PT Pertamina Hulu Rokan Tests Libo Well

PT Pertamina Hulu Rokan (PHR) has completed the first production test of the Libo SE #86 well in Siak Regency, Riau Province, achieving an initial production rate of up to 1,274 barrels of oil per day (BOPD). The result marks a development milestone for the Rokan Block and supports Indonesia’s national oil production targets.

Zero Water Cut in Early Production
A notable outcome of the production test is a reported 0% water cut, indicating that the produced hydrocarbons consist entirely of oil without associated formation water. In mature basins such as Rokan, where many reservoirs experience increasing water production over time, zero water cut at initial testing can indicate favorable reservoir conditions and effective well placement.

Reduced water production lowers lifting and separation costs and minimizes the need for water handling infrastructure, contributing to improved operational efficiency.

Targeting the Top Menggala Formation
The well targets the Top Menggala layer at a depth of approximately 5,680 feet. The reservoir exhibits permeability values of up to 2.2 Darcy, suggesting high fluid transmissibility and favorable flow characteristics.

To optimize recovery, PHR implemented selective perforation, focusing on reservoir intervals with the highest productivity potential. By perforating targeted zones rather than the full reservoir thickness, the operator aims to maximize oil flow while minimizing unwanted water or gas production.

Artificial Lift and Gas Management
The well is equipped with an electric submersible pump (ESP) optimized for low-rate operation to match the reservoir’s optimal production profile. Proper ESP sizing is critical to maintaining stable bottom-hole pressure and avoiding premature reservoir drawdown.

To manage associated gas, PHR installed an Advanced Gas Handler (AGH) within the subsurface pump system and a gas separator at the surface. This combination stabilizes fluid flow under gassy conditions and supports consistent oil production performance.

Continued Development in the Libo SE Area
Following the successful test of Libo SE #86, PHR has commenced drilling of the Libo SE #88 well on the same wellpad. In addition, four infill wells are planned to further develop the Libo SE area and maximize hydrocarbon recovery.

The drilling campaign involves coordinated efforts across subsurface development planning, drilling and well intervention, production technology, operations and land management teams.

The initial results from Libo SE #86 demonstrate continued production potential within the Rokan Block and contribute to Indonesia’s broader objective of sustaining and increasing domestic oil output.