RU2351747C1 - Device for pressurisation of tube space - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry and it is implemented at stabilisation of wells and is designed for pressurisation of tube space. The device consists of a cylinder case, and of a bushing with upper and lower side apertures; a partition equipped with seats is located between the side apertures. A cone with the central aperture is installed on the upper end of the bushing, while the lower end is made conic. The invention facilitates reliability of this device operation in casing tube string of any size. Also there is achieved decreasing of device dimensions, capability of device application in combination with any other elements, accuracy of determination of completion moment at forcing grout mix through without using a squeezing plug, simplification of device internal parts drilling out at putting the well into operation.

EFFECT: decreasing of device dimensions, capability of device application in combination with any other elements, accuracy of determination of completion moment at forcing grout mix through without using squeezing plug, simplification of device internal parts drilling out at putting well into operation.

1 cl, 2 dwg

Description

A device for sealing a pipe space refers to the oil and gas industry, is used for fastening wells and is designed to seal the pipe space in the layout of the bearing and countersunk columns with different internal diameters.

A device for blocking the internal cavity of the pipes in the well according to A.S. SU No. 1802081, ЕВВ 33/124, comprising a hollow body, an expansion plug and a rod, a sealing element with an axial channel for an expansion plug and a hydraulic drive unit for moving the rod with an expansion plug and packing the sealing element.

Known packer for overlapping the inner cavity of the pipe string according to patent RU No. 2082870 C1, E21B 33/12, publ. 06/27/1997, including a hollow body with a hydraulic chamber, an expansion plug, a rod rigidly connected to it and a sealing element with an axial channel for an expansion plug made with gear cutting.

Both devices are complex structurally. The presence of a hydraulic drive unit in order to open the sealing element at the packer, with gear cutting on the spacer plug, makes it impossible to create high pressure, because for any hardness of rubber on the sealing element, the cork is squeezed out during work on the well, and the tightness of the seal is broken.

Closest to the proposed technical solution is the "Device for cementing wells" according to A.C.SU No. 1546614, ЕВВ 33/14, from 01.04.87, publ. 02/28/1990, comprising a housing with a conical groove for the retaining ring, a glass with a bottom mounted in the housing with the possibility of axial movement and fixed in the upper position relative to the housing with shear screws, made with side circulation channels. The holes are blocked by dispersed material with balls and, with the pressure drop created, the glass with the bottom cuts off the screws, moves and fixes in the lower position, sealing the pipe space during cementing of the well.

To limit the stroke of the nozzle, the internal diameter of the device is reduced, which makes it difficult to drill inside the column in preparation for well operation.

Such a device, when putting a well into operation, is difficult to drill due to the presence of internal metal parts, due to their hardness and the possibility of rotation.

If the density of the balls is higher than the density of the cement slurry, they will fall rapidly and prematurely close the device with cement left in the string, and at a low density, it may float up into the casing, where other tooling elements are clogged with balls, for example, step cementing couplings and reservoir separation devices.

The objective of the proposed technical solution is to create a device for overlapping and sealing the pipe space of the descent string, providing control over the operation of the devices included in the layout of the countersunk string, increasing the reliability of the device and ensuring the tightness of the pipe space with different internal diameters in the bearing and countersunk columns, in casing strings of any size of oil pipes.

The problem is solved due to the device for sealing the tube space, which contains a cylindrical body, a sleeve made with upper and lower lateral circulation openings, mounted in the housing with axial movement, while a baffle is placed in the sleeve located between the lower circulation openings and the upper circulation with holes provided with landing seats, a cone with a central hole is installed on the upper end of the sleeve, and the lower end of the sleeve is made to nical.

The installation of a cone with a central hole on the upper end of the sleeve, together with the provision of upper circulation holes for the seat seats, makes it possible to use the device for sealing the tube space in combination with any other elements of technological equipment, with the exception of the inclusion of sealing balls in this equipment and disruption of its operation.

Placing a sleeve with a baffle made with upper and lower lateral circulation holes, mounted in the housing with the possibility of axial movement, in conjunction with a cone with a central hole and upper circulation holes, equipped with landing seats, eliminating the entry of sealing balls into this equipment and disruption of its operation allows determine the moment of completion of the forcing of cement mortar without the use of a squeezing plug, which allows to reduce the size of the device.

The implementation of the lower part of the cone-shaped sleeve ensures jamming of the sleeve and simplifies drilling without turning the internal parts of the device during commissioning.

A device for sealing the tube space is shown in the drawings, in which Fig. 1 shows a device before actuation, in Fig. 2 - after actuation.

Figure 1 and figure 2 shows: housing 1, circlip 2, tapered groove 3, sleeve 4, baffle 5, shear screws 6, upper circulation holes 7, seat seats 8, lower circulation holes 9, sealing balls 10, thin-walled cone 11, central hole 12, conical protrusion 13.

A device for sealing the pipe space is as follows. The device (figure 1, 2), comprises a housing 1 with a conical groove 3 for the retaining ring 2, a sleeve 4 with a partition 5 located between the upper 7 and lower 9 circulation holes, mounted in the housing 1, with the possibility of axial movement to the conical protrusion 13, and fixed in the upper position relative to the housing 1 on shear screws 6.

In the walls of the sleeve 4 above the partition 5 there are upper circulation holes 7 provided with seats 8 for seating the sealing balls 10, and under the partition 5 there are lower circulation holes 9. The lower part of the sleeve 4 is made in the form of a cone with an angle from 5 ° to 10 °. A thin-walled cone 11 with a central hole 12, the diameter of which is larger than the diameter of the sealing balls, is installed at the upper end of the sleeve.

A device for sealing the pipe space works as follows.

The device is installed in the shoe of the descent column or above the filter and is used in combination with any other elements of technological equipment, with the exception of the inclusion of sealing balls in this equipment and disruption of its operation.

After the descent of the column and installation of the device in the required interval, the well is washed, a viscoelastic composition with sealing balls 10 is introduced into the column in an amount greater than the number of upper circulation holes 7 provided with landing seats 8.

A thin-walled cone 11 with a central hole 12 mounted on the upper end of the sleeve prevents the float of balls in high density drilling and cement mortars and disruption of the rest of the equipment.

After the balls 10 are planted in the seat saddles 8, the upper circulation openings 7 are closed, the pressure rises to cut off the screws 6 holding the sleeve 4, which moves all the way and, due to its taper, is jammed in the conical protrusion 13. The device seals the pipe space with the partition 5 in the necessary the moment of time and at the same time is the check valve of the column due to the fixing of the sleeve 4 with the baffle 5 from the return stroke by the retaining ring 2 when the difference in hydrostatic pressure in the pipe and annulus well bore.

The tightness is checked by reducing the pressure to hydrostatic and the absence of overflow from the column of injected liquid over the compression volume.

Drilling of the internal parts of the device after completion of work is carried out without turning the parts of the device, due to jamming of the lower conical part of the sleeve 4 in the conical protrusion 13 with a taper of 5 ° to 10 °.

The technical result of the proposed technical solution is to ensure, when overlapping and sealing the pipe space of the descent string, the reliability of the device in casing strings of any size of oil grade pipes with different internal diameters, in the carrier and the descent string, reduce the size of the device, use the device to seal the pipe space in combined with any other elements of technological equipment, the accuracy of determining the moment of completion of the cement punching solution, without the use of a squeeze plug, and simplifying the drilling of the internal parts of the device when putting the well into operation due to the installation of a sleeve with axial movement of the sleeve, the location of the baffle in the sleeve, between the upper and lower lateral circulation holes, the installation of a cone with a central hole in conjunction with the supply of landing seats of the upper circulation holes of the sleeve, and the implementation of the lower part of the sleeve conical.

Claims (1)

A device for sealing a tube space comprising a cylindrical body, a sleeve made with upper and lower lateral circulation openings, mounted in the housing with axial displacement, characterized in that a baffle is located in the sleeve located between the lower circulation openings and the upper circulation openings provided with landing saddles; a cone with a central hole is installed on the upper end of the sleeve, and the lower end of the sleeve is made conical.

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