RU63847U1 - DEVICE FOR DELIVERY OF A GRINDING MIXTURE TO A WELL - Google Patents

Abstract

The proposal relates to the oil and gas industry and can be used when drilling or repairing wells to install a cement or sand bridge in a given interval of the well.

A device for delivering cement slurry to the well comprises a bailer, a removable lid with a sealing element, the removable lid located at the bottom of the bailer and connected to the bailer by a shear element.

From above, a tip is screwed into the baffle, in which through holes are made. A self-sealing cuff is installed on the outer surface of the tip, letting it pass from bottom to top.

A cuff is installed inside the chute above the grouting mixture. In addition, the removable cover on the bottom is equipped with an additional cuff. Rigid centralizers are installed on the outer surface of the bobbin.

The proposed device for the delivery of grouting mixture into the well allows you to empty the bulk material delivered to the well in any of its interval, in addition, the presence of an additional cuff allows you to increase the tightness of the material delivered to the specified interval of the well.

1 ill. for 1 liter

Description

The proposal relates to the oil and gas industry and can be used when drilling or repairing wells to install a cement or sand bridge in a given interval of the well.

A device is known for delivering components of a mixture to a well (copyright certificate No. 1165767, IPC 7 ЕВВ 33/132, published in Bulletin No. 25 of 07/07/1985), comprising a housing, a container for the main component, a container for the accelerator placed in it setting and closure, a drain pipe for the setting accelerator with a cotter pin inserted into it, a container for the main component of the mixture, which is placed under the container for the setting accelerator and made with a side hinged lid on hinges, while the shutter is made with an earring for the cotter pin anda locking outer collar under the side hinged lid, while the side hinged lid is spring-loaded relative to the fixed wall of the container for the main component.

The disadvantages of this design are:

- firstly, the complexity of the design in the work requiring a certain sequence of operation of nodes and parts depending on each other;

- secondly, the complexity of manufacturing, due to the large number of technically complex parts, which leads to an increase in the cost of the structure as a whole.

The closest in technical essence and the achieved result to the proposed one is a device for the delivery of bulk materials into the well (RF patent for utility model No. 43300, IPC 7 ЕВВ 27/02, published in bulletin No. 1 dated January 10, 2005), containing a choke with a removable lid located in the bottom of the choke, while the lid is fixed by balls located in its nests, held by the inner surface of the movable sleeve, which has pockets in the lower part for the balls to enter them when the sleeve is forced to move to remove free a lid, the lid is fixed to the sleeve by a flexible connection, while the outer surface of the bailer is equipped with rigid centralizers, and a cuff is installed inside the bailer after filling it with bulk material, the lid is equipped with a sealing element and a tip is screwed onto the bailer, in which through holes through which the inside of the bobbin above the cuff

it is filled with borehole fluid during the descent of the device into the borehole, in addition, the borehole fluid creates additional pressure on the cuff during emptying of the baffle.

The disadvantages of this device are:

firstly, the device is triggered only when the movable sleeve stops in the bottom or previously delivered bulk material and does not allow to empty the delivered material in any interval of the well;

secondly, the low tightness of the device, since it is possible to prematurely empty the delivered material (for example, grouting mixture) into the well during the descent of the device, which seeps into the well from the bottom of the bunker.

The technical task of the utility model is the possibility of emptying the material delivered to the well in any interval, as well as increasing the tightness of the material delivered to the well.

The technical problem is solved by the proposed device for the delivery of grouting mixture into the well, containing a chipper, a removable cover located in the bottom of the chipper, a cuff installed inside the chipper, a tip with through holes screwed on top of the chipper, rigid centralizers, and a sealing element.

What is new is that a self-sealing cuff is installed on the outer surface of the tip, letting it pass from bottom to top, while the removable lid from the bottom is equipped with an additional cuff, and the removable lid with a shear element is connected to the bobbin.

The figure shows the proposed device for the delivery of bulk materials into the well in longitudinal section.

A device for delivering cement slurry to the well comprises a bailer 1 (see FIG.), A removable lid 2 with a sealing element 3, the removable lid 2 located at the bottom of the bailer 1 and connected to the bailer by a shear element 4.

A tip 5, in which through holes 6 are made, is screwed on top of the chipper 1. A self-sealing cuff 7 is installed on the outer surface of the tip 5, which allows it to pass from bottom to top. A cuff 9 is installed inside the flap 1 above the grouting mixture 8. In addition, the removable cover 2 is provided with an additional cuff 10 on the bottom. Rigid centralizers 11 are installed on the outer surface of the flap 1.

The device operates as follows.

At the wellhead (not shown in FIG.), The removable cover 2 (see FIG.) Is equipped with a sealing element 3 and an additional collar 10, after which it is installed

in the bottom part of the flap 1 and fix the removable cover 2 relative to the flap 1 with a shear element 4. The grouting mixture 8 is poured into the flap 1, after which a sleeve 9 is installed on the grouting mixture 8 inside the flap 1, and then the tip 5 is screwed onto the flap 1. Next, the device connected to the geophysical cable 12 and lower it into the well at the desired interval for emptying the cement mixture 8.

In the process of lowering the device into the well (not shown in Fig.), Rigid centralizers 11 center the device in the well, and the borehole fluid below the device is transferred from bottom to top into the borehole space above the device due to the self-sealing cuff 7 passing from the bottom up, after which the borehole fluid through the holes 6 of the tip 5 fall into the inner space 13 of the baffle 1, creating additional pressure on the grouting mixture 8, while the grouting mixture 8 does not interact with the well fluid thanks to the cuff 9, which excludes its interaction with the borehole fluid from above and the additional cuff 10 with the sealing element 3, which, in turn, exclude the interaction of the grouting mixture 8 with the borehole fluid from below, thus, the grouting mixture 8 is hermetically delivered to a predetermined interval of the well .

Next, the wellhead is tied to a pump unit (not shown in Fig.) And the well is filled with process fluid, then the geophysical cable 12 is sealed at the wellhead and a certain overpressure is created in the well above the self-sealing cuff 7, for example, 3.0-4.0 MPa which presses the self-sealing cuff 7 against the walls of the well, while the overpressure through the through holes 6 of the tip 5 is transmitted inside the baffle 1 and, by means of the cuff 9 and the grouting mixture 8, presses on top of the removable cover 2, while defining the divided element is destroyed by the shear element 4, and the removable cover 2 falls out of the bottom of the choke 1, while in the inner space 13 of the choke 1 the excess pressure of the borehole fluid created by the pump unit is transferred to the cuff 9, which displaces the grouting mixture 8 from the chute 1, since the lower end of the chute 1 is open, while the borehole fluid replaces the grouting mixture 8 in the choke 1.

At the same time, without relieving pressure in the well, the device is slowly raised up to the expected upper level of the grouting mixture 8 in the well, depending on its volume in the choke, while the cuff 9 moves axially down and falls into the well.

After reaching the expected upper level of the grouting mixture 8 in the well, the pressure in the well above the self-sealing cuff 7 is reset to zero. Then depressurize the geophysical cable 12 at the wellhead, and the device

completely removed to the surface, and the grouting mixture 8 remains in the range of emptying of the device in the form of a cement bridge.

The proposed device for the delivery of grouting mixture into the well allows you to empty the bulk material delivered to the well in any of its interval, in addition, the presence of an additional cuff allows you to increase the tightness of the material delivered to the specified interval of the well.

Claims (1)

A device for delivering cement mixture to a well containing a bailer, a removable cover located at the bottom of the bailer, a cuff installed inside the bailer, a tip with through holes screwed on top of the bailer, rigid centralizers, a sealing element, characterized in that on the outer surface of the tip a self-sealing cuff is installed, passing from bottom to top, while the removable lid from the bottom is provided with an additional cuff, and the removable lid with a shear element is connected to the chipper.