Wireline Conveyed Robotic Intervention for Obstruction Cleaning and Sampling in Horizontal Wells Completed with Open Hole-Worldwide First Job Experience

摘要

The objective of this paper is to share the experience of first worldwide job where wireline conveyed robotic cleaning tool was utilized to clean the obstruction in open hole section of oil well while collecting of uncontaminated sample of blockage material.Wireline conveyed,lightweight,robotic intervention tools were used in one of fields in Saudi Arabia to collect uncontaminated sample of obstructive material for future chemical treatment and to remove the bridge in Open Hole section of oil well,so Workover Rig or Coiled Tubing intervention can be avoided or significantly deferred.Operation was performed without killing the well and with no additional fluids pumped into well,reducing possible intrusion and skin build up.This technology was run first time in world practice to clear an obstruction in Open hole section.Severe planning was performed prior to technology introduction,including possible solutions comparisons and risk assessment.Robotic intervention was proven not only technically superior,but yielded large economic benefits compared to traditional descaling and sampling methods.It involved less personnel and produced much less CO2 footprint as well.Sample retrieved during the operation was analysed in laboratory and with high degree of certainty can be attributed as localized formation collapse.Same was confirmed by limited length of blockage that was successfully removed.This represented additional mechanism of wellbore restriction in the field.The experience from first worldwide operation,the methods and tools descriptions,process,lessons learned,recommendations and way forward will be presented in this work and should be of great interest for wide group of practicing engineers.