THUMS (C-139) Well Rework Program at Island Chaffee

THUMS Long Beach Co. is proposed to rework existing producer well C-139, API #0423720913, located in the Wilmington Oil Field offshore near Island Chaffee, California. The rework involves plugging back the current completion, perforating a new production zone, running and gravel packing a 3-1/2 inch screen, and installing an electric submersible pump to return the well to production. This operation is subject to approval by the California Department of Conservation, Geologic Energy Management Division under Permit #7056195, which authorizes the modification and redevelopment of the well to enhance hydrocarbon recovery in the field. The project targets improved production efficiency through a targeted completion strategy without changing the well’s primary function as a producer. The contract is listed as a forecast by the California Department of Conservation, with the point of contact for technical inquiries being Salma Khatun, Associate Oil and Gas Engineer, reachable at the provided phone and email. Pradeep Thallapalle of CRC serves as the agent for coordination. The planned activities are confined to the existing wellbore and surrounding reservoir interval, with no indication of new drilling or surface facility expansion. The proposed work follows established regulatory protocols for offshore well interventions in California, with the permitting process managed through CalGEM and documented under the project identifier 2026060301 on the CEQAnet system. All operations are expected to comply with state environmental and safety standards applicable to oil and gas development in the Wilmington field.