Azeri-Chirag-Gunashli basin is a large complex of oil fields in the Azerbaijan sector of Caspian Sea. Hydrocarbon deposits in ACG are mostly located in Sandstone reservoir thus formation sand invasion into the well encountered throughout the world at this type of the formation, is common issues experienced in the field. A-09Z oil producer well finished with open hole screen completion had screen failure issue which resulted large amount of sand filling up the wellbore. The operator requested to clean the sand out of the well along horizontal section and isolate the existing production zone by setting the bridge plug to further perforate an interval above.
This paper describes the use of an integrated sand cleanout system to remove the formation sands out of this challenge well. The well was drilled to near horizontal with a large completion size and long tangential section around 60°. A hydraulically actuated, switchable circulation sub was used with a real time downhole measurement system. While running into the well, forward jets of the sub help break down debris. While pulling out of the well, the tool is switched to a low resistance, backward jetting mode, which sweeps debris more efficiently using higher flow rates. The real time downhole measurement with a robust conductor inside CT is used to verify the switchable circulation sub to be operated correctly. A sand monitor was used in the surface return line to continuously monitor the returned sand flux. The integrated cleanout system helps reduce the overall operation costs by making the job more efficient in terms of equipment usage and operation time.
