Downhole drilling motors

 

The invention relates to the drilling technique, namely, the technical means for drilling directional and horizontal wells. Summary of the invention in that in the known screw downhole motor containing spindle with axial and radial bearings and motor section at the bottom of the spindle is installed combined radial bearing slides reliability, consisting of elastic sliding bearing with work surfaces, one of which is made of metal and the other element of an elastic material and sliding support from the hard work surfaces, which are mounted above the elastic sliding bearing, and the length of the working surfaces of the elastic sliding bearing is not less than 1.5 times the length of the working surfaces of the rigid sliding bearing, in addition, the radial clearance in the pair of working surfaces of the elastic sliding bearing is equal to or less than the radial clearance in the pair of working surfaces hard sliding bearing. The invention provides the improvement of technical and economic indicators of well drilling by minimizing the deviation of the wellbore from the predetermined trajectory and increase durability. 3 C.p. f-crystals, 5 Il.

The drilling of the borehole along a given trajectory is one of the technological problems when posting directional and horizontal wells. Currently, this task can be solved with the use of downhole motors, having in its composition spindle section with a set of axial and radial bearings, centralizer, curved or adjustable sub.

Known downhole drilling motors 2-195 (Balenko D. F. and others reference manual “Screw downhole motors”. - M.: Nedra, 1999, S. 35. UDC 622.24.05 (031), BBK 26.2).

The disadvantage of this downhole motor is insufficient rigidity of the lower radial rubber-metal bearings in the spindle section.

Under the action of radial loads on the bit, resulting in the drilling process there is a change in radial clearance in the bearing due to the collapse of the rubber lining in the outer sleeve, and a further increase of the gap in the support due to intensive wear of the working surfaces of the radial bearings with a large departure bits from the radial bearings.

For this reason, to influence the stabilization of the parameters of the curvature is a and azimuth on the drilled section of a borehole and, as a consequence, to change setting drilling or layout of the engine when the deviation of the hole from the specified coordinates.

Known downhole drilling motors containing spindle with axial and radial bearings and motor section, designed for drilling directional and horizontal wells (see Balenko D. F. and others reference manual “Screw downhole motors”. - M.: Nedra, 1999, S. 37). Use in downhole motors rigid radial bearings “metal to metal” as a result of the deflecting force on the bit during drilling is skewed bushings radial bearings, intense and uneven (local) wear of working surfaces. Radial bearings “metal-metal”, when they are set in the lower part of the spindle sections, have low durability, which determines the turnaround time of the engine as a whole.

The present invention is to increase the technical and economic indicators of well drilling by minimizing the deviation of the wellbore from the predetermined trajectory and increase durability.

The goal of the project is achieved in that in the known screw downhole motor containing spindle with axial and radial is made of combination, includes sliding bearing with hard work surfaces and elastic sliding bearing with work surfaces, one of which is made of metal and the other element of elastic material. Bearing slide with hard work surfaces mounted above the elastic sliding bearing, and the length of the working surfaces of the elastic sliding bearing is not less than 1.5 times the length of the working surfaces of the rigid sliding bearing. In addition, the radial clearance in the pair of working surfaces of the elastic sliding bearing is equal to or less than the radial clearance in the pair of working surfaces hard sliding bearing.

Due to the distinctive design features of the invention, in comparison with the prototype, we offer a downhole mud motor helps to keep the parameters of the curvature of the wellbore within the prescribed limits and to drill deviated and horizontal wells without labor.

In the present invention, unlike the prototype, due to the fact that the bearing is made of a combination, the radial load on the combined radial bearing of the spindle of the downhole motor is distributed between elastic and rigid supports of Colusa, which consequently reduces wear on the working surfaces of the bearings and the rate of increase of radial play of the shaft, thereby increasing the durability of the engine.

In Fig.1 shows a General view of the downhole motor (motor section); Fig.2 - General view of the motor (spindle) of Fig.3 shows in section a combined radial bearing 10 (Fig.2) in an enlarged scale; Fig.4 is a cross section a-a of the elastic sliding bearing; Fig.5 - cross section b-B hard sliding bearing.

A downhole mud motor (Fig.1-2) consists of sections of motor 1 (Fig.1) comprising a stator 2 and placed inside the stator, the rotor 3, the coupling 4, the flexible shaft 5, the adapter 6, sub 7 and the connecting sub 8, and the spindle 9 with the combined radial support 10. The spindle 9 includes a hollow body 11 in which is located the shaft 12 installed on it combined radial bearings 10, consisting of elastic sliding bearing 13, a rigid sliding bearing 14, the axial bearing 15, the upper support 16 with the sleeve 17 and is connected with the shaft 12 swivel coupling 18. The housing 11 is connected to the nipple 19 (Fig.3) elastic support 13, sub 20 and curved sub 21 with an angle of curvatureusing the data of the radial bearing 10 shown in sections in Fig.2 and 3. Cross section a-a of the elastic sliding bearing 13 is shown in Fig.4. On the shaft 12 mounted sleeve 23 with hardened work surface 24 (Fig.4). The sleeve 23 is placed in the nipple 19, having on the inner surface of the plate 25 has a cylindrical shape from an elastic material (Fig.4). Above the elastic sliding bearing 13 posted by hard bearing slide 14, consisting of outer ring 26 and the inner sleeve 27.

Cross section b-B hard sliding bearing 14 with hardened work surfaces 28 and 29 shown in Fig.5.

Outer ring 26 hard sliding bearing is installed in the housing 11 of the spindle 9, and the inner sleeve 27 is placed on the shaft 12. The working surface 29 of the shroud 26 covers the working surface 28 of the inner sleeve 27.

In Fig.3 shows a length of 30 working surfaces 24 and 31 (Fig.4) elastic sliding bearing 13 and a length of 32 working surfaces 28 and 29 (Fig.5) hard sliding bearing 14.

In Fig.4 shows the radial gap 33 in the pair of working surfaces 24 and 31 of the elastic sliding bearing 13 permitting under the action of radial force radial displacement of the sleeve 23 relative to the valve 19 due to the deformation of the elastic material of the sheath 25 and the return of the sleeve in coaxial position with tsatsoline 14.

For the radial bearing combination, shown in Fig.2 and 3, includes a sliding bearing with hard work surfaces and elastic sliding bearing with work surfaces, one of which is made of metal and the other element of elastic material allows you to place the radial bearing in the immediate vicinity of the bit, resulting in less deformation of the shaft 12 under the action of bending moment of force produced on the bit when drilling a deviated section of the wellbore and the creation of conditions, when the radial load on the working surfaces 28 and 29 hard sliding bearing 14 will be uniformly distributed along its length 32 without causing excessive local wear of working surfaces. Elastic bearing slide 13 having a lining 25 of elastic material in this case is the damper, perceiving radial shock load from the reaction of slaughter.

The establishment of a sliding bearing with hard work surfaces above the elastic sliding bearing, increases the wear resistance of radial bearings and the preservation of the original radial play of the spindle shaft.

In addition, the run length 30 working surfaces 24 and 31 of the elastic Opera 14 1.5-2 times, and radial gap 33 in the pair of working surfaces 24 and 31 of the elastic sliding bearing 13, as shown in Fig.4 is equal to or less than the radial gap 34 in the pair of working surfaces 28 and 29 hard sliding bearing 14 limiting radial displacement of the sleeve 23 and the inner sleeve 27 in elastic and rigid support slide relative to the nipple 19 and the sleeve 26, which reduces wear of the radial bearings, increasing durability and technical-economic indicators of drilling.

We offer a downhole mud motor operates as follows. To sub 7 (Fig.1) is attached column of drill pipe leading from the pump into the engine under pressure working fluid.

The helical teeth of the rotor 3 and the rubber lining of the stator 2, made according to special geometry are in continuous contact form mud on the step length of the stator unit of the camera. The rotor 3 under the action of unbalanced hydraulic forces rotates inside the stator 2, objetivas in the teeth of the stator plates.

The planetary motion of the rotor 3 is converted into an axial rotation of the shaft 12 of the spindle 9 by means of a flexible shaft 5 and the hinge coupling 18, the transmitting torque from the rotor 3 dvigatelnoi 1 and the spindle 9 with a curved angle(Fig.2) sub 21 for drilling a well bore in a predetermined path in the lower part of the spindle 9 are combined radial bearing 10, a longitudinal section of which is shown in Fig.2 and 3.

The advantages of the proposed downhole motor with a combined radial support of increased stiffness in the spindle is that by placing a rigid sliding bearing with a given ratio of the lengths of the working surfaces and radial clearances in the joints, an optimum load distribution on the surface of the friction pairs bearings, increasing their durability and the preservation of the original radial play of the spindle shaft, which is especially important when drilling directional wells, when the bits are high lateral loads.

Alignment of unit loads on the working surfaces of rigid and elastic bearings forming part of a combined radial bearings increases its reliability, durability and rigidity when exposed to lateral forces on the protruding end of the spindle shaft. Elastic support is also damper, perceiving radial shock load from the bit. The downhole motor for drilling deviated nab the technical and economic indicators of drilling wells.

Industrial testing of the downhole motor, consisting of a motor section and spindle with a bent sub and installed in the lower part of the spindle combined radial bearings showed that all kinds of technological operations during the drilling of directional wells in areas of changing the direction of the wellbore is carried out in a predetermined path with high accuracy and efficiency.

Claims

1. Downhole drilling motors containing spindle with axial and radial bearings and motor section, characterized in that mounted in the lower part of the spindle radial bearing is made of a combination that includes a sliding bearing with hard work surfaces and elastic sliding bearing with work surfaces, one of which is made of metal and the other element of elastic material.

2. Downhole drilling motors under item 1, characterized in that the bearing slides with hard work surfaces mounted above the elastic sliding bearing.

3. Downhole drilling motor according to any one of paragraphs.1 and 2, characterized in that the length of the working surfaces of the elastic sliding bearing is not less than the about any of paragraphs.1-3, characterized in that the radial clearance in the pair of working surfaces of the elastic sliding bearing is equal to or less than the radial clearance in the pair of working surfaces hard sliding bearing.



 

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