Apparatus and Method for Drilling Fluid Telemetry

摘要

A drilling fluid telemetry pulser comprises a housing disposed in a drill string in a wellbore, wherein the drill string has a drilling fluid flowing therein. At least one vent valve is disposed in the housing wherein the at least one vent valve is actuatable to vent a portion of the drilling fluid from an interior of the drill string to an exterior of the drill string to generate a negative pressure pulse in the drilling fluid in the drill string. A hydraulic system provides hydraulic power to actuate the at least one vent valve. A downhole controller comprises a processor and a memory in data communication with the processor wherein the memory contains programmed instructions to control the actuation of the at least one vent valve.

主权项

1. A drilling fluid telemetry pulser comprising:
a housing disposed in a drill string in a wellbore, the drill string having a drilling fluid flowing therein; at least one vent valve disposed in the housing wherein the at least one vent valve is actuatable to vent a portion of the drilling fluid from an interior of the drill string to an exterior of the drill string to generate a negative pressure pulse in the drilling fluid flowing in the drill string; a hydraulic system to provide hydraulic power to actuate the at least one vent valve; and a downhole controller comprising a processor and a memory in data communication with the processor wherein the memory contains programmed instructions to control the actuation of the at least one vent valve.