VACS services clean up SAGD wellbore, saves ESP, incurs zero NPT
An operator in Fort McMurray, Alberta, deploys steam assisted gravity drainage (SAGD) and electric submersible pump (ESP) technology to produce their field. Due to sand production in some of the wellbores, the ESP pumps’ life expectancy is reduced. In this case, the ESP pump, installed in a high-temperature, shallow and total vertical depth (TVD) well, ceased to function after pulling sand through. Previous attempted bailer trips to recover these sands in similar wellbores in the area proved to be unsuccessful and did not remove adequate sand volumes in an efficient way.
In search of successful services to properly clean the wellbore, Baker Hughes, a GE company (BHGE), was requested to run the vectored annular cleaning service (VACS™). The BHGE operations team designed a 2 ⅞-in. VACS wellbore cleanup bottomhole assembly (BHA) including, float subs, 3 ½-in. tubing, junk catchers, and a variety of shoes to accommodate the wellbore conditions and requirements. The BHA was small enough to fit comfortably alongside the guide string, did not require high pump rates to achieve effective suction, and had a large enough shoe inside diameter (ID) and junk catcher area to catch any large debris.
The BHA was deployed with a service rig, slanted to 35° at surface. The VACSPredictor™ prejob planning software aided in designing the most applicable BHA set-up to ensure suction, maintain wellbore control, and optimum sand recovery. Approaching the top of the trouble area, pump rates and pressures were established and the clean-out operations initiated. Since the VACS technology was able to clear the wellbore ahead of the string, the end of the trouble area was reached without much need to reciprocate the workstring.
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