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Collaborating Authors
Yustendi, Kiki
LWD Acquisition of Caliper and Drilling Mechanics as a New Approach on Geothermal Drilling Operation, a Case Study in Sorik Marapi Field – Indonesia
Manurung, Vinda Berlianta (Halliburton) | Warkhaida, Laila (Halliburton) | Hutabarat, David Jockey (Halliburton) | Maulana, Taufan (Halliburton) | Wisnuwardhana, Sentanu (KS ORKA) | Simatupang, Christovik (KS ORKA) | Sanjaya, Dhani (KS ORKA) | _, Ashadi (KS ORKA) | Pasikki, Riza (KS ORKA) | Putra, Redha Bhawika (KS ORKA) | Yustendi, Kiki (KS ORKA)
Abstract The geothermal drilling environment presents many obstacles that limit the use of directional-drilling and logging-while-drilling (LWD) technologies, such as borehole washout, mud losses, severe vibration, and high temperature. The case study presented in this paper demonstrates a novel practice to enhance data logging in geothermal drilling by deploying advanced telemetry and LWD technologies. This operation aims for continuous improvement in geothermal drilling operations. The case study covers the 12.25-in. hole section of well XXE-05 in the Sorik Marapi Geothermal Field. The LWD string consisted of electromagnetic (EM) telemetry, pressure while drilling (PWD), vibration (DDSr), and acoustic caliper (ACAL). Through this tool configuration, the operator acquired drilling mechanics and caliper logs in real-time and recorded mode, enabling effective monitoring and evaluation of wellbore stability. Throughout the real-time acquisition, EM telemetry provided a data rate to the surface unit three times faster than conventional tools. Furthermore, with the integration of caliper and drilling mechanics data (vibration and equivalent circulating density), the borehole conditions became more visible to the directional driller, allowing better control of drilling parameters to minimize vibration and achieve optimum hole cleaning in washed-out or tight formation sequences. The recorded data from the caliper sensor indicated an average of 8.6% washout for the entire 12.25-in. interval. Washout intervals were compared with loss occurrence during drilling and the presence of smectite-bearing paleosols, showing that the washout zones associate with the latter, supporting the smectite-bearing paleosol model in explaining the cause of stuck pipe incidents in the Sorik Marapi field. In addition, measurements of hole ovality were compared with the interpreted fault trend, providing further insight into the existing model. In general, this LWD case study has given added value through geothermal borehole characterization, from drilling hazard identification to subsurface analysis. Identified challenges while running LWD in this geothermal environment were addressed for future improvements, such as the effect of tool eccentricity and the impact of vibration. Perusal of both real-time and recorded caliper and drilling-mechanics data has opened various possibilities for maximizing the sensor usage in future wells.
- Asia > Indonesia (0.84)
- North America > Canada > Alberta (0.28)
- Geology > Geological Subdiscipline > Geomechanics (0.93)
- Geology > Structural Geology (0.93)
- Geology > Mineral > Silicate > Phyllosilicate (0.71)
- Energy > Renewable > Geothermal > Geothermal Energy Engineering > Geothermal Drilling (1.00)
- Energy > Oil & Gas > Upstream (1.00)
BD Gas Field Near-HPHT and Critical Sour Development: A Journey to Maintain Well Integrity
Tian, Yi (HCML) | Yustendi, Kiki (HCML) | Lian, Jihong (HCML) | Etuhoko, Michael (HCML) | Soufanny, Alfon (HCML) | Jiang, Kai (CNOOC International Limited) | Luo, Limin (CNOOC International Limited) | Xiang, Ming (CNOOC International Limited) | Chang, Congbing (CNOOC International Limited) | Diemert, Anthony Paul (Husky Energy)
Abstract BD Gas Field is located in offshore in the Madura Strait, Indonesia, and has a total of four producing wells - one vertical (Well Y1) and three horizontal (Well Y2, Well Y3, and Well Y4) from an unmanned platform. Its reservoir was considered near HPHT and critical sour with 8,100 psi bottom hole pressure, 300°F bottom hole temperature, 5.5% CO2 and 5,000 ppm H2S. This paper highlights on the Company journey to maintain well integrity during well design phase, well construction phase, and production phase of BD Gas Field. During well design phase, material selection and design for 9-5/8 in. intermediate casing, 7 in. production casing, and 4-1/2 in. tubing were based on the expected life of the well and reservoir properties in accordance to the requirements of NACE. Cementing design for 7 in. production casing cement was tested and analyzed in the laboratory for 60 days in the HPHT chamber simulating reservoir properties. Top of cement was designed to the mud line to minimize wellhead growth. Completion design was monobore type and divided into lower, intermediate, and upper completion strings. All packers were V-0 (zero bubble) rating. Maintaining well integrity during well construction phase was challenging. Batch drilling and completion was applied, and at all times, the wells were required to be suspended with proper and adequate barriers. During drilling and well clean-up phase, inter-casing pressure management (i.e., annulus pressure, wellhead growth monitoring, bleed off program, etc.) was implemented to maintain the casing and tubing integrity. During production phase, routine wellhead growth measurement, constant monitoring and bleed off program were developed and communicated with related departments. Pressure control valves and alarm system were installed and tested to the annulus. In additional to the wellhead growth, transverse wellhead movement was observed in one of the wells especially during rough sea conditions. In order to reduce the tranverse wellhead movement which may induce more stress on the surface pipings and connections, it was planned to install under water shims in between the conductor pipe and platform jacket guide funnel. Some surface piping and platform modification were also considered because wellhead growth leads to limitations on gas production to prevent safety issues.
- Geology > Rock Type (0.46)
- Geology > Geological Subdiscipline > Geomechanics (0.46)