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.
Pertamina EP with North Kedung Tuban structure is located in East Java Indonesia. The drilling target is to produce gas from "Kujung" carbonate formation. The characteristic of this carbonate are vugular rock which caused total loss circulation, contain high concentration H2S and 20% CO2. Conventional curing loss methods such pump Lost Circulation Material (LCM) with various type, carbonate cementing and blind drilling, were not the good option since after loss circulation occur, gas kick immediately come up. To encounter this situation, Floating Mud Cap Drilling (FMCD) technique with sandwich system was applied. This method used Rotating Control Device (RCD) as surface barrier and multiple treating line tied to the annulus casing valve to pump down sandwich. While blind drilling performed, water pumped down through drill string and sandwich system fluid pumped through annulus. Sandwich is a combination of water + kill mud + water and so on. Volume, Kill Mud Weight and time delay for pumping were obtained from previous well data and observations until effective parameters were obtained during blind drilling. Sandwich fluid purposed as hydro static barrier to overcome gas influx come up to surface during blind drilling. To help good hole cleaning, high viscosity mud pumped frequently through drill string. When TD reached, sandwich system continue applied until BHA pulled inside casing. To accommodate tripping inside casing, change of RCD rubber element and RIH completion string, Downhole Casing Valve is attached in previous casing as mechanical barrier. As a result, the well completed with no gas kick occur while blind drilling and completion string placed as purposed accordingly. Furthermore, good communication between all personnel involved are necessary. This paper contains the Lesson Learned of FMCD application which is effective and efficient proven in NKT-001 and NKT-001TW well, with the drilling time and cost of hole section 8-1/2" 80% lower than conventional methods.
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