This paper presents a case study of the successful lower completion deployment of 13 swellable packers and Autonomous Inflow Control Valves (AICVs) into a 2227 ft open hole using a light workover rig in ADNOC Onshore (AON).

The objective of the well was to reduce the well's high Gas to Oil Ratio (GOR) and increase production efficiency and profitability. The main concern as Drilling & Completion team was to recover the single oil producer completion and run it with lower completion safely to the Target Depth (TD) and meet the Asset team objective and requirements.

The workover rig of 750 HP can reach up to 12,000’ target depth and the maximum overpull is 210 klbs where the planned target depth is 12,127’ MD/ 8922’ TVD. A pilot study was done on this well since the production team observed an increase in the GOR where the maximum value reached 2800 scf/bbl from 2016 to 2022.

Despite the challenges presented by the light workover rig capacity limitations, deployment of 2227 ft lower completion with 13 swell packers in open hole with assurance of proper isolation, a dedicated engineering study, simulations and risk assessment were concluded during the planning phase focusing on these challenges and set the proper engineering solution through a Torque and Drag simulation and checking the feasibility of deploying lower completion using the 750 HP light workover rig. In addition, a proper hole cleaning was planned with the combined trip of open hole drift and scrapper. Furthermore, for wellbore segmentation isolation, two runs of mechanical caliper logs were conducted to guarantee optimal placement of swell packers and strive for proper isolation of each segment, which eventually supported the successful completion of the well as per plan. The study provides insights into the design, execution, and monitoring of maintenance work for workover wells that aim to retain their production rates.

One of the major challenges of the well was the limitations of the rig capacity which will be highlighted in the study along with the methods used to address these limitations. Also, the use of AICVs, 13 swell packer deployment, equipment selection, real-time monitoring, expertise, pre-planning, torque and drag performance, design modelling, and simulations during the planning phase are some of the steps taken to eventually execute a flawless completion. A proper well cleanout and dedicated drift run were among some of the things carried out to make the deployment of the lower completion successful. The eventual results showed that the use of these techniques not only helped reduced the well's high GOR and thereby increased production efficiency and profitability but also was the main reason we were able to successfully get the lower completion to target depth. It is significant to highlight that one of the lightest WO rigs in the AON field successfully completed the well as Workover well.

You can access this article if you purchase or spend a download.