An eccentric wheel type anti-friction and drag reduction device
A friction and drag reduction, eccentric wheel technology, used in drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems of difficult feeding of the drill string and large friction resistance of the drill string, so as to extend the drilling length and reduce friction. The effect of less resistance and wearing parts
Active Publication Date: 2018-08-21
VERTECHS OIL & GAS TECH CO LTD
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Problems solved by technology
[0004] The invention provides an eccentric wheel type anti-friction and resistance device to solve the technical problems that the drill string friction resistance in the horizontal section of the extended-reach well and the horizontal well is large and the drill string is difficult to feed
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0040] For the sectional structural diagram of the drag reducing wheel assembly in the eccentric wheel type friction reducing and drag reducing device of the present invention, see figure 1, the drag reducing wheel assembly 02 includes a roller cover 021, a roller 022, a plurality of anti-wear teeth 023, and an oil storage bag 025. The roller cover 021 is provided with an inner cavity, the roller cover 021 is fixed on the cylinder 01, and the roller 022 is arranged on the roller In the inner cavity of the sleeve 021, the upper part of the roller 022 is sealed and connected with the roller sleeve 021 through a sealing structure. The through hole is provided with a sealing plug 029; the lower part of the roller 022 is rollingly connected with the roller sleeve 021 through a rolling connection structure, and the lower part of the roller 022 is also provide...
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The invention provides an eccentric wheel type antifriction and resistance-reducing device. At least one row of resistance-reducing wheel assemblies are arranged on a cylinder body; each row of resistance-reducing wheel assemblies at least comprise three resistance-reducing wheel assemblies; an included angle is formed between a section of each resistance-reducing wheel assembly and the axis of the cylinder body; the resistance-reducing wheel assemblies are protruded out of the outer surface of the cylinder body and are cylindrical; an axis of each resistance-reducing wheel assembly and an axis of the cylinder body are two non-uniplanar lines; projections of multiple resistance-reducing wheel assemblies on a section perpendicular to the axis of the cylinder body form a projection section of the resistance-reducing wheel assemblies; projections of every two adjacent resistance-reducing wheel assemblies are in rotational symmetry to the axis of the cylinder body; an angle formed between the axis of each resistance-reducing wheel assembly and the axis of the cylinder body is an acute angle and is consistent relative to the inclined direction of the cylinder body axis; in the feeding-in process of a drilling column, the resistance-reducing wheel assemblies are in contact with a well wall, so that the resistance-reducing wheel assemblies rotate, and sliding friction between the well wall and the drilling column is converted into rolling friction between the well wall and the resistance-reducing wheel assemblies; the drilling column is axially fed in and circumferentially rotates to drive the resistance-reducing wheel assemblies to rotate, and further friction resistance is reduced.
Description
technical field [0001] The invention relates to the technical field of drilling engineering in the petroleum and natural gas industry, in particular to an eccentric wheel type friction and drag reduction device. Background technique [0002] In the oil and gas industry, horizontal wells and extended-reach wells have obvious advantages in the development and construction of oil and gas wells, and thus derived multilateral well technology. Horizontal wells have the advantages of increasing oil drainage area, improving oil well productivity, and reducing unit technical cost. However, in the horizontal well section, the drill string lies horizontally on the well wall, and the weight of the drill string produces a great positive pressure on the well wall, resulting in a great frictional resistance between the drill string and the well wall, which seriously hinders the drilling of the drill string. Feed and bit pressure. The longer the length of the horizontal section, the great...
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IPC IPC(8): E21B17/00
CPCE21B17/00
Inventor 何清山
Owner VERTECHS OIL & GAS TECH CO LTD