Oil seal structure of downhole power tools

A power tool and oil sealing technology, applied in drilling equipment, drilling equipment and methods, earthwork drilling, etc., can solve problems such as damage to the sealing structure of the lubricating oil cavity, high solid content of drilling fluid, and high bottom hole temperature, etc. Achieve improved reliability and service life, continuous supply and sealing requirements

CN103851324BActive Publication Date: 2016-08-03BC P INC CHINA NAT PETROLEUM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-08-03

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Abstract

The invention discloses an oil seal structure of an underground power tool, and belongs to the technical field of oil and gas drilling. The oil seal structure of the underground power tool comprises the underground power tool and a seal piston, wherein the underground power tool comprises an oil cavity fixing shell and a main shaft; the oil cavity fixing shell is provided with a hollow oil cavity; the main shaft is fixedly installed in the hollow oil cavity; the seal piston is installed in the hollow oil cavity, and can slide in the hollow oil cavity along the main shaft; the first end of the hollow oil cavity is communicated with the external environment; a sealed lubricating oil cavity is formed between the seal piston and the second end of the hollow oil cavity. According to the oil seal structure, the seal piston slides under the action of pressure difference between the external environment on the first end of the hollow oil cavity and the lubricating oil cavity, so that the pressure of the external environment and the pressure in the lubricating oil cavity reach dynamic balance; therefore, the persistent supply and seal requirements of lubricating oil in the lubricating oil cavity are realized, and the reliability and the service life of the oil seal structure of the underground power tool provided by the invention are improved / prolonged, so that the underground power tool is effectively protected.
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Description

Technical field

[0001] The invention relates to the technical field of oil and natural gas drilling, in particular to an oil seal structure of a downhole power tool. Background technique

[0002] Downhole power tools, drill bits, drill collars, etc. form the bottom hole assembly, which is located at the bottom of the entire drill string and directly provides rock breaking power for the drill bit, which can effectively increase the mechanical drilling speed and realize the directional deflection function. And with the development of oil and gas exploration and development, more and more downhole power tools are used in deep and ultra-deep well drilling operations.

[0003] During drilling operations, downhole power tools are affected by various solid media and corrosive substances in the drilling fluid, and their life will be reduced. Therefore, the existing downhole power tools are often provided with an oil cavity, and the external drilling fluid environment is separated by an oi...

Examples

Embodiment Construction

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] Please refer to figure 1 The present invention provides an oil sealing structure for a downhole power tool, which includes the downhole power tool and a sealing piston 9 installed in the downhole power tool.

[0020] The downhole power tool includes an oil cavity fixed shell 1, a main shaft 3 installed in the oil cavity fixed shell 1, and an oil cavity inner part 5 installed in the oil cavity fixed shell 1. Among them, the parts 5 in the oil chamber are installed on the main shaft 3, and the parts 5 in the oil chamber may be bearings, rotors, coils, disc springs and other parts suitable for an oil lubrication environment. The main shaft 3 is a hollow shaft.

[0021] A hollow oil cavity 11 is provided in the oil cavity fixed shell 1, and t...