Saudi Aramco drilling strategy has shifted from vertical to horizontal due to proven advantages in optimizing production and cost. Evaluation of horizontal wells presents new challenges for the industry, especially with increasing water production. Therefore, it is important to determine the flow profile, water entry points and productivity index for remedial action, such as water shut off or selective stimulation.
A new generation of production logging tools (PLTs) was introduced and utilized on some horizontal wet producers located in Saudi Arabia. The new PLT is comprised of arrays of spinners and sensors to log the entire cross section to describe precisely the horizontal flow regime. This PLT provides measurements of the downhole production and phases.
A comprehensive evaluation was conducted of this type of PLT using different acquisition methodology and deployment methods to understand the best logging procedure. Therefore, one set of the spinners and sensors was attempted into two wells while two sets were attempted in the other two wells. Also, the PLT was deployed using two methods, which are coiled tubing (CT) and wireline tractor. Consequently, a group of lessons learned was gained, and the best logging procedure was established. The operation and interpretation results indicated that the production profiles obtained using this intelligent tool are reliable and accurate.
This paper describes cases including planning, deployment, data acquisition, detailed analysis, results and lessons learned. A quality control of the data is also reviewed considering the importance of real time acquisition and validation of the information for future use in reservoir management or well intervention.