Downhole continuous wave mud pulse generator

Abstract

The invention relates to a downhole continuous wave mud pulse generator which comprises a continuous wave pulse generating assembly and a driving assembly for driving the continuous wave pulse generating assembly to work. The continuous wave pulse generating assembly comprises a shell, and a stator and a rotor which are sequentially arranged inside the shell from top to bottom; the rotor can rotate axially around the axial direction of the shell; mud overflowing holes are arranged in the stator and the rotor along the axial direction of the shell; an end cap is arranged at the upper end of the shell; a through hole for the mud to run through is arranged in the end cap; the mud overflowing hole in the stator is communicated with the through hole in the end cap; the overflowing hole in the rotor is communicated with an opening at the side face of the shell; and the driving assembly drives the rotor to rotate. The downhole continuous wave mud pulse generator provided by the invention is reliable to work and can be used for generating mud pulse signals in a wireless LWD (Logging While Drilling) system.

Description

technical field [0001] The invention belongs to the field of petroleum measurement while drilling, and relates to a downhole mud pulse generator, in particular to a downhole continuous wave mud pulse generator which transmits bottom-hole measurement signals through mud waves. Background technique [0002] In the field of oil measurement while drilling, the measured drilling parameters and formation parameters are used to adjust the drill bit trajectory in time to make it drill in the direction of the target layer, and the formation parameters obtained by logging while drilling are closest to the original state of the formation, which is more conducive to complex formations. oil and gas evaluation. The logging-while-drilling tool is placed in the non-magnetic drill collar. In addition to measuring directional parameters (well deviation, azimuth, tool face angle), gamma, resistivity, sound velocity, neutron porosity, density and other conventional logging, it can also Measure...

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Problems solved by technology

[0004] The continuous wave mud pulse generator is the core part of the logging while drilling system, but there are various problems in the existing continuous wave mud pulse generator, such as the electrical virtual connection caused by the pinhole connection method in the downhole vibration environment, and the balance of the oil pocket. Insufficient pressure caused by corrosion or oil leakage can not balance the downhole pressure, too large well deviation or too fast drilling speed will cause the instrument to disconnect and cause no signal, the instrument cannot be salvaged, and the instrument is scrapped when the drill is stuck, etc.

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