RU45446U1 - DEVICE FOR ELIMINATION OF TAKEOFF - Google Patents

Abstract

The proposal relates to the oil and gas industry, in particular to percussion devices designed to eliminate seizures of emergency equipment in vertical, deviated and horizontal wells. The device for eliminating sticking consists of a housing with a narrow and wide main and additional cameras mounted respectively below and above the narrow chamber. Inside the housing, a hollow rod with a piston concentrically located, which is located in its original position in the narrow housing chamber. The internal space of the housing is filled with a working fluid, and the piston is equipped with throttling channels. The proposed device for eliminating sticking is simple and cheap to manufacture and use, has a small number of parts, making it reliable in operation.

Description

The proposal relates to the oil and gas industry, in particular to shock devices designed to eliminate seizures of emergency equipment in wells.

The well-known "hydromechanical Yass" (patent RU No. 2145659, IPC E 21 B 31/113, 31/107, publ. Bull. No. 5 from 02.20.2000), containing a housing, the middle part of which is made in the form of a cylinder, hollow rods with seals, connected to each other by a piston dividing the cylinder into the supra-piston and sub-piston cavities, the lower pair of anvils, one of which is installed in the upper part of the body on its inner surface, a check valve and a throttling nozzle, an annular groove is made in the upper part of the cylinder, this cylinder is filled with working fluid moreover, it contains upper and lower transverse partitions separating the cylinder from the upper and lower parts of the housing, a rod installed in the upper part of the housing and rigidly connected to the hollow rod, a cylindrical insert mounted in the piston with the possibility of radial movement, the second non-return valve, the upper a pair of anvils, an annular groove is made in the lower part of the cylinder, while the check valves are built into the piston, and one of them is installed with the possibility of passing the working fluid from the over-piston cavity in the under-piston one, and the second is installed with the possibility of passing the working fluid from the sub-piston cavity into the supra-piston, the throttle nozzle is installed on one of the check valves, at the entrance to the annular grooves, longitudinal grooves are made on the surface of the cylinder, the upper pair is anvil mounted in the upper part of the coupling, the lower pair is installed at the bottom of the traction.

Also known is the "Double-acting hydraulic jar" (patent RU No. 2230880, IPC E 21 B 31/113, 31/107, publ. Bull. No. 17 dated 06/20/2004), including a hollow cylindrical body, in the middle part of which is formed a working cylinder telescopically mounted in the housing and a rod connected with it with a spline connection with a through axial channel and a piston in the middle part located in the working cylinder and having a throttling channel connecting annular and under-piston cavities of the working cylinder filled with hydraulic fluid, annular

dividing pistons movably mounted above and below the working cylinder between the body and the rod, and a tearing device that keeps the rod from moving relative to the body, while the working cylinder is formed on the piston stroke length by a cylinder sleeve located inside the body, sealed in the middle part relative to the body, and both sides of the seal forming annular cavities with the body, by means of end clearances, respectively, with the over-piston and under-piston cavities of the working cylinder, and having different torons from the seal through radial holes.

The disadvantages of the above structures are:

- difficulty in manufacturing and maintenance;

- a large number of parts difficult to manufacture;

- service requires the use of highly qualified specialists;

- and, as a result, high cost and low reliability.

The closest in technical essence and the achieved result is “Device for the elimination of sticking” (a.s. SU No. 1330301, IPC E 21 V 31/113, 31/03, publ. Bull. No. 30 dated 08/15/1987), comprising a housing with a narrow and wide chambers, a hollow rod with a check valve and a piston located in the initial state in a narrow housing chamber, a packer with a pressure sleeve connected to the rod by means of shear pins, telescope mounted in the piston radial channels, and the valve of the hollow piston size Underneath them, the push sleeve is installed with the possibility of limited axial movement relative to the housing, and the wide chamber is made below the narrow one, and an additional wide chamber can be made above the narrow chamber.

The disadvantages of this design are:

- throttling of the fluid when moving down occurs at the piston contact with a narrow chamber of the downhole fluid, which leads to rapid wear of these parts and a decrease in reliability;

- the presence of an uncontrolled connection of the pressure sleeve with the stem with shear pins leads to a break in the connection during water hammer, which leads to inefficient operation of the packer.

The technical task of this proposal is to create a simple to manufacture and maintain, cheap and reliable design of the device for eliminating sticking in the well.

The device for eliminating sticking includes a housing with a narrow and wide main and additional cameras installed respectively below and above the narrow

chamber, hollow rod with a piston located in the initial position in a narrow chamber housing.

New is that the internal space of the housing is filled with a working fluid, and the piston is equipped with throttling channels.

Figure 1 shows a device for eliminating sticking in the well in the initial position.

The device consists of a housing 1 with a narrow 2 and wide main 3 and an additional 4 cameras installed respectively below and above the narrow camera 2.

Inside the housing 1, a hollow rod 5 is mounted, rigidly connected to the piston 6, which is located in the initial position in the narrow chamber 2 of the housing 1. The internal space of the housing 1 is filled with a working fluid 7 (for example, mineral oil), and the piston 6 is equipped with throttling channels 8. Hollow the rod 5 has the possibility of limited reciprocating movement in the housing 1.

Unauthorized overflows of the working fluid 7 in the device are prevented by the sealing rings 9 and 10.

A device for eliminating sticking works as follows.

Before starting work to eliminate sticking in the well, the inside of the housing 1 from above and below is filled with working fluid 7 by means of filling holes hermetically sealed with plugs (not shown in Fig.), While the hollow stem 5 with the piston 6 are in the initial position in the narrow chamber of the housing 1 as shown in the figure.

After that, at the bottom of the well, a fishing tool is attached to the device from the bottom by means of a connecting thread 11 (not shown in Fig.), And from above the device is connected via a sleeve 12 to the work string 13 according to the scheme and work plan for eliminating sticking in the well.

The working string 13 complete with a device for eliminating sticking and a fishing tool lowers the well (in Fig. Not shown) in the interval where the stuck equipment is located.

Next, capture the tacked equipment (in Fig. Not shown) using a fishing tool.

After capturing the stuck equipment, they begin to raise the working column 13 upward, and the hollow rod 5 with the piston 6, which are in the initial position at the beginning of the narrow chamber 2, begin to slowly move upward, while the working fluid 7 flows from the over-piston cavity (i.e. from the narrow chamber) 2, located above the piston 6 and the wide main chamber 3) into the piston cavity (

there is a narrow chamber 2, located below the piston 6 and a wide additional chamber 4), thanks to the throttling channels 8, made in the piston 6 with a design diameter d and having high hydraulic resistance, while the piston 6 is in contact with the inner wall of the housing 1 throughout throughout the narrow chamber 2. This allows you to increase the tension of the working column 13 up to its permissible value. Having passed the narrow chamber 2, the hollow rod 5 with the piston b fall into the wide main chamber 3, while the working fluid 7 freely flows from the supra-piston cavity into the sub-piston cavity. The pressure of the liquid in the supra-piston cavity drops sharply, the force holding the working string 13 in the extended state becomes not significant, and the hollow stem 5 with the piston 6 moves under extreme tension of the working string 13 to its highest position, while the piston 6 strikes sharply with its upper end inside the upper end of the housing 1. This blow through the housing 1 and the fishing tool is transmitted to the downstream tacked equipment.

If the seized equipment has not been released, then the tool is immediately unloaded, as a result of which the hollow rod 5 with the piston b quickly moves down, with free flowing of the working fluid 7 from the under-piston cavity (i.e. narrow 2 and wide additional chamber 4, as well as wide the main chamber 3, located below the piston 6) into the supra-piston cavity (i.e., into the wide main chamber 3, located above the piston 6).

As soon as the hollow rod 5 with the piston 6 enters the narrow chamber 2, the speed of their movement decreases sharply, while the further flow of the working fluid 7 from the subpiston cavity into the supra-piston cavity over the entire length of the narrow chamber 2 occurs due to the throttling channels 8 in the piston b, which render the flow of the working fluid is a large hydraulic resistance.

In the subpiston cavity, pressure is proportional to the compressive force. The compression force is accumulated in the form of elastic energy of compression deformation of the working column 13.

When the hollow rod 5 with the piston 6 fall into the wide additional chamber 3, free flow of the working fluid 13 from the sub-piston cavity 4 to the supra-piston cavity 3 occurs and the hollow rod 5 with the piston 6 quickly moves downward. The fluid pressure in the sub-piston cavity drops sharply, and the elastic energy the compression of the working column 13 is transformed into a blow of the lower end of the piston 6 about the lower end of the housing 1. This impact is transmitted through the housing 1 and the fishing tool to the downstream tacked equipment.

If it is necessary to apply repeated strikes, if the seized equipment is still not released, the whole process described above is repeated.

The proposed device for eliminating sticking is simple and cheap to manufacture and use, has a small number of parts, making it reliable in operation.

Claims (1)

A device for eliminating sticking, comprising a housing with a narrow and wide main and additional cameras mounted respectively below and above the narrow chamber, a hollow rod with a piston located in the initial position in the narrow chamber of the housing, characterized in that the inner space of the housing is filled with working fluid, and the piston is equipped with throttling channels.