Controlled full flow pressure pulser for measurement while drilling (MWD) device

摘要

An apparatus, method, and system described for generating pressure pulses in drilling fluid utilizing a flow throttling device which includes a controllable pulser operating sequentially within a downhole assembly within a drill string of a drill pipe. The system includes drilling fluid, fluid flow, and fluid drilling pump which when combined creates fluid flow into a bore pipe annulus within the downhole assembly creating a base line bore pipe pressure wherein bore pipe pressure is sensed via a sensor and information is sent to a Digital Signal Processor (DSP) that interprets the information. The DSP also receives information from an annulus pressure sensor that senses drilling fluid pressure as it returns to the pump. The DSP recognizes pressure variation input from the annulus pressure sensor and bore pipe pressure sensor and detects pressure variation providing signals as data information to the DSP, determining required action to adjust pulser operation.

主权项

1. A system comprising:
a controllable pulser utilizing a pilot actuator assembly that operates sequentially and bi-directionally within a downhole assembly within a drill string of a drill pipe, that enhances operational efficiency in the removal of hydrocarbon deposits, said system comprising; a drilling fluid, fluid flow, and a fluid drilling pump which when combined creates fluid flow into a bore pipe annulus within said downhole assembly such that a base line bore pipe pressure is created wherein said bore pipe pressure is sensed via a sensor sensing a pressure increase when said pump is operating such that said sensor sends information to a Digital Signal Processor (DSP) that interprets said information and wherein said DSP also receives information from an annulus pressure sensor that senses drilling fluid (mud) pressure as it returns to said pump in an annular outside portion of said drill pipe such said DSP recognizes pressure variation input obtained from said annulus pressure sensor and said bore pipe pressure sensor and detects pressure variation exhibited between pulsing pressures and a pump base line pressure thereby providing signals that are sent as data information to said DSP such that said DSP determines required action to properly adjust pulser operation settings for said pilot actuator assembly that includes channels designed so that only laminar flow and a water hammer effect occurs due to both said design and a decreased amount of time associated with the close of a main valve within said pilot actuator assembly, and subsequently sends information to a pulser motor controller that adjusts a stepper motor current draw, response time, acceleration, duration, and number of revolutions corresponding to any pre-programmed pulser settings wherein pulses within said pilot actuator assembly identically match the pulses of said pulser motor controller, as provided for by said DSP.