LIGHT WORKOVER EVALUATION YEAR 2001 - 2002 IN “T” FIELD TOTAL INDONESIE

• Main Author: SUGIARTO, TOMI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/53986
• Institution: Institut Teknologi Bandung

“T” field of Total E&P Indonésie was discovered in 1974 and put on production in 1975. Production peak was reached in March1977 with oil rate production around 197.000 bopd. “T” field, which consist of multilayered reservoir, particularly complex field due to its location at the edge of Mahakam river delta among swampy island. Most of the oil reserves are located in the main zone reservoirs between 1500 – 2700 meters. Right now, the remaining oil from reservoir is harder to be produced. It is simply because the field has been water flooded and the pressure is depleted as function of cumulative production and the fluid was produced from reservoir continuously. Many efforts have been done to solve this problem; one of them is light workover. Light workover (LWO) is any job to increase oil/gas production, which aim to modify or remedy the existing completion without pulling out or replacing it led to cost saving. In “T”, light workover consist of perforation job to make additional/change perforation interval, isolation of unproductive or water producer zones, and sand control. The successful of LWO jobs could be seen by an improvement oil/gas production rate after the jobs completed. It depends on many factors such as reserves, reservoir pressure, rock properties, and water oil contact or gas oil contact movement during the live of the field as fluid produce from reservoir. Technical factor when LWO jobs performed (perforation job and squeeze cementing job) also play important role in the successful of LWO. All that factors have to be analyzed to increases success ratio of LWO jobs in “T” field. As a result LWO Jobs in “T” field give an additional oil and gas recovery with a low operation cost and hopefully operating cost could be minimized while LWO gain increase. Detailed studies allow a better understanding of the reservoir behavior and thus highly efficient production impairment.