Device for shutoff of water-flooded formation part

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

3 dwg

 

The invention relates to the oil and gas industry and can be used, in particular, to prolong waterless operation of oil wells.

A device for intensification of oil production (patent RF №2282715, IPC EV 43/14, publ. 27.08.2006, bul. No. 24), comprising a packer provided therein deactivation switch flow, which is made in the form of a hollow housing with apertures located above and below the sealing element of the packer, and inside the housing concentrically to its axis is a tube that its lower part is connected to the housing, and the upper part on the outer surface cooperates with an annular sleeve, with the possibility of axial movement and provided with an annular seal and shear pins, locking it in the case, which when moved down, after cutting the pins, blocks the openings in the hull located above the sealing element of the packer, thus disabling the flow from the holes below the sealing element of the packer.

The disadvantages of this device are:

- first, low functional ability disconnector flow, as it allows you to disable the flow of fluid only from the lower holes and allows you to disable the flow of fluid from the upper holes (when watering products well top);

- secondly, low eff�aktivnosti work associated with the fact that when entering the water from above it is impossible to prolong waterless operation of oil wells;

- thirdly, the complexity of the design in the work connected with the fact that to disable the lower holes you want to retrieve the downhole pump wells, and any known method (for example, involving geophysical lift or pump unit) to move the annular sleeve down flow and off flow from the holes below the sealing element of the packer;

- fourthly, limited functionality, so the instrument may only be used with sucker rod pump because the well operation of the centrifugal or screw pump is impossible to set the bead on the ring nut and move it down the creation of excess pressure in the column of pipes, as the pump is placed above the device;

- fifth, removing the pump from the well, the attraction of geophysical lift or pump unit to move the annular sleeve down causes high material (process liquid, the ball) and financial costs.

The closest in technical essence is a device for operation of the well and disconnected the flooded part of the reservoir (RF patent No. 2422422, IPC EV 43/00, publ. 20.07.2011. in bull. No. 20), including CPUs�nnuu into the well pipe string, packer provided therein deactivation switch flow, which is made in the form of a hollow housing with apertures located above the sealing element of the packer, and inside the housing concentrically to its axis is a tube, an annular sleeve with shear pins, with the possibility of axial movement after cutting the pins, the ring seal when the pipe is rigidly connected with the column pipe, and the outside is provided with a piston connected to the body of destructible elements, with the tube with the piston after cutting destructible elements are free to move axially downward relative to the housing disconnector flow and tight shutoff of housing bore above the sealing element of the packer, also the pipe is provided with an upper series of holes, communicating with the housing bore above the sealing element of the packer, and the lower series of holes, communicating with sub-packer space of the well, the annular bushing fixed shear pins inside the pipe above his upper row of holes, and the top is provided with a saddle under discharged from the mouth to the column of pipes ball, after cutting the pins of the annular sleeve is movable down and sealed overlapping the lower row of holes in the pipe, thus disabling the flow from below the packer space of the well.

The disadvantages of this device�an are:

- first, the low reliability associated with the presence of destructive elements, the locking piston in the housing design, srezalsya at rated load, with the impossibility of creating design load (inclined shaft, the slide of the packer during the unloading of the column of pipes on the device) and/or miscalculations in determining the diameter of damaging elements can lead to device failure in the work;

- secondly, the complexity of the design in the work connected with the fact that to disable the lower holes you want to retrieve the downhole pump from the well, throw the ball in a pipe string, to create the necessary pressure with the involvement of a pump unit for cutting the pins annular sleeve and move it down and overlapping the lower row of holes in the pipe;

- thirdly, removing the well pump from the well, engaging the pump unit, tank trucks to move the annular sleeve down causes high material (process liquid, the ball) and financial expenses in the work;

- fourthly, limited functionality, so the instrument may only be used with sucker rod pump because the well operation of the centrifugal or screw pump is impossible to set the bead on the ring nut and move it down the creation and�batocera column pressure pipes, as the pump is placed above the device;

An object of the invention is to simplify the design of the device and improving the reliability of its work, as well as reducing material and financial cost of the operation of the device and extending its functionality.

The stated technical problem is solved by a device for disabling the flooded part of the reservoir, including lowered into the well pipe string, a packer provided therein deactivation switch flow, which is made in the form of a hollow housing with a top row of holes placed above the sealing element of the packer and communicating with nadakarni space inside the hollow body concentrically to its axis is a tube, the top is rigidly connected with the column pipe, and the lower part of the piston pipe piston have the possibility of axial movement relative to the hollow body disconnector thread, o-ring seals.

What is new is that in hollow casing below the sealing element of the packer in the lower row of holes communicating with the sub-packer space of the well, the piston is hollow and sealed bottom, and opposite upper and lower rows of holes of the hollow body, the piston has an internal cylindrical sample and a number of through holes communicating with the inner space of the pipe, if it� floors in the building above the top row of radial holes made shaped groove in one longitudinal groove and three transverse grooves, and the transverse groove is made of upper, middle and lower parts of the longitudinal groove, and in curly groove of the hollow body for axial and transverse movement is mounted a guide pin rigidly mounted in the piston above its upper inner ring of the sample, and when placing the guide pin in the transverse groove formed from the middle part of the longitudinal groove, wherein the upper and lower rows of holes of the hollow body through the inner cylindrical sample and a number of through holes of the piston are communicated with the inner space of the pipe, and when placing the guide pin in the transverse groove formed from the upper part of a longitudinal groove, the top row of holes of the hollow body through the inner cylindrical sample and a number of through holes of the piston is communicated with the inner space of the pipe, while the bottom row of holes of the hollow body is hermetically covered by the piston, and when placing the guide pin in the transverse groove formed from the lower part of the longitudinal groove of the lower row of holes of the hollow body through the inner cylindrical sample and a number of through holes of the piston is communicated with the inner space of the pipe, with the top row of holes of the hollow body is hermetically covered by the piston.

On Fi�ur 1 schematically shows the proposed device in longitudinal section.

Figure 2 shows a section a-a of the device.

Figure 3 illustrates a reamer shaped groove.

Device to disconnect the flooded portion of the reservoir includes lowered into the borehole 1 (see Fig.1) the column of pipes 2, the retainer 3 with a sealing element and provided therein deactivation switch flow 4, which is made in the form of the hollow body 5 with the top row of holes 6, placed above the sealing element of the packer 3 and communicating with nadakarni space 7 wells 1.

The retainer 3 is mounted between the upper and lower zones of perforations made respectively in the upper and lower parts of the formation. Inside the hollow body 5 concentrically to its axis is a tube 8, rigidly connected with the column pipe 2.

Top tube 8 is rigidly connected with the column pipe 2, and the bottom pipe 8 is rigidly connected with the piston 9. Pipe 8 and a piston 9 have the possibility of axial movement relative to the hollow body 5 disconnector flow 4.

In hollow housing 5 below the sealing element of the packer 3 is the bottom row of holes 10 communicating with the sub-packer space of 11 wells 1.

The piston 9 is hollow and sealed bottom and opposite top 6 and the bottom 10 rows of holes of the hollow body 5, the piston 9 has an inner cylindrical sample 12 (see Fig.1 and 2) and a number of through holes 13, communicating with the inner space 14 �ruby 8. The length of the inner cylindrical sample of 12 of the piston 9 exceed the distance between the top 6 and the bottom 10 rows of radial holes of the hollow body 5 disconnector flow 4.

The bandwidth of a number of through holes 13 formed with a diameter D, for example equal to 20 mm more than the total throughput of the top 6 and the bottom 10 rows of radial holes, made with a diameter d, for example equal to 15 mm, which prevents locking of the flow and the stagnation of production in the annular space of the inner cylindrical sample of 12 of the piston 9.

In hollow housing 5 above the top row of holes 6 are shaped groove 15 (see Fig.1 and 3) in the form of one of the longitudinal groove 16 and three transverse grooves 17', 17", 17"'.

Transverse grooves 17', 17", 17'" are made of upper, middle and lower parts of the longitudinal groove 16.

In curly groove 15 of the hollow body 5 with the possibility of axial and transverse displacement mounted guide pin 18 are rigidly secured to the piston 9 above its inner cylindrical sample 12.

When placing the guide pin 18 in the transverse groove 17", made from the middle part of the longitudinal groove 16, the top 6 and the bottom 10 rows of holes of the hollow body 5 through the inner cylindrical sample 12 and a number of through holes 13 are communicated with the inner space 14 of the pipe 8.

When placing direction�known of the pin 18 in the transverse groove 17', made from the upper part of the longitudinal groove 16, the upper 6 a number of holes of the hollow body 5 through the inner cylindrical sample 12 and a number of through holes 13 of the piston 9 is communicated with the inner space 14 of the pipe 8, while the bottom row of holes 10 of the hollow body 5 is hermetically covered by the piston 9.

When placing the guide pin 18 in the transverse groove 17'" made from the bottom of the longitudinal groove 16, the bottom row of holes 10 of the hollow body 5 through the inner cylindrical sample 12 and a number of through holes 13 is communicated with the inner space 14 of the pipe 8, while the upper row of holes 6 of the hollow body 5 is hermetically covered by the piston 9. Unauthorized overflows of liquid are excluded annular seal 19, 20.

The device to disconnect flooded part of the reservoir operates as follows.

At the wellhead install the device in an initial position (see Fig.1 and 3) so that the guide pin 18 was located in the transverse groove 17" shaped groove 15, with the top 6 and the bottom 10 rows of holes of the hollow body 5 through the inner cylindrical sample 12 and a number of through holes 13 are communicated with the inner space 14 of the pipe 8.

The device on the column pipe 2 is lowered into the borehole 1, wherein in the process of the descent of the column of pipes 2 into the well of its OS�amaut pump (Fig.1, 2, 3 not shown) of any known design, such as ESP. Produce planting packer 3 (see Fig.1) between the upper and lower perforated intervals (Fig.1, 2, 3 not shown) of the productive formation.

Production from well 1 (see Fig.1) enters the device from the lower zone of perforation of the productive formation (Fig.1, 2, 3 not shown), that is, from below the packer and space 11 (see Fig.1) wells 1 through the bottom row of holes 10 of the hollow body 5 in the annular space of the inner cylindrical sample of 12 of the piston 9.

Also production from the well 1 is supplied to the device and from the upper zone of perforation of the productive formation (Fig.1, 2, 3 not shown), that is, from nadakarni space 7 (see Fig.1 and 3) wells 1 through a series of radial holes 6 of the hollow body 5 in the annular space of the inner cylindrical sample of 12 of the piston 9.

In the annular space of the inner cylindrical sample of 12 of the piston 9, the flow of products coming into the device from the upper and lower parts of the productive formation through the mix and number of through holes 13 are received in the internal space 14 of the pipe 12 and then along the column of pipes 2 raised to the reception of the downhole pump (Fig.1, 2, 3 not shown) which pumps the product to the surface.

In the lifetime of the well 1 (see Fig.1) flooding occurs prod�functions, moreover, the products flooding can occur in the upper part of the productive formation (nadakarni space 7 above the sealing element of the packer 3), for example, due to cross-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 water cone to the lower zone of perforation.

With the appearance of water in the production wells, as evidenced by increased water-cut, is cut off the top (nadakarni space 7 wells 1) or bottom (below the packer 11 space well 1) water-saturated part of the formation.

To disable the lower water-saturated part of the reservoir from the initial position (see Fig.1 and 3) with the wellhead turn the column of pipes 2 and rigidly connected with it by a pipe 8 with the piston 9 relative to the fixed hollow body 5 counterclockwise by an angle larger than 60°, corresponding to the length (C=0.1 m) transverse groove 17, for example by 90° and length 0.15 m, then lift the pipe string 2 length large length b=0.5 m, for example at 0.8 m and then turn the column of pipes 2 and rigidly connected with it by a pipe 8 with the piston 9 in the clockwise direction at an angle larger than 60°, corresponding to the length (C=0.1 m) transverse grooves 17', for example 90° and length 0.15 m. as a result Prov�daily actions guide pin 18 is moved from the leftmost position up transverse grooves 17" shaped groove 15 through the longitudinal groove 16 in the leftmost position of the transverse grooves 17' shaped groove 15, in this case the lower row of radial holes 10 of the hollow body 5 is tightly clipped seal ring 20. As a result, the product flow from the lower water-bearing zone of the reservoir, i.e. from sub-packer 11 space wells is disabled.

Next, the flow of products sourced only from the top of the perforations (non-irrigated upper zone of the reservoir), that is, from nadakarni space 7 (see Fig.1 and 2) wells 1 through the upper row of radial holes 6 of the hollow body 5 in the annular space of the inner cylindrical sample of 12 of the piston 9 and further through a number of through holes 13 into the inner space 14 of the pipe 8, where the products of the column of pipes 2 is supplied to the reception of the downhole pump (Fig.1, 2, 3 not shown).

Thus, to shut down the flow of produced fluids from the lower zone of the reservoir, which was bodnaras, and the product is extracted only from the upper non-irrigated zones of the formation.

To disable the upper water-saturated part of the reservoir to the wellhead from the initial position (see Fig.1 and 3) with the wellhead turn the column of pipes 2 and rigidly connected with it by a pipe 8 with the piston 9 relative to the fixed hollow body protiv-clockwise at an angle larger than 60°, corresponding to the length (C=0.1 m) transverse groove 17, for example by 90° and length 0.15 m, then lower the pipe string 2 lengths� greater length a=0.5 m, for example at 0.8 m and then turn the column of pipes 2 and rigidly connected with it by a pipe 8 with the piston 9 in the clockwise direction at an angle larger than 60°, corresponding to the length (C=0.1 m) transverse grooves 17', for example 90° and length 0.15 m.

As a result of the action of the guide pin 18 is moved from the leftmost position up transverse grooves 17" shaped groove 15 through the longitudinal groove 16 in the leftmost position of the transverse grooves 17'" shaped groove 15, with the upper row of radial holes 6 of the hollow body 5 is tightly clipped ring 19 of the piston 9. As a result, the product flow from the upper water-bearing zone of the reservoir, i.e. from nadakarni space 7 of the borehole 1 is disabled.

Next, the flow of products sourced only from the bottom of the perforations (non-irrigated bottom zone of the reservoir), that is, from below the packer and space 11 (see Fig.1 and 2) wells 1 through the lower row of radial holes 10 of the hollow body 5 in the annular space of the inner cylindrical sample of 12 of the piston 9 and further through a number of through holes 13 into the inner space 14 of the pipe 8, where the products of the column of pipes 2 is supplied to the reception of the downhole pump.

Thus, to shut down the flow of produced fluids from the upper zone of the reservoir, which was bodnaras, and the products extracted roofing�from the bottom of a non-irrigated zone of the formation.

The proposed device for disabling the flooded part of the reservoir has a simple design in the work, so as to disable the openings are below the sealing element of the packer eliminates the extraction well pump from the well, also exclude the involvement of additional equipment (pump unit, tank trucks with the process liquid) and equipment (ball) to stop the flow of fluid from below the packer space (lower perforation interval) wells, and this allows to reduce material and financial costs in the operation of the device, and by eliminating destructive elements, srezalsya at rated load, from the construction of the devices when you disconnect the flow of fluid from nadakarni space (upper perforation interval) wells increases the reliability of the device in operation.

In addition, the proposed device to disable the flooded part of the reservoir allows you to extend the functionality, so the device can be operated with any type of pump, and switch the flow of product from the upper and lower perforation interval is axial and rotational movement of a column of pipe from the wellhead.

The device to disconnect flooded part of the reservoir, including lowered into the well pipe string, a packer installed in it from�the flow switch, which is made in the form of a hollow housing with a top row of holes placed above the sealing element of the packer, inside the hollow body concentrically to its axis is a tube, the top is rigidly connected with the column pipe, and the lower part of the piston pipe piston have the possibility of axial movement relative to the hollow body disconnector flow, annular seal, characterized in that the hollow body below the sealing element of the packer in the lower row of holes, the piston is hollow and sealed bottom, and opposite upper and lower rows of holes of the hollow body, the piston has an internal cylindrical sample and a number of through holes, thus in hollow housing above the top row of radial holes made shaped groove in one longitudinal groove and three transverse grooves and the transverse grooves are made of upper, middle and lower parts of the longitudinal groove, and in curly groove of the hollow body for axial and transverse movement is mounted a guide pin rigidly mounted in the piston above its upper inner ring of the sample, and when placing the guide pin in the transverse groove formed from the middle part of the longitudinal groove, the device is arranged to communicate the internal space of the chimney che�ithout a number of through holes of the piston, the inner cylindrical sample, the upper and lower row of holes nadakarni and sub-packer space of the well, and when placing the guide pin in the transverse groove formed from the upper part of the longitudinal groove, the device is arranged to communicate the internal space of the pipe through a series of through holes of the piston, the inner cylindrical sample, the top row of holes nadakarni space wells, while the bottom row of holes of the hollow body is hermetically closed by the piston, and when placing the guide pin in the transverse groove formed from the lower part of the longitudinal groove, the device is arranged to communicate the internal space of the pipe through a series of through holes of the piston, the inner cylindrical sample, the bottom row of holes with sub-packer space of the well, wherein the top row of holes of the hollow body is hermetically closed by the piston.



 

Same patents:

FIELD: oil and gas industry.

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EFFECT: usage of device allows reducing pressure of annular gas notwithstanding temperature and pressure conditions thus increasing life between overhauls for the sucker-rod pumping equipment; besides, this device allows reducing pump-setting depth for the sucker-rod pump due to increase of fluid level over the pump thus reducing consumption of the flow string and pump rods and increasing life between overhauls for the units.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: device comprises well with horizontal section extending over bed with different permeability zones, string with cable, electric valves, pressure and temperature transducers, one or several packers tightly isolating the zones of different permeability. Said transducers are connected with metering assy at well mouth while valves are connected with control unit. Note here that pump for product extraction via annulus is arranged above said valves. Outlets of valves are connected with pipe inner space while inlets, apart from the valve at valve bottom, are connected with annulus. Every valve is composed of encase motor with reduction gear with shaft articulated with pusher. Inner space and case of the latter are filled with lubricant. Ball valve can tightly interact with its seat while cup with inlet channels is arranged under said seat. Note here that inlet of the valve nearby the mouth is communicated with annulus. Ball of every valve is connected by basket with pusher to be displaced therewith. The valves are arranged opposite the well appropriate zone for communication by inlet channels therewith. Inlet channels of every valve are provided with appropriate temperature and pressure transducers+. Valve cups are tightly and rigidly connected with the valve body and provided, apart from the valve nearby the bottom, with lengthwise overflow channels. Body of every valve apart from that nearby the bottom is provided with adapter bush to revolve and to be fixed at transportation position. Pusher inner cavity houses the floating piston and is connected by rod end with technological channels to pipe inner space while head end is connected with space above said pusher.

EFFECT: enhanced performances, independent extraction of products from every interval.

5 dwg

Well testing device // 2545234

FIELD: oil and gas industry.

SUBSTANCE: invention is related to well-flow cut-off systems and may be used for leak test of pipe strings. The device comprises a plug of removable material, which is set in the well pipe for the purpose of the above testing. At that pipe walls have channels (3, 4, 8), which ensure flowing connection between cavity (70) of the well over the plug and cavity (72) below the plug. At that the device comprises a cut-off element designed to ensure continuous closure of the flowing connection. The channel is formed preferably with axial cavity/chamber (4), wherein there is a piston designed to perform readjustment by axial movement from the first position with open flowing connection through the channel to the second position wherein the connection is closed permanently and may be open again.

EFFECT: improved efficiency of the well flow cut-off at leak testing of pipe strings.

10 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: valve includes a body with the upper and lower connection threads, valve saddle fixed rigidly inside the body, thrust bush and washer with central and peripheral openings fixed in body by a locking ring, disc valve with rod passing through the central opening of washer, driving washer and spring installed between washer and driving washer. The rod of disc valve is made hollow with horizontal openings in the upper section connecting the tubing area over the valve with the area below the valve. The driving washer is a stepped one, and its lower part with less diameter forms a sliding friction couple with outer surface of the hollow valve rod. In the upper part of the driving washer with screwed cover and centralisers there are horizontal openings with diameter larger than diameter of openings in the valve rod. In the upper part of the valve rod from outside there is a locking ring and O-rings of elastic material, which are placed at both sides of horizontal openings in the valve rod.

EFFECT: improved efficiency of filter cleaning.

2 cl, 3 dwg

FIELD: machine building.

SUBSTANCE: locking element is made in form of the spherical locking element pressed to the seat with possibility of its movement is equipped by the support elements made in form of the curvilinear legs. The supporting elements are connected with the spherical locking element and support made, for example, in form of the ring with hole for the liquid passage. The locking element is made in form of one part out of viscoelastic, wearproof material, for example, polyurethane.

EFFECT: improved valve operating reliability.

6 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes a housing, a branch pipe with a central duct, openings and an nut, which is concentrically located in the housing, and a spring. The nut is installed on an outer surface of the branch pipe in its part, and the spring is installed between the nut and the housing, in which there is an internal cylindrical recess. In the lower part of the internal cylindrical recess of the housing there are radial ducts. A hollow cylindrical valve provided with an annular projection from above is rigidly attached from below to the branch pipe inserted into the housing with a possibility of restricted leak-proof downward movement of the internal cylindrical recess of the housing. The cavity of the internal cylindrical recess of the housing above the annular projection of the cylindrical valve is interconnected with openings to the central duct, and the cavity of the internal cylindrical recess under the projection is interconnected with radial ducts to the space outside the housing. There is also a replaceable sleeve and a check valve passing in an upward direction. According to the invention, the hollow cylindrical valve below the internal cylindrical recess of the housing is provided with radial openings. Below the radial openings, the cylindrical valve is provided with a replaceable sleeve with through openings from above. A blind rod is installed into the replaceable sleeve and provided from above with a radial through hole, into which a pin is installed, which is inserted in the radial openings of the hollow cylindrical valve and rigidly fixed in the housing. The blind rod has a possibility of restricted back-and-forth axial movements together with the housing relative to the replaceable sleeve with the hollow cylindrical valve with a possibility of cyclic opening and closing of through holes of the replaceable sleeve during pumping of liquid to the device.

EFFECT: possibility of increasing liquid flow rate at pulse pumping to a formation in a formation pressure maintenance system during development of oil deposits.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to mining industry and can be used at drilling and completing of wells. An insulating device for a formation fracturing plug includes a ball seat equipped with a mounting surface and a ball having a possibility of contacting to the mounting surface. The mounting surface profile is dome-shaped; the first portion of the profile has a curvature radius that corresponds to the curvature radius of the ball profile, and the second portion has a curvature radius that is larger than that of the first portion. Besides, the invention describes a fracturing plug and an insulation method of zones of a productive formation using an insulating device.

EFFECT: improvement of tightness of an insulating device.

11 cl, 49 dwg

FIELD: mining.

SUBSTANCE: group of inventions relates to mining industry and can be used in bottom-hole valve systems. The system includes a tubular column and a hollow activation ball. The tubular column is adapted for arrangement in a well and includes a seat. The activation ball is adapted for lowering to the well to be arranged in the seat. The ball includes an outer cover that forms a spherical surface. The outer cover forms a closed volume and is made from metallic material. The activation ball includes a supporting structure located on the inner surface of the outer cover.

EFFECT: improvement of efficiency of a bottom-hole tool activation system.

26 cl, 13 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: valve comprises hollow body with coupling and union threaded ends for coupling with flow string and with radial hole, hollow slide valve with radial bore and piston. Hollow slide valve is arranged off centre relative to said body and rigidly fixed at its outer surface. Radial bores of the body and slide valve are intercommunicated, hollow slide valve being provided with lateral channel. Piston is rigidly secured at rod lower part while rod upper part is provided with outer circular ledge and fitted tightly in adjusting nut for axial displacement relative to adjusting nut. Adjusting nut is screwed in hollow slide inner thread made at its top end. The piston is spring loaded downward from said nut. Fluid chamber communicated with the body inner space is made in said slide valve. Overpressure in said fluid chamber makes piston displace axially upward to communicate said chamber with the well casing annulus via the slide valve lateral channel.

EFFECT: decreased and controlled hydraulic pressure, ease of logging instrument arrangement, combination of several jobs in one lowering of tubing.

1 dwg

Cut-off valve // 2533394

FIELD: oil and gas industry.

SUBSTANCE: cut-off valve is installed in the tubing string over the hydraulic device and consists of a split casing with a hollow plunger is installed in its axial channel with a collar supported by a spring. In the axial channel of the hollow plunger there is a thrust with a bushing installed on it; the bushing has radial openings alternated with axial openings connecting cavity under the hollow plunger over the saddle. In the axial channel there is a bushing with a hollow tube equipped with a disc valve at the end pressed to the saddle by the spring. Between the hollow plunger and the split casing there is a circular chamber coupled hydraulically by a radial opening to the axial channel of the bushing and hollow tube. In the bushing there is a bottom with the central axial channel where a bypass valve is installed with a retainer covering bypass openings in the bottom in initial position and its stroke is limited from bellow by a locking ring.

EFFECT: sealing of the tubing string axial channel from the well cavity at any depth of the well and impact of hydrostatic pressure to the disc valve, filling of the tubing string axial channel by formation fluid at the device running in to the well, opening of the disc valve at excess pressure generation in the axial channel of the tubing string with free passage of hydraulic fluid to the device placed below.

2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: valve has body of steel, throttling assembly, locking assembly with ball and saddle for it. Between locking and throttling assemblies resilient impenetrable wall separating these is mounted fixedly with possible interconnection via U-shaped, turned by its knee upwards, tubular channel, with inner diameter greater than ball diameter, having two branches directed downwards and having various lengths. Elongated pipe branch is connected through open end fixedly placed on wall to hollow of body throttling assembly. Short branch end is placed above wall and is within hollow of locking assembly. Short branch pipe is extended above the knee for distance greater than ball diameter. It is made in form of branch pipe with closed upper end, forming a hollow - tank with stopping device for placement and holding of ball therein in starting position. Ball can possibly fall freely under its own wait in downward direction onto saddle if released by stop as a result of effect from outside force from cementing plug at the end of cementation.

EFFECT: higher reliability, better quality.

7 cl, 8 dwg

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