RU2336405C1 - Device to fix retractable drill tools in casing string - Google Patents

Abstract

FIELD: oil and gas production industry.

SUBSTANCE: invention is related to hardware used for wellbore drilling with simulations casing. Device includes shoe with inner annular and longitudinal grooves attached to the bottom of casing string, hollow bore spindle with bottom connecting thread and seal in top part located inside the shoe, annular cartridge with installed blades, thrust fans and rams for interaction with casing string shoe. The shoe is provided with rigidly connected tapered seat. Spindle is provided with tapered shoulder in midsection. The annular cartridge contains of two parts with capability of limited axial motion relative to each other, with spring-controlled rams located in bottom part with capability to interact with annular groove of the shoe and with thrust fans gimbaled in the top part provided with tapered inner and outer surfaces with tapered seat of the shoe and tapered shoulder of the spindle. The bottom part of the spindle is provided with annular groove and spring-controlled rams are provided with rigidly connected pins that can be fixed in spindle groove. Spring is installed between parts of the cartridge.

EFFECT: ensures better interface of thrust fans when couples with the shoe and also prevents seizure of central spindle with moving element when handles inside casing string till locked in the shoe.

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Description

The invention relates to technical means used in the process of drilling a wellbore with its simultaneous casing casing, which grows as the hole deepens and is not removed from the well to change the bit.

A device for fixing a downhole motor in a shoe of a casing string, consisting of a ram device mounted in the lower part of the downhole motor and a sealing cuff in the upper part of the downhole motor [1]. During the descent and ascent of the extracted (plug-in) tool inside the casing string, the dies slide in the recessed (transport) position along the pipe walls together with the extracted tool. At the moment of reaching the shoe, the columns of the die are put forward with the help of springs into the ring groove of the shoe and are delayed at the inner end of this groove. Continuing to fall, the downhole motor sits in a cone-shaped lower part in the dies and wedges them. When removing the insert tool, the dies are folded from the stop into the upper conical ledge of the inner ring undercut of the shoe.

The disadvantage of this device is the possibility of jamming the dies with the conical lower part of the downhole motor when passing the joints of the column during descent, as well as the limited ability to transfer reactive moment to the pipe string by the friction conical connection of the die device.

The closest in technical essence and the achieved result is a device for securing the extracted drilling tool in the casing string, containing a shoe attached to the bottom of the casing string with internal annular grooves and longitudinal grooves, a central hollow spindle with a lower connecting thread and a seal in the upper part placed inside the shoe, an annular holder with blades mounted on it, persistent blades and dies for interaction with the shoe [2, 3, 4].

The disadvantage of this device is the lack of contact of the elements that perceive axial loads of drilling.

The objective of the invention is to increase the reliability of the device for fixing the drilling tool in the casing in operation.

The technical result obtained by the implementation of the invention is to improve the contact of the thrust blades when they are articulated with the shoe, as well as preventing jamming of the central spindle with movable elements mounted on it during transportation inside the casing until it is fixed in the shoe.

The specified technical result is ensured by the fact that in the device for securing the retrievable drilling tool in the casing string containing a shoe attached to the bottom of the casing string with internal annular grooves and longitudinal grooves, a central hollow spindle with a lower connecting thread and a seal in the upper part, annular located inside the shoe a clip with mounted blades on it, thrust blades and dies for interaction with the casing shoe, the shoe is provided with a rigidly connected m with a conical seat, the spindle is made with a conical ledge in the middle part, the annular cage consists of two parts with the possibility of limited axial movement relative to each other, in the lower part of which are spring-loaded dies with the possibility of interaction with the annular groove in the shoe, and in the upper hinged fixed thrust blades with tapered inner and outer surfaces with the possibility of contacting with the tapered seat of the shoe and the tapered ledge of the spindle, and in the lower part of the spindle is made the face groove, and the spring-loaded dies are equipped with pins rigidly connected with them with the possibility of fixing them in the spindle groove, while a spring is mounted between the parts of the cage.

The essence of the invention lies in the fact that thanks to the installation inside the shoe of a rigidly connected conical seat, in the upper part of the movable cage - thrust blades pivotally mounted on it with conical inner and outer surfaces, and in the middle part of the spindle - a conical ledge, it is possible to create a monolithic fixing the central spindle by contacting on the tapered surfaces of the seat, blades and spindle.

The presence of an annular groove in the lower part of the spindle, and in the spring-loaded dies - pins rigidly connected with them, allows the spindle to be fixed in the recessed position of the dies from axial movement and prevents the thrust vanes from wedging during transport of the spindle inside the casing, ensures that the blades are fixed in the conical seat when hit dice into the inner annular groove at the bottom of the shoe.

The invention is illustrated by drawings.

Figure 1 shows the layout of the extracted (plug-in) drilling tool at the time of its movement inside the casing string.

Figure 2 shows the same layout at the time of its landing in the saddle of the shoe and the start of work on the development and drilling of the wellbore while lowering the casing.

Figure 3 shows a longitudinal section of a device for securing a recoverable drilling tool in a casing in the position for drilling a recoverable (plug-in) layout.

Figure 4 shows a longitudinal section of the inner (retrievable) part of the device with the elements mounted on it in the transport position.

Figure 5 is a cross section aa of figure 3 along the blades.

In Fig.6 is a cross section bB of Fig.4, explaining the design of the hinge node for connecting the thrust blades with the holder.

7 is a view In figure 4, explaining the design of the pairing of the upper and lower parts of the cage, allowing you to have limited movement of them relative to each other.

A device for securing a recoverable drilling tool in a casing string consists of a shoe 1 connected to the lower part of the casing 2 and an internal retrievable part 3 with shoe connection elements located on the spindle 4. Spindle 4 is the upper part of the layout of the recoverable (plug-in) drilling tool including drill collar 5, downhole motor 6, expandable expander 7 and pilot bit 8. Other elements can be included in the layout, for example, coring shell, diverter, etc. The extracted drilling tool is transported to the bottom and removed to the surface inside the casing string 2 (Fig. 1).

The bottom of the casing string is equipped with a shoe, the housing of which contains a conical seat 9, as well as an annular groove 10 and longitudinal grooves 11.

Shoe 1 of the casing string (Figs. 3, 5) includes an outer casing with a conical seat 9 rigidly mounted therein, an inner annular groove 10 in the lower part and longitudinal grooves 11 in the upper part. The upper thread 12 shoe is attached to the casing; the lower part 13 of the shoe is thickened (somewhat smaller in diameter than the diameter of the well). The outer surface of the thickened part of the shoe, as well as its end surface, are reinforced with carbide teeth 14. On the outer surface of the thickened part, longitudinal grooves are made for the passage of washing liquid. Inside the shoe there is a central spindle 4 with a flushing channel 15 and a hollow spring-loaded rod 16 with seals located inside it 17. An annular groove 18 with a bevel 19 is made on the outer surface of the rod. A seal in the form of a piston 20 is mounted in the upper part of the spindle. The lower part of the spindle is represented by a thread 21. In the middle part of the spindle, radial grooves 22 are made in which the blades 23 are arranged to move in the radial direction. Blades are fixed with pins. Below the grooves 22 in the middle part of the spindle there is a conical step 24 and an annular groove 25. In the lower part of the spindle, the upper 26 and lower 27 ring cages are mounted. The clips are interconnected using a gripper 28, allowing limited relative axial movement of the clips.

A spring 29 is located on the outer groove of the lower cage 27, which acts through the washer 30 on the upper cage 26. In the upper casing on the pivot axes 31, thrust blades 32 with inner 33 and outer 34 conical surfaces are mounted. The shank 35 of the blade rests on a flat spring 36, secured by screws 37 on the cage. The axis 31 is fixed in the hole with a pin 38.

In the lower casing, spring-loaded retractable dies 39 are placed having pins 40 rigidly connected to them. An annular groove 41 is made in the lower part of the spindle.

A device for securing a recoverable drilling tool in the casing is as follows.

In a deflated casing, the bottom of which is equipped with a shoe 1 with a conical seat 9 rigidly connected to it, internal longitudinal grooves 11 and an annular groove 10 in the lower part, a retrievable (plug-in) tool consisting (generally) of a pilot bit, sliding, is transported expander, downhole motor, drill collar and the upper part of the layout - the inner part 3 of the device for securing the extracted drilling tool in the casing.

The transportation of the extracted tool can be carried out on a rope, or by dropping into the casing with pumping the drilling fluid. All the sliding elements mounted on the spindle - dies 39, thrust blades 32, blades 23 are in the recessed position and are protected when moving the inner surface of the casing.

The spring-loaded rod 16 is in the extended position and the blades 23 located in the grooves 22 of the spindle are supported on the outer surface of the annular groove 18 of the rod 16.

Thrust blades 32 in the recessed position are located in the annular groove 25 of the spindle 4.

Due to the fact that in the transport position, the dies 39 with pins 40 interact with the groove 41 of the spindle 4, the latter does not have the ability to move relative to the lower 27 and the upper 26 of the cage mounted on the thrust blades 32, thereby ensuring that the thrust blades 32 are not wedged from exposure to them conical ledge 24 of the spindle 4 when lowering the extracted tool inside the casing.

When landing the extracted drilling tool in the shoe 1, the spring-loaded dies 39 are the first to fall into the annular groove 10 of the casing shoe 39, as a result of which the lower 27 and upper 26 of the cage with thrust blades 32 stop. When radially moving the dies into the annular groove of the shoe, the pin 40, rigidly connected with the dies, moves and it leaves the groove 41 of the spindle 4, as a result of which the spindle is released and moved relative to the fixed external system, the thrust blades exit the annular recess 25, the conical step 24 the spindle slides on the inner conical surface 33 of the thrust blades 32 and comes into contact with them. The rotation of the blades 32 takes place in the cavity above the conical seat 9. Due to the presence of a spring 29 on the lower cage 28, which acts on the upper cage 26 with the mounted thrust blades 32 and the preliminary clearance in the gripper 28, the final closure of the conical surfaces of the saddle, thrust blades and spindle occurs after compression of the spring 29 and the choice of the gap in the gripper 28. This design solution allows you to compensate for the inaccuracy of the relative location along the length of the seating elements in the shoe body, inevitable when anufacture products.

After the spindle has been mounted, mud pumps are turned on. Sealing the flushing channel 15 when pumping the drilling fluid is carried out by the piston 20 of the spindle 4.

Under the action of the pressure of the drilling fluid on the spring-loaded rod 16, it moves up and the blades 23 extend by means of the chamfer 19. If the blades are prevented from being extended by the inner surface of the shoe body with areas where there are no longitudinal grooves, then when the downhole motor starts, under the influence of a reactive moment the spindle will turn and the blades will sink into the grooves, thereby realizing the perception of the reactive moment of the engine by the casing string.

The use of the proposed technical solution when drilling a well while lowering the casing allows you to avoid accidents that occur during the drilling of wellbores in unstable rocks, and to improve reliability.

Information sources

1. G.S. Barshay, Ya.A. Gelfgat, A.Z. Romanov. "Turbine drilling without lifting pipes." Publishing house "Nedra", M., 1967, (Fig. 26, 32, 33)

2. SPE / IADC Drilling Conference, February 19-21, 2003, "Directional drilling with casing" Tommy Warren, Bruce Houtchens, Garret Madell (Figure 1).

3. US patent No. 7021382 from 04.04.2006, Angman P. O., Hughes J. "Downhole axial force generating tool" (Figure 2).

4. Prospectus "Tesco corp." (Canada) "Casing Profile Nipple". Bulleten 74000e.

Claims (1)

A device for securing a retrievable drilling tool in a casing string, comprising a shoe attached to the bottom of the casing string with internal annular grooves and longitudinal grooves, a central hollow spindle with a lower connecting thread and a seal in the upper part, an annular holder with mounted blades mounted on it blades and dies for interaction with the casing shoe, characterized in that the shoe is equipped with a tapered seat rigidly connected to it, the spindle is flax with a conical ledge in the middle part, the annular cage consists of two parts with the possibility of limited axial movement relative to each other, in the lower part of which spring-loaded dies are located with the possibility of interaction with the annular groove in the shoe, and in the upper part persistent blades with conical inner and external surfaces with the possibility of contacting with the conical seat of the shoe and the conical ledge of the spindle, and in the lower part of the spindle an annular groove is made, and spring-loaded pla ki fitted rigidly associated with locking pins in their groove of the spindle, wherein the spring is mounted between the parts of the cage.

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