RU2444604C1 - Well deviation device - Google Patents

Abstract

FIELD: mining. ^ SUBSTANCE: well deviation device includes rock-destructing tool, downhole motor with a shaft and housing, and deflection element installed on lower end of downhole motor housing. At that, deflection element is made in the form of upper and lower sleeves adjacent to a gap by means of their lower and upper splined inclined end surfaces with possibility of adjusting the deflection angle by means of restrictors installed into the gap. Upper sleeve is equipped with an arrester and replaceable breaking out supports of variable height, which are located on opposite side from the restrictor for prevention of the layout from the action of rotary moment of the bit. Inside the deflection element there installed is shaft of splined hinge assembly, which has hemispherical end surface and is connected to the motor shaft by means of housing of splined hinged assembly and splined assembly with possibility of its back movement in axial direction, and to rock destructing tool by means of a half-hinge and an adapter. And restrictors installed into a gap can be made in the form of support washers. ^ EFFECT: increased smooth and adjustable drift angle in the design range, high and stable intensity of i curvature, accurate construction of shaft according to the optimum calculated well profile, drift angle at the specified interval of the shaft at maintaining the layout straightness at its lowering and lifting.

Description

The invention relates to the field of well construction in the exploration and exploitation of oil and gas fields.

The device is known as “Curved sub” installed above the downhole screw motor, at a distance of 3-4 meters above the bit, which does not provide an intensive set of curvature at the initial interval of drilling an additional shaft (Kalinin A.G., Grigoryan N.A., Sultanov B. Z. Drilling of deviated wells. Reference book. M .: Nedra, 1990, 348 p.). The device is a pipe completely the same length as a conventional sub, with intersecting axes of the connecting threads.

The disadvantage of this device is that it is installed above the downhole motor, which reduces the efficiency of a set of angles. Friction occurs on the borehole wall of the rock cutting tool during tripping operations.

The well-known "Swash angle regulator" with a device for controlling the position of the planes of curvature of the geophore engine (patent RU No. 2358084, publ. 10.06.2009). The regulator contains a curved shaft with external slots, a coupling with end teeth, a top and a curve sub, nasally located between each other, while the coupling is mounted on the slots of the curved shaft, and the upper and the curve adapters are connected to the curved shaft by threads at the edges facing each other. The regulator contains an intermediate shaft with connecting threads and external slots, a clip with a toothed notch at the end, mounted on the outer slots of the intermediate shaft, and a connecting sub with a notched notch at the upper end that interacts with the gear notch of the clip. The intermediate shaft is fastened with threads with the lower edge of the curve sub and the upper edge of the connecting sub. The connecting sub is mounted on the intermediate shaft with the possibility of circumferential displacement relative to the cage and is fastened with a thread with the upper edge of the stator of the gerotor motor.

The disadvantage of this device is that it is installed above the downhole motor, increasing the length and the rigid base of the deflecting BHA, thereby reducing the intensity of the angle.

Known "Adjustable deflecting device" (patent RU No. 2235181, publ. 27.08.2004). It includes a curved shaft with external slots, a curve sub mounted between the spindle and the stator of the multi-start gerotor mechanism, which provides a single-plane bending of the downhole motor.

The disadvantage of this device is that it requires a certain change in the design of the engine in order to ensure that its body is skewed on the day surface, which complicates its descent into the wellbore and leads to wear of the rock cutting tool during the descent.

It is known “Device for skewing parts of a downhole motor” (patent RU No. 2108437, publ. 04/10/1988), containing an actuator included in the telemetry system having a position sensor, the latter is in contact with a spool located in the stem of the hydraulic chamber (servocylinder) and connected to traverse of the pipe, which ends with a wedge. The latter interacts with a deflecting support on the same pipe, which partially covers the upper section of the downhole screw motor, connected by a sub and a centralizer with a chisel.

The disadvantage of this device is that it does not provide stable curvature (set of curvature), since the value of the skew angle of the deflecting part of the downhole screw motor varies depending on the design - the broadening of the wellbore.

The well-known "diverter for directional downhole drilling" (ed. St. SU No. 821678, publ. 04/15/1981). The diverter contains a sub connected to the drill pipe, a sleeve installed in the sub using splines. The sub and the sleeve have axial movement relative to each other. The lower end of the sleeve is made in the form of an inclined plane. The nipple consists of a glass and a shaft, interconnected pivotally using a spherical surface that provides angular movement of the mating parts. Slots are made on the shaft, interacting with the splines of the sleeve. At the end of the shaft there is a self-braking thread interacting with a locking nut connected to the sub with a self-braking thread. When setting the layout with the engine on the bottom of the well and transferring the axial load, the sub moves relative to the sleeve until it stops. In this case, the locking nut is twisted on the shaft and tightens the ends of the glass and sleeve. This creates a skew of the deflector with the engine and a deflecting force arises on the bit, which ensures the bending of the well.

The disadvantage of this device is that it is located above the downhole motor, which reduces the intensity of the angle.

It is known “Device for curving a well” (patent SU No. 1159998 A, publ. 7/10, 1973), taken as a prototype. The device comprises a rock cutting tool, a downhole motor with a shaft and a housing, a radially extendable spring-loaded deflecting element mounted on the upper end of its housing, a deflecting element directed at the diametrically opposite side mounted on the lower end of the downhole motor housing. In order to increase the accuracy of directional drilling, the deflecting element is made retractable in the radial direction and spring-loaded relative to the housing, and the deflecting elements are equipped with nodes for their fixation in the working position. Each of the fixation nodes of the deflecting elements is made in the form of a spring loaded sleeve with a cam mounted for rotation on the shaft of the downhole motor for interaction with the deflecting element and a turbine rigidly connected to it. Moreover, on the sleeve and on the inner surface of the downhole motor housing there are protrusions that interact with each other at the maximum interaction of the working element.

The disadvantages of the device are: it is structurally complex and does not provide the ability to control the angle of deviation.

The basis of the invention is the task of developing an adjustable deflecting device, the design of which would provide a smooth and adjustable set of curvature while maintaining the advantage of the straightness of the layout during tripping.

The technical result is the provision of an increased smooth and adjustable set of curvature in the design range, a large and stable curvature intensity i, as well as accuracy of the wellbore according to the calculated optimal well profile of the set of curvature at a given interval of the well while maintaining the advantage of the straightness of the layout during its descent and rise.

The technical result is achieved in that in a device for curving a well containing a rock cutting tool, a downhole motor with a shaft and a housing, a deflecting element mounted on the lower end of the body of the downhole motor, the deflecting element is made in the form of an upper and lower bushings, coupled with a gap of its lower and the upper end face with slotted inclined surfaces with the possibility of adjusting the deflection angle with the help of limiters installed in the gap, the upper sleeve is equipped with a stop and interchangeable fasteners variable height supports located on the opposite side of the stop to prevent the assembly from being influenced by the rotational moment of the bit, a shaft of a splined joint assembly is installed inside the deflecting element, having a hemispherical end surface located in the housing of the splined joint assembly and connected to the motor shaft by means of a splined assembly with the possibility of its return movement in the axial direction, and with a rock cutting tool by means of a half-hinge and sub.

Limiters installed in the gap can be made in the form of support washers.

On figa) shows a device for curving a well in a transport position, on figb) - the same, but in a working offset position.

The device for bending the well includes a housing 1 connected to the outer casing 2 of the downhole motor, the last sub 3 through the spindle of the downhole motor 16 connected to the drill string. The deflecting element mounted on the lower end of the casing 2 of the downhole motor is made in the form of an upper 4 and lower 5 bushings, conjugated with a gap "a" with their lower and upper end splined inclined surfaces, respectively. The existing gap "a" between the upper 4 and lower 5 bushings in the transport position (figa) ensures the straightness of the device for bending the well during the descent and ascent. The ability to control the deflection angle is provided by means of the stops 17 installed in the gap “a”, made in the form of support washers (shown schematically).

The upper sleeve 4 is made with a stop 14 and removable fastening supports 15 of variable height located on the opposite side from the stop 14. The stop 14 allows you to limit the movement of the lower sleeve 5, provides a locking position of the deflecting element. Interchangeable support legs 15 of variable height provide stabilization of the plane of the design direction of the curvature of the well. Replaceable fastening supports 15 of variable height are located on the opposite side from the direction of the deflecting force (from the stop 14) and hold the bottom of the layout from possible circular movement. Supports 15 are made in the form of carbide acute-angle pins. The height of the interchangeable support legs 15 of a variable height varies depending on the desired deflection angle. This design of the deflecting element provides a smooth and adjustable set of curvature at a given interval of the barrel.

The internal composite shaft of the device for bending the well consists of a shaft 9 of a spline assembly 9-10, a housing 10 of a spline assembly 9-10, a housing 11 of a splined joint assembly 11-12 and a shaft 12 of a splined joint assembly 11-12. The shaft 9 is connected to the spindle 16 of the downhole motor, a spring 18 is installed between them. The possibility of a reciprocal movement in the axial direction of the internal composite shaft is provided in this case by the spring 18 and the design of the spline assembly. The housing 10 of the spline assembly 9-10 is connected to the housing 11 of the splined joint assembly 11-12. This design provides a return movement of the composite inner shaft in the axial direction when deflected.

The shaft 12 of the splined joint assembly 11-12 is installed inside the deflecting element (inside the upper 4 and lower 5 bushings) and is made in the upper end part with a hemispherical surface in the form of a rounded splined support head located in the housing 11 of the splined joint assembly 11-12. The shaft 12 is connected to the motor shaft via a splined joint assembly 11-12, a splined assembly 9-10 and a spring 18, and to the rock cutting tool 8 through a half-joint 6-13 and an adapter 7. The lower part of the shaft 12 of the splined joint assembly 11-12 passes through the hole the cover 6, the thrust bearing 13 (through the half-hinge 6-13) and screwed into the sub 7 on the rock cutting tool 8. The half-ball 6-13 ensures the connection of the internal composite shaft with the rock cutting tool 8 and the displacement of the rock cutting tool 8. This composite construction the inner shaft provides a displacement of the shaft 12 in the design direction and the transmission of torque from the downhole motor to the rock cutting tool 8.

The upper sleeve 4 of the deflecting element is mounted on the housing 1. The lower sleeve 5 of the deflecting element 4-5 is mounted on a half-joint 6-13.

A device for curving a well works as follows. A device for bending the well is connected through a sub 3 to the drill string and lowered into the well in a straight position (with a gap "a", Fig. 1, a) to a predetermined depth and oriented in the design direction. Regulation of the design set of curvature is provided by changing the size of the gap “a” as a result of setting the adjusting support washers 17 into the gap “a”, and the curvature plane is marked with a mark on the stop 14. The washers 17 are installed on the stop 14. Then the device for bending the well is installed on the bottom and axial load is transmitted to it. The shaft 12 is shifted downward by means of a splined unit 9-10 until the upper sleeve 4 of the deflecting element closes with its lower sleeve 5 until it stops 14 by the amount of a gap “a” between them, forming an angle γ between the motor axis and the shaft axis of the splined joint assembly 12, position b ) The rock cutting tool 8 is able to laterally oriented movement and create a deflecting force on the wall of the barrel in the design direction to ensure curvature of the well. In this case, the upper sleeve 4 of the deflecting element with two interchangeable fastening supports 15 of variable height cuts into the borehole wall, holding the casing 1 and the casing 2 of the downhole motor from turning in the borehole by a torque on the rock cutting tool 8. The rock cutting tool 8 is moved together with the sub 7, which is resistant the bearing 13, the cover 6 and the shaft 12 of the spline hinge assembly in the hemispherical end surface (rounded spline support head). Rotation to the rock cutting tool 8 is transmitted through the spindle 16 of the downhole motor, the housing 10 of the splined assembly 9-10 and the housing 11 of the splined joint assembly 11-12 to the shaft 12. After the curvature cycle is completed when the drill string is raised, the shaft 12 moves upward in the splined assembly 9-10 and assumes a rectilinear position, the detachment of the deflector 4-5 is stopped, and the rectilinear arrangement is removed from the well.

Thus, the device for curvature of the well provides drilling during exploration and exploitation of oil and gas fields with a smooth and adjustable set of curvature in the design range, a large and stable intensity of curvature i, as well as the accuracy of the wellbore according to the calculated optimal profile of the well of the set of curvature at a given interval trunk while maintaining the advantages of the straightness of the layout during its descent and ascent.

Claims (1)

A device for bending a well containing a rock cutting tool, a downhole motor with a shaft and a housing, a deflecting element mounted on the lower end of the downhole motor housing, characterized in that the deflecting element is made in the form of an upper and lower bushings, coupled with a gap of its lower and upper end splined inclined surfaces with the ability to adjust the deflection angle using limiters installed in the gap, the upper sleeve is equipped with a stop and interchangeable variable support legs height, located on the opposite side from the stop to prevent the assembly from influencing the rotational moment of the bit, a shaft of a splined joint assembly is installed inside the deflecting element, having a hemispherical end surface located in the housing of the splined joint assembly and connected to the motor shaft by means of a splined assembly with the possibility of its return movement in the axial direction, and with a rock cutting tool through a half-hinge and sub.

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