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Collaborating Authors
Pressurized-mud-cap drilling (PMCD) and early kick detection (EKD) are two unconventional drilling techniques that have been used widely individually, mostly in relation to closed and pressurizable systems and to managed-pressure-drilling (MPD) applications. The techniques, however, are seldom used together as an integrated setup. This paper describes a synergized PMCD and EKD setup and the field deployment where it was used to drill a well successfully offshore Kalimantan, Indonesia, that had a high-pressure formation below a zone prone to severe circulation losses. Many drilling problems offshore Kalimantan involve lost-circulation problems and unintended influxes. Drilling conventionally through fractured and extremely vugular carbonate formations, which are prone to severe lost-circulation problems, can lead eventually to well-control situations.
Combining Pressurised Mud Cap Drilling (PMCD) and Early Kick Detection (EKD) Techniques for Fractured Formations Overlying a High Pressure Reservoir in Offshore Kalimantan
Benny, Benny (Weatherford) | Hidayat, Andri M. (Weatherford) | Karnugroho, Ardia (Weatherford) | Sosa, Julius (Weatherford) | Toralde, Julmar Shaun (Weatherford)
Abstract Pressurized Mud Cap Drilling (PMCD) and Early Kick Detection (EKD) are two unconventional drilling techniques that have been used widely individually, mostly in relation to closed and pressurizable systems and to Managed Pressure Drilling (MPD) applications. However, both techniques are seldom used together as an integrated setup. This paper describes a synergized PMCD and EKD setup and field deployment that was used to successfully drill a well in offshore Kalimantan, Indonesia that had a high pressure formation below a zone prone to severe circulation losses. The key components in the setup were a rotating control device (RCD) and a Coriolis mass flow meter. Using an RCD, the drilling system was converted from a conventional open-to-the-atmosphere to a closed-loop system that allows more precise diversion and accurate well flow monitoring, when used in conjunction with a Coriolis mass flow meter. Since it is a closed system, the comparison of the flow coming out of the well with the flow pumped into the well will provide advance information regarding any influx or outflux from the system. The system designed also takes into consideration the efficiency in switching between modes, that is, from conventional drilling to PMCD mode or to EKD mode and then, back to conventional mode. Possible improvements to the system and equipment are also discussed in the paper, as well as how the current system was utilized to successfully drill a well that previously involved multiple sidetracks when attempting to drill conventionally to target depth.
Abstract This paper describes the implementation of pressurized mud cap drilling (PMCD) technology, a variant of Managed Pressure Drilling (MPD), a successful technique frequently used on oil and gas fields in Kazakhstan. It also considers the planning phase, operational aspects, and results of drilling with the PMCD technique through challenging formations. PMCD technology with a rotating control device (RCD) is a form of blind drilling, where the drilling fluid and formation cuttings are not transported to the surface. It is a non-conventional drilling technique designed to maintain annular wellbore pressure to prevent total loss of circulation. A sacrificial fluid (SAC) is injected through the drill string and light annular fluid is pumped down from the annulus to maintain borehole fill and prevent annular gas migration. Wells in this field have encountered uncontrollable losses while drilling sections of the fractured carbonate. As a result, the application of PMCD technology to meet those challenges was an obvious choice in order to achieve target depth. Conventionally drilling of the 8-in. section resulted in fluid losses of more than 450 m. Consequently, passing through these challenging zones the rig crew switched from conventional drilling to PMCD. The wells were then successfully drilled using the PMCD method, without any issues or well-control incidents, and planned TD was attained. By enabling the client to reach TD, Weatherford PMCD equipment transformed a previously undrillable well into a potentially valuable asset. This operation demonstrated that PMCD can be a viable drilling technique for future wells in the field. PMCD technologies included reduced consumption of lost-circulation material (LCM) and reduced loss of mud to the formation, keeping the wells economically viable. The main objectives of these wells were to drill safely and efficiently to target depth (TD), to deliver the wells for production on schedule, reduce non-productive time (NPT), minimize the drilling risks and hazards, and optimize the drilling program.
- North America > United States > Montana > Sumatra Field (0.99)
- Asia > Kazakhstan > Mangystau Oblast > Precaspian Basin > Tengiz Field > Tengiz Formation (0.99)
- Asia > Kazakhstan > Mangystau Oblast > Precaspian Basin > Tengiz Field > Korolev Formation (0.99)
Abstract The objective carbonate interval in Parigi formation often experiences total loss circulation and migration of gas to surface after losses circulation experienced which hardly to be controlled with conventional technique. In depth preparation is highly required before penetrating this carbonate formation which is known for its loss-kick cycles while drilling. Because of the secondary porosity, drilling through the highly vugular Parigi formation results in total loss circulation of the drilling fluid. Wellbore hydrostatic column instantly decreased while drilling into the loss formation. Utilization of Rotating Control Device (RCD) eliminates the Non-Productive Time (NPT) associated with time consuming mitigation of loss โ kick cycles. RCD enables close loop drilling system when the bearing assembly is installed, capping the annulus and creates pressurize-able wellbore annulus system. Completed with 18-3/4โณ bottom flange, the RCD was connected on top of 21-1/4โณ Annular BOP intermediated with a flange adapter. Parigi limestone was to be drilled with 17-1/2โณ bottom hole assembly to be able setting casing13-3/8โณ successfully. The Mud-Cap drilling system passively seals the annulus at any time by employing the RCD bearing assembly, complementing the existing secondary well control system to prevent the direct gas release to the rig floor. During the operation, unexpected gas release were occurred while wiper trip, however the RCD was successfully kept the pressure away from the rig floor and allowed the driller to strip down the drill string back to the bottom. Details of RCD deployment and setup procedures will be elaborated in this paper.
- Asia (0.96)
- Europe > Russia > Northwestern Federal District > Nenets Autonomous Okrug (0.28)
- Europe > Russia > Northwestern Federal District > Komi Republic (0.28)
- Europe > Russia > Northwestern Federal District > Northwestern Federal District > Nenets Autonomous Okrug > Timan-Pechora Basin (0.99)
- Europe > Russia > Northwestern Federal District > Nenets Autonomous Okrug > Timan-Pechora Basin > Khoreiver Basin > Ardalin Field (0.99)
- Europe > Russia > Northwestern Federal District > Komi Republic > Nenets Autonomous Okrug > Timan-Pechora Basin (0.99)
Abstract Recent drilling operations in Southern Sumatra area, especially Jambi and South Sumatera district, have experienced various problems upon drilling the top section, intermediate section, as well as production section. Overpressures, loss circulation and narrow window between pore and fracture gradient are common problems when drilling the top hole section. In some wells, coal caving and shale sloughing are claimed to be the reason of drilling day extension in this particular section. Overpressure zone within permeable system have cornered several field operators to activate well control system. Some field operators even had to experience blow out. The upper zone of intermediate section sometimes experience tight hole and shale sloughing, which require adequate drilling fluid management. In several wells, reactive shale is identified within the lower intermediate section, which requires the operators to utilize oil based mud to avoid clay swelling. Total loss circulation inflicted with high gas content is a normal condition when penetrating the intermediate and production section. This condition increases operational days when drilled conventionally with high potential of pipe stuck, complications in formation evaluation such as cuttings recovery and well logging, or even forcing the operators to side track the well due to sloughing. Extensive well bore clean out period also have been experienced by some operators when drilled with high barite concentration within the production zone. This paper elaborates a new drilling convention that has been practiced by the operators within these areas, evolving the commonly known Managed Pressure Drilling technique into a culture when penetrating such problems. Success stories will be highlighted when drilling through the top section, intermediate, and production section presenting risks associated from economical and operational perspective.
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.66)
- Geology > Mineral (0.55)
- North America > United States > Montana > Sumatra Field (0.99)
- Asia > Indonesia > Sumatra > South Sumatra > South Sumatra Basin > South Sumatra Field (0.99)
- Asia > Indonesia > Sumatra > Soka Field (0.99)
- Asia > Indonesia > Java > Northwest Java Basin > Talang Akar Formation (0.99)