RU62966U1 - DEVICE FOR DELIVERY OF MATERIALS TO A WELL - Google Patents

Abstract

The proposal relates to the oil and gas industry and can be used in the repair of wells in order to disconnect or temporarily shut off the formations by installing cement or sand bridges in the well, as well as when increasing the bottom of the wells. A device for delivering materials to the well comprises a bailer with a lid, a sleeve that is screwed onto the lower end of the bailer, a tip with through holes from above bent onto the bailer, and rigid centralizers. The baffle is equipped with a self-sealing cuff rigidly fixed on it by means of the upper and lower stops, which passes from the bottom up. The lid with a flexible connection is fixed to the flap, and the sealing element is installed above the lid and is made in the form of a dish-shaped cuff. The cover in the choke is fixed from below using a collet grip connected to the sleeve. The collet grip is made in the form of levers connected by a hinge to the honey with the possibility of radial displacement of the collet grip outward and release from fixing the cover in the working position. The grip levers connected to the sleeve are made of spring steel. The choke is equipped with radial holes, opposite which the movable sleeve is hermetically mounted in the initial position, fixed in the choke by a spring ring. Inside the flap at the upper level of the material delivered to the well, a plug is hermetically installed, interacting with the movable sleeve in the working position. An inner annular protrusion is made at the lower end of the baffle, limiting the axial movement of the movable sleeve down in the operating position. The proposed device for delivering materials to the well has sufficient reliability by fixing the lid in the choke using a collet that excludes contact with the internal walls of the well and made in the form of levers pivotally connected to each other, as well as forced extrusion of materials in a given interval of the well. In addition, the device eliminates the possibility of emergency operations in the well, since balls are excluded from the device design, which avoids the additional cost of removing or drilling them. 1 ill. for 1 liter

Description

The proposal relates to the oil and gas industry and can be used in the repair of wells in order to disconnect or temporarily shut off the formations by installing cement or sand bridges in the well, as well as when increasing the bottom of the wells.

It is known "Device for delivering the components of the mixture into the well" (copyright certificate No. 1165767, IPC 7 E 21 B 33/132, published in Bulletin No. 25 of 07/07/1985), containing a housing, a container for the main component placed in it , a container for the setting accelerator and a shutter, 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 under cotter pin t and a 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 device 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 E 21 V 27/02, published in Bulletin No. 1 dated January 10, 2005 .) containing a choke with a removable cap located in the bottom of the choke, the cap 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 divine lid, while the lid is fixed to the sleeve by a flexible connection, while the outer surface of the flap is equipped with rigid centralizers, and a cuff is installed inside the flap after filling it with bulk material, the lid is equipped with a sealing element, and a tip is screwed on top of the flap, in which through holes through which the inside of the bobbin above

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

The disadvantages of this device are:

firstly, low reliability, since during the descent of the device into the well, it may be prematurely triggered due to contact of the movable sleeve with the internal walls of the well, especially in deviated wells. In addition, during the transportation of materials to the well, the material being transported (for example, sand) comes into contact with the well fluid, as a result of which the sand gets wet and loses fluid properties when emptied. As a result, the transported material is only partially emptied or not emptied at all, which necessitates the forced extrusion of materials that lose their flow properties after contact with the liquid.

secondly, after the operation of the device in the process of its subsequent rise, the probability of falling balls into the well is high, which necessitates their extraction or drilling, and this leads to emergency operations and therefore to additional costs.

The technical task of the utility model is to increase the reliability of the device by eliminating its premature contact with the internal walls of the well and forced extrusion of materials in a given interval of the well, as well as eliminating emergency operations in the well.

The technical problem is solved by the proposed device for delivering materials to the well, comprising a bailer with a cover fixed by a flexible connection and located in the bottom of the bailer, a sleeve that is located on the lower end of the bailer, a sealing element, a tip with through holes on top screwed onto the bailer, rigid centralizers.

What is new is that the lid in the choke is fixed from below using a collet grip connected to a sleeve that is screwed onto the choke, while the collet chuck is made in the form of levers connected by honey pivotally with the possibility of radial movement outward and release from fixing the lid in the working position, moreover, the collet levers connected to the sleeve are made of spring steel, while the sealing element is mounted above the cover and is made in the form of a disk cuff, while the bobbin is on the outer surface The piston is equipped with a self-sealing cuff, which passes from the bottom up and is rigidly fixed on it with stops, and the chipper is equipped with radial holes, opposite which are hermetically sealed

a movable sleeve is installed in its initial position, fixed in the chipper by a spring ring, while inside the choke, at the upper level of the material delivered to the well, a plug is installed that interacts with the chuck in the working position, and an inner annular protrusion is made at the lower end of the chipper, restricting the axial movement of the chuck down in working position.

The figure shows the proposed device in longitudinal section.

A device for delivering materials to the well comprises a bailer 1 with a cover 2, a sleeve 3 that is screwed onto the lower end of the bailer 1, a tip 4 with through holes 5 screwed onto the bailer from above, rigid centralizers 6. The cover 2 is fixed to the bailer 1 by a flexible connection 7, and the sealing element 8 is installed above the cover 2 and is made in the form of a dish-shaped cuff. The cover 2 in the choke 1 is fixed from below using a collet grab 9 connected to the sleeve 3.

The collet gripper 9 is made in the form of levers 10, 11, 12 and 13, connected by a hinge to each other by means of hinges 14, 15 and 16 with the possibility of radial displacement of the collet gripper 9 outward and release from fixing the cover 2 in the working position.

The levers 10 and 11 of the collet gripper 9 connected to the sleeve 3 are made of spring steel.

The baffle 1 is provided with a self-sealing cuff 19 rigidly fixed on it by means of the upper 17 and lower 18 stops, passing from bottom to top.

The flap 1 is provided with radial holes 20, opposite which the movable sleeve 21 is hermetically mounted in the initial position, fixed in the flap 1 by a spring ring 22. Inside the flap 1 at the upper level of the material 23 delivered to the well 24, the plug 25 is interacting with the movable sleeve 21 in the working position. At the lower end of the flap 1, an inner annular protrusion 26 is made, limiting the axial movement of the movable sleeve 21 down in the operating position.

A device for delivering materials to a well works as follows.

At the mouth (not shown in the figure) of the well 24, the cover 2 of the flap 1 is installed in the working position. For this purpose, a sealing element 8 is installed on the cover 2 (see the figure), after which, by means of a collet gripper 9, the cover 2 is fixed in the chipper 1, after which, against the radial holes 20 of the chute 1, the movable sleeve 21 is hermetically mounted and fixed with a spring ring 22.

The baffle 1 is filled with the necessary amount of material 23, which must be delivered to the well 24, for example, with quartz sand, the volume of which is determined based on the filling height of a given interval of the well. After filling the baffle 1

material 23 from the upper end to the inside of the baffle 1 hermetically install a plug 25, for example, made of rubber. Next, screw the tip 4 onto the flap 1, connecting the latter with the geophysical cable 27, lower the device into the well 24. In the process of lowering the device into the well 24, the liquid inside it flows from the bottom up through the self-sealing cuff 19, which is rigidly fixed by means of the upper 17 and lower 18 stops on the bailer 1, while the hard centralizers 6 center the device relative to the well 24.

When the device reaches the drainage interval, which can serve as a bottom hole or a previously installed stop (packer, cement bridge) (not shown in Fig.) Unload the device on it. As a result of unloading the device to the bottom of the well or a previously installed emphasis, the lower ends of the levers 12 and 13 are connected with it, interconnected by a hinge 15, which rotate and move outward relative to the hinge 15, which in turn rises. As a result, the lower ends of the levers 10 and 11, connected to the levers 12 and 13 by means of hinges 14 and 16, respectively, also move outward.

The device continues to be unloaded to the bottom of the borehole or stop, while the levers 10 and 11 of the collet gripper 9, made of spring steel, are bent due to the radial movement of their lower ends to the outside, while the upper ends of the levers 10 and 11 are rigidly fixed to the sleeve 3, so at a certain moment collet 9 ceases to fix the cover 2, which falls out of the baffle 1 by the length of the flexible connection 7. Next, the mouth (Fig. not shown) of the well 24 is tied to a pump unit (not shown in Fig.) and the geophysical cable is sealed at the mouth 27, after which a certain hydraulic pressure is created in the well 24 above the self-sealing cuff 19, for example, 4.0-5.0 MPa, which presses the self-sealing cuff 19 against the walls of the well 24 the stronger, the higher the pressure, which in turn is through the hole 5 of the tip 4 is transmitted inside the baffle 1.

Inside the flap 1, hydraulic pressure acts on the upper end of the plug 25, which in turn moves down the flap 1, displacing and replacing the material 23 delivered to the well 24, since the lid 2 is open, while not releasing the pressure in the well 24, the device is slowly lifted up to the expected upper level of material 23 in the well 24 (depending on the volume of material 23 in the chute 1). At a certain moment, the plug 25 with its lower end interacts with the upper end of the movable sleeve 21. The pressure in the well 24 above the self-sealing sleeve 19 is continued to be pumped by the pump unit, while the spring ring 22 fixing the movable sleeve 21 is hermetically sealed in the chute 1

opposite the radial holes 20, it compresses and releases the movable sleeve 21 from fixing with the flap 1. As a result, the movable sleeve 21 together with the plug 25 are lowered down along the flap 1 until the lower end of the movable sleeve 21 abuts against the inner annular protrusion 26 of the flap 1, while the radial holes 20 blocked by a movable sleeve 21 open and the borehole fluid from the internal space of the baffle rushes into the borehole 20 under a self-sealing sleeve 19, while a sharp pressure drop is observed on the pressure gauge of the pump unit, which idetelstvuet an emptying device end. After that, the geophysical cable 27 is depressurized at the wellhead 24 and the device is completely removed to the surface, and the material 23 in the form of a sand bridge remains in the specified interval of the well 24.

The proposed device for delivering materials to the well has sufficient reliability by fixing the lid in the choke using a collet that excludes contact with the internal walls of the well and made in the form of levers pivotally connected to each other, as well as forced extrusion of materials in a given interval of the well. In addition, the device eliminates the possibility of emergency operations in the well, since balls are excluded from the device design, which avoids the additional cost of removing or drilling them.

Claims (1)

A device for delivering materials to a well, comprising a bailer with a cover fixed by a flexible connection and located at the bottom of the bailer, a sleeve that is located at the lower end of the bailer, a sealing element, a tip with through holes, screwed onto the bailer from above, rigid centralizers, characterized in that that the lid in the choke is fixed from below using a collet grip connected to a sleeve that is screwed onto the choke, while the collet chuck is made in the form of levers connected by a hinge to the honey radial movement outward and release from fixing the lid in the working position, and the collet levers connected to the sleeve are made of spring steel, while the sealing element is mounted above the lid and is made in the form of a cup cuff, while the chipper on the outer surface is equipped with a self-sealing cuff passing from bottom to top and rigidly fixed on it by stops, and the chipper is provided with radial holes, opposite which a movable sleeve is sealed in its original position a cylinder fixed in the choke by a spring ring, while inside the choke at the upper level of the material delivered to the well, a plug is installed that interacts with the movable sleeve in the working position, and an inner annular protrusion is made at the lower end of the choke, restricting the axial movement of the movable sleeve downward in the working position.