The hinged diverter

 

(57) Abstract:

The invention relates to the drilling of oil and gas wells, namely, controls the trajectory of the drilling wells. The invention consists in that the locking body of the device is made in the form of a slide valve, inside the unit installed managed hydrochory acting on the hollow shaft for changing the direction of drilling, coupled with the hollow spindle shaft has a possibility of deviation from the axis of the housing of the diverter due to the design of the bearings and the spindle is made to rotate in the bearings or ball bearing and bearing standoff on the walls of the well made as installed on the body of the whipstock lower coupling, which profesionaly longitudinal pointed to the top of the slots. The invention provides increased reliability and reducing the cost of drilling operations. 5 Il.

The invention relates to the field of drilling oil and gas wells, and particularly to controls the trajectory of the drilling. Known downhole device for guiding shafts drilling wells without descent devices in the drill pipe for guiding diverters on the calculated azimuth: and. C. from 08. This device includes a housing, a hollow shaft, hydrochory, evenly spaced around the circumference of the housing, the valve system flow distribution of fluid on hydroclean containing the shut-off body is made slidable on the ends of the fittings mounted in the sleeve, hydraulic channels connecting each gidrotamir with the cavities of the housing, managing a pendulum suspended on a thin rod to the clutch and associated with the locking body, and the support of the whipstock at the borehole wall. The device meets the requirements of the control borehole trajectory, but limits the rate of recruitment of curvature of the wellbore up to 2-2,5o10 m of drilling in connection with the rigidity of the bottom of the drill string and the limited output of the reference elements of the device. In addition, as shown by the test device. C. N 1661346, when cutting a "window" in a casing for drilling sidetracks after 8-10 hours of work supporting elements hammered metal filings and become unmanageable.

The aim of the invention is to increase reliability and reduce the cost of drilling operations.

To solve this problem in the hinge whipstock comprising a housing mounted in cor the fluid flow, containing the shut-off body is made slidable on the ends of the fittings mounted in the sleeve, hydraulic channels connecting each gidrotamir with the cavities of the housing, and a control pendulum suspended on a thin rod to the clutch and associated with the locking body, a support standoff on the borehole wall, the locking body in the form of a spool, managed hydrochory mounted inside the housing of the device with the pressure on the hollow shaft for changing the direction of drilling, the hollow shaft is connected to the spindle of the swivel coupling and has the possibility of deviation from the axis of the housing of the diverter due to the design of bearings, and the spindle is made to rotate in samoustraniajutsia and radial-axial bearings or ball bearing and bearing standoff on the walls of the well made as installed on the body of the whipstock lower coupling, which profesionaly longitudinal pointed to the top of the slots.

In the present invention, the hinge rotation of the spindle is set at the end of the device with the possibility of kinking the spindle axis relative to the axis of the device at a considerable angle, which will increase the rate of recruitment of curvature stole pipe, that will reduce the likelihood of slip of a router to cut the ledge with increased load from the weight of the drill string. At large skew angles of the axes is possible milling "Windows" without pre-setting cement plugs.

The proposed device can be used in the turbine and rotary drilling for posting directional, vertical and horizontal wells, oriented cutting of casing and drilling new shafts in operational and emergency wells.

The device illustrated by the drawings, where Fig. 1 shows a longitudinal section of the whipstock of Fig. 2 section a-a in Fig. 1, in Fig. 3-4 position of the working bodies of the whipstock respectively to increase and decrease the angle of inclination of the wellbore of Fig. 5 arrangement of the elements of the mechanism for changing the azimuth direction of the well.

The diverter consists of a casing 1 in which is located the hollow shaft 2 connected to the spindle 3 swivel coupler 4 and through sub 5 with a column of drill pipe or shaft of the downhole motor. The spindle 3 through the transmission 6 is connected with a chisel. The hollow shaft 2 together with the spindle 3 rotates inside the housing 1 by bearings 7, 8, is s 14, reinforced solid alloy. The spindle 3 in the sleeve 13 is rotated on the axial-radial bearing 10 and samoustraniajutsia the bearing 11. The inner ring of the bearing 10 fixedly mounted on the spindle 3 between the outer ring and the inner wall of the coupling 13 to the radius there is a gap, resulting in a bearing 10 radially offset on the size of the gap.

The rear wall of the clutch 13, which supports the bearing 10 has a spherical shape provides constant contact with the bearing outer ring 10 when the deviation of the spindle 3 from the axis of the housing 1. Thus the bearing 10, taking axial load, allows the spindle 3 to deviate from the axis of the housing by a certain amount with the intersection of their axes in the diametrical center of the self-aligning bearing 11. Depending on the size and structure of the device, the angle of bend can be increased to almost any desired size. At large angles of inflection (up to 10o) that is required when cutting a "window" in a casing, the spindle bearings are mounted in a ball bearing 31, Fig. 3.

On the upper end of the hollow shaft 2 has a radial ball bearing 7 and the axial 8, the outer qualcosa the hollow shaft 2 and the housing 1 within the 1owith the intersection of their axes in the center of the bearing 7. To the bottom of the clutch 12 and the screw is fixed to the pipe 15, which forms together with the housing 1 an annular chamber in which the control mechanism trajectory. On the lower end of the pipe 15 from the outside on the thread installed sleeve 16, which is fixed fittings 26. On the sleeve outside diameter mounted rubber seal 17. On the upper end of the pipe 15 from the inner side is set rubber seals 18, sealing the annular gap between the hollow shaft 2 and the inner walls of the pipe 15. The dimensions of the cuff and its elasticity to allow the displacement of the hollow shaft 2 about the axis of the housing 1 2-3 mm, without violating integrity.

The hollow shaft 2 drilled holes 19, through which the flushing fluid enters the longitudinal slot 20 in the sleeve 12 and in the annular chamber of the control mechanism, which consists of a circular pendulum 21, suspended on thin rods 22 to the clutch 12. The pendulum 21 is connected with a thin bolts 23 with the annular valve 24. Bolts 23 to freely slide in the holes of the pendulum 21. Springs 25, dressed to the bolts 23 between the pendulum 21 and the spool 24, dampen vibration and provide a pressure valve to the fittings 26. The pendulum 21, tending to the Zenith of feasts 26. Input the holes in the fittings drilled offset from their axes. Eccentricity allows the inlet to get to the inner or outer wall of the annular chamber. The flushing liquid flows through the nozzles 26 in the tube 27 and through them in hydrochory 28, deflecting the spindle 3 in a given direction.

From the chambers of the fluid constantly flows through the nozzles 29. The diameter of the holes in the jets 3-4 times less than the bore diameter of the fittings. Due to the difference in pressure loss in fittings and nozzles (15-20 times) hydrocorax supported pressure, providing the necessary force on the hollow shaft 2 and the bit in the borehole wall. In the annular chamber formed by the housing 1 and the pipe 15, the pressure is maintained by pressure loss in the nozzle 30, is screwed into the end of hollow shaft 2.

The work of the whipstock as follows. Before lowering the whipstock in the well, depending on the tasks carried out setting the control mechanism: case 1 otsenivaetsya, rises above the sleeve 16.

For increasing Zenith angle of inclination of the well bore fittings 26 in their nests turn the input channels to the outer wall of the annular chamber (Fig. 3). Tube 27 directly (the AMI 12 and 13.

When the axis deviation of the borehole from the vertical at some angle the pendulum 21 is deflected from the axis of the device to the vertical and moves in the same direction of the spool 24, which opens the inlet for washing liquid to the nozzles 26 from the side of the wellbore inclination. Hydrochory 28 filled with the washing liquid, with a force due to the pressure drop across the nozzles 29 to displace the bearing 9, the bottom of the hollow shaft 2, the sleeve 4 and the upper end of the spindle 3 to the wall of the housing 1. When the spindle 3 is rotated in the diametrical center of the self-aligning bearing 11 in the plane and direction of the curvature of the borehole. With the deepening of the borehole inclination angle of curvature will increase.

To reduce the Zenith angle of inclination of the borehole when configuring fittings inlet holes 26 are rotated against the inner wall of the annular chamber (Fig. 4). Channels, as well as in the first case, connected with hidrocharme lying on the same axis (on one line). Managing the pendulum 21, seeking to take a position closer to the vertical, opens the channels on the fittings on the side opposite the direction of curvature of the borehole, and hydrochory 28, pressing the bottom of the hollow shaft 2, and the upper part of the spindle 3 to the wall of the housing, raspolojeny.

To change the azimuth of the direction of curvature of the wellbore at a certain angle to the right or left of the actual direction of the wellbore is necessary when setting up a control mechanism to direct the flow of fluid from the nozzles 26 in hydrochory 28 offset to the calculated angle. In Fig. 5 shows the offset spindle direction from the direction of inclination of the well to the right on the 90o. This is ensured by the length and shape of the tubes 27.

Against rotation in the well, the device is fixed longitudinal slots 14 on the clutch 13, which is pressed against the borehole wall by the reaction caused by the pressing spindle drill on the opposite wall. Simultaneously, the longitudinal shape of the slots allows you to move the device along the axis of the borehole together with a column of drill pipe at a corresponding pressure. When random tangential slippage of the support elements and housings relative to the walls of the borehole, the control mechanism switches hydrochory 28 in accordance with the setting direction of the spindle 3 with respect to the plane of inclination of the wellbore.

The hinged diverter comprising a casing mounted in the housing hollow shaft, evenly spaced around the circumference of the body herotu slip on the ends of the fittings, mounted in the sleeve, hydraulic channels connecting each gidrotamir with the cavities of the housing, and a control pendulum suspended on a thin rod to the clutch and associated with the locking body, a support standoff on the borehole wall, wherein the locking body in the form of a spool, managed hydrochory mounted inside the housing with impact on the hollow shaft for changing the direction of drilling, the hollow shaft is connected to the spindle of the swivel coupling and has the possibility of deviation from the axis of the housing of the diverter due to the design of bearings, and the spindle is made to rotate in samoustraniajutsia and radial-axial bearings or ball bearing and bearing standoff on the walls of the well made as installed on the body of the whipstock lower coupling, which profesionaly longitudinal pointed to the top of the slots.

 

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3 cl, 2 dwg

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