, one hole is made in the second vertical plane below the packer sealing element, one hole is made in the third vertical plane above the packer sealing element, the piston being equipped with a cutout that alternately communicates the holes of the vertical planes with the inner space of the pipe during axial and rotational movement of the pipe string with the piston relative to the hollow body of the flow switch, the hollow body of the flow switch inside the bottom provided with an external longitudinal groove, and the piston in the lower part with three internal longitudinal grooves, located at an angle of 120 ° between each other along the perimeter, while the hollow body of the flow switch with its outer longitudinal groove has the ability to be fixed in any of three internal longitudinal grooves of the piston.

In FIG. 1 schematically shows the proposed device in longitudinal section.

In FIG. 2 shows a section AA of the device.

In FIG. 3 shows a section BB of the device.

A device for intensifying oil production includes a pipe string 2 lowered into the well 1 (see FIG. 1), a packer 3 with a sealing element and a flow switch 4 installed in it, which is made in the form of a hollow body 5 with holes 6, 7, 8, 9 communicating respectively with the overpacker 10 and underpacker 11 spaces of the well 1. Inside the hollow body 5, a pipe 12 is located concentrically to its axis and is rigidly connected to the pipe string 2.

On top of the pipe 12 is rigidly connected to the pipe string 2, and on the bottom of the pipe 12 is rigidly connected to the piston 13. The pipe 12 with the piston 13 are able to axially move relative to the hollow body 5 of the flow switch 4.

The hollow body 5 of the flow switch 4 is muffled from below, and the openings 6, 7, 8, 9 (see FIGS. 1 and 2) in it are located at an angle of 120 ° with each other in three vertical planes 14 ′, 14 ″, 14 ′ ′ ′ along the perimeter of the hollow body 5. For example, holes 6, 7, 8, 9 in the hollow body 5 of the flow switch 4 are 25 mm in diameter.

In the first vertical plane 14 ′, two holes 6 and 7 are made, located respectively above and below the sealing element of the packer 3, in the second vertical plane 14 ″ below the sealing element of the packer 3 there is one hole 8, and in the third vertical plane 14 ′ ″ above the sealing element packer 3 made one hole 9.

The piston 13 is equipped with a cutout 15 (see figure 2), for example, made in the form of a segment with a width greater than the diameter of the holes 6, 7, 8, 9 (see figure 1), equal to 25 mm, in the hollow body 5 of the flow switch 4, for example, perform: width - and the cutout 15 is: a = 35 mm.

The cutout 15 (see FIGS. 1 and 2) of the piston 13 alternately communicates the holes (6 and 7), (8), (9) of the corresponding vertical planes 14 ′, 14 ″, 14 ″ with the inner space 16 of the pipe 12 with axial and rotational moving the pipe string 2 with the piston 13 relative to the hollow body 5 of the flow switch 4.

The hollow body 5 of the flow switch 4 inside the bottom is provided with an external longitudinal groove 17, for example, a length equal to: b = 0.3 m (see figure 1). The piston 13 in the lower part is provided with three internal longitudinal grooves 18 ′, 18 ″, 18 ″ (see FIGS. 1 and 3) located at an angle of 120 ° with each other along the perimeter of the piston 13 with a length of c = 0.4 m.

The hollow body 5 of the flow switch 4 with its outer longitudinal groove 17 has the possibility of fixing in any of the three internal longitudinal grooves 18 ′, 18 ″, 18 ″ of the piston 13.

The width - e of the outer longitudinal groove 17 of the hollow body 5 of the flow switch 4 (see FIG. 3) is smaller than the width f of each of the three inner longitudinal grooves 18 ′, 18 ″, 18 ″ made in the piston 13, for example, the width of the axial groove 17: e = 6 mm, and the width f of each of the three internal longitudinal grooves 18 ′, 18 ″, 18 ″ ′: f = 10 mm, i.e. (e <f).

Unauthorized fluid flows are eliminated by an annular seal 19.

A device for intensifying oil production works as follows.

The device on the pipe string 2 (see figure 1) is lowered into the well 1, while in the process of lowering the pipe string 2 into the well above it, the device is equipped with a pump (not shown in FIGS. 1, 2, 3) of any known construction, for example electric centrifugal. Packer 3 is planted (see FIG. 1) between the upper and lower perforation intervals (not shown in FIGS. 1, 2, 3) of the reservoir.

Install the device in the initial position (see Figs. 1, 2 and 3) so that the cutout 15 of the piston 13 is opposite the holes 6 and 7 of the vertical plane 14 ′, while the outer longitudinal groove 17 of the hollow body 5 of the flow switch 4 should be in the inner longitudinal groove 18 ′ of the piston 13.

Products from the well 1 (see FIG. 1) enter the device both from the lower perforation zone of the reservoir (not shown in FIGS. 1, 2, 3), that is, from the sub-packer space 11 (see FIG. 1) of the well 1 hole 6 of the hollow body 5 of the flow switch 4, cutout 15 of the piston 13 into the inner space 16 of the pipe 12, and from the upper perforation zone of the reservoir (not shown in Figs. 1, 2, 3), i.e. from the overpacker space 10 (see figure 1) of the well 1 through the hole 7 of the hollow body 5 of the flow switch 4, the cutout 15 of the piston 13 into the inner space 16 of the pipe 12.

In the inner space 16 of the pipe 12, the products from the overpacker 10 and the subpacker 11 spaces are mixed and fed into the pipe string 2 to receive a well pump (not shown in FIGS. 1, 2, 3), which pumps the products to the surface. During the operation of well 1 (see Fig. 1), waterlogging occurs, and waterlogging can occur both in the upper part of the reservoir (nadpakerny space 10 above the sealing element of the packer 3), for example, due to casing flows, and in the lower part of the productive formation (sub-packer space 11 below the sealing element of 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 (over-packer space 10 of well 1) or the lower (sub-packer space 11 of well 1) is turned off.

To disconnect the lower water-saturated part of the reservoir from the initial position from the wellhead, the pipe string 2 and the pipe 12 rigidly connected to it are lifted 12 with the piston 13 to a length greater than length b = 0.3 m, for example, to a length of 0.5 m, while the outer longitudinal the groove 17 of the hollow body 5 of the flow switch 4 (see FIGS. 1 and 2) emerges from the internal longitudinal groove 18 ′ of the piston 13.

Then turn the pipe string 2 from the mouth counterclockwise by an angle equal to 120 °, while the cutout 15 of the piston 13 is placed opposite the hole 9 made above the sealing element of the packer 3 in the third vertical plane 14 ″ ″, after which the pipe string 2 and rigidly the pipe 12 connected to it with the piston 13 is lowered downward, while the outer longitudinal groove 17 of the hollow body 5 of the flow switch 4 enters the inner longitudinal groove 18 ′ ″ of the piston 13 (see FIGS. 1, 2 and 3), because (e <f) and the piston 13 moves downward relative to the hollow body 5 of the flow switch 4 until it stops in the hollow body 5 of the flow switch 4 blanked from below. As a result, the product flow from the lower water-saturated zone of the formation, i.e. from subpacker 11 of the well space, it is turned off.

Further, the product flow comes only from the upper perforation zone (upper non-watered formation zone), that is, from the overpacker space 10 of the well 1, through the opening 9 of the hollow body 5 of the flow switch 4 cut-out 15 of the piston 13 into the inner space 16 of the pipe 12, from where the products are delivered through the pipe string 2 is received by the downhole pump (not shown in FIGS. 1, 2, 3).

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 from the wellhead from the initial position, raise the pipe string 2 (see Figs. 1 and 3) and pipe 12 rigidly connected to it with a piston 13 to a length greater than length b = 0.3 m, for example, to a length 0.5 m, with the outer longitudinal groove 17 of the hollow body 5 of the flow switch 4 coming out of the inner longitudinal groove 18 ′ of the piston 13.

Next, turn the pipe string 2 from the mouth clockwise by an angle equal to 120 °, while the cutout 15 of the piston 13 is located opposite the hole 8, made above the sealing element of the packer 3 in the second vertical plane 14 ″, after which the pipe string 2 and rigidly connected to her pipe 12 with the piston 13 is lowered downward, while the outer longitudinal groove 17 of the hollow body 5 of the flow switch 4 is included in the inner longitudinal groove 18 ″ of the piston 13 (see figures 1, 2 and 3), because (e <f) and the piston 13 moves downward relative to the hollow body 5 of the flow switch 4 to the stop in the muffled bottom hollow body 5 of the flow switch 4.

As a result, the flow of products from the upper water-saturated zone of the formation, i.e. from the overpacker space 10 the well is turned off.

Further, the product flow comes only from the lower perforation zone (lower non-watered formation zone), that is, from the sub-packer space 11 of the well 1, through the hole 8 of the hollow body 5 of the flow switch 4, cut-out 15 of the piston 13 into the inner space 16 of the pipe 12, from where the products are in the column pipe 2 is received at the downhole pump (figure 1, 2, 3 is not shown).

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

The proposed device for intensifying oil production has a simple structure in operation, since to turn off the device’s holes below the packer sealing element, the well pump is not removed from the well, additional equipment (pump unit, tanker with process fluid) and equipment (ball) are also turned off fluid flow from the sub-packer space (lower perforation intervals) of the well, and this allows to reduce material and financial costs in the work e device and by eliminating the destructive elements cut at the design load, the design of the device when the liquid flow off of nadpakernogo space (upper slots perforations) wellbore increases reliability of the device operation.

In addition, the proposed device for intensifying oil production allows you to expand the functionality, so the device can be operated with any type of pump, and the product flow is switched from the upper and lower perforation intervals by axial and rotational movement of the pipe string from the wellhead.

Claims (1)

A device for intensifying oil production, including a pipe string lowered into the well, a packer with a sealing element and a flow switch installed in it, which is made in the form of a hollow body with holes, a pipe is located concentrically along its axis and is rigidly connected to the pipe string from above, and bottom - with a piston, also a pipe with a piston can axially move relative to the hollow body of the flow switch, an annular seal, characterized in that the hollow body of the flow switch is plugged with , and the holes in it are located at an angle of 120 ° between each other in three vertical planes around the perimeter of the hollow body, and in the first vertical plane there are two holes located respectively above and below the sealing element of the packer, in the second vertical plane below the sealing element of the packer hole, in the third vertical plane above the sealing element of the packer, one hole is made, while the piston is equipped with a cut-out with the possibility of alternately communicating vertically steel planes with the inner space of the pipe during axial and rotational movement of the pipe string with the piston relative to the hollow body of the flow switch, the hollow body of the flow switch inside the bottom provided with an external longitudinal groove, and the piston in the lower part with three internal longitudinal grooves located at an angle of 120 ° between along the perimeter, while the hollow body of the flow switch with its external longitudinal groove has the ability to fix in any of the three internal longitudinal grooves of the piston.

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