RU2421598C1 - Device for extracting wedge-deflector from well - Google Patents

Abstract

FIELD: oil and gas production. ^ SUBSTANCE: device consists of sub, of hollow case with screwed pointed lower end wherein there is installed coupling performing limited lengthwise travels upward and interacting with sub, and of fishing unit inside case. The fishing unit corresponds to a hollow rod rigidly connected to the coupling and equipped with a radial channel and inclined surface for a wedge chute. Also, the hollow rod has a lower spring loaded bush with tapered surface on top; the bush is inserted into the radial channel of the rod and travels and interacts with a process orifice of the wedge; an upper spring loaded bush travels downward in the cavity of the rod. The upper bush is equipped with a seat communicated with an internal cavity of the case for a ball and with a taper below. The seat interacts with tapered surface of the lower bush pressing it off inclined surface when the upper bush travels downward. ^ EFFECT: elimination of wedge-deflector break-away at its extraction, elimination of emergency operations for disassembly of device when wedge-deflector can not be extracted from well. ^ 3 dwg

Description

The invention relates to the oil and gas industry and can be used in the construction of multilateral wells and drilling sidetracks from cased wells.

A well-known fishing hook (see page 13, “Use of a removable whipstock for drilling a well with two horizontal shafts”, Oil and Gas Technologies, 1994, No. 1-2), including a beard located in the lower part, which enters from the front side of the whipstock wedge into the through slot in his body.

The disadvantages of this fishing hook are:

- the need to orient the fishing hook relative to the slot in the body of the wipstock;

- the possibility of non-extraction of whipstock from the well, because the fishing hook has only one fulcrum and the whipstock can skew during extraction, which will lead to its jamming;

- the difficulty of disconnecting the fishing hook from the whipstock if it is not removed from the well.

The closest technical solution is a bell with an insertable fishing sleeve (see Pustovoitenko IP “Prevention and elimination of accidents in drilling”, 3rd ed., Revised and additional - M .: Nedra, 1998. - 279 p. : ill., § 4 Bells, fig.5.6.g, p. 179), including a sub, a hollow body with a screw pointed lower end and a fishing mechanism located inside the body.

The disadvantages of this bell are:

- the possibility of breaking the wedge-diverter from it;

- the difficulty of disconnecting the bell from the diverter wedge if it cannot be removed from the well.

The technical task of the invention is the creation of a reliable design of a device for extracting a deflecting wedge from a well, which eliminates cases of failure of the deflecting wedge from it, and also eliminates the need for emergency work to unhook the device if it is impossible to remove the deflecting wedge from the well.

The technical problem is solved by a device for extracting the deflecting wedge from the well, including a sub, a hollow body with a screw pointed lower end and a fishing mechanism located inside the body.

What is new is that inside the case with the possibility of limited longitudinal upward movement, a coupling equipped with an upper selection is installed, and a protrusion made at the bottom of the sub is designed to interact with the coupling selection, while the fishing mechanism is made in the form of a hollow rod connected rigidly to the coupling and equipped a radial channel and an inclined surface under the trough of a wedge equipped with a technological hole, and on the reverse side of the inclined surface, the rod is abutted into the body, and from the inside is equipped with bushings , the lower of which is inserted into the radial channel of the rod with the possibility of movement and interaction with the technological hole of the wedge, is spring-loaded towards the inclined surface and provided with a transverse hole with a beveled surface at the top, and the upper one is in the cavity of the rod with the possibility of moving down, and is equipped with a saddle communicated with the internal cavity of the housing under the ball and the bevel below, made with the possibility of interaction with the beveled surface of the lower sleeve with squeezing it from the inclined surface when moving down the upper her bushings.

Figure 1 shows a device for extracting a whipstock from the well (longitudinal section). In Fig.2 - view A in Fig.1. Figure 3 - a device for extracting a wedge-diverter from the well in mesh with the wedge (longitudinal section).

A device for extracting a deflecting wedge from a well (FIGS. 1, 3) includes an adapter 1 for connecting to a drill pipe string (not shown), a hollow body 2 with a screw pointed lower end 3 (FIGS. 1, 2). Inside the housing 2 (FIGS. 1, 3), for example, with emphasis on the annular sample 4, a coupling 5 is mounted with the possibility of limited longitudinal movement up. In this case, the coupling 5 is equipped with an upper sample 6, made with the possibility of interaction with the protrusion 7, made from the bottom of the sub 1. Inside the housing 2 there is a fishing mechanism made in the form of a hollow rod 8, rigidly connected to the coupling 5, for example, by means of a thread, etc. d. and equipped with a radial channel 9 and an inclined surface 10 under the trough of the wedge 11 (figure 3), equipped with a technological hole 12. Moreover, on the reverse side of the inclined surface 10 (figure 1, 3), the rod 8 is abutted in the housing 2, and from the inside is equipped with bushings 13 , 14. The lower sleeve 13 is inserted into the radial channel 9 of the rod 8 with the possibility of movement and interaction with the technological hole 12 (Fig.3) of the wedge 11. In addition, the lower sleeve 13 (Fig.1, 3) is spring loaded with a leaf spring 15 in side of the inclined surface 10 and provided with a transverse hole 16 with beveled constant surface 17 at the top. The upper sleeve 14 is installed, for example, by means of a shear pin 18 in the stem cavity 8 with the possibility of moving downward and is equipped with a saddle 19 connected with the internal cavity of the housing 2 through the hole 20 for the ball 21. In addition, the upper sleeve 14 is equipped with a bevel 22 at the bottom, made with the possibility of interaction with the beveled surface 17 of the lower sleeve 13 with squeezing it from the inclined surface 10 when moving down the upper sleeve 14.

The device operates as follows.

A drill pipe string (not shown) is attached to the sub 1 (Figs. 1, 3) and the device is lowered into the well so that the screw pointed lower end 3 (Figs. 1, 2) of the hollow body 2 (Figs. 1, 3) is 1.5-2 m above the "head" of the wedge 11 (figure 3). Then turn on the mud pump (not shown) and, rotating the device at the minimum rotor speed, continue the descent of the device. In this case, the screw pointed lower end 3 (Fig. 1, 2) of the hollow body 2 (Fig. 1, 3) enters the gap between the production string (not shown) and the back of the wedge 11 (Fig. 3), wound the wedge “head” 11 into the housing 2 of the device. The descent of the device is continued with rotation, while the screw pointed lower end 3 (Figs. 1, 2) destroys the cuttings from stagnant zones between the wedge 11 (Fig. 3) and the production string, and leaches it by circulating the flushing fluid through the hole 20 (figures 1, 3). When the hollow rod 8 rests against the "head" of the wedge 11 (Fig. 3), the coupling 5 (Figs. 1, 3) is shifted upward to fix its selection 6 in the protrusion 7 made in the sub 1. The hollow rod 8 is rotated and enters an inclined surface 10 in the gap between the chute of the wedge 11 (figure 3) and the housing 2 (figure 1, 3) of the device. The clutch 5 disengages from the sub 1 and slides all the way down to the ring selection 4 in the housing 2, thereby allowing the lower sleeve 13 mounted in the radial channel 9 of the hollow rod 8 to move along the gutter of the wedge 11 (Fig. 3) without rotation . When approaching the lower sleeve 13 (Fig.1, 3) to the technological hole 12 (Fig.3) on the trough of the wedge 11, the leaf spring 15 (Fig.1, 3) pushes it into the technological hole 12 (Fig.3). In this case, an increase in the weight of the tool on the weight indicator (not shown) will serve as a signal that the engagement has occurred. Stop the descent and rotation of the device and the circulation of the flushing fluid. By tensioning the drill pipe string, the diverter wedge is broken and raised to the surface.

If it is impossible to remove the deflecting wedge, a ball 21 (shown conditionally) is thrown into the drill pipe string, which sits in the seat 19 (Figs. 1, 3) of the upper sleeve 14 mounted in the internal cavity of the hollow rod 8, for example, using a shear pin 18. The mud pump is turned on, while under the pressure of the flushing fluid, the pin 18 and the upper sleeve 14 are cut off, moving downward with their bevel 22 located below, interacts with the beveled surface 17 of the transverse hole 16 of the lower sleeve 13 and squeezes it from obliquely surface 10, and outputs from the process opening 12 (Figure 3) the wedge 11, producing device unhooked from the wedge 11. Then the device is retrieved to the surface.

An advantage of the proposed device for extracting a diverting wedge from a well is that its design eliminates cases of disruption of the diverting wedge from it, and also eliminates the need for emergency work to unhook the device if it is impossible to remove the diverting wedge from the well.

Claims (1)

A device for extracting a deflecting wedge from a well, including a sub, a hollow body with a screw pointed lower end and a fishing mechanism located inside the body, characterized in that a sleeve equipped with an upper selection is installed inside the body with the possibility of limited longitudinal upward movement, and the bottom of the sub is made the protrusion made with the possibility of interaction with the selection of the coupling, while the fishing mechanism is made in the form of a hollow rod connected rigidly to the coupling and equipped with a radial with an anal and inclined surface under the trough of a wedge equipped with a technological hole, and on the reverse side of the inclined surface the rod is abutted in the housing and inside equipped with bushings, the lower of which is inserted into the radial channel of the rod with the possibility of movement and interaction with the technological hole of the wedge, spring-loaded towards the inclined surface and is equipped with a transverse hole with a beveled surface at the top, and the upper one - into the cavity of the rod with the ability to move down, and is equipped with a saddle communicated with the inner polo Tew housing under the bowl and the bottom chamfer adapted to cooperate with the tapered surface of the lower sleeve by squeezing it against the inclined surface when moving down the upper hub.

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