High Speed Acoustic Telemetry Network Enables Real-Time Along String Measurements, Greatly Reducing Drilling Risk

Abstract

Abstract A unique multi-node acoustic telemetry network capable of transmitting data at over 30 bits per second has been developed and successfully deployed in drilling applications. This paper details the lessons learned and value derived from early use of the acoustic telemetry network while drilling medium radius build sections of multiple horizontal wells. Particular focus is given to discussion of overall network reliability, ease of well-site implementation and delivery of pressure data from multiple along-string measurement locations with or without fluid circulation. Low latency, high-speed, real-time transmission of pressure data (from near the bit and other key locations along the borehole) allows highly accurate, potentially automated management of annular pressure to avoid unintentional formation fracture or fluid influx during drilling and non-drilling activities. This data can also be utilized to understand hole cleaning effectiveness in different sections of a well, allowing focused corrective action to be taken at the first sign of cuttings build-up, potentially avoiding costly stuck pipe incidents. In addition, continuous data transmission without the need for fluid circulation enables significant risk reduction when addressing well control incidents. Highly reliable tools placed up to 2,500 meters apart establish the acoustic telemetry network within existing drill strings and in conjunction with all bottom hole assembly components. It is virtually transparent to all rig operations and, as a result, significantly decreases the implementation time and cost when compared to along string measurement solutions delivered by wired drill string technology. This is the first publication of information from such field deployments and the first display of multi-node pressure data delivered via acoustic telemetry while drilling.