A depleted reservoir in the Tapian Timur field in South Kalimantan, Indonesia, is located at 1,400-mTVD with a 400-psi formation pressure. Drilling through it presents potential threats to operations, including lost circulation during drilling and cementing and borehole instability. Two wells previously drilled and completed in the area suffered long NPT due to stuck pipe and bad cement bond quality. Even though the field has been explored and developed for 43 years, a thorough study of the reservoir characteristics was never done. Improper knowledge of a reservoir like this one cause’s unnecessary lost time during drilling and poor zonal isolation of the target zone, can potentially jeopardize the economic feasibility of a project. For this reservoir, a geomechanical study was applied, and a mechanical earth model (MEM) was built. The model utilized multidisciplinary data across the field (drilling and logging data, core, pressure history) to evaluate wellbore stability and improve drilling practices. The MEM study provided key recommendations for the drilling process and cementing operation. Decisions made based on the study include changes in casing point, mud-weight optimization, and utilization of high-performance lightweight slurry with fiber. A subsequent well drilled in the area applying the recommendation from the study was drilled and completed faster. Cement bond logs from the section also indicated excellent zonal isolation across the reservoir. The recommendations from the study are currently integrated into the standard operation procedures.
Pertamina EP is an Indonesian national oil company which subsidiaries of PT Pertamina (Persero). For nearly 60 years, the Pertamina EP drilling area has been located onshore. In September 2017, Pertamina EP successfully conducted a Poleng N-2 well as the first drilling operation in an offshore area. Originally wells candidate's Poleng N-2, proposed in early 2017 with the target of drilling operations can be carried out on TW-3 in 2017. However, considering the acceleration of production, utilities offshore rig availability and cost efficiencies, accelerated drilling operations into TW-2 in 2017. it begins with the efforts to accelerate drilling AFE approval Poleng N-2 of SKK Migas on June 15, 2017. Short preparation was conducted with the support of SKK Migas and synergy of PHE WMO and PEP as a form of Pertamina Incorporated. Synergy is done in the form Farm in contract, Material Transfer Agreement and the exchange of information and expertise of each subsidiary, as well as support for QA / QC of internal WMO competent and experienced in drilling operations using Ensco Rig 67. So in the end, in the span of about three months, can be resolved about contract services and materials, including the preparation of internal HR by chance exposure PEP Drilling wells to WMO. Poleng field located in East Java province started operated by Pertamina EP in 2013. The drilling program Poleng N-2 of the Platform CW as the first drilling operation PEP from this field is expected to increase the production of limestone reservoir targets Kujung. As for the design of drilling a sidetrack well from the well parent CW-02H, at a depth of 5,000 ft MD ± which has a horizontal well trajectory is quite challenging on the route hole the size of 6-1 / 8 ″in length ± 2500 ft. The well completion technology also comes with Inflow Control Device (ICD) and Swell Packer on 4-1 / 2 ″Liner as part of the Lower Completion. In the end the Poleng N-2 well drilling operation can be completed in November 2017, with the status: Zero incident / accident, cost about 75% of the approved budget, the percentage of Non Productive Time is less than 5% and Initial production reached 783 BOPD above target of 700 BOPD so that production acceleration can be realized with a good economic level.
One of the efforts achieve Key Performance Indicator is to realize efficient organizational performance. Optimizing rig movement management is needed in PT. Pertamina Hulu Indonesia Sangasanga Field by reducing the duration of moving between wells and ensuring that the Rig cycle time kept to minimum. In real condition, all equipment in rig unit is still arranged on its own Skid with a large number of transport loads and in the activity of moving Rig/Hoist equipment between wells, all equipment transported is moved and rearranged at the next well location by using Winch Truck, Truck Crane, Flatbed truck and Crane. Moving activities with Winch Trucks and Truck Cranes accompanied by lifting activities have a high risk with 14 loading loads per moving rig. With far distance between sub working area and various obstacles such as river, bridge load limit, land and river transportation types resulting in long rig moving time. In 2019, to the second semester 2020 the loss when moving rigs reached USD 1,483 Million. The limited number of lifting and transporting equipment, the number of equipment and the loading-unloading process are the dominant cause for long moving rig time. To solve this problem, we modify the rig equipment into an On Trailer with the aim to arrange all Rig operational support equipment on the trailer both during operation and moving, and to reduce the number of loads, rig moving time and the risk of lifting. On Trailer is equipped with Handrail & walkway, sets of manual jacks, and trailer and prime mover connection including pneumatic line system. After the implementation of On Trailer, the frequency of loading, unloading and setting work drops to 9 times lower so the potential for tool damage decreases, moving rig time managed to decrease to 9.6 hours thus decrease rig personnel workload. By using On Trailer, it successfully reached cost efficiency of USD 1,354/well, the risk of work accidents due to lifting & rigging activities minimized to 9 times and reduce the CO2 emission is 2,487 Gj/year due to decrease of fossil fuel consumption.
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