REUSE OF DRILLING MUD IN 2021 HEAVY OIL DRILLING CAMPAIGN CASE STUDY: DRILLING OPERATION AT RIG “A” IN THE DURI FIELD OF PT. SCM

• Main Author: Setiawan, Nurmanthias
• Format: Theses
• Language: Indonesia
• Subjects: Manajemen umum
• Online Access: https://digilib.itb.ac.id/gdl/view/66768
• Institution: Institut Teknologi Bandung

PT. SCM (company name disguised) is an oil company and, as an operator in the Rokan Block, had an agreement with GOI to be able to carry out drilling 161 wells to maintain Rokan oil production until the end of the PSC period and will continue drilling activities after being taken over by the State Oil Company in August 2021. The average volume of drilling mud created for each well in the HO area is estimated to require approximately 1,200 bbl. However, Drill Mud will be disposed of entirely after being used in the disposal pit and becomes waste. During drilling activities, the disposal-pit several times experienced an almost full disposal pit condition which caused the drilling operation to stop. This causes the cost of making drilling mud remains expensive and the waste treatment process will also remain high. Even though the discarded drilling mud can still be used for new wells with a slight adjustment in the mud material composition. There are at least 9 identified contributing factors in the conceptual framework to a full disposal pit scenario that can cause the drilling operation to stop as follows : Aggressive drilling campaign, Drilling programs dictate to dump mud to build unweighted mud for next section, Limited capacity of CMTF, Not enough vacuum truck that deliver the disposal from drilling rig to CMTF, Weather Condition, Excessive cement volume during cementing casing, Well control event / flow from well, Loss circulation event and Environmental impact. Using Current Reality Tree (CRT) analysis and based on observations during drilling operations, and interviews with the parties involved. Six main root causes were identified which three of them (Muddy location, Drilling practice in hard formation, and Rig moving to new location need to empty mud tank) were chosen to be evaluated because they are the main contributors to business problems. The Drilling Program in the 2021 Heavy Oil drilling campaign is similar for each well, which has three sections of holes and has a mud program with the same properties. Generative alternative and solution selection were carried out in the Forum Group Discussion (FGD), total of 8 alternatives has been identified and Kepner – Tregoe (KT) decision analysis is used to evaluate the best alternative that is safe, cheaper and meets the standards of PT. SCM. The alternative #2 on root cause #3, which is to use a spare tank to contain used mud from completing well to be used again in the new well pad / location are selected to be the best alternative which met with the Must attributes (No Safety and Well Control issue) and contributes to the highest volume of disposal pit reduction, since there are 200 barrels of mud that can be used again instead of become waste also has zero additional cost with high applicability to be done each well. The project was implemented in 11 wells between February and April 2021. All well completed were drilled safely with no disruption and handed over with no full disposal pit experience,1900 barrels reuse mud volume used in new well by utilized spare tanks. The implementation of this project provides benefits for PT. SCM, especially the D&C Operations team, safely processed execution and saved mud well drill cost at least $40,186.