RU2420647C1 - Removable wedge deflector - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: device consists of guiding wedge with high pressure hose installed in it, of support unit in lower part of guiding wedge and of hydraulic chamber. The support unit consists of inclined surfaces convergent to axis of the deflector downward in form of a prism. A hollow bush with windows movable and spring-loaded from top envelops inclined surfaces. Dies are mounted on axles in the windows. A hydraulic cylinder made with a piston chamber axially actuates the bush from beneath, thus facilitating interaction of dies with inclined surfaces. A piston cavity of the cylinder is communicated with the central channel. Diametres of axial orifices of the dies exceed diametres of axles at value as high, as maximum possible radial travel of the dies. Also, the dies are of different diametres; at installation they facilitate an upper part of the wedge, with its side opposite to working surface, interacting with the wall of the well.

EFFECT: reliability of deflector arrangement when dies are wedged and simultaneously upper end of deflector is pressed to wall of well.

8 dwg

Description

The invention relates to drilling wells, namely, drilling sidetracks from previously drilled wells.

A device for drilling an additional barrel from a well is known, including a hollow body deflecting a wedge and a unit for lowering the device into the well in the form of a casing worn on a wedge and connected with it by a detachable connection, adapted to be connected to a pipe string (patent RU No. 20046561, E21B 7/08 , published by Bulletin No. 2 of January 30, 1994).

Its disadvantages are the design complexity due to the presence of packer and anchor nodes in it, as well as the unreliability, since fixing it in the well by abruptly feeding the tool down is an uncontrollable process, and the use of a liner for this is associated with high pipe costs.

Closest to the proposed by most coinciding features is a wedge diverter (RF patent No. 2166058, IPC E21B 7/08, publ. 04/27/2001, bull. No. 9), including a guide wedge with a working surface, a support assembly provided with a cylinder with a piston, interacting with retractable spacer elements made in the form of dies with teeth. The support assembly is rigidly connected to a guide wedge, which has a groove on the side opposite to the working surface for receiving a high pressure hose therein. The support unit is equipped with inclined surfaces, tapering from top to bottom to the axis of the deflector and interacting with the dies. The upper part of the wedge is fixed with a shear bolt with a suspension device.

Significant disadvantages are the impossibility of removing the wedge diverter from the well or its destruction after cutting the “window” in the pipe casing, as well as the need to clean the inner surface of the casing before cutting the “window”. The output of the dies in the radial direction depends on the inner diameter of the casing and is related to the stroke of the piston, therefore, it is necessary to know the exact inner diameter of the pipe, and this is an additional descent raising of the measuring tool.

Technical tasks - expanding the application due to the possibility of reusing the wedge diverter with removing it from the well, as well as installing the wedge diverter without preliminary preparation of the inner diameter of the casing while increasing the level of installation reliability and fixation in the well, obtaining a reduction in time when installing the wedge diverter and convenience during operation.

The technical problem is solved by a wedge removable deflector, including a guide wedge with a working surface, a groove located on the opposite side of the working surface, to accommodate a high pressure hose and a chamber in communication with the high pressure hose and located in the lower part of the wedge, and a support assembly with inclined surfaces, tapering from top to bottom, under the sliding dies, with a body rigidly connected to the guide wedge, the internal axial cavity of which is in communication with the chamber of the wedge, and the cylinder with the piston, nadporshneva I whose cavity is in communication with the cavity of the body.

New is that the inclined surfaces are made in the form of a multifaceted prism made on the outer surface of the housing, the lower surface of which is made cylindrical with a fixed piston, the outside of which is a cylinder made with the possibility of limited movement upward on the cylindrical surface of the housing, while outside the prism with the possibility of of limited longitudinal displacement upward and interaction from below with the cylinder, a hollow spring-loaded downward spring is placed, equipped uniformly along the perimeter meter and height with radial windows with axles for the dies, made with axial holes with a diameter exceeding the diameter of the corresponding axis by an amount not less than the maximum possible radial movement of the dies, and the dies are made of different diameters that simultaneously interact with the walls of the well during installation so that the upper part the wedge with the side opposite the working surface interacted with the borehole wall.

Figure 1 shows a wedge removable deflector in the transport position with a partial longitudinal section; figure 2 is a section aa of figure 1, figure 3 is a section bb of figure 1, figure 4 is a section bb of figure 1, figure 5 is a wedge diverter in the well with a partial a longitudinal section in the working position, in Fig.6 is a section G-D of Fig.5, in Fig.7 is a section DD DD of Fig.5, in Fig.8 is a section EE of Fig.5.

The wedge removable deflector comprises a guide wedge 1 (Fig. 1) with a working surface 2, a chamber 3 connected by a hose 4 to the cavity of the drill pipes (not shown). The hose 4 extends into a groove 5 located on the side opposite to the working surface 2 of the guide wedge 1. The housing 6 has inclined surfaces 7, tapering from top to bottom, forming a polyhedral prism on the surface of the housing 6, which is rigidly connected to the lower part of the guide wedge 1. Projection 8 located on the cylindrical surface 9 of the housing 6, is a piston and an upward restraint for the cylinder 10, forming a piston cavity 11 communicating with the bore 12 with the chamber 3. The lower part of the cylinder 10 has a narrowing 13. Above the cylinder 10 s the sleeve 14 with windows 15 is located with the possibility of movement, in which dies made in the form of rollers are fixed on the axles 16 (Fig. 4), in which the dies 17 have a maximum outer diameter located in the lower row from the side opposite to the working surface 2 of the wedge 1. The die 18 (figure 2) with a minimum outer diameter is located in the upper row from the side opposite to the working surface 2 of the wedge 1. The remaining dies 19 (figure 2, 3 and 4) have such outer diameters at which all the dies touch the walls of the well simultaneously forcing the top h There is a wedge with the side opposite to the working surface interacting with the wall of the well. The diameters of the holes 20 (FIG. 4) of the dies 17, 18 (FIG. 2), 19 (FIGS. 2, 3 and 4) are larger than the diameter of the axis 16 (FIG. 4) by an amount exceeding the radial stroke of the rams 17, (FIG. 4 ) 18 (FIG. 2), 19 (FIGS. 2, 3 and 4). In the lower part of the housing 6 (figure 1) there is a throttling hole 21 and a protrusion 22, restricting the movement of the sleeve 14 and the cylinder 10 down. The sleeve 14 is spring-loaded from top to bottom by a spring 23 resting against the protrusion 24 of the housing 6, while the spring 23 covers the inclined surfaces 7. The upper part of the guide wedge 1 is fixed by a shear element 25 with a suspension device 26, which is rigidly connected to the drill pipe string (not shown).

The wedge removable diverter works as follows.

A wedge removable deflector connected to drill pipes (not shown) by means of a suspension device 26 through a shear element 25 is lowered into the area where sidetracking from a previously drilled well 27 needs to be drilled. During descent, the layout is in the transport position, that is, sleeve 14 with dies 17 (figure 4), 18 (figure 2), 19 (figure 2, 3 and 4) under the action of a pre-compressed spring 23 (figure 1) rests on the upper part of the cylinder 10 and covers the lower part of the inclined surfaces 7 The difference between the diameters of the axis 16 (figure 4) and inside diameter 20 dies 17, 18 (figure 4), 19 (figure 2, 3 and 4) provides free passage of the dies 17 (figure 4), 18 (figure 2), 19 (figure 2, 3 and 4 ) along the wellbore 27 (Fig. 1). The dies 17 (FIG. 4), 18 (FIG. 2,), 19 (FIGS. 2, 3 and 4) do not interact with the inclined surfaces 7 (FIG. 1), since they are always in a pressed position by the spring 23. Narrowing 13 the cylinder 10 abuts against the protrusion 22 of the housing 6. The well fluid through the throttling hole 21, the chamber 3, the high pressure hose 4 fills the interior of the drill pipe (not shown). After lowering the layout to the desired interval, it is necessary to supply fluid through the drill pipe string (not shown), high pressure hose 4, chamber 3 into the throttling hole 21. Under the action of the differential pressure created due to the throttling hole 21 between the piston cavity 11 and the downhole space, the piston cavity 11 fills the holes 12, the cylinder 10 moves upward together with the sleeve 14, in the windows 15 of which there are dies 17, 18 (FIG. 2), 19 (FIGS. 2, 3 and 4) that come into contact with the inclined surfaces 7 (figure 1) and the inner surface of the wall of the casing of the well 27 (figure 5). The dies 17 (FIG. 8), 18 (FIG. 6), 19 (FIGS. 6,7 and 8) move in the radial direction due to the difference in the diameters of the axis 16 (FIG. 8) and the hole diameter 20 of the dies 17, 18 (FIG. .6), 19 (FIGS. 6, 7 and 8) and along the axis of the well when rolling dies along inclined planes 7 (FIG. 5). Due to the difference in the outer diameters of the dies 17 (FIG. 6) and 18 (FIG. 6), a torque arises on the housing 6 (FIG. 5), pressing the upper end of the wedge 1 against the borehole wall 27. Upward movement of the cylinder 10 (FIG. 5 ), bushings 14 with dies 17 (Fig. 8), 18 (Fig. 6), 19 (Figs. 6, 7 and 8) cause compression of the spring 23 (Fig. 5). The upward movement of the cylinder 10 is limited by the emphasis of the protrusion 13 of the cylinder 10 into the protrusion 8 of the cylindrical surface 9. The axial load on the shear element 25 by the weight of the drill pipe string (not shown) is used to simultaneously jam all rows of dies 17 (Fig. 8), 18 (Fig. 6 ), 19 (FIGS. 6, 7 and 8) between the inclined planes 7 (FIG. 5) and the inner wall surface of the casing of the well 27, ensuring that the wedge diverter is fitted with a shear element 25 and the hose 4 cut off, while the wedge diverter is angled to the axis of the well 27. Yes its riber (not shown) moves along the working surface 2 of the wedge 1 down, milling the wall of the casing of the well 27. Under the action of axial load when rolling the dies 17 (Fig. 8), 18 (Fig. 6), 19 (Fig. 6,7 and 8) along inclined surfaces 7 (FIG. 5) with vibration from the cutting force of the casing wall of the well 27, a tight fixed fit of the wedge diverter is provided. With an increase in axial load, the reliability of landing of the wedge diverter, that is, the engagement of the dies 17 (Fig. 8), 18 (Fig. 6), 19 (Figs. 6, 7 and 8) over the walls of the well 27 (Fig. 5) increases. If you need to remove the wedge diverter from the well after finishing work with the drilled additional well, you should hook the upper part of the guide wedge 1 (Fig. 5) with a fishing tool (for example, a "bell") and pull it up. Due to the upward movement of the inclined surfaces 7 of the housing 6, the dies 17 (Fig. 8), 18 (Fig. 6), 19 (Figs. 6, 7 and 8) will roll along the inner surface of the casing wall of the well 27 (Fig. 5) and along inclined surfaces 7 of the housing 6, this will wedge dies 17 (figure 4), 18 (figure 2), 19 (figure 2, 3 and 4), which with the sleeve 14 (figure 3) under the action of a compressed spring 23 resting on the protrusion 24 of the housing 6, will move together with the cylinder 10 (Fig. 1) down to the stop of the protrusion 22 in the protrusion 8 of the cylindrical surface 9, that is, the layout is in the transport position for echeniya from the hole 27.

Reliability of installing a wedge removable deflector is ensured by jamming the dies between the borehole wall and the inclined surfaces of the body while simultaneously forcing the upper end of the deflector against the borehole wall with the side of the opposite working surface of the wedge deflector. Saving material, energy, labor and time is achieved during the construction of wells by repeated use of one set of wedge removable diverter of the proposed design. The hose and shear element are consumables when installing a wedge removable diverter. When installing a wedge removable deflector, only one shear element is used, the cutting force of which can vary over a wide range. The shear element is used only for delivery of the wedge removable deflector to the window cutting interval, and the installation of the wedge removable deflector is controlled by the change in the weight of the drill pipe string and the pressure jump in it due to the cut of the high pressure hose. Using a wedge removable diverter of the proposed design during the construction of multilateral wells, the main trunk is left open, which allows production from both the main and all additional shafts.

Claims (1)

A wedge removable deflector, including a guide wedge with a working surface, a groove located on the opposite side of the working surface for accommodating a high pressure hose and a chamber in communication with the high pressure hose and located at the bottom of the wedge, and a support assembly with inclined surfaces tapering from top to bottom , under retractable rams, with a housing rigidly connected to a guide wedge, whose internal axial cavity is in communication with the wedge chamber, and a cylinder with a piston, whose supra-piston cavity is in communication with the cavity of the housing, characterized in that the inclined surfaces are made in the form of a multifaceted prism made on the outer surface of the housing, the lower surface of which is made cylindrical with a fixed piston, the outside of which is a cylinder made with the possibility of limited movement upward on the cylindrical surface of the housing, while outside the prism with the possibility of limited longitudinal movement upward and interaction from below with the cylinder, a hollow spring-loaded hollow bushing equipped with uniformly around the perimeter and height with radial windows with axles for the dies, made with axial holes with a diameter exceeding the diameter of the corresponding axis by an amount not less than the maximum possible radial movement of the dies, and the dies are made of different diameters that simultaneously interact with the walls of the well during installation so that the upper part of the wedge, the side opposite the working surface, interacted with the wall of the well.

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