RU60967U1 - 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 deepening 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. A plug is hermetically sealed inside the choke at the upper level of the material delivered to the well, while the bottom of the choke is provided with a diametrically wider section opposite which longitudinal through grooves are formed in the choke, forming a bypass channel restricting the axial downward movement of the cork in the working 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 deepening 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 “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 internal space of the baffle above the cuff is filled with borehole fluid during the descent of the device into the well,

in addition, the borehole fluid creates additional pressure on the cuff during emptying of the choke.

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 emptied only partially or not completely emptied, and therefore forced extrusion of materials that lose their flow properties after contact with the liquid is necessary;

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 pivotally interconnected 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 spine is equipped with a self-sealing cuff, which passes from bottom to top and is rigidly fixed on it with stops, and inside the bobbin at the upper level of the material delivered to the well, a plug is hermetically installed, while the lower part of the bobbin is provided with a diametrically expanded

a section opposite which longitudinal through grooves are made in the choke, forming a bypass channel restricting the axial downward movement of the plug in the 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, pivotally interconnected 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.

A plug 22 is sealed inside the bobbin 1 at the upper level of the material 20 delivered to the well 21, while the lower part of the bobbin 1 is provided with a diametrically expanded section 23 opposite which longitudinal through slots 24 are formed in the bobbin, forming a bypass channel 25 restricting the axial downward movement of the plug 22 in the working position.

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

At the mouth (not shown in the figure) of the well 21, the cover 2 of the flap 1 is installed in the working position. For this, a sealing element 8 is installed on the cover 2 (see the figure).

The baffle 1 is filled with the necessary amount of material 20, which must be delivered to the well 21, 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 flap 1 with material 20 from the upper end side, a plug 22, for example, made of rubber, is hermetically installed inside the flap 1. Next, screw the tip 4 onto the flap 1, connecting the latter with a geophysical cable 26, on which the device is lowered into the well 21. During the descent of the device into the well 21, the liquid inside it flows from the bottom up through a self-sealing cuff 19, rigidly fixed

by means of the upper 17 and lower 18 stops on the chute 1, while rigid centralizers 6 center the device relative to the well 21.

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 outward, while the upper ends of the levers 10 and 11 are rigidly fixed to the sleeve 3, therefore, to a certain moment collet grab 9 ceases to fix the cover 2, which falls out of the flap 1 on the length of the flexible connection 7.

Next, the wellhead (not shown in FIG.) Wells 21 are connected with a pumping unit (not shown in FIG.) And the geophysical cable 26 is sealed at the wellhead. Next, a certain pressure is created in the well 20 above the self-sealing collar 19, for example, 4.0-5, 0 MPa, which presses the self-sealing cuff 19 against the walls of the borehole 20, the stronger, the higher the pressure, which, in turn, is transmitted through the through holes 5 of the tip 4 into the baffle 1.

Inside the flap 1, hydraulic pressure acts on the upper end of the plug 22, which, under the action of the perceived pressure created by the pump unit in the well 20 above the self-sealing collar 19, moves down the flap 1, displacing and replacing the material 20 delivered to the well 21, since the lid 2 is open, this, without relieving pressure in the well 21 of the device, slowly lift up to the estimated upper level of the material 20 in the well 21 (depending on the volume of material 20 in the chute 1). As soon as the plug 22 enters the enlarged section 23 of the flap 1, the well fluid located in the flap 1 above the plug 22 through the longitudinal through grooves 24 through the bypass channel 25 and again through the longitudinal through grooves 24 rushes under the plug 22 from where it displaces the remaining material 20 remaining in the lower the end of the chute 1 into the well 21, while the pressure created by the pumping unit in the well 21 above the self-sealing collar 19 drops sharply, which indicates the end of the emptying of the device. Then depressurize the geophysical

cable 26 at the wellhead 21 and the device is completely removed to the surface, and the material 20 in the form of a bridge remains in the specified interval of the well 21.

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 on 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, characterized in that the cover 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 pivotally connected to each other the radial movement outward and release from fixing the cover in the working position, the collet levers connected to the sleeve are made of spring steel, the sealing element is mounted above the cover 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 inside the chipper at the upper level of the material delivered to the well, a tube is sealed, while the bottom Part bailer is provided with diametrically expanded portion, opposite which a longitudinal through-bailer formed grooves forming the bypass channel, limiting the axial downward movement of tube in the operative position.