Near-bit strong magnet activator with automatic protection function

Abstract

The invention discloses a near-bit strong magnet activating instrument with the automatic protection function. The instrument comprises an inner pipe, a strong magnet arranged at one end of the inner pipe, a first sleeve and a second sleeve; the first sleeve and the second sleeve are arranged at the outer side of the inner pipe by sleeving; a spring sleeves the inner pipe and is used for connecting the first sleeve and the second sleeve; the strong magnet is positioned in the second sleeve; the second sleeve can slide relative to the inner pipe. The instrument further comprises a handle for fixing the first sleeve and the inner pipe, a stopping rod for limiting the second sleeve to move, and a strip-shaped through hole formed in the second sleeve; the handle transversely passes through the first sleeve and the inner pipe; the stopping rod passes through the strip-shaped through hole and the inner pipe; the size of the strong magnet is matched with a bit slot of the near-bit to be activated; the second sleeve is extruded when the strong magnet enters the bit slot and then moves toward the first sleeve direction. With the adoption of the design, the instrument has the advantages that the strong magnet can be protected through the sleeve when not in use, and the sleeve can automatically retract to expose the strong magnet when in use, so that the strong magnet can be effectively protected.

Description

technical field [0001] The invention relates to the field of petroleum machinery, in particular to a near-drill strong magnet activator with an automatic protection function. Background technique [0002] In the directional drilling construction of oil, natural gas and coalbed methane, etc., the drilling trajectory is required to be drilled exactly according to the designed trajectory. Therefore, how to obtain accurate directional measurement data near the drill bit is the key factor for the success of directional well construction. With the development of current drilling technologies such as horizontal wells and branch wells, drilling operations need to obtain real-time information on formations and drilling tool positions in a timely manner, which has led to the rapid development of near-bit support and measurement, which can determine in real time Wellbore silicon base and formation lithology, so that the target hit situation can be determined in real time. [0003] Th...

AI Technical Summary

Problems solved by technology

[0004] There is a chip in the near-drill measuring instrument, which can only be activated by a strong magnet activator with a strong magnet. The position of the chip is correspondingly provided with a strip-shaped through hole for accommodating the strong magnet, but the strong magnet has strong adsorption properties due to its own , During use, a lot of iron filings tend to be adsorbed, which causes scratches on the near-bit measuring instrument during the activation of the chip with a strong magnet activator, shortening the service life of the near-drill measuring instrument

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