Measurement-while-drilling mud pulser and method for controlling same

A mud pulse and measurement-while-drilling technology, which is applied in the directions of measurement, earthwork drilling, borehole/well components, etc., and can solve the problems of normal operation and reliability of interference brushes

Inactive Publication Date: 2012-11-14
SONDEX WIRELINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although the Hall effect sensors could alternatively be avoided by using a brushed DC motor, doing so introduces different reliability issues because the high pressure oil-filled environment in which a brushed DC motor operates can interfere with the normal operation and reliability of the brushes

Method used

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  • Measurement-while-drilling mud pulser and method for controlling same
  • Measurement-while-drilling mud pulser and method for controlling same
  • Measurement-while-drilling mud pulser and method for controlling same

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Embodiment Construction

[0056] The use of directional terms such as "top", "bottom", "up", "down", "vertical" and "horizontal" in the following descriptions is for relative reference purposes only and is not intended to imply any Any restrictions on placement of or how any equipment may be installed into the module or with respect to the environment.

[0057] figure 1 A drill pipe bottom hole assembly (hereinafter simply referred to as "drill pipe") 19 is shown in which an exemplary mud pulser 10 is disposed. The mud pulser 10 comprises a main housing 1 retrievably located on fins 21 provided in a drill pipe 19 . The connection to the drill pipe 19 may also include a mule shoe arrangement to ensure rotational alignment of the orientation sensor housed in the mud pulser 10 . The main casing 1 is smaller in diameter than the drill pipe 19 to form an annulus 20 through which drilling mud can flow. An orifice collar 18 is provided in the drill pipe 19 below the fins 21 for forming an orifice or restri...

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Abstract

A measurement-while-drilling mud pulser and a method for controlling a measurement-while-drilling mud pulser. The mud pulser includes a brushless DC motor that hydraulically controls a main restrictor valve that the mud pulser uses to generate mud pulses. Back EMF signals generated in the stator windings of the brushless DC motor are monitored and are used as the basis for commutating the brushless DC motor. The phase transitions in the back EMF signals can be used in governing stator energizations of the brushless DC motor to thereby govern its rotation.. Relying on back EMF signals for commutation allows commutation to be performed without Hall Effect or other kinds of sensors, which can thereby reduce cost of the mud pulser and further increase reliability of the mud pulser by decreasing the number of high pressure sealings needed due to wires from Hall effect sensors, which are prone to develop leaks.

Description

technical field [0001] The present disclosure is directed to a measurement-while-drilling mud pulser and methods for controlling the same. More specifically, the present disclosure is directed to a measurement-while-drilling mud pulse generator that utilizes a sensorless, brushless DC motor to actuate a valve that generates a mud pulse. Instead of relying on sensors to determine rotor (and thus valve) position in order to obtain a mud pulse, the back EMF signal generated by the motor during operation is used to determine how and when to commutate the motor to generate the desired mud pulse. Background technique [0002] The importance of directional drilling in the petroleum industry continues to increase. [0003] Drilling of directional oil wells requires information about the orientation of the drill bit and data about the type of geological formation that is then drilled that is continuously transmitted to the surface so that corrections can be made to the orientation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/18
CPCE21B47/187E21B47/24
Inventor W·斯图尔特-布鲁格
Owner SONDEX WIRELINE
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