Review of directional drilling design and operation of geothermal wells in Indonesia

Marbun, Bonar Tua Halomoan; Ridwan, R.H.; Nugraha, Hikmat; Sinaga, S.Z.; Purbantanu, B.A.

doi:10.1016/j.renene.2021.05.078

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…Even in the 3D model, geothermal wells are sometimes treated as simple straight wells (Wang et al 2019). However, in practice the surface area, access, environment, license, and permit are limited, so that many wells are designed directionally to reach the reservoir (Marbun et al 2021;Wang et al 2020). The application of directional wells significantly affects reservoir parameters and therefore should not be treated simply as point or straight wells in the model (Blöcher et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Qualitative assessment of optimizing the well spacings based on the economic analysis

Sun,

Zhang,

Zhao

et al. 2024

Geotherm Energy

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The design of well spacing significantly influences the sustainability and economic benefit of geothermal energy extraction. However, most studies have predominantly employed heat production-related parameters as indicators of well spacing, and a comprehensive analysis of well spacing design based on an economic model is necessary for practical implementation. In this study, an economic indicator considering the benefits derived from heat production and operating costs is proposed and applied in the Caofeidian, a typical abandoned oilfield in the Bohai Bay Basin. It offers a refined portrayal of directional wells, moving beyond rudimentary representations, to capture their appropriate degree of complexity and behavior in drilling configurations. First, by integrating thermophysical information and site investigation data from previous oil investigations, a heterogeneous 3D model is constructed to forecast the 30-year temperature and pressure evolution. Then, a modified levelized cost of heat (LCOH-HT) is proposed to perform economic analysis in optimizing the well spacing, revealing an optimal range of 300–600 m for the different selected wells. In comparison with results derived solely from heat production considerations, drilling and pumping costs contribute to a 300 m reduction in the optimal well spacing based on the proposed approach, as a larger well spacing leads to increased hydraulic losses and drilling cost, necessitating greater pumping efforts and costs. This finding underscores the need to balance economic and thermal considerations. In addition, we found the difference in the optimal well spacing in space is also caused by the porosity variations. Porosity affects fluid temperature and pressure, leading to changes in the benefits and costs associated with pressure fluctuations. Notably, this novel economic analysis method is not limited to spacing optimization; it can also be used to optimize operating parameters, such as the flow rate, which could provide practical strategies for geothermal energy extraction.

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Section: Introductionmentioning

confidence: 99%

Qualitative assessment of optimizing the well spacings based on the economic analysis

Sun,

Zhang,

Zhao

et al. 2024

Geotherm Energy

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“…Directional drilling technology is the technology of drilling holes along a specific trajectory by directional drilling tools. When this technology is used in geothermal exploitation, it becomes a directional geothermal well [48], as shown in Figure 8. The advantage of this method is that it can avoid special formations such as structures and fracture zones.…”

Section: Directional Drilling Technologymentioning

confidence: 99%

Research on goaf treatment and geothermal comprehensive utilization technology in coal mining subsidence area

Yang

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Goaf treatment and comprehensive utilization of geothermal energy are great significance to the restoration of land resources and sustainable development of energy in coal mining subsidence areas. In this paper, goaf treatment technology and geothermal energy development technology are reviewed in detail. Among them, the goaf treatment technology mainly includes: caving treatment method, filling treatment method, support method, closed isolation method and joint treatment method. Geothermal development technology mainly includes: shallow ground source heat pump technology, coaxial casing development technology, pumping and reinjection technology, directional drilling technology, U-type precision docking drilling technology. The systematic idea of filling treatment and geothermal comprehensive utilization in coal mining subsidence area is proposed, and the technology is described in detail through three cases. The research results can provide innovative inspiration for subsidence control and comprehensive utilization of geothermal energy in coal mining subsidence area, and has broad application prospects.

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“…However, it often faces with complex situations such as lost circulation during workover process of high‐temperature gas well. Minor loss will lead to increased material consumption, rising drilling costs, and serious loss will cause production interruption, which will result in collapse and blowout, and even lead to the abandonment of the whole high‐temperature gas well 1–3 . Therefore, curing the lost circulation problem is the key to realize effective exploration of high‐temperature gas wells.…”

Section: Introductionmentioning

confidence: 99%

Novel smart plugging material for high‐temperature gas well

Li¹,

Zhou

Liu³

2023

Polymer Engineering & Sci

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A novel smart material is developed, which is synthesized by succinic anhydride, epoxy resin, and zinc acetylacetone hydrate. The smart material has excellent properties of self‐healing, shape memory, and degradation. The experimental results of performance characterization show that the material has good thermal stability. The glass transition temperature is adjustable between 100 and 120°C, and the storage modulus can reach 20 GPa. The maximum thermal expansion at 50°C is less than 15%, the thermal expansion equilibrium time at 120°C is less than 5 min, and the maximum thermal expansion is 131%. The stress relaxation time at 120°C is more than 2 h, which can slowly self‐heal on the basis of maintaining the mechanical strength. When the NaOH content is 1.5%, the degradation equilibrium can be reached in about 3 h, and the maximum degradation rate is 86%. The comprehensive performance evaluation shows that after hot rolling at 120°C/16 h, the material has no effect on the rheology and filtration properties. When plugging the fracture width of 5 × 4 mm, the pressure bearing capacity reaches 10 MPa. Its main mechanism is temperature‐sensitive expansion, and the stress relaxation effect heals and blocks the micro pore throat.

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Review of directional drilling design and operation of geothermal wells in Indonesia

Cited by 8 publications

References 21 publications

Qualitative assessment of optimizing the well spacings based on the economic analysis

Qualitative assessment of optimizing the well spacings based on the economic analysis

Research on goaf treatment and geothermal comprehensive utilization technology in coal mining subsidence area

Novel smart plugging material for high‐temperature gas well

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