Breakaway device

 

(57) Abstract:

The invention relates to emergency tool, namely the breakaway device designed to disconnect the free part of the column pipe stuck in the hole of the projectile. The invention consists in that the device includes a housing connected therewith by means of left-hand threads with safety device adapter. Site for fracture zones sticking comprising radial channels for messages cavity device with the annular space and is placed in the cavity of the housing with the possibility of overlapping radial channels of node destruction movable in the axial direction of the sleeve with the groove on the outer surface, the saddle under the bargain valve and lock movement. The body is made of radial channels. The site of the fracture zone of sticking made in the form of jetting nozzles installed in the radial channels of the body, and milling crowns, rigidly connected with the housing and located above the nozzles with the opportunity to interact with their output ends. Bargain valve made of destructible or deformable material. The sleeve is provided with a stopper in the form of a spring with a support element, p is between the support element and the sleeve. The invention improves the reliability and efficiency of the device. 3 C.p. f-crystals, 3 ill.

The invention relates to emergency tool, namely the breakaway device designed to disconnect the free part of the column pipe stuck in the hole of the projectile, for example, downhole motor, core shell, etc.

Known breakaway device comprising a housing, upper and lower adapters, the latter of which is connected to the housing by means of left-hand threads and locking the fingers, and a movable rod with a piston mounted in the housing with the opportunity to interact with locking fingers (see ed. St. USSR N 438774, CL E 21 In 17/06, 1973)

A disadvantage of the known device is the complexity of the design and as a consequence low reliability in operation and abandonment of the well a significant number of parts after separation columns.

Known also accedental, comprising a housing with radial channels, adapters, attached to the housing by means of the connection node a safety device placed in the cavity of the housing with the possibility of overlap of its radial channels movable in the axial napra, 1977). The disadvantages of this device should be considered of low reliability associated with the complexity of its design and the possibility of deformation of the elements of the torque transmission due to their limited size, which can in some cases completely eliminate the separation device.

Another drawback is the need for a left rotation of the column to the liberation of the free part of the column from the tack that does not always lead to the separation column at the specified location. In addition, the known device after the descent of the valve into the well requires lifting to the surface, which significantly increases the overhead of time and dramatically reduces the efficiency of the liberation of the column.

Closest to the proposed to the technical essence and the achieved result is disconnecting device, comprising a housing with radial channels, the adapter coupled to the housing by means of left-hand threads with a safety device placed in the cavity of the housing with the possibility of overlap of its radial channels movable in the axial direction of the sleeve with the groove on the outer surface, the saddle is a device due to the presence of site erosion zone of sticking and implementation of the safety devices in the form of a Cam, that allows you to transmit high torque, in some cases, has a higher reliability and efficiency. This is facilitated also by the fact that, compared with the equivalent after its actuation in the well remains only the lower adapter with valve, which greatly simplifies further fishing operations.

To the negative sides of the prototype can be attributed to insufficient effectiveness of site erosion zone of sticking, which is associated with the possibility of blockage of the radial channels of the body cuttings in the drilling process. Another disadvantage is the possibility of jamming of the eccentric, especially when transferring to the drill shaft, a significant torque that usually accompanies the process of emergency response. Another disadvantage of the prototype is the necessity of lifting the drill string after flushing valve, even in those cases when it is possible to dilute the slurry tube. This significantly increases the overhead of time for extra carrying tripping.

In connection with the above technical object of the invention is to improve the reliability and efficiency of disconnecting ustroyst> The specified technical task is solved in that in the breakaway device, comprising a housing connected therewith by means of left-hand threads with safety device adapters, host for the destruction zone of sticking, radial channels for messages cavity device with the annular space and is placed in the cavity of the housing with the possibility of overlapping radial channels of node destruction movable in the axial direction of the sleeve with the groove on the outer surface, the saddle under the bargain valve and retainer move, according to the invention the radial channels for messages cavity device with annular space is made in the case, the site of the fracture zone of sticking made in the form of jetting nozzles, established in radial channels of the body, and milling crowns, rigidly connected with the housing and located above the nozzles with the opportunity to interact with their output ends, bargain valve made of destructible or deformable material, and the sleeve is provided with a stopper in the form of a spring support member, the support element is fixed against axial movement relative to the adapter, and a spring installed between the supporting element and the sleeve.

Resh is the IDA spline connection, formed by dowels or splines on the outer surface of the sleeve and aligned with the longitudinal grooves on the inner surface of the housing and adaptor;

the sleeve is made of stepped form with a screw thread on the outer surface of the tread of a smaller diameter below the spring, which is connected with the sleeve Rethimno;

- output of the channels jetting nozzles removed from the body axis by a distance smaller larger radius milling crowns.

The host is running fracture zones sticking in the form of jetting nozzles and milling crowns allows you to more effectively destroy the slurry tube through the joint mechanical and hydraulic impact weapons milling crowns and speed of flow of the liquid stream. Performing the same bargain valve destructible material, and the stopper sleeve in the form of a compression spring with a support element increases the efficiency of the device by eliminating lifting pipes in cases, when the success of the operation on the destruction zone of sticking. In this case, the proposed device allows you to continue the normal process of drilling. The implementation of the safety devices in the form of a splined connection polychaete fracture zone and sticking of the stopper sleeve, as well as the constructive implementation of the latter provides a simplification of the manufacture of the device and eliminates the abandonment of any of its elements in the well, except for the bottom of the adapter.

The invention is illustrated in the drawing, in which Fig.1 shows a General view of the breakaway device in longitudinal section; Fig.2 and 3 - section a-a in Fig.1 (embodiments of the guards).

Disconnecting the device includes a housing 1 with a radial channels 2A and 2B, the adapter 3 is connected to the housing 1 by means of left-hand threads 4 with a safety device, the sleeve 5 with the saddle under the bargain valve 6, the stopper and the stopper move 7 and the site of the fracture zones sticking. The sleeve 5 is installed in the cavity of the body 1 and the adapter with the possibility of axial movement and radial overlap of the channels 2A and 2B and is made with an annular groove 8 under the latch move 7. The lower part of the sleeve 5 has a stepped shape, on the level of larger diameter which made slots 9 (Fig.2) or fixed pins 10 (Fig.3), and on the level of smaller diameter threaded 11. In the upper part of the sleeve 5 is placed a sealing ring 12 and is made annular groove 13 for FIC is t to be made of destructible material, for example in the form of a glass ball, which destroyed more bargain element, for example, T-shaped metal rod of small diameter, the shank of which keeps the rod from falling to the bottom of a well (not shown). Another option complete valve 6 may be using material that is easily dissolved in a weak acid solution. As such material may be used a mixture of calcite filler and binder, for example dibutylphthalate or other plasticizer. It is also possible embodiment of the valve of deformable material with a small specific gravity, such as rubber.

The stopper sleeve 5 to keep it in the original position is made in the form of a spring 14 with a support element, for example in the form of a disk 15, is fixed against axial movement relative to the adapter 3 by any known means, such as screws (not shown) or the installation disk 15 between the ends of the adapter 3 and the ledge of the drilling Assembly 16. The spring 14 thus established between the disk 15 and the sleeve 5 and fixed it Rethimno, for example, by means of screw thread 11.

The site of the fracture zone of sticking of formed milling cutter head 17 with the teeth 18 are rigidly Sacre, and jetting nozzles 19 installed in the flushing channels 2A and secured from falling out by the end of the milling crowns 17 that is installed with the possibility of interaction with the output ends of the nozzles 19. The outer diameter milling crowns 17 must be larger than the diameter of the circle on which the output ends of the nozzles 19, while the axial channels of the nozzles 19 are oriented in the direction of the teeth 18 of the milling crowns, which protects the channels of the nozzles 19 of the plugging slurry.

Safety device left-hand threads 4 may be made in the form of the spline (Fig.2) formed by the slots 9 or dowels 10 (Fig. 3) and the combined grooves 19 and 20 on the inner surface, respectively, of the housing 1 and the adapter.

The latch movement 7 of the sleeve 5 serves to keep from falling into the well when lifting the drill string 21 after operation of the disconnector. The retainer may be made in the form of a spring-loaded rod with a certain force actuation, controlled by the preload of the spring rod and the depth of the grooves 8 is selected so that when the contact rod retainer 7 with the upper edge of the groove 8 radial channels 2A site of the fracture zone prihva 16 and connected with them by means of threads 22 and 23 on the right thread.

The principle of operation of the disconnector is as follows. In the process of drilling tools torque from the column 21 is passed through the housing 1, the safety device and the adapter 3, the projectile 16. When the sleeve 5 is held in the initial position by the spring 14 placed between its lower end and a support element 15. The force of the actuation sleeve 5 is regulated by any known method, for example, installing between the spring 14 and the supporting member 15 washers calibrated thickness. In the event of sticking of the projectile 16 throw valve 6, which closes the flow cross-section of the sleeve 5. Under the pressure of the drilling fluid sleeve 5, overcoming the resistance of spring 14, goes down and opens the radial channels 2A and 2B. When this sleeve 5 from further movement down is retained by the retainer 7, which comes into contact with the upper end of the annular groove 8 of the sleeve 5. In this position, the slots 9 are not disengage from the housing 1. The flush fluid through the channels 2A and 2B is directed into the annulus for the destruction zone of sticking, aided by the facilities of the channels 2A jetting nozzles 19.

If possible twisting of the drill string 21 zone of sticking destroyed the t on the sleeve 5, the washing liquid can be fed through a certain number of channels, for example, only through the channels 2A. This dramatically increases the flow rate of drilling fluid and thereby increases the efficiency of destruction of the slurry tube, and hence the probability of release of the tool from sticking. In the case of erosion of the slurry tube (zone seconds) and release stuck projectile performed surgery to remove the valve 6. When using the valve of the soluble material in the cavity of the column inject the acid solution, which dissolves the plasticizer and thereby destroys the valve 6 and frees the Central channel of the sleeve 5.

When using the valve of fragile material destruction it is carried out by other bargain element, for example T-shaped rod of small diameter. When using the valve of elastic material with a small specific gravity to remove it can be used for backwashing. After removal of valve sleeve 6 5 under the action of the spring 14 occupies its original position, blocking the radial channels 2A and 2B, which allows you to continue the drilling process.

In case of impossibility of liberation tool increase the pressure Premia slots 9 or dowels 10 from engagement with the housing 1. After that, by rotating the drill string 21 to the right sever the casing 1 with the adapter 3 to the left of the thread 4. When the sleeve 5 is held from falling to the bottom of the retainer 7, which includes his rod in an annular groove 13. Thus, when lifting free of the column simultaneously raise all of the elements of the disconnector with the exception of the adapter and the support element 15. When lifting the flushing fluid in the cavity, is poured into the well through the open radial channels 2A and 2B.

Application of the proposed disconnector by improving the reliability and efficiency of his work will significantly reduce material and financial costs of the activities associated with the elimination of the sticking of the drill columns.

1. Breakaway device, comprising a housing connected therewith by means of left-hand threads with safety device adapters, host for the destruction zone of sticking comprising radial channels for messages cavity device with the annular space and is placed in the cavity of the housing with the possibility of overlapping radial channels of node destruction movable in the axial direction of the sleeve with the groove externally on the La message cavity device with annular space is made in the case, the site of the fracture zone of sticking made in the form of jetting nozzles installed in the radial channels of the body, and milling crowns, rigidly connected with the housing and located above the nozzles with the opportunity to interact with their output ends, bargain valve made of destructible or deformable material, and the sleeve is provided with a stopper in the form of a spring support member, the support element is fixed against axial movement relative to the adapter, and a spring installed between the supporting element and the sleeve.

2. Disconnecting the device under item 1, characterized in that the safety device is made in the form of a spline connection formed by dowels or splines on the outer surface of the sleeve and aligned with the longitudinal grooves on the inner surface of the housing and adapter.

3. Disconnecting the device under item 1, characterized in that the sleeve is made of stepped form with a screw thread on the outer surface of the tread of a smaller diameter below the spring, and the sleeve is connected with a spring Rethimno.

4. Disconnecting the device under item 1, characterized in that the output part of the channels jetting nozzles removed on the Sabbath.

 

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SUBSTANCE: device has tail casing pipe head and gripper system of primary casing pipe, packing members, circlips and sub. Upper part of outer head surface is cylindrical and has left-handed thread. Lower part thereof facing well bottom is conical. Intersection point of conical surface generators lays on well axis. Gripper system of primary casing pipe is formed as a shoe having inner surface defined by two conical surfaces with apexes extending in opposite directions. Adjoining surfaces of tail casing pipe head and casing shoe have 8-10° cone angles.

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