Studies on geothermal power generation using abandoned oil wells

Cheng, Wen‐Long; Li, Tongtong; Nian, Yong‐Le; Wang, Changlong

doi:10.1016/j.energy.2013.07.008

Cited by 128 publications

(39 citation statements)

References 19 publications

(17 reference statements)

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“…Hasan (1995), Hasan and Kabir (1991, 1994, 2009 and Hasan et al (2007a, b) did a series of works on the steady-state heat conduction rate and transient heat conduction rate in the formation. Cheng et al (2011Cheng et al ( , 2012Cheng et al ( , 2013Cheng et al ( , 2014 presented several models for predicting heat loss rate in the formation. All of these great works laid a solid foundation for later study.…”

Section: Introductionmentioning

confidence: 99%

The heat and mass transfer characteristics of superheated steam in horizontal wells with toe-point injection technique

Sun

Yao

2018

J Petrol Explor Prod Technol

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Little efforts were done on the heat and mass transfer characteristics of superheated steam (SHS) flow in the horizontal wellbores. In this paper, a novel numerical model is presented to analyze the heat and mass transfer characteristics of SHS in horizontal wellbores with toe-point injection technique. Firstly, with consideration of heat exchange between inner tubing (IT) and annuli, a pipe flow model of SHS flow in IT and annuli is developed with energy and momentum balance equations. Secondly, coupled with the transient heat transfer model in oil layer, a comprehensive mathematical model for predicting distributions of pressure and temperature of SHS in IT and annuli is established. Then, type curves are obtained with numerical methods and iteration technique, and sensitivity analysis is conducted. The results show that (1). The decrease in SHS temperature in annuli caused by heat and mass transfer to oil layer is offset by heat absorbtion from SHS in IT. (2). SHS temperature in both IT and annuli increases with the increase in injection pressure. (3). IT heat loss rate decreases with the increases in injection pressure. (4). Increasing pressure can improve development effect. Keywords Superheated steam injection · Toe-point injection technique · Horizontal wellbores · Distributions of pressure and temperature · Heavy oil recovery List of symbols

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Section: Introductionmentioning

confidence: 99%

The heat and mass transfer characteristics of superheated steam in horizontal wells with toe-point injection technique

Sun

Yao

2018

J Petrol Explor Prod Technol

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“…However, with the change of energy demand and with the progress of technology, the recovery of heavy oil has come more into focus. Predicting thermal parameters of thermal fluid along the wellbores is significant for optimizing heavy oil recovery (Cheng et al 2011(Cheng et al , 2012(Cheng et al , 2013Dong et al 2014;Gu et al 2014Gu et al , 2015aWei et al 2015;Fan et al 2016). …”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of superheated steam flow in dual-tubing wells

Sun

Yao

2017

J Petrol Explor Prod Technol

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In this paper, a novel model is presented to estimate the thermophysical properties of superheated steam (SHS) in dual-tubing wells (DTW). Firstly, a mathematical model comprised of the mass conservation equation, momentum balance equation and energy balance equation in the integral joint tubing (IJT) and annuli is proposed for concentric dual-tubing wells (CDTW), and in the main tubing (MT) and auxiliary tubing (AT) for parallel dual-tubing wells (PDTW). Secondly, the distribution of temperature, pressure and superheat degree along the wellbores are obtained by finite difference method on space and solved with iteration technique. Finally, based upon the validated model, sensitivity analysis of injection temperature is conducted. The results show that: (1) effect of injection temperature difference between MT and AT on temperature profiles is weak compared with that between the IJT and annuli. (2) Temperature gradient in IJT and annuli near wellhead is larger than that in MT and AT. (3) Superheat degree in both CDTW and PDTW increases with the increase in injection temperature in IJT and MT, respectively. (4) Superheat degree in IJT and MT decreases rapidly near wellhead, but the superheat degree in annuli and AT has an increase. (5) Thermal radiation and convection are the main ways of heat exchange between MT and AT. This paper gives engineers a novel insight into what is the flow and heat transfer characteristics of SHS in DTW, and provides an optimization method of injection parameters for oilfield.

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“…Several studies have proposed the use of the borehole exchangers to convert the abandoned oil wells into geothermal ones (Kujawa et al 2006;Zhang et al 2008;Wang et al 2009;Davis and Michaelides 2009;Bu et al 2012;Cheng et al 2013;Templeton et al 2014;Cheng et al 2014). Considering the drilling costs almost 25 % of the total costs of the power plant (Hance 2005), and the high costs of closure of the oil fields, the use of the WBHX could be an economic advantage both for oil companies and for geothermal companies.…”

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confidence: 99%

“…In the proposed solution, a binary cycle plant with two stage of heat exchange converts the thermal power into electricity, as an alternative of a direct binary power plant (Davis and Michaelides 2009;Bu et al 2012;Cheng et al 2013).…”

mentioning

confidence: 99%