Device for isolation operations in wells

FIELD: oil industry.

SUBSTANCE: device has body with radial apertures, two compacting assemblies thereon and valve assembly between them. Each compacting assembly comprises a collar, stopping branch pipe, cylinder, forming a ring-shaped hollow with the body, wherein a bushing is placed. In upper compacting assembly ring-shaped hollow is covered by plug from lower side, which is fixed in cylinder and interacts with collar, cylinder is connected to body by cams, placed in radial apertures of plug and in ring groove of body, bushing is made stepped, long step of which interacts with cams and is fixed by shear screws from displacement in ring plane, which is connected to well. In lower compacting assembly bushing is provided with holder, on the body a cone is mounted, interacting with sockets, placed in grooves of stopping branch pipe, which is fixed on the body by shear screws.

EFFECT: higher reliability.

2 cl, 4 dwg

 

The invention relates to the field of oil and gas industry, namely, devices for insulation work in wells, including selective injection of insulating materials in the elimination of cross-flows, shutoff, recovery of casing tightness, and spacerace casing packer installed on perforated casing, the completion, including razvetvlenno horizontal multilateral wells.

A device that includes a housing and placed it two sealing unit and the valve unit between them [1].

The disadvantage of this device lies in the complex design of each sealing unit and relatively low reliability.

Closest to the invention is a device comprising a body placed in it two sealing unit and the valve unit between them, each of the sealing units contains the cuff, the thrust nozzle, a cylinder forming with the casing an annular cavity in which is placed the nut [2].

The disadvantage of this device is that even when short-term excess pressure in the housing sealing units repatriate and insulation (cement) mortar in the horizontal well will flow through the annular space to the left and right of the device is TBA, consequently, there is a strong likelihood that the column pipe 26 is attached to the hardened insulation (cement) mortar.

The pressure in the string of pipe 26 cannot be ruled out in the injection process, the insulating solution into the well bore due to unforeseen accidents at the well (gust in threaded connection hydroblast from the wellhead to the cementing unit, the destruction of the valve system in the unit and so on).

The technical result of the invention is to improve reliability of the device.

Required technical result is achieved in that the device for insulation work in a well includes a housing with radial holes, posted two sealing unit and the valve unit between them, each of the sealing units contains the cuff, the thrust nozzle, a cylinder forming with the casing an annular cavity in which is placed a sleeve, according to the invention in the top o the node ring cavity is blocked from the bottom of the tube, which is fixed in the cylinder and communicates with the sleeve, the cylinder connected to the housing of Cams placed in the radial holes of the tube and the annular groove of the housing, the sleeve is made step, long step which interacts with Cams and fixed shear screws from moving in the annular cavity to ora communicated with the bore, and at the bottom o node, the sleeve is provided with a lock, the casing has a cone interacting with slipcase placed in the grooves of the thrust nozzle, which is fixed on the casing shear screws.

The proposed device is illustrated in the drawings, figure 1-4.

Figure 1 shows a General view of the device in the transport position.

Figure 2 - device for the circulation of fluid, the creation of pressure and spacerace o node.

Figure 3 - the device if spacerace upper sealing unit and the injection of the insulating material in the annulus of the well under pressure.

Figure 4 - device after respitrace upper and lower sealing units for the sequential discharge of the excess pressure in the device and axial tension in the pipe string on which the device is installed in the well.

The device comprises (1) from the upper sealing unit "A"valve block "B", the lower sealing unit "C" and valve "D", which include the composite casing 1 with radial holes 2, 3, 4, cylinder 5 with a radial hole 6, a sleeve 7, the tube 8, the cuff 9, shear screws 10, the Cams 11, the thrust nozzle 12, a spring 13, a sleeve 14 with holes 15, the coupler 16, the cylinder 17, the sleeve 18 with the latch 19, the cuff 20, the cone 21, the spring 22, the thrust nozzle 23 from slips and 24 and shear screws 25.

Sealing of the contact surfaces between the parts of the device is ensured by rubber o-rings, shown in figure 1-4.

The device operates as follows.

The device goes down on the string of pipe 26 in the casing 27 with radial holes 28 for injection of the insulation material in the annulus of the well. When lowering the device into the well column pipe 26 is filled with fluid from the well through the check valve "D".

The string of pipe 26 create excessive pressure in the device, in which there is spacerowa lower sealing unit With latching sleeve 18 in the cylinder 17, and the cut of the screws 10 and moving the sleeve 7 up to release Cam 11, the retaining tube 8 in case 1 (figure 2). With the increase of excess pressure in the valve device is opened the site and observed the circulation of fluid from the tubing 26 to the annular space.

Excessive pressure drop and unload some of the weight of the column of pipes 26 to the device. When the cylinder 5 with the tube 8 compress the cuff 9 and spacerowa her in the casing 27 (figure 3).

After you install the device (spacerace upper and lower sealing units) on the string of pipe 26 is injected insulation solution, through which valve the node b and the radial holes 28 on sudnay columns 27 enters the annulus of the well to eliminate cross-flows, limiting water inflow into the borehole, restore the tightness of the casing, etc.

After the end of the insulation works well excessive pressure drop and pull the string of pipe 26 to the axial force sufficient to shear the screws 25.

This rapacuronium upper sealing unit "A", and then, after cutting screws 25, the lower seal Assembly. Backwashing through the annular space through the valve "D" wash away the remnants of the insulating material of the annulus and the tubing 26 (figure 4). Valve design "D" should provide a reliable, including horizontal wells wells.

When removing the device from the well flow of fluid from the pipe string 26 is provided through the hole 6 in the cylinder 5.

Sources of information

1. Patent No. 2010947, 1994

2. Patent No. 2095541, 1994

Device for insulation work in a well, comprising a housing with radial holes, posted two sealing unit and the valve unit between them, each of the sealing units contains the cuff, the thrust nozzle, a cylinder forming with the casing an annular cavity in which is placed a sleeve, characterized in that the upper o-node ring cavity is blocked from the bottom of the tube, which is fixed in the cylinder and the EOI is modestum with cuff, cylinder connected to the housing of Cams placed in the radial holes of the tube and the annular groove of the housing, the sleeve is made step, long step which cooperates with Cams and fixed shear screws from moving in the annular cavity which is communicated with the bore, and the lower sealing the node sleeve provided with a lock, the casing has a cone interacting with slipcase placed in the grooves of the thrust nozzle, which is fixed on the casing shear screws.



 

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