RU130624U1 - PACKER DRILLED - Google Patents

Abstract

The packer is drillable, comprising a hollow cylindrical barrel with a sealing element installed on it, upper and lower cones, the outer surfaces of which are in contact with the upper and lower grippers, respectively, characterized in that grooves are made on the outer surface of the barrel in contact with split snap rings installed in the upper cone , a landing sleeve is installed in the lower part of the barrel for a resettable stopper, and a saddle is installed on the lower end of the packer on split calibrated screws ball valve.

Description

The utility model relates to equipment for arranging oil and gas wells and is intended to be installed in oil and gas wells to separate annulus and grout grout when isolating absorption zones.

Known drillable packer adopted for the prototype (Patent of the Russian Federation for the invention No. 2296853, IPC ЕВВ 33/12, published 02/14/2005), containing a barrel with a threaded thread on the outer surface, a sealing element mounted on the barrel, an upper and lower cone, upper and the lower grippers that are connected with the cones, a split nut installed in the upper cone, which has a threaded thread on the inner surface and a threaded thread of the cone on the outer surface. The packer is additionally equipped with a stop located in the lower part of the barrel and representing a cork or cork with a body.

The disadvantages of this device are:

- the impossibility of pumping cement slurry through it to isolate the absorption zones;

- displacement of drilling fluid from the well during the descent of the packer on the drill pipe string.

The claimed solution solves the following problems:

- providing the possibility of its use not only as a plug-packer, for tight separation of sections of the wellbore, but also for supplying cement slurry through it when carrying out isolation of absorption zones;

- filling the internal volume of the drill pipe string when lowering the packer;

- simplifying the design of the unit for fixing the elements of the packer in the working position after its installation.

The objectives are achieved in that, new in the design of the packer drilled, containing a hollow cylindrical barrel with a sealing element mounted on it, upper and lower cones, the outer surfaces of which are in contact with the upper and lower grippers, respectively, is that grooves are made on the outer surface of the barrel in contact with split snap rings installed in the upper cone, a landing sleeve is installed in the lower part of the barrel for a resettable stopper, and at the lower end e packer, on split calibrated screws, a ball valve seat is installed.

Figure 1 shows a General view of the packer drilled in its original (transport) state.

Figure 2 - General view of the packer upon completion of the installation process in the well.

Figure 3 is a General view of the installed in the well packer with open for supplying cement slurry through passage channel.

Figure 4 is a General view of the packer with a stopper installed in it.

The drillable packer (Fig. 1) consists of a hollow cylindrical barrel 1 with threads made at its ends (not indicated in the drawing): an internal trapezoidal for connecting to the installation tool - at the upper (sleeve) end and an external pipe - at the lower end. Grooves 2 are made on the outer surface of the barrel and a sealing element 3 is installed, made in the form of one or several cuffs having different hardness, the ends of which abut against the upper 4 and lower 5 cones. On the inner surface of the upper cone 4, annular grooves 6 are made, into which split retaining rings 7 are mounted, fixing the upper cone from axial movements after crimping the cuff. On the outer conical surfaces of the cones, grippers are installed - upper 8 and lower 9, each of which is an anchor calibrated for a given breaking force. The lower grip abuts with its end against a guide shoe 10 mounted on the lower end of the barrel. From the lower end, a bushing 11 is inserted into the barrel, fixed from axial movement by a nut 12, on which, with the help of screws 13 calibrated for a given breaking force, a ball valve seat 14 is fixed. The tightness of the connection of the saddle with the nut is ensured by a rubber sealing ring 15. All parts of the packer are made of easily drilled materials (aluminum alloys, rubber).

Drillable packer works as follows.

The packer connected by means of a thread made at the upper end of the barrel to a mounting tool (not shown) is lowered into the well to a predetermined depth on a string of drill or tubing, and due to the presence of a through passage, the flushing fluid filling the well enters the in-tube space rather than being squeezed out of the well.

When the packer reaches a predetermined depth, the ball 16 is reset (Fig. 2), which, having reached the seat 14 of the ball valve, blocks the flow channel of the packer. Inside the column, pressure is created, the pusher of the hydraulic cylinder of the installation tool (not shown) acts on the end surface of the upper gripper 8, as a result of which the gripper with the upper cone 4 is shifted down, the sealing element 3 is deformed, partially blocking the annulus. When the specified pressure in the hydraulic cylinder of the installation tool is reached, the upper gripper 8 breaks, its segments cut into the borehole walls, fixing the packer from upward movements. After which, without relieving pressure, the pipe string creates upward tension of the barrel 1, all the elements of the packer, with the exception of the upper grab 8 and the upper cone 4, are displaced upward, the sealing element 3 is deformed, ensuring the separation of the downhole sections. Upon reaching a predetermined amount of force, the lower grip 9 breaks, its segments cut into the walls of the well, split retaining rings 7 fix all the elements of the packer from returning to its original position. Packer installation completed.

Upon completion of the installation operation of the packer, the in-pipe pressure is raised to the calculated value, while the calibrated screws 13 break, the ball valve consisting of a seat 14 and ball 16 falls onto the bottom, releasing the flow channel of the packer to supply grouting mortar to isolate the absorption zones (Fig. 3 )

After pumping the required volume of grouting mortar, a shut-off plug 17 is inserted, which is installed in the landing sleeve 11, isolating from each other sections of the well above and below the packer (Fig. 4).

Upon completion of the insulation work, the installation tool, by rotating the pipe string to the right, is undocked from the packer and, together with the pipe string, is removed from the well, the cement bridge and the packer are drilled in advance.

Thus, a new set of essential features of the proposed solution allowed:

1. To ensure the filling of the internal volume of the pipe string during the descent of the packer.

2. To ensure the supply of cement slurry through the internal flow channel to isolate the absorption zones, followed by separation of the well sections above and below the packer.

3. To simplify the design of the unit for fixing the elements of the packer in the working position after its installation.

Claims (1)

The packer is drillable, comprising a hollow cylindrical barrel with a sealing element installed on it, upper and lower cones, the outer surfaces of which are in contact with the upper and lower grippers, respectively, characterized in that grooves are made on the outer surface of the barrel in contact with the split retainer rings installed in the upper cone , a landing sleeve is installed in the lower part of the barrel for a resettable stopper, and a saddle is installed on the lower end of the packer on split calibrated screws ball valve.

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