RU2529069C1 - Device for well beds processing - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: bed processing device comprises through packer and uncoupler. Said uncoupler comprises barrel and slide valve arranged inside said barrel and connected therewith by cut-off elements. Slide valve has seat. Barrel has radial holes and extra cut-off elements. Besides, the barrel is furnished with bypass channel to communicate the barrel top and bottom parts bypassing the slide. In initial position, said bypass channel and radial holes of the barrels are tightly stopped by slide valve. Slide valve has central bore and radial channels. Said radial channels at downward displacement of slide valve relative to barrel can communicate in turns with barrel radial holes and barrel bypass channel. Slide valve lower part has circular groove shaped to ring dents directed opposite the lock ring to interact therewith. Lock ring is fitted in conical groove made at barrel lower part, above extra cut-off elements. Barrel is provided with slide valve stroke limiter arranged under extra cut-off elements. Shutoff element is composed by variable-section rod.

EFFECT: perfected design, enhanced performances, higher reliability.

4 dwg

Description

The invention relates to the oil and gas industry, and in particular to devices for separating formations in a well with separate injection of various reagents.

A device for processing strata in a well is known (patent RU No. 2282710, IPC E21B 33/12, published in Bulletin No. 24 of 08/27/2006), containing a packer including a through-case and an elastic sleeve, an isolator including a trunk with radial channels and internal cylindrical sampling, a spool inserted into the barrel with two rows of radial channels separated by a transverse blind partition, a sleeve installed inside the spool with a seat for the ball that is discharged into the device before processing the second layer, while the upper row is radial the spool channels are opposite the radial channels of the barrel, and the barrel, spool and sleeve are interconnected by differential shear elements, and before processing the second layer, the upper and lower rows of radial channels of the spool communicate with each other by means of an internal cylindrical selection of the barrel, hydraulically connecting the inner space of the tubing with the interior of the packer body, while the device is above the disconnector at a distance from the packer exceeding the thickness of the upper layer is equipped with an additional packer consisting of an upper stop with a cylindrical constriction, a lower stop and an additional elastic cuff mounted on a cylindrical narrowing of the upper stop, which is telescopically mounted with the possibility of axial movement down into the lower stop relative to which the shear element is fixed, while the lower stop is made with the possibility of interaction with an additional elastic cuff, the upper stop is equipped with hydraulic anchors, drawn inward and interacting with the casing onnoy under the pressure created in the interior of the tubing.

The disadvantages of this device are:

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

- secondly, the complexity and high cost of manufacturing both the device itself and the grooves on the outer surface of the packer passage housing;

- thirdly, the limited annular space of the disconnector between the barrel and the spool, and therefore it is impossible to pump a highly viscous chemical composition through this annular space.

A device for treating formations in a well is also known (patent RU No. 2282017, IPC E21B 33/12, published in Bulletin No. 23 of 08/20/2006), comprising a packer including a through-case and an elastic sleeve, an isolator including a barrel with radial channels and internal cylindrical sampling, a spool with two rows of radial channels separated by a transverse blind partition and inserted into the barrel, a sleeve installed inside the spool with a seat for the ball that is discharged into the device before processing the second layer, while the upper row of ial channels of the spool are opposite the radial channels of the barrel, and the barrel, spool and sleeve are interconnected by differential shear elements, and before processing the second layer, the upper and lower rows of radial channels of the spool communicate with each other through an internal cylindrical selection of the barrel, hydraulically connecting the inner space of the tubing pipes (tubing) with the internal space of the packer body, while the device is higher than the disconnector at a distance from the packer exceeding the thickness of the ver the reservoir, equipped with an additional packer, consisting of a cylinder on top and an additional elastic sleeve installed on the base floor connected to the disconnector by means of a coupling, to which the piston is rigidly connected at the top, and a cylinder rigidly connected to the tubing string into which the piston is mounted the possibility of axial movement upward, forming with the piston a cavity hydraulically connected to the interior of the tubing, and the cylinder is made with the possibility New interactions with extra elastic cuff.

The disadvantages of this device are:

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

- secondly, the complexity and high cost of manufacturing both the device itself and the grooves on the outer surface of the packer passage housing;

- thirdly, the limited annular space of the disconnector between the barrel and the spool, and therefore it is impossible to pump a highly viscous chemical composition through this annular space.

The closest in technical essence and the achieved result is a device for treating formations in a well (patent RU No. 2234589, IPC E21B 33/12, published in Bulletin No. 23 of 08/20/2004), containing a packer including a housing, a clip with with slips and a pin, and the pin is installed in a figured groove and has the ability to move along the trajectory of the figured groove, and an elastic cuff, a disconnector, including a barrel and a spool equipped with radial channels, while the packer body is made through in the axial direction, and the disconnector spool is located inside its three trunks, connected with shear elements, is muffled from below and has a smaller diameter on the outer surface above the muffled section, forming a cavity with a barrel communicating through radial channels with the internal space of the disconnector, equipped with a conical bore in which a retaining ring is installed, interacting with the annular a groove located in the lower part of the barrel and a saddle under the locking element, made in the form of a ball, discharged into the device before processing the second layer.

The design disadvantages of this device, which are identified on the basis of experience in its practical application for 8 years, are:

- firstly, the low reliability of the device, due to the fact that during the descent of the device into the well and during the processing of the lower layer, it is possible to deposit dirt, precipitation in the annular space between the spool and the disconnector barrel, as a result of which, when the spool is subsequently moved relative to the barrel, the ring may not be fixed in the annular groove of the disconnector barrel, since it is too low. As a result, it is impossible to hermetically cut off the lower layer and work with the upper layer;

- secondly, it does not allow the processing of formations using viscous chemical compositions such as gel, water-swelling polymer (GNP), etc., this is due to such a design flaw as the small annular space of the disconnector between the barrel and the spool, therefore this annular space is clogged with a highly viscous chemical composition and is not further pressed through, in connection with which the device does not further fulfill its functions, which narrows the technological capabilities of the device;

- thirdly, in the process of sequentially processing two layers after working with the upper layer, it becomes necessary to return to the lower layer for technological work with it, but this device does not allow this in view of the imperfection of the design;

fourthly, the locking element, made in the form of a ball, does not allow hermetically to cut off the lower layer when swabbing the upper layer, for example, when cleaning the upper layer from the reaction products of an aqueous solution of acids, since the ball will rise up and pass from the lower layer.

The objectives of the invention are to improve the design of the device, increasing the reliability of the device, expanding the technological capabilities of the device and tight cutoff of the lower layer during swabbing of the upper layer.

The problem is solved by a device for treating formations in a well containing a feedthrough packer and disconnector, including a barrel, a spool located inside the barrel and connected to it by shear elements, the spool is equipped with a seat for a shut-off element that is discharged into the device before processing the upper layer, a conical bore, in which has a circlip interacting with an annular groove.

New is that the barrel is equipped with radial holes and additional shear elements, the fracture force of which is higher than the shear element fracture force, also the barrel below the radial holes is equipped with a bypass channel that can communicate with the upper and lower parts of the barrel, bypassing the spool, while the bypass is in the initial position the bore and radial openings of the barrel are hermetically sealed by a spool equipped with a central axial bore and radial channels, and the radial channels of the spool with axial displacement downward pressure of the spool relative to the barrel under the influence of excessive pressure are able to alternately communicate first with the radial holes of the barrel, and then with the bypass channel of the barrel, while the annular groove is made in the lower part of the spool in the form of annular notches directed opposite to the retaining ring with the possibility of interaction with it, moreover, the retaining ring is placed in a conical bore made in the lower part of the barrel above the additional shear elements of the barrel, while below the additional shear elements The barrel is equipped with a spool stroke limiter, and the locking element is made in the form of a rod of variable cross-section, which can be fixed in the spool after landing on the spool seat.

Figure 1, 2, 3 schematically shows the proposed device in longitudinal section in the process.

Figure 4 shows the spool in a position fixed relative to the barrel.

A device for processing formations in the well consists of a through packer and disconnector 1 (see figure 1). The disconnector 1 is attached to the packer (not shown in FIGS. 1, 2, 3, 4) from above, i.e. the barrel 2 (see FIG. 1) of the disconnector 1 from below by means of a sleeve (not shown in FIGS. 1, 2, 3, 4) is connected to the housing of the feedthrough packer. As a packer, a pass-through packer of any known design is used, for example, the PRO-NMO2 packer manufactured by NPF Packer (Oktyabrsky, Republic of Bashkortostan, Russian Federation).

The spool 3 (see figure 1) is located inside the barrel 2 and connected to it by shear elements 4. The spool 3 is equipped with a seat 5 (see figure 2) for a locking element made in the form of a rod of variable cross section 6, discharged into the device before processing the upper layer (in figure 1, 2, 3, 4 not shown).

The barrel 2 (see figures 1 and 2) is equipped with radial holes 7 and additional shear elements 8, the fracture force of which is higher than the fracture force of the shear elements 4.

The fracture of shear elements 4 and additional shear elements 8 is provided by the creation of excess hydraulic pressure inside the device above the spool 3. For example, the destruction of shear elements 4 occurs under the influence of excess hydraulic pressure equal to 4 MPa, and the destruction of additional shear elements 8 occurs under the influence of excessive hydraulic pressure equal to 10 MPa. It should be borne in mind that the value of the excess hydraulic pressure at which the destruction of additional shear elements occurs must be higher than the processing pressure of the lower layer (not shown in Figs. 1, 2, 3, 4), i.e. in this case, less than 10 MPa, for example 9.0 MPa.

The barrel 2 (see figure 1) is equipped with a bypass channel 9, with the ability to communicate the upper and lower parts of the barrel 2, bypassing the spool 3.

In the initial position, the bypass channel 9 and the radial holes 7 of the barrel 2 are hermetically closed by a spool 3 equipped with a central axial hole 10 and radial channels 11. The throughput (Q ₁ ) of the central axial hole 10 of the spool 3 is determined by the dimensions of its cross section, which is determined empirically based from the estimated viscosity of the injected chemical reagent, for example, a central axial hole 10 of the spool 40 mm in diameter is made.

In comparison with the prototype, by eliminating the annular space between the spool and the disconnector barrel from the device design, the device's throughput increases, and it allows both processing and cleaning of two layers with highly viscous compositions in one run of the equipment.

The radial channels 11 of the spool 3 with an axial downward movement of the spool 3 relative to the barrel 2 under the action of excessive pressure are able to alternately communicate first with the radial holes 7 of the barrel 2, and then with the bypass channel 9 of the barrel 2.

An annular groove 12 is made in the lower part of the spool 3 in the form of annular notches (see Fig. 4) directed opposite to the retaining ring 13 with the possibility of interaction with it.

The retaining ring 13 is placed in a conical bore 14, made in the lower part of the barrel 2 above the additional shear elements of the barrel 8.

Below the additional shear elements 8, the barrel 2 is equipped with a stroke limiter 15 of the spool 3. The stroke limiter 15 of the spool 3 is made in the form of an internal annular selection.

The rod of variable cross section 6 can be fixed by means of a retaining ring 16 in the spool 3 after landing on the seat 5 of the spool 3. The retaining ring 16 is placed in the annular groove 17 made on the inner surface of the spool 3.

The retaining rings 13 and 16 are made split spring. In order to exclude unauthorized fluid flows, the mating surfaces of the spool 3 are provided with sealing elements (Figs. 1-4 are shown conditionally).

The device operates as follows.

The device (packer + disconnector 1) (see figure 1) assembled on a pipe string (not shown in figures 1, 2, 3, 4) is lowered into the well to the required depth and installed between the upper and lower layers, which are necessary handle. Then, the packer is packaged (planted), for example, it is raised by 1.5 m and lowered. As a result, the packer hermetically separates the annular space of the well between two processed formations.

After that proceed to the processing of the lower layer (figure 1, 2, 3, 4 not shown). To do this, a reagent, for example, a 15% aqueous solution of hydrochloric acid through a pipe string through the central axial hole 10 (Fig. 1) of the spool 3, the barrel 2 of the disconnector 1 and the housing of the feedthrough packer is pumped into the lower layer and allowed to react, while the bypass channel 9 remains hermetically sealed with a spool 3. Apply synthetic hydrochloric technical acid (BUT) according to GOST 857-95.

After exposure, swabbing is performed by lowering the level, while shear elements 4 (Fig. 1) motionlessly fix the spool 3 relative to the barrel 11 of the disconnector 1.

Then proceed to the processing of the upper layer. For this, a rod of variable cross-section 6, (FIGS. 2 and 3), which seals on the saddle 5 and closes the central hole 10 (see FIG. 1) of the spool 3, is dropped inside the device along the pipe string, 3 in the pipe string and in the spool 3 of the device (see figure 3) above the rod of variable cross section 6 increase the pressure using a pump unit, for example cementing unit CA-320.

As a result, the variable-section rod 6 first moves downward relative to the spool 3 and seals hermetically on the seat 5. The variable-section rod 6 stops moving when the variable-section rod 6 abuts against the end face of the seat 5, and the variable-section rod 6 is locked by the locking ring 16, located in the annular groove 17 of the valve 3 (see figure 2).

Further, the pressure in the device above the spool 3 continues to increase and when the pressure reaches 6 MPa, the shear elements 4 are destroyed, the spool 3 moves down relative to the barrel 2 of the disconnector 1.

The retaining ring 13 (see Fig. 2 and 4) enters the annular notches 12 of the spool 3 and along it moves down to the interaction of the lower end of the spool 3 (see Fig. 2) with additional shear elements 8 and is fixed in this position (see figure 2), while the bypass channel 9 remains a hermetically sealed spool 3, and the radial channels 11 of the spool 3 are aligned with the radial holes 7 of the barrel 2.

The retaining ring 13 is placed in the conical bore 14, made in the lower part of the barrel 2 above the additional shear elements of the barrel 8, which ensures reliable fixation of the spool 3 relative to the barrel 2 of the disconnector 1 after contacting the lower end of the spool 3 with additional shear elements 8 and allows guaranteed to seal off the lower layer and work with the upper layer, which undoubtedly increases the reliability of the device as a whole.

After that, the reagent is pumped through the pipe string (see FIG. 2) through the radial channels 10 of the spool 3 and the radial holes 7 of the barrel 2 of the disconnector 1, for example, hydrocarbon solvent is pumped into the upper formation and allowed to react. Hydrocarbon solvent is injected into the upper reservoir under a pressure of not more than 10 MPa, for example, under a pressure of 9 MPa, since with an excess hydraulic pressure of 10 MPa, additional shear elements 8 are destroyed. For example, Nefras A-130/150 is used as a hydrocarbon solvent ( GOST 10214-78).

After exposure, as in the lower layer, swabbing is performed by lowering the level, while the movement of the spool 3 relative to the barrel 2 of the disconnector 1 is eliminated by fixing the retaining ring 13 in the annular notches 12 of the spool 3.

Further, in order to return to the lower layer for any technological operation, for example, to determine the injectivity of the lower layer in the pipe string and in the device above the spool 3, the pressure is increased using a pump unit, for example, cementing unit ЦА-320, and when the pressure reaches 10 MPa additional shear elements 8 are destroyed, the spool 3 moves down even lower relative to the barrel 2 of the disconnector 1, while the retaining ring 13 (see FIGS. 2 and 3) continues to be in the annular notches 12 of the spool 3 and along them moves down to the lower end interaction (not shown in FIGS. 1, 2, 3, 4) of the spool 3 (see FIG. 3) with the stroke limiter 15 of the spool 3. As a result, the retaining ring 13 is fixed in the annular notches 12 of the spool 3 in the lower position (see figure 3).

As a result, the radial channels 11 of the spool 3 are hermetically disconnected from the radial holes 7 of the barrel 2 and communicate through the bypass channel 9, hydraulically connecting the upper and lower parts of the barrel 2, bypassing the spool 3 with the lower layer.

Then pumped technological fluid, for example, fresh water with a density of 1000 kg / m ³ through the pipe string through the bypass channel 9 into the lower layer and determine its injectivity.

Next, the packer is unpacked. To do this, the pipe string is raised by 1.5 m and the packer takes its original position, and the device is ready for removal. Then the pipe string with the device is raised to the surface.

The proposed design of the device allows for the sequential processing of two layers after carrying out work with the upper layer again to return to the lower layer for technological work with him, which allows to expand its technological capabilities. In addition, the device allows hermetically to cut off the lower layer while swabbing the upper layer.

The proposed device has an improved design, advanced technological capabilities and high reliability.

Claims (1)

A device for treating formations in a well containing a feedthrough packer and disconnector, including a barrel, a spool located inside the barrel and connected to it by shear elements, the spool is equipped with a seat for a locking element that is discharged into the device before processing the upper layer, a conical bore in which the retainer is installed a ring interacting with an annular groove, characterized in that the barrel is equipped with radial holes and additional shear elements, the fracture force of which is higher than the fracture force of the shear elements, also the barrel below the radial holes is provided with a bypass channel that can communicate with the upper and lower parts of the barrel, bypassing the spool, while in the initial position the bypass channel and the radial holes of the barrel are hermetically closed by a spool equipped with a central axial hole and radial channels, when the spool is axially moved down the spool relative to the stem under the action of excessive pressure, they can alternately communicate with the radial holes first the barrel, and then with the bypass of the barrel, while the annular groove is made in the lower part of the spool in the form of annular notches directed opposite to the retaining ring with the possibility of interaction with it, and the retaining ring is placed in a conical bore made in the lower part of the trunk above the additional shear elements of the barrel, while below the additional shear elements the barrel is equipped with a stroke limiter, and the locking element is made in the form of a rod of variable cross-section, with the possibility of fixing after landing in the spool on the spool seat.

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