Accedentally sub

 

(57) Abstract:

The invention relates to emergency tool, namely the breakaway device designed to disconnect the free part of the column pipe stuck in a well. The invention consists in that the device includes a housing, upper and lower adapters, the first of which is connected by means of the right and the second through left-hand threads with a knot of her stall and performed with the saddle under the bargain valve. In the cavity of the body is placed a movable rod fixed in the initial position against axial movement and is made with a stepped outer and inner surfaces, the diameter is wider internal cavity greater than the outer diameter of the upper level of the stock. The housing and the lower adapter completed with a combined end-to-end radial channels placed in them by the node locking, each of which is made in the form of a spring-loaded hollow finger with a ring clamp and retainer forming a working chamber for accommodating the spring and communicated with the inner cavity of the lower adapter channel is blocked in the initial position of the lower stage of the stem, the outer surface of caterogies work and to expand the scope of the device. 5 C.p. f-crystals, 2 Il.

The invention relates to emergency tool, namely the breakaway device designed to disconnect the free part of the column pipe stuck in a well.

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 438774, CL 21 In 17/06, 1973).

A disadvantage of the known device is the complexity of construction and abandonment of the well a significant number of parts after separation columns.

Closest to the proposed to the technical essence and the achieved result is accedentally sub comprising a housing, upper and lower adapters, the first of which is connected to the housing by means of the right and the second through left-hand threads with a knot of her stall and performed with the saddle under the bargain valve, and placed in the body cavity of the movable rod fixed in the initial position against axial movement and is made with step naru is m the upper part of the stem (see patent of Russia 2002026, CL E 21 In 17/06, 1991).

This device has a simple structure compared with analogue, and after its operation 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 lack of reliability due to the inability to use, the locking fingers of the required size, which is of special importance when drilling small diameter, a specific manufacturing complexity associated with the need for precise alignment of the axial holes for the locking fingers three mating parts: piston, the housing and the bottom of the adapter and the presence of a special retainer for piston rod, and also limited the scope of its application. The latter is connected with the impossibility of its use, as well as other known separating devices, in conjunction with downhole motors: rotary drills, hammers, etc.

In connection with the above technical object of the invention is to increase reliability, simplify manufacturing techniques disconnecting device and extending the scope of its application.

Referenced tehniki, the first of which is connected to the housing by means of the right and the second through left-hand threads with a knot of her stall and performed with the saddle under the bargain valve, and placed in the body cavity of the movable rod fixed in the initial position against axial movement and is made with a stepped outer and inner surfaces, the diameter is wider internal cavity greater than the outer diameter of the upper level of the stock, according to the invention the housing and the lower adapter completed with a combined end-to-end radial channels placed in them by the node locking, each of which is made in the form of a spring-loaded hollow finger with a ring clamp and clamp, forming a working chamber for accommodating the spring and communicated with the inner cavity of the lower adapter channel is blocked in the initial position of the lower stage of the stem, the outer surface of which is made with an annular groove for engagement with the ends of the fingers.

The task also contributes to that:

- accedentally sub is equipped with a sleeve disposed in the upper cavity of the adapter, the sleeve and the adapter are made with inclined toward the center channels for rannego channel adapter;

- stop the larger diameter outer surface of the rod is made in the form of a removable element, preferably in the form of a disk with diameter larger minimum diameter of the inner surface of the shell.

radial channels in the lower adapter and placed his fingers made congruent with stepped surfaces;

- case and lower adapters are made with an extra left-handed, while the node locking is the height between the two left-hand threads;

- thread the fishing tool is made in the upper part on the inner surface of the lower adapter.

In Fig. 1 shows a General view of the breakaway device of Fig.2 - node locking in an enlarged scale.

Accedentally sub includes a housing 1, which is connected with the upper and lower adapters 2 and 3, the rod 4 and node locking. Top sub 2 can be performed with channel 5, informing the cavity of the housing 1 with the annular space. If there is a substantial amount of cuttings in the borehole to avoid salamouny threaded connections for overlapping channel 5 is used by the check valve. However, the most viable option is to perform channel 5, costumecostume outer and inner surfaces, respectively 6 and 7. At this stage 6 of larger diameter outer surface of the rod 4 is located between the upper and lower treads made in the form of pistons. Step 7 of larger diameter of the inner surface of the rod 4, which is located in its lower part, has a diameter of d2larger outer diameter d1the top step. The upper coupler 2 is connected to the housing 1 by means of right-hand threads and provided with a sleeve 19, is placed in the cavity of the housing 1 and is made oblique to the axis of the device channel 20. The sleeve 19 is attached to the upper adapter 2 by means of a calibrated pin 21, the effort for the slice which is less than the force for axial movement of the rod 4. Inclined channel 20 is designed to accommodate a ball valve 24, which is installed through an inclined channel 22 in the upper adapter 2, which is locked after you install a ball valve 24, as a rule, a removable plug 23. For locking ball valve 24 in the initial position inclined radial channel 20 of the sleeve 19 is shifted upward relative to the channel 22 of the adapter 2.

The bottom adapter 3 is made with a saddle 25 under the ball valve 24, the tapered threads 26, under the fishing tool and connected to the housing 1 through the primary and secondary left threads 8 which I include hollow finger 9 of stepped form with the annular collar 10 and the screw retainer 11 with the spring 12, placed between them. The number of hollow fingers 9 is selected depending on the magnitude of the transmitted torque, taking into account the strength used for their manufacturing material. Hollow fingers 9 are mounted in aligned end-to-end radial channels 15 and 16 respectively of the housing 1 and the bottom of the adapter 3, and the shape of the channel 15 congruent outer surface of the stepped part of the hollow fingers 9. The annular collar 10 in conjunction with the latch 11 to form a working chamber 13 connected to the cavity bottom adapter 3 through the channel 14. The channel 14 in the initial position overlapped with the lower level of the rod 4, is placed in the cavity of the housing 1 and is fixed against axial movement of spring-loaded hollow retaining fingers 9, the spherical head which is fixed in an annular groove 17, is made on the outer surface of the rod 4. The latter features a removable element, such as a disk 18 that is connected with the rod 4 thread. Plate 18, forming a stage large diameter shaft 4, has an outer diameter greater than the minimum internal diameter of the housing 1. This ensures lifting rod 4 together with the housing 1 after disconnecting the device.

Mounting the unit carry out the following serial is usually used for the ends of the hollow fingers 9 are not acted on its outer surface. Then connect the housing 1 with the lower adapter 3 through the left threads 8 and 27 and combine their radial channels 15 and 16. Then install the rod 4 and lock it relative to the bottom adapter 3 spring-loaded hollow retaining fingers 9. When moving rod 4 down the bottom end presses the protruding ends of the fingers 9, which, moving in the radial channels 15 and 16 are in engagement with the housing 1 and thereby protect the left of the thread 8 and 27 from unscrewing during operation. When moving the hollow fingers 9 through the channels 15 and 16 simultaneous platoon springs 16, the force of the compression of which is adjustable by a threaded retainer 11. When the Assembly is installed, the upper adapter 2.

Assembled breakaway device included in the composition of the drilling tool in a desired location, such as a turbo-drill, core-shell or other part of a composition having the largest diameter. In the process of drilling torque is transmitted through the upper adapter 2, the body 1, the hollow fingers 9 and the bottom adapter 3. In the case of the sticking tool to increase the fluid pressure to the preset value when the cut grooved dowel pin 21. Then sleeve the second valve 24, made from easily destructible material, slipping through the axial channel of the rod 4 and sits on the saddle 25, blocking the entrance channel bottom adapter 3. Under the pressure of the drilling fluid to the rod 4 by the difference in diameters of d1and d2the outer surface of the upper stage 6 and the inner surface of the greater level 7 rises, displacing through the channels 5 in newportnews cavity washing fluid and overcoming the resistance of the hollow locking finger 9. After lifting rod 4 above hollow fingers 9, the latter under the action of the springs 12 and the fluid pressure in the working chamber 13, where it flows through inclined channels 14 of the cavity accedentes, thrown out of engagement with the housing 1 and the sink in the radial channels 15 of the bottom adapter 3. This point on the surface is fixed by a sharp pressure drop due to the implementation of the fingers 9 are hollow. After this rotation of the drill string to the right produce disconnection device on the left threads 8 and 27. After separation column, which is determined by reducing the weight on the hook, all the elements of the device, except for the bottom adapter 3 with hollow fingers 9 and a ball valve 24, together with the drillstring rise to the surface. Sharedcost collapses and releases the lock channel. If necessary, this process can be accelerated by supplying a portion of the solution with special additives.

The proposed design of the switch allows you to use regardless of the diameter of the hole of the hollow fingers 9 of the required diameter, which guarantees the possibility of transferring considerable torque without strain. In this case, thanks to the joint use of pressure washing liquid and the efforts of the springs 12 increases the reliability of operation of the node locking. This contributes to the use of two left threads 8 and 27, providing no consoles connection of the housing 1 and the bottom adapter 3, which help to keep the alignment of radial channels 15 and 16 and thereby to avoid deformations of the hollow fingers 9. The presence of the fishing thread 26 at the bottom adapter 3 allows quick connection of the drill string deployed in conjunction with other auxiliary devices (Jassy, vibrators and so on) for the elimination of the accident stuck with part of the drilling tool.

All this increases the reliability and efficiency of the proposed usedintense of the sub and thereby reduces the cost of drilling operations.

1. Accedental the right STV, and the second through left-hand threads with a knot of her stall and performed with the saddle under the bargain valve, and placed in the body cavity of the movable rod fixed in the initial position against axial movement and is made with a stepped outer and inner surfaces, the diameter is wider internal cavity greater than the outer diameter of the upper level of the stem, wherein the housing and the lower adapter completed with a combined end-to-end radial channels placed in them by the node locking, each of which is made in the form of a spring-loaded hollow finger with a ring clamp and clamp, forming a working chamber for accommodating the spring and communicated with the inner cavity of the lower adapter channel is blocked in the initial position of the lower stage of the stem, the outer surface of which is made with an annular groove for engagement with the ends of the fingers.

2. Accedentally sub under item 1, characterized in that it is provided with a sleeve disposed in the upper cavity of the adapter, the sleeve and the adapter are made with inclined toward the center channels to accommodate the bargain valve, and an inclined channel of the sleeve in an initial position offset in the of the action scene, the step of larger diameter outer surface of the rod is made in the form of a removable element, preferably in the form of a disk with diameter larger minimum diameter of the inner surface of the shell.

4. Accedentally sub under item 1, characterized in that the radial channels in the lower adapter and placed his fingers made congruent with stepped surfaces.

5. Accedentally sub under item 1, characterized in that the housing and the lower adapter completed with additional left-hand thread, while the node locking is the height between the two left-hand threads.

6. Accedentally sub under item 1, characterized in that the lower adapter is made on the inner surface with a thread fishing tool, this thread is located above the node locking.

 

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