DEPLOYMENT OF DOWNHOLE SEISMIC SENSORS FOR MICROFRACTURE DETECTION

摘要

Methods and equipment are described for placement of an array of seismic sensor sets along a horizontal section of wellbore for monitoring microseismic activity during and after hydro-fracturing. A perforated wellbore liner is positioned in the horizontal wellbore production section with sonic transmission enhancement devices such as longitudinal blade centralizers for acoustically coupling seismic sensing devices to the production formation. Internally of the perforated liner, a coiled tube is placed having an array of signal cable connected seismic sensor sets. The seismic sensor sets are linked to the coiled tube wall by sonic transmission enhancement devices and the tube wall linked by acoustic transmission enhancement devices to the perforated liner.