Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1986-03-17
1987-12-08
Goldberg, Howard N.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29434, 29464, 29469, 29720, 29407, 403333, 418 5, 418 48, B23P 1500, B23P 1900, B23Q 1700
Patent
active
047110066
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to drilling equipment and, more particularly, to a downhole sectional screw motor and a method of oriented assembly of working members thereof using a mounting fixture.
DESCRIPTION OF THE PRIOR ART
Downhole screw motors are being increasingly employed in the practice of drilling wells. They are easy to operate and service and have small dimensions (M. T. Gusman, D. F. Baldenko et al., "Downhole Screw Motors for Drilling Wells", Nedra Publishers, Moscow, (1981)).
The length of working members, namely, stators and rotors of screw downhole motors is limited due to technological possibilities of their manufacture. Therefore, specific values of the torque and pressure drop per unit of the length of the working members or one pitch of their screw thread are adequately great.
In the easier drilling conditions involving the flushing of a bottom hole with process water, the screw downhole motors feature high efficiency and fully satisfy the requirements of drill men. However, in most regions there are used drilling muds with a high content of a solid phase, which substantially decreases the service life of the working members and is the factor limiting the universal use of such motors. In Soviet and foreign practice, downhole screw motors are updated by way of increasing the length of the working members (the number of screw pitches) with an eye to diminishing the specific contact loads in the screw pair and, consequently, extending the service life of the working members. Research is conducted in two directions: a long-term development of the technology of manufacturing monolithic multi-pitch constructions of rotors and stators, and the elaboration of methods of sectionalizing the working members of motors.
Today there are known in the art a number of technical solutions associated with the sectionalization of the working members of screw downhole motors.
There is known a method for assembling a sectional screw downhole motor structurally made in the form of two or more sections of the working members, each section comprising a rotor and a stator (cf. U.S.S.R. Inventor's Certificate No. 286502, cl. F04 5/00, 1969).
The sections are connected in the following manner: the stators are connected by means of a threaded bushing and the rotors with the aid of an articulated joint. In the given technical solution the screw surfaces of the connected and like working members may coincide only accidentally. In case of an arbitrary assembly of the working members, when a radial displacement of the adjacent rotors about the axis of the stators is possible in an opposite direction, the operation of the motor features higher radial vibrations because the displacement of the longitudinal axes of the adjacent rotors may be increased to a double eccentricity of the axis of the rotor, relative to that of the stator in a single-section variant of the motor, which leads to the destruction of the threaded joints and possible serious failures in the well, as well as brings about an intensive wear of the contact surfaces of the screw pair due to higher dynamic loads during the motor operation.
There is known in the art a mounting fixture which serves to ensure an oriented assembly of the working members of the screw downhole motor (cf. U.S. Pat. No. 3,982,858, cl. 418-48, 1976).
The fixture comprises a mounting stator and rotor, each being sufficiently long to accommodate on its profile surface the like working members (stators or rotors) being connected to each other.
The mounting stator or rotor has a profile surface adequate to the profile surface of the working members being connected.
The method of assembling the motor resides in that it is the section of the spindle that is assembled first which comprises bearing and packing units. Then the working members of the moving sections are successively assembled, seeing to it that the profile surfaces are oriented in a desired manner. The sequence of oriented assembly is as follows. Two stators, having similar geometrical dimensions of prof
REFERENCES:
patent: 3982858 (1976-09-01), Tschirky
patent: 3999901 (1976-12-01), Tschirky
patent: 4585401 (1986-04-01), Baldenko et al.
"Screw Hydraulic Downhole Motors for Well Drilling", Nedra Publishers, Moscow (1981), pp. 56-57.
Baldenko Dmitry F.
Bezlepkin Nikolai P.
Gusman Moisei T.
Potapov Jury F.
Semenets Valery I.
Goldberg Howard N.
Vsesojuzny Nauchnoissledovatelsky Institut Burovoi Tekhniki
Wallace Ronald S.
LandOfFree
Downhole sectional screw motor, mounting fixture thereof and met does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Downhole sectional screw motor, mounting fixture thereof and met, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downhole sectional screw motor, mounting fixture thereof and met will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-15729