Downhole drilling motors

 

The invention relates to techniques for drilling and repair of wells, namely to screw downhole motors. An object of the invention is to improve the reliability of the downhole motor for drilling horizontal wells with a small radius of curvature of the trunk, as well as simplifying its Assembly and disassembly. A downhole mud motor consists of a motor section including a housing with a stator, the rotor and the top sub; a reference node, including housing, transmission output shaft; a sub connecting, hinge or torsion. The sub has two connecting zones L1 and L2, the zone of reduced rigidity of the bending length L, and wall thickness of the sub in the zone L is less than the wall thickness of the sub zones L1 and L2. When the engine is in the curved section of the borehole due to the Flexural rigidity less than the other external elements of the design, will be bent connecting sub, which will create favorable conditions for a pair of rotor - stator propulsion section and for radial and axial bearings, the spindle section. Implementation of the present invention will eliminate the occurrence of cracks and subsequent scrapping of body parts and increase the working life of the downhole ttp://img.russianpatents.com/img_data/85/856600.gif" border="0">

The invention relates to techniques for drilling and repair of wells, namely to screw downhole motors used to drive the drill bit during drilling and workover directional and horizontal wells.

Known downhole drilling motors for repair of wells (see Balenko D. F., Balenko F. D., Gnoevykh A. N. Screw downhole motors. - M.: Nedra, 1999, S. 33-43) that contains one or more motor sections, comprising a stator consisting of a metal chassis and internal helical teeth of the elastomer, and placed inside a metal stator rotor with external teeth, which are in constant contact with the internal teeth of the stator, and the number of teeth of the stator on one more than the number of teeth of the rotor, the reference node (spindle section), including housing components, output shaft, axial and radial bearings, hinge or a torsion bar connecting the rotor of the motor section and the output reference node (spindle section), transmission connecting the motor stator section and encasing the element reference node (spindle section).

Its disadvantage is the increased rigidity of the sub connecting the motor stator section is abingo engine through curved sections of the borehole when the operations running, lifting. At the same time when the engine is in the curved section of the borehole due to the curvature of the stator power section increase of the contact load in a pair of rotor - stator and, as a consequence, increased wear of the stator and the rotor, and due to the curvature of hull elements of the reference node (spindle sections) increase the load on the radial and axial bearing, which leads to premature failure.

This disadvantage is partially removed in the downhole motor is described in Russian patent No. 2007534 and used as a prototype. This engine, which contains a single or multiple motor sections, comprising a stator located inside of the stator, the rotor with external teeth, which are in constant contact with the teeth of the stator, and the number of teeth of the stator on one more than the number of teeth of the rotor, the reference node (spindle section) that includes a housing and an output shaft, a hinge connecting the rotor and the output shaft, or the hinges connecting the rotor and the output shaft and connecting the rotors of the motor sections, provided with a rubber sleeve that connects the motor stator section and the body reference node and/or the stator of the motor sections.

Known downhole mud motor with a rubber sleeve is x wells with a small radius of curvature of the trunk, but this sub has insufficient reliability of the engine in the well. This is reflected in low wear rubber sleeves compared to, for example, with a metal sub in conditions of intense friction in the wellbore when the operations running, lifting, insufficient rigidity of the rubber sleeve in the axial direction in comparison with metal sub, which can lead to buckling of the engine and the rubber sleeve is difficult to manufacture, Assembly and disassembly during scheduled repair of the engine due to the inability to use standard equipment for screwing and unscrewing the threaded connection of the downhole motor due to its specific design.

The technical objective of the claimed invention is to improve the reliability of the downhole motor for drilling horizontal wells with a small radius of curvature of the barrel in terms of intense friction in the wellbore, as well as simplifying its Assembly and disassembly during routine maintenance.

The solution of this problem is the fact that in the known screw downhole motor, containing one or more dvigatel other, having external teeth, which are in constant contact with the internal teeth of the stator, the support site, including housing components and the output shaft, the connection elements connecting the rotor of the motor section and the output shaft between the reference node and/or the rotor of the motor sections, transmission connecting the motor stator section and encasing the element reference node and/or the stator of the motor sections, made in the form of a hollow metal cylinder and has two connecting zones L1 and L2, which are located at the ends of the sub and connect the motor stator section of the shell element reference node and/or stators of motor sections, and in between in the middle part of the sub area of reduced stiffness bending L, the thickness of the walls of the sub in the zone of reduced rigidity bending L is less than the wall thickness of the sub in the connecting zones L1 and L2, which is determined by the difference between the outer and inner diameters of the sub in these areas, for example:

a) the outer diameter D of the sub in the zone of reduced rigidity bending L is smaller than the outer diameters D1, D2 in the connecting zones L1 and L2, i.e.,

D<D1, D2,

with equal inner diameters of the zones nutrena diameters in the connecting zones L1 and L2, i.e.

d>d1, d2,

when equal to the value of the outer diameters of the zones L, L1 and L2, i.e.,

D=D1=D2;

C) the outer diameter D of the sub in the zone of reduced rigidity bending L is smaller than the outer diameters D1, D2 in the connecting zones L1 and L2, i.e.,

D<D1, D2,

and the internal diameter of the sub in the zone of reduced rigidity bending L is larger than the inner diameters of the connecting zones L1 and L2, I. e.

d>d1, d2.

In Fig.1 shows a downhole mud motor.

In Fig.2 presents the sub connection made with different external diameters in the zones L, L1, L2.

In Fig.3 shows the connecting sub, made with different inner diameters of the zones L, L1, L2.

In Fig.4 shows the connecting sub, made with different outer and inner diameters of the zones L, L1, L2

A downhole mud motor (Fig.1) consists of a power section including a stator 1, a rotor 2 and the upper sub 3, the reference node, including Cabinet element 4, encasing element 5, the output shaft 6, the connecting sub 7, the hinge or the torsion bar 8.

In Fig.2, 3, 4 the sub connection. Sub connection has an area of reduced stiffness in bending length L and two connec the than in the area of L it is always less than in the zones L1 and L2, which provides elastic deformation of the sub connection with the drilling of horizontal wells with a small radius of curvature of the trunk, without compromising the reliability of the downhole motor. Different wall thickness in the zones L, L1 and L2 of the sub connection is provided by performing outer diameters D, D2, D3 and internal d, d1, d2 different sizes. The presence of zones, in particular, the connecting L1 and L2, allows the use of standard equipment in disassembly and Assembly of the downhole motor when it is scheduled repairs.

Sub connection made of metal, which ensures the rigidity of the downhole motor in the axial direction, enhances reliability during drilling in conditions of intense friction of the barrel when the operations of the lifting-lowering and increases the wear resistance of the connecting sub compared to the prototype, where sub is a rubber sleeve.

A downhole mud motor operates as follows.

The column of drill pipe is attached to the upper sub 3 (Fig.1). Coming through the pipe drilling fluid while passing through dwigatelnoe what about the shaft 6 the reference node by means of the hinge or torsion bar 8. To the output shaft 6 is attached rock cutting tool (Fig. not shown). The stator 1 of the motor section is connected with the housing element 5 reference node using the connecting sub 7. Cabinet element 5 is connected with the housing element 4.

When the engine is in the curved section of the borehole due to the Flexural rigidity of the connecting sub in the zone of reduced rigidity bending L, which is considerably less than other exterior design elements, will be bent connecting sub, which will create favorable conditions for a pair of rotor - stator propulsion section and for radial and axial bearings, the spindle sections, since the stator housing and the housing support unit (spindle section) will remain straight.

Implementation of the present invention will eliminate the occurrence of cracks and subsequent scrapping of body parts and will improve the work life of screw downhole motors in drilling and repair of deviated and horizontal wells.

Claims

1. Downhole drilling motors, containing one or more motor sections, comprising a stator having internal helical teeth and RA the morning teeth of the stator, the reference node, including housing components and the output shaft, the connection elements connecting the rotor of the motor section and the output shaft between the reference node and/or the rotor of the motor sections, transmission connecting the motor stator section and the body reference node and/or the stator of the motor sections, characterized in that the sub is made in the form of a hollow metal cylinder and has two connecting zones L1 and L2, which are located at the ends of the sub and connect the motor stator section of the shell element reference node and/or stators of motor sections, and in between in the middle part of the sub area of reduced stiffness bending L, the thickness of the walls of the sub in the zone of reduced rigidity bending L is less than the wall thickness of the sub in the connecting zones L1 and L2, which is determined by the difference between the outer and inner diameters of the sub in these zones.

2. The engine under item 1, characterized in that the outer diameter of the sub in a reduced bending stiffness L is smaller than the outer diameter of the connecting zones L1 and L2.

3. The engine under item 1, characterized in that the inner diameter of the sub in the zone of reduced rigidity bending L pain the initial diameter of the sub in the zone of reduced rigidity bending L less than the outer diameter of the connecting zones L1 and L2, and the inner diameter of the sub in the zone of reduced rigidity bending L is larger than the inner diameter of the connecting zones L1 and L2.



 

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