Production performance of oil shale in-situ conversion with multilateral wells

Song, Xianzhi; Zhang, Chengkai; Shi, Yu; Li, Gensheng

doi:10.1016/j.energy.2019.116145

Cited by 52 publications

(25 citation statements)

References 34 publications

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“…Furthermore, fluid properties and pressure-temperature changes can play a major role in recovery [7]. Song et al [8] introduced a novel method of the utilization of multilateral wells in the oil shale in situ conversion process. The proposed method employs radial branches from the main trunk in the upper and lower oil shale formation as injection and production points.…”

Section: Multilateral Wells As An Asset In Reservoir Managementmentioning

confidence: 99%

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

et al. 2020

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Drilling cost is one of the most critical aspects in the reservoir management plan. Costs may exceed a million dollars; thus, optimal designing of the well trajectory in the reservoir and completion are essential. The implementation of a multilateral well (MLW) in reservoir management has great potential to optimize oil production. The object of this study is to develop an integrated workflow of end-point multilateral well placement optimization integrated with the reservoir simulator supported by artificial intelligence (AI) methods. The paper covers various types of MLW construction, including: horizontal, bi-, tri-, and quad-lateral wells. For quad-lateral wells, the capital expenditure is highest; nevertheless, acceleration of oil production affects the project’s NPV (net present value), indicating the type of well that is most promising to implement in the reservoir. Tri- and quad-lateral wells can operate for 12.1 and 9.8 years with a constant production rate. The decreasing hydrocarbon production rate is affected by reservoir pressure and the reservoir water production rate. Other well design patterns can accelerate water production. The well’s optimal trajectory was evaluated by the genetic algorithm (GA) and particle swarm optimization (PSO). The major difference between the GA and PSO optimization runs is visible with respect to water production and is related to the modification of one well branch trajectory in a reservoir. The proposed methodology has the advantage of easy implementation in a closed-loop optimization system coupled with numerical reservoir simulation. The paper covers the solution background, an implementation example, and the model limitations.

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Section: Multilateral Wells As An Asset In Reservoir Managementmentioning

confidence: 99%

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

et al. 2020

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“…With the expected continuing advancement in technology, more sophisticated well patterns and geometries are possible to implement in practice (Zhou et al, 2008;Yang et al, 2014;Kovács et al, 2014;Bajcsi et al, 2015;Li et al, 2019;Song et al, 2019 andZhe andZhongwei, 2019). Multilateral wells can also offer an alternative to hydraulic fracturing in certain areas of unconventional hydrocarbon production, such as gas production from coal-beds and ductile shale layers, where, due to the ductile behaviour of rocks, artificial fractures will close around the proppant and well productivity will be reduced (Slatt, 2011;Ren et al, 2014 andTorghabeh et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Effects of vertical anisotropy on optimization of multilateral well geometry

Lux

Szanyi

2022

Journal of Petroleum Science and Engineering

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Multilateral wells have been increasingly used in recent years by different industries such as the oil-and gas industry (incl. coal-bed methane (CBM)) and geothermal energy production. The common purpose of these wells in the oil industry and partially in the geothermal industry is to achieve a higher production rate per well without increasing the hydraulic gradient significantly. In geothermal systems the ultimate objective is to improve heat extraction performance by enhancing productivity but also by increasing the heat transfer area.Optimal design of multilateral wells has been the focus of numerous publications in CBM and unconventional oil-and gas production, but as a result of cross-fertilization and technology-transfer among different sectors in the energy industry in the last few years, the focus of research on multilateral wells has turned to enhanced geothermal systems (EGS).Recently, several papers have been published on the use of multilateral wells in deep geothermal reservoirs. Coaxial closed-loop geothermal systems with multilateral wells utilize only the increased heat transfer area due to the laterals while EGS's with multilateral injection and production wells also benefit from the hydrodynamic advantages of such well configurations. However, substantial emphasis isunderstandablyplaced on the effect of artificial and natural fracture networks of EGS reservoirs and less focus is devoted to the impact of vertical permeability anisotropy which can seriously influence the flow pattern of a given configuration. Similarly, in CBM-related studies, the effect of horizontal permeability anisotropy along the face cleats to the butt cleats on multilateral well-design was investigated and vertical permeability anisotropy was not considered.In the current work we present a generalized approach for evaluating the effects of vertical permeability anisotropy on multilateral well geometry by numerical hydrodynamic modelling in an idealized, homogeneous hydrogeological setting.Current paper proposes an alternative modelling approach for representing the non-horizontal branches of multilateral wells by introducing a thin layer for the laterals with the same inclination as the well branches. This approach is then is used to investigate the effect of anisotropy on the flow pattern and near-wellbore drawdown and hydraulic gradient in the case of different branch deviations. Results suggest that the benefits of highly deviated or horizontal laterals emerge when vertical anisotropy is high. Evaluation of branch deviation vs. anisotropy indicates that above approx. 60 • there is no significant benefit in increasing deviation which implies that very highly deviated or horizontal laterals might not necessarily pay off the associated technical challenges and extra costs.

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“…Thus, unconventional petroleum resources must be developed and utilised 1 . Oil shale is a combustible sedimentary rock containing organic material, fine bedding, and high ash and solid combustible mineral contents and can be considered as an alternative energy source to crude oil 2 , 3 . The oil content of oil shale is more than 3.5%.…”

Section: Introductionmentioning

confidence: 99%

Release characteristics of Pb and BETX from in situ oil shale transformation on groundwater environment

Wang

Zhang

Qiu

et al. 2021

Sci Rep

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Oil shale has received attention as an alternative energy source to petroleum because of its abundant reserves. Exploitation of oil shale can be divided into two types: ex situ and in situ exploitation. In situ transformation has been favoured because of its various advantages. Heating of oil shale leads to the production of oil and gas. To explore the influence of solid residue after pyrolysis of oil shale on the groundwater environment, we performed ultrapure water–rock interaction experiments. The results showed that Pb tended to accumulate in solid residues during pyrolysis. Additionally, the Pb concentration goes up in the immersion solution over time and as the pyrolysis temperature increased. In contrast, when we measured the soaking data of benzene series, the concentrations of benzene and toluene produced at temperatures over 350 ℃ were highest in the four oil shale pyrolysis samples after pyrolysis. The water–rock interaction experiment for 30 days led to benzene and toluene concentrations that were 104 and 1070-fold over the limit of China’s standards for groundwater quality. Over time, the content of benzene series was attenuated via biological actions. The results show that in situ oil shale mining can lead to continuous pollution in the groundwater environment.

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Production performance of oil shale in-situ conversion with multilateral wells

Cited by 52 publications

References 34 publications

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

End-Point Model for Optimization of Multilateral Well Placement in Hydrocarbon Field Developments

Effects of vertical anisotropy on optimization of multilateral well geometry

Release characteristics of Pb and BETX from in situ oil shale transformation on groundwater environment

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