RU90480U1 - DEVICE FOR CRACKING, ATTACHING, UNFINDING AND UNLOADING THE COLUMN HEAD OF THE OPERATING COLUMN - Google Patents

Abstract

The device for fastening, attaching, screwing and unscrewing the column head of the production string, mounted on the flange of the column head, comprises a cylindrical body with a slot, a telescopic arm, upper and lower flanges with a slot, bolts connecting the lower flange to the slot, and the column head flange with the possibility of transmitting torque, while the upper flange with a slot and the lower flange with a slot are made for a different type of flange of the column head.

Description

The utility model relates to overhaul and maintenance of wells, namely, devices for unfastening, attaching, screwing and unscrewing the column head of the production string.

Currently, most of the stock of production and injection wells has different height of the wellhead above ground level. In connection with bringing the wellhead to a single piping standard, during underground and major repairs, work is underway to install additional sub or couplings on the production casing. In addition, there are various technological operations, and well surveys, the conduct of which is impossible without a lapel and removal of the production head from the production string.

Recently, there has been an increase in work related to the unfastening, fastening, unscrewing and screwing of the column head.

Currently, for fastening, unfastening, screwing and unscrewing the threaded connection of the column head of the production casing, two KCN-3 chain wrenches (TU 26-02-355-76) manufactured by Ishimbay Machine-Building Plant OJSC are simultaneously used. One key КЦН-3 is used for screwing and unscrewing the column head, and the second key КЦН-3 is used to prevent rotation of the coupling or nozzle, that is, the second key works to lock the bottom of the production casing.

The disadvantages of the chain key KTsN-3 are:

- insufficient value of the maximum torque for unfastening and attaching the threaded connection of the column head;

- inconvenience in work;

- significant weight, as a result of which the key must be suspended during operation from the tackle system of the lifting unit;

- due to the limited working space at the wellhead during an underground or overhaul, it is necessary to constantly reinstall the key;

- with a low location of the wellhead above ground level, work is performed in an inconvenient inclined position;

- with a significant ovality of the outer diameter of the production string, the chain key is rotated.

- Frequent failure due to open circuit or breakage of the key handle.

A machine key is known, including a large and a small jaw, pivotally fastened with a lever-handle, which is equipped with swivels for attaching the traction and safety ropes, gripping toothed dies on these jaws installed in the die holders, a latch pivotally fastened with a large jaw and adapted to interact with a small jaw, and the large jaw is made in the form of a single or multi-layer (multi-row) package of flexible elastic elements, on which a number of die holders are placed, while the package of flexible other elements made in the form of high-strength tapes or ropes equipped with eyes for connecting the jaws with each other by means of fingers, as well as with a latch and a lever-handle (RF patent No. 2295624 class. IPC (ЕВВ 19/16).

The disadvantage of this technical solution is:

- design complexity;

- due to the limited working space at the wellhead during an underground or overhaul, it is necessary to constantly reinstall the key;

- with a low location of the wellhead above ground level, work is performed in an inconvenient inclined position;

- with a significant ovality of the outer diameter of the production string, the chain key is rotated.

A device for screwing large-diameter casing pipes containing a one-piece body with a central hole for the pipe, pivotally connected to the body, a wedging element made in the form of two figured crackers with a lever, tensioned springs, and a cable, while the device is equipped with a one-piece two-section coil installed on the housing with the possibility of rotation relative to the latter for winding two cables on it in opposite directions and with a latch for locking the coil relative to the housing (AS No. 1654 523 C. IPC Е21В 19/16).

The disadvantages of this technical solution are:

- it is necessary to use a drawworks as an actuator;

- the central hole of the one-piece housing is less than the diameter of the column head.

The technical task of the proposed utility model is to create a simplified design of a device for fastening, attaching, screwing and unscrewing the column head of the production string, which improves the quality of work when screwing the threaded connection of the column head and improves working conditions.

The technical problem is solved due to the fact that the device for unfastening, attaching, screwing and unscrewing the column head of the production string contains a cylindrical body with a slot, a telescopic swing lever, an upper flange with a slot, a lower flange with a slot. To unify the device, the upper and lower flanges have different diameters corresponding to the most common sizes of column head flanges (AFK) and (GNS).

The device is mounted on the flange of the production casing and bolted to it with the possibility of transmitting torque directly with bolts that work for shearing and crushing.

The device consists of a cylindrical body with a slot 1, an upper split flange 2 and a lower split flange 6. The lower flange with a slot 4 and the upper flange with a slot 2 have different diameters and correspond to the connecting dimensions of the flanges of the AFK and GNS column heads. Through flanges 4 and 2 are made through holes for bolts or studs. On the outer surface of the cylindrical body for installing the tubular rotation lever 12, sleeves 3 are welded at an angle, which are reinforced with scarves 4, 5. To increase the torque, the rotary lever 12 is made telescopic. Unfastening and attaching the column head is carried out with the lever extended as much as possible.

The essence of the utility model is illustrated by drawings.

Figure 1 shows a General view of the device.

Figure 2 shows a General view of the cross section of the device.

Figure 3 shows the installation diagram of the device for unscrewing and screwing the column head without lifting tubing.

The device operates as follows.

If the string of tubing 10 and the downhole equipment is removed from the well, then a device for fastening and fastening is installed on the flange of the column head 7 of the production string 9, which is attached to the lower split flange 6 by at least four studs or bolts, then into one of the bushings 3, depending on the equipment’s arrangement conditions, a telescopic arm 12 is installed in the working area of the wellhead. For the delay from rotation, a chain key 11 is installed on the coupling 8 of the production casing. Depending on the direction of application of forces to the telescopic arm, the column is unfastened or fixed, screwed up or unscrewed.

If the threaded connection of the casing head to the production casing without lifting at the mouth of the downhole pumping equipment and the tubing string is secured, the sleeve end of the tubing 10 is hooked up with an elevator (not shown in the figure) suspended on a hook by means of slings (not shown in the figure), and it is lifted by a lifting unit to a height of 700-900 mm from the column flange 7 of the production string. The proposed device with a lower flange with a slot is attached to the flange of the column head with bolts or studs, while the tubing string through the slots in the cylindrical body 1, upper 2 and lower 6 flanges of the device is installed in the center of the device. To ensure the safety of work, the tubing string coupling is located above the upper flange 2, while the tubing string is additionally fixed with an ECL elevator of the corresponding size (not shown in the figure).

Then, in one of the bushings 3, depending on the conditions of the equipment’s location in the working area of the wellhead, a telescopic arm 12 is installed. A chain wrench 11 is installed on the coupling 8 of the production string 9 to delay it from turning. Depending on the direction of application of forces, the telescopic arm is unfastened or fastening screwing or unscrewing the column head.

The proposed device ensures the quality and reliability of threaded connections of the column head and production string, significantly increases the productivity of the work performed, allows you to increase or decrease the height of the production string without lifting the tubing. The device is easy to manufacture and operate.

Claims (1)

The device for fastening, attaching, screwing and unscrewing the column head of the production string, mounted on the flange of the column head, comprises a cylindrical body with a slot, a telescopic arm, upper and lower flanges with a slot, bolts connecting the lower flange to the slot, and the column head flange with the possibility of transmitting torque, while the upper flange with a slot and the lower flange with a slot are made for a different type of flange of the column head.