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Mahakam block is a concession area of oil and gas fields currently operated by Pertamina Hulu Mahakam. This block is located across the Mahakam offshore and delta in East Kalimantan. Mahakam block has been producing oil and gas since more than 40 years ago and is categorized as brownfield due to its marginal reserves. Coming from that situation, new wells are required to sustain field production. With limited available slots on existing platform, drilling thru re-entry wells is introduced. However, conventional re-entry drilling operation is still not satisfactory to meet the economical cut-off for the remaining marginal reserve. A comprehensive re-entry well drilling strategy is continuously developed to optimize re-entry well drilling operation and significantly reduce the well cost. The strategy involves various optimizations from all drilling aspects. The first phase of re-entry well drilling evolution aims to eliminate invisible lost time from conventional re-entry drilling operation, by implementing rigless Plug and Abandonment (P&A) of parent well, eliminating BHA trips for milling casing & rathole during sidetrack preparation, and performing direct logging thru sidetrack window with wireline for reservoir data acquisition. After the first phase of re-entry well drilling evolution is established, the second phase of re-entry well drilling evolution is implemented to further reduce the well cost to meet the economic cut-off for the remaining marginal reserve, by focusing on optimization of drilling performance aspects, such as BHA optimization, fit to purpose bit selection, enhanced drilling parameter and fast connection. The result of comprehensive optimization of re-entry well drilling operation is very promising and shows a positive impact. At the beginning of re-entry well introduced in Mahakam, the well was completed within 32.3 days of well duration for 1 section drilling interval. The implementation of optimizations was performed in stages to assess the feedback thoroughly for better results thru the first phase and second phase of re-entry well drilling evolution, resulting in gradually reduction of well duration and also the well cost. The latest implementation in Peciko field where the well can be successfully completed within 7.2 days and becoming the fastest development well drilled in Offshore Mahakam area. The well cost is also significantly reduced by up to 60% compared to the first re-entry well performed with conventional method. The most important thing, all the initiatives have been executed in a safe manner without any major operation issues and successfully unlocked remaining marginal reserve to prolong the sustainability of Mahakam. The result of comprehensive optimization of re-entry well drilling operation significantly boosts the confidence for offshore field development, unlocking the way towards the Second Life of Mahakam. This strategy will become the new standard in drilling new development wells in Offshore Mahakam area to better adapt to the economic challenges. Furthermore, all the initiatives are also very feasible to be applied in other areas outside of Mahakam for the re-entry well campaign.
Mahakam block is a concession area of oil and gas fields currently operated by Pertamina Hulu Mahakam. This block is located across the Mahakam offshore and delta in East Kalimantan. Mahakam block has been producing oil and gas since more than 40 years ago and is categorized as brownfield due to its marginal reserves. Coming from that situation, new wells are required to sustain field production. With limited available slots on existing platform, drilling thru re-entry wells is introduced. However, conventional re-entry drilling operation is still not satisfactory to meet the economical cut-off for the remaining marginal reserve. A comprehensive re-entry well drilling strategy is continuously developed to optimize re-entry well drilling operation and significantly reduce the well cost. The strategy involves various optimizations from all drilling aspects. The first phase of re-entry well drilling evolution aims to eliminate invisible lost time from conventional re-entry drilling operation, by implementing rigless Plug and Abandonment (P&A) of parent well, eliminating BHA trips for milling casing & rathole during sidetrack preparation, and performing direct logging thru sidetrack window with wireline for reservoir data acquisition. After the first phase of re-entry well drilling evolution is established, the second phase of re-entry well drilling evolution is implemented to further reduce the well cost to meet the economic cut-off for the remaining marginal reserve, by focusing on optimization of drilling performance aspects, such as BHA optimization, fit to purpose bit selection, enhanced drilling parameter and fast connection. The result of comprehensive optimization of re-entry well drilling operation is very promising and shows a positive impact. At the beginning of re-entry well introduced in Mahakam, the well was completed within 32.3 days of well duration for 1 section drilling interval. The implementation of optimizations was performed in stages to assess the feedback thoroughly for better results thru the first phase and second phase of re-entry well drilling evolution, resulting in gradually reduction of well duration and also the well cost. The latest implementation in Peciko field where the well can be successfully completed within 7.2 days and becoming the fastest development well drilled in Offshore Mahakam area. The well cost is also significantly reduced by up to 60% compared to the first re-entry well performed with conventional method. The most important thing, all the initiatives have been executed in a safe manner without any major operation issues and successfully unlocked remaining marginal reserve to prolong the sustainability of Mahakam. The result of comprehensive optimization of re-entry well drilling operation significantly boosts the confidence for offshore field development, unlocking the way towards the Second Life of Mahakam. This strategy will become the new standard in drilling new development wells in Offshore Mahakam area to better adapt to the economic challenges. Furthermore, all the initiatives are also very feasible to be applied in other areas outside of Mahakam for the re-entry well campaign.
After successfully drilling and completing 40 wells with 5000 psi rated production trees in the swamp operation within a 5-year campaign the diverter deck on the Swamp Rig barge never posed a challenge until 6650 psi production tree had to be installed on two non-associated gas wells. The Field Development Plan (FDP) was approved in 2013 and it contained a 2-well (NAG-1A and NAG-2A) development plan for the target reservoirs with estimated recovery of 213 BCF of rich gas and 4.6 MMSTB of pool condensate at initial production rates of 35 MMSCFD and 1,380 BCPD each for both wells. Gas production from these wells will bulk flow to the NAG separator located at the Production Flow Station where the pool condensate will be separated from it. The rich gas will subsequently be transported to the gas plant onshore bypass for supply to the domestic market through the ELPS. NAG-1A and NAG-2A wells are part of the Non-Associated Gas (NAG) development and were completed as single string deviated gas producers with HRWP completions to meet target production rates and reserve recovery. After successfully drilling and completing the NAG-1A well, it was later discovered that the diverter deck of the rig was going to impact the 6650 psi production tree while moving the rig onto the NAG-2A well slot on the same jacket. This paper sets out to give an overview of the planning, risks assessment and execution for using a crane barge to successfully install two 6650 psi production trees on two NAG wells incidents free, after the drilling rig departed location due to the diverter deck limitation. Lessons learned and best practices were captured as well as the resultant cost savings from using the crane barge instead of the rig to install the production trees on the two NAG wells. The total number of days to complete the offline XMT installation using a crane barge was 5 days for both wells while working daylight hours only. This resulted in a cost savings of 154,200 USD per well.
Delta Mahakam, located in East Kalimantan has been known as one of the old oil and gas fields in Indonesia which has been developed since 1970. With massive production over more than 50 years, the field has entered the brownfield period. The reservoir pockets get more difficult and challenging to reach. The environment is factory-drilling with a fast operation (up to 200 m/h instantaneous on-bottom penetration rate, multiple offline activities, and fast connections practices) and is considered to be reaching the saturation level. The challenge now is to identify the opportunity for marginal but continuous performance improvement to lower the overall drilling operation cost. Specific to this Delta Mahakam brownfield, there are at least six (6) DD/MWD/LWD-related initiatives that were implemented to optimize the drilling operation: (1) Adaptive and Continuous development of drill bit design; (2) Robust metal-to-metal-based push-the-bit Rotary Steerable System (RSS) utilization to boost up ROP; (3) Downhole steerable motor with high torque performance power section to gain higher horsepower during drilling; (4) High-performance motorized RSS to improve performance in S-type high torque, interbedded high impact formation, and long reach wells; (5) Utilization of LWD tool with single co-located formation evaluation sensors to enhance safety, surface handling efficiency, and geo-stopping; (6) high-resolution real-time data for high-speed drilling and safe BHA pull out of hole (POOH). For the last 5 years, despite the more challenging oil/gas reservoir pockets to be targeted, the directional and logging while drilling performance in Delta Mahakam continuously increased. The drilling statistics show that 19.5% higher on-bottom ROP has been achieved by transitioning the BHA drive system from an elastomer-based to a metal-to-metal-based push-the-bit RSS system. For wells with a steerable motor application (high DLS requirement in wash-out prone zone), the high-torque performance motor helped boost up sliding ROP, improving the total drilling on-bottom ROP by 24%. For the wells with special challenges (S-type high torque, interbedded high impact formation, long reach), the high-performance motorized RSS has proven to achieve 39% higher on-bottom ROP, which potentially saved 175 hours of drilling time from 7 wells drilled compared to the traditional RSS-standalone approach. On the invisible lost time (ILT) reduction side, the utilization of an integrated single-collar LWD tool saved the surface handling time by an average of 34%, and TD determination by 43%. All those performance improvements are achieved without sacrificing the real-time data quality supported by the high-frequency mud telemetry technology which transmits the signal 200% faster than the average technology available in the industry.
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