Replaceable support-and-centering member

FIELD: oil and gas well drilling equipment with the use of hydraulic downhole motors.

SUBSTANCE: support-and-centering member is made as metal hub with blades connected to spindle connector. Spindle connector has support cone formed on outer surface thereof and adapted to provide rigid connection with metal hub from inner surface thereof. Support cone of the connector is formed from side of conical thread connecting spindle body with connector. Spindle connector has splines to connect thereof with metal hub. Metal hub is pressed with pressing cone, retaining washer and nut from another side thereof. Metal hub may be installed concentrically or eccentrically to spindle connector axis or outer surface thereof may be differently shaped and arranged eccentrically, concentrically or obliquely with respect to spindle connector axis.

EFFECT: reduced costs of spindle usage.

5 dwg

 

The invention relates to the field of drilling downhole motors.

There are various musculo-centering elements, which are designed to control the Zenith and azimuth angles well, and also to stabilize the wellbore[1, 3, 4].

The known reference-centering elements, typically in the form of a rigid structure or on the housing of the downhole motor, or as a separate element, embedded in the string of drill pipe or the design of the bottom of the drill string.

The disadvantages of the known devices should be attributed that to change, you need to spend a lot of time and have to drill the necessary equipment. For example, when set or decreasing Zenith angle is used spindle with eccentric plate, and to stabilize the angle of the spindle smooth or with a centering element. And on the rig must be several spindles to perform the various process steps.

In addition, when using spindles-diverters have transfer axis removed from the bit, there is a decrease in efficiency and an increased fluctuation of axial load on the deflecting force acting on the bit that allows you to get the actual radius of curvature of the trunk close to the settlement.

Sustentare reference-centering element, performed on the nipple of the spindle, the clamp on the rubber frame CDC [2].

Reference-centering element on the nipple spindle includes rubber-metal bearing located on the inner surface of the nipple, the centering element, provided with rigid blades and one replacement rubber blade, and mounted rigidly between the housing of the downhole motor and the nipple ring with screws attached to the support-centering element.

The disadvantages of the known device should include the unreliability of construction: bolted joints, which in the best case can withstand the tear and slice several tons, at a time when tripping axial loads can reach hundreds of tons. Furthermore, the presence of the shaped ring, to which is attached the supporting-centering element overlaps a significant portion of the annular space of the well. Even in the case when the reference-centering element is removed from the nipple of the spindle.

As a prototype of the selected control-centering element made in the form of a metal sleeve with blades associated with the nipple spindle, having on the outer surface of the thrust cone for rigid connection with a metal sleeve on its inner surface [5].

The disadvantages of the known device ledue is attributed to large linear dimensions, and having bearings in the environment of the mud, and, as a consequence, rapid wear and failure.

The objective of the proposed technical solution is the saving of material and financial resources for the maintenance of spindles designed to perform the various process steps.

This goal is achieved by the fact that reference-centering element made in the form of a metal sleeve with blades associated with the nipple spindle, having on the outer surface of the thrust cone for rigid connection with a metal sleeve on its inner surface, the thrust cone valve spindle is made from a conical thread connecting the spindle body with the nipple, and the nipple spindle is splined for connection with the metal sleeve, and with the opposite end of the metal sleeve pojeta pressure cone, lock washer and nut, and the metal sleeve is made with possibility of installation relative to the axis of the valve spindle concentric or eccentric and its the outer surface may have a different geometric shape and to be concentric, eccentric or at an angle, eccentric and at an angle relative to the axis of the valve spindle.

Comparative analysis of the claimed device with known allows you to set the number of otlicials the x signs.

First, the thrust cone valve spindle is made from a conical thread connecting the spindle body with a nipple that allows complex operations to change the reference-centering elements.

Secondly, nipple spindle is splined for connection with a metal sleeve that allows you to transfer large largest torque from the spindle on a replaceable sleeve, because under conditions of high dynamic loads only splined connection with the failure cone surface, can cope with this task.

Thirdly, replaceable sleeve relative to the axis of the nipple, are concentric and the outer surface of the replaceable bushings may have a different geometric shape and is concentric relative to the axis of the nipple, eccentric or at an angle, or both the eccentric and at an angle, which contributes to production of a large variety of geometric forms and methods of their installation near rock cutting tool.

Thus, the proposed device has not only the new elements, and new relationships between elements.

In figure 1, 2, 2a, 3, 4 presents diagrams removable reference-centering elements on the nipple of the spindle.

Figure 1 presents a diagram of the device with replaceable anchor-centering element, the outer the surface of which can be set concentric with the axis of the nipple.

The device consists of a valve spindle 1, provided with a thrust cone and slots, replaceable sleeve 2, the pressure of the cone 3, the locking washer 4 and nuts 5.

Figure 2 and 2a presents a cross-section removable reference-centering elements, concentric about the axis of the nipple (2) and eccentricity (2A) - eccentric strap.

Figure 3 shows a variant of the device with a smooth sleeve, which is used for stabilization of the Zenith angle, and for inversion and lapel tapered threads, which connect the housing and the nipple.

Figure 4 presents a diagram of the device with replaceable oprano-centering element, the outer surface of which is performed according to the type curve of the sub.

The Assembly of the device is performed as follows. In accordance with the required technology drilling operation: set or decreasing Zenith angle or stabilization of straight-line plot on the nipple 1 spindle is set corresponding to the replaceable sleeve 2. To replace one sleeve to another, you need the spindle shaft is set on the rotor or capture Klinova the grip, bend the tabs of the locking washer 4 and using the key Unscrew the nut 5. Removable sleeve 2 slots together with pressure cone 3 slides nipple spindle 1 and in its place insert another removable sleeve 2, which is pressing the I pressure cone 3, and the whole system is delayed lock washer 4 and a nut 5.

To stabilize the angle recommended replacement sleeves, made in the form of three-a six-bladed centralizers.

For a set and decreasing Zenith angle, it is advisable to use bushings with different angles of inclination of the outer surface to the axis of the nipple, as well as replaceable sleeve with different values of the eccentricity relative to the axis of the nipple (supporting elements).

For very heavy set and lower Zenith angles you can use replaceable sleeve in which there is an eccentricity relative to the axis of the nipple and the outer surface of the replaceable sleeve angled α, which varies from 0° to 3° 30'.

For stabilization of the azimuthal angle, it is advisable to use a replaceable sleeve concentric or eccentric with one, two or more blades. It should be stated that the use of replaceable sleeve with one blade makes the system statically unstable, and in the event of a reactive torque on the housing of the downhole motor sleeve seeks to find a second point of support. Therefore, to stabilize the azimuthal angle is better to use a replaceable sleeve with two or three eccentric or concentric blades, which will eliminate the effect of "yaw" barrel on the azimuth angle, since the resulting force is always directed by the parallelogram rule of addition of forces.

It is advisable to note that in addition to performing its primary purpose installation of bushings on the nipple spindle contribute to a better functioning of all downhole motor, as it allows to reduce the dynamic loads in the radial direction.

Similarly, the proposed device on the nipple spindle you can use this solution in the design of the bottom of the drill string, for example on the upper sub spindle, downhole motor, etc.

Technical appraisal and economic benefits of the proposed device in comparison with the prototype concluded that the rig to perform the various process steps can be used only one spindle instead of two or three. In addition, the proposed solution can be successfully implemented when using a downhole motor dimensions 195 mm and the bit 215,9 mm, without any deterioration of the hydraulic situation in the area of the device. To use the well-known solution in the specified combination is simply impossible because of the overlapping part of the annular space.

It should be also noted that the execution of a removable reference-centering elements along with Bush significantly increases reliability and virtually eliminates the possibility of failure of the sleeve when the General is to be treated for the cause of the destruction.

THE LIST OF REFERENCES.

1. The Johansen C.V. Sputnik drilling", ed. 3., M., Nedra, 1990.

2. Proceedings of VNIIBT "Temporary regulation on prevention of curvature wells, M., 1967.

3. RD 39-0148052-514-86 "regulations for the prevention of curvature vertical wells", M., 1986.

4. RD 39-2-810-83 "Instructions for drilling directional wells", M., 1983.

5. Avts of the USSR №314874 And class. E 21 In 4/02, 1999

Reference-centering element made in the form of a metal sleeve with blades associated with the nipple spindle, having on the outer surface of the thrust cone for rigid connection with a metal sleeve on its inner surface, characterized in that the thrust cone valve spindle is made from a conical thread connecting the spindle body with the nipple, and the nipple spindle is splined for connection with the metal sleeve, and with the opposite end of the metal sleeve pojeta pressure cone, lock washer and nut, and the metal sleeve is made with possibility of installation relative to the axis of the valve spindle concentric or eccentric and its outside surface may have a different geometric shape and to be concentric, eccentric or at an angle or eccentric and at an angle relative to the axis of the valve spindle.



 

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