Relevant bibliographies by topics / Wellbore heat exchanger

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Wellbore heat exchanger'

Author: Grafiati
Published: 14 March 2023

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Journal articles on the topic "Wellbore heat exchanger"

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Zhang, Liang, Songhe Geng, Jun Kang, Jiahao Chao, Linchao Yang, and Fangping Yan. "Experimental Study on the Heat Exchange Mechanism in a Simulated Self-Circulation Wellbore." Energies 13, no. 11 (June 6, 2020): 2918. http://dx.doi.org/10.3390/en13112918.

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Self-circulation wellbore is a new technique for geothermal development in hot dry rocks (HDR), which uses a U-shape channel composed of tubing and casing as the heat exchanger. In this study, a self-circulation wellbore in HDR on a laboratory scale was built, and a serial of experiments were conducted to investigate the heat exchange law and the influencing factors on the heat mining rate of the wellbore. A similarity analysis was also made to estimate the heat-mining capacity of the wellbore on a field scale. The experimental results show that the large thermal conductivity and heat capacity of granite with high temperature can contribute to a large heat-mining rate. A high injection rate can cause a high convective heat transfer coefficient in wellbore, while a balance is needed between the heat mining rate and the outlet temperature. An inner tubing with low thermal conductivity can significantly reduce the heat loss to the casing annulus. The similarity analysis indicates that a heat mining rate of 1.25 MW can be reached when using a 2000 m long horizontal well section in a 150 °C HDR reservoir with a circulation rate of 602.8 m3/day. This result is well corresponding to the published data.
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Sharma, P., A. Q. Al Saedi, and C. S. Kabir. "Geothermal energy extraction with wellbore heat exchanger: Analytical model and parameter evaluation to optimize heat recovery." Renewable Energy 166 (April 2020): 1–8. http://dx.doi.org/10.1016/j.renene.2020.11.116.

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Cheng, Sharon W. Y., Jundika C. Kurnia, Agus P. Sasmito, and Luluan A. Lubis. "The Effect of Triangular Protrusions on Geothermal Wellbore Heat Exchanger from Retrofitted Abandoned Oil Wells." Energy Procedia 158 (February 2019): 6061–66. http://dx.doi.org/10.1016/j.egypro.2019.01.511.

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Alimonti, C., and E. Soldo. "Study of geothermal power generation from a very deep oil well with a wellbore heat exchanger." Renewable Energy 86 (February 2016): 292–301. http://dx.doi.org/10.1016/j.renene.2015.08.031.

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Gizzi, Martina, Glenda Taddia, and Stefano Lo Russo. "Reuse of Decommissioned Hydrocarbon Wells in Italian Oilfields by Means of a Closed-Loop Geothermal System." Applied Sciences 11, no. 5 (March 9, 2021): 2411. http://dx.doi.org/10.3390/app11052411.

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Geological and geophysical exploration campaigns have ascertained the coexistence of low to medium-temperature geothermal energy resources in the deepest regions of Italian sedimentary basins. As such, energy production based on the exploitation of available geothermal resources associated with disused deep oil and gas wells in Italian oilfields could represent a considerable source of renewable energy. This study used information available on Italian hydrocarbon wells and on-field temperatures to apply a simplified closed-loop coaxial Wellbore Heat Exchanger (WBHE) model to three different hydrocarbon wells located in different Italian oilfields (Villafortuna-Trecate, Val d’Agri field, Gela fields). From this study, the authors have highlighted the differences in the quantity of potentially extracted thermal energy from different analysed wells. Considering the maximum extracted working fluid temperature of 100 °C and imagining a cascading exploitation mode of the heat accumulated, for Villafortuna 1 WBHE was it possible to hypothesise a multi-variant and comprehensive use of the resource. This could be done using existing infrastructure, available technologies, and current knowledge.
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Immanuel, L. G., G. S. F. U. Almas, and T. M. Dimas. "Preliminary design study of wellbore heat exchanger in binary optimization for low – medium enthalpy to utilize non-self discharge wells in Indonesia." IOP Conference Series: Earth and Environmental Science 254 (April 29, 2019): 012016. http://dx.doi.org/10.1088/1755-1315/254/1/012016.

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Carpenter, Chris. "Flow Simulator Optimizes Geothermal Heat Extraction From End-of-Life Wells." Journal of Petroleum Technology 75, no. 01 (January 1, 2023): 67–69. http://dx.doi.org/10.2118/0123-0067-jpt.

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_ This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 208928, “Optimizing Geothermal Heat Extraction From End-of-Life Oil and Gas Wells Using a Transient Multiphase Flow Simulator,” by David Sask, SPE, David Sask Technology; Peter Graham, Algar Geothermal; and Carlos Nascimento, SPE, Schlumberger. The paper has not been peer reviewed. _ The complete paper presents results from evaluation of the rate of thermal energy that can be extracted under various completion scenarios using a transient flow simulator. This evaluation was conducted on closed-loop systems wherein the fluids are contained within the wellbore and surface facilities and do not involve any formation fluids. The use of a multiphase flow simulator for this study provides a road map for understanding thermal energy potential and important variables when considering extraction of geothermal energy from existing oil and gas wells. Introduction In Western Canada, there are, at the time of writing, more than 130,000 inactive and suspended wells. This includes more than 3,000 orphan wells but excludes an additional 115,000 abandoned wells. For some of these wells, end-of-life liability can be turned into an asset. This paper presents an overview of one system for extracting geothermal energy from a single well configuration using a closed-loop mode of operation. Equipment and Processes The technology described in the paper calls for inserting an insulated inner tubing inside the existing production casing immediately above the sealed base of the well. Cooler water is injected down the annulus of the coaxial configuration. As the water descends, it collects heat from zones where the adjacent rock is hotter. At the base of the well, the heated water is then redirected to surface from the open base of the insulated inner tubing. At surface, the heat is recovered, and the resulting cooled water is reinjected into the well to complete the circuit. This closed-loop process has little pump demand because there is no hydraulic head. This technology was developed in the late 1990s but did not gain much traction because of the excessive cost of drilling, inadequate and expensive insulated tubing, and poor heat and temperature recoveries. The technology has developed enhancements to overcome the latter limitation. One key enhancement is to operate the well in two different modes. The first mode operates as a storage mode during periods when no heat demand exists. Water is pumped into the annulus of the well and returned to surface within the insulated inner tube. Once the heated water reaches the surface, it is reinjected directly into the same well without any heat being recovered at surface. As the returning hot water descends, it transfers heat to the adjacent cement and rock, which creates a heat jacket in the upper sections of the well. When heat demand returns, the second mode, referred to as extraction mode, commences. The only change is that the ascending heated water is redirected to a heat exchanger, which extracts only heat sufficient to meet demand; then, the partially heated water is returned to the well to collect additional heat.
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Yang, Mou, Yingfeng Meng, Gao Li, Yongjie Li, Ying Chen, Xiangyang Zhao, and Hongtao Li. "Estimation of Wellbore and Formation Temperatures during the Drilling Process under Lost Circulation Conditions." Mathematical Problems in Engineering 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/579091.

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Significant change of wellbore and surrounding formation temperatures during the whole drilling process for oil and gas resources often leads by annulus fluid fluxes into formation and may pose a threat to operational security of drilling and completion process. Based on energy exchange mechanisms of wellbore and formation systems during circulation and shut-in stages under lost circulation conditions, a set of partial differential equations were developed to account for the transient heat exchange process between wellbore and formation. A finite difference method was used to solve the transient heat transfer models, which enables the wellbore and formation temperature profiles to be accurately predicted. Moreover, heat exchange generated by heat convection due to circulation losses to the rock surrounding a well was also considered in the mathematical model. The results indicated that the lost circulation zone and the casing programme had significant effects on the temperature distributions of wellbore and formation. The disturbance distance of formation temperature was influenced by circulation and shut-in stages. A comparative perfection theoretical basis for temperature distribution of wellbore-formation system in a deep well drilling was developed in presence of lost circulation.
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Alimonti, C., E. Soldo, D. Bocchetti, and D. Berardi. "The wellbore heat exchangers: A technical review." Renewable Energy 123 (August 2018): 353–81. http://dx.doi.org/10.1016/j.renene.2018.02.055.

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Zheng, Miaozi, Renjie Yang, Jianmin Zhang, Yongkai Liu, Songlin Gao, and Menglan Duan. "An Interface Parametric Evaluation on Wellbore Integrity during Natural Gas Hydrate Production." Journal of Marine Science and Engineering 10, no. 10 (October 18, 2022): 1524. http://dx.doi.org/10.3390/jmse10101524.

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Based on the whole life cycle process of the economic exploitation of natural gas hydrate, this paper proposes the basic problem of stabilizing the wellbore for the basic conditions that must be met to ensure the integrity of the wellbore for exploitation: revealing the complex mechanism of fluid–solid–heat coupling in the process of the physical exchange of equilibrium among gas, water, and multiphase sand flows in the wellbore, hydrate reservoir, and wellbore, defining the interface conditions to ensure wellbore stability during the entire life cycle of hydrate production and proposing a scientific evaluation system of interface parameters for wellbore integrity.
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Dissertations / Theses on the topic "Wellbore heat exchanger"

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GIZZI, MARTINA. "Geothermal resources exploitation from disused hydrocarbon wells: simplified tools for a reuse strategies analysis." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2966345.

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Book chapters on the topic "Wellbore heat exchanger"

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Jiang, Donglei, Shujie Liu, Yi Huang, Wenbo Meng, Huan Diao, Bicheng Gan, and Fabao Zou. "Wellbore Temperature-Pressure Coupling Model Under Deep-Water Gas Well Intervention Operation." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220295.

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The accurate forecast of wellbore temperature and pressure during intervention operations is critical to the long-term exploitation of deep-water oil and gas resources. A wellbore temperature prediction model was constructed in the seawater and formation sections based on Hasan and Kerber’s gas-liquid two-phase flow heat transfer model and integrated with the features of intervention operations. Simultaneously, the heat exchange produced by the change in fluid flow rate caused by the tool placement was evaluated. The wellbore pressure prediction model is developed in the intervention tool and intervention operation sections, and the friction gradient is modified by introducing the intervention operation.The established temperature and pressure model is coupled and solved iteratively, and the disturbance law of the wellbore temperature and pressure field induced by the intervention operation is investigated. The results show that the pressure in the wellbore gradually decreases when the tool is removed; the temperature at the mudline of the wellbore with high gas production is higher, and the wellhead pressure is low; the tool size is weakly sensitive to the wellbore; and the wellbore temperature and pressure are weakly sensitive to the running speed. The aforesaid findings have some guiding relevance for the design of the intervention operation plan, as well as the prediction and prevention of hydrate in the wellbore during deep-water gas well cleaning and blowout.
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Conference papers on the topic "Wellbore heat exchanger"

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Duggal, Rohit, Ramesh Rayudu, Jim Hinkley, John Burnell, and Mark McGuinness. "Method of Characteristics Based Model for a Coaxial Borehole Heat Exchanger." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210689-ms.

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Abstract Mature petroleum fields provide readily accessible wells for geothermal energy extraction in many parts of the world. Likewise, the major hydrocarbon-producing region of New Zealand, the Taranaki region, has many mature wells with high temperatures (∼150 °C) measured at the bottom. Borehole heat exchangers could be a cost-effective way of producing geothermal energy from these wells. Therefore, the purpose of this study is to present a mathematical model capable of evaluating the potential of geothermal energy production from unused wells. We first set up our mathematical model using the Method of Characteristics for the wellbore heat exchangers. A co-axial borehole heat exchanger is selected for our study due to its simple design and popularity in use. The model is then validated against the analytical results available in the literature. For the first time, a study utilizing borehole heat exchangers to produce geothermal energy is being conducted in New Zealand. This study will help boost interest in reusing unused wells for residential and industrial direct use applications. Based on our model, the capability of alternate fluids such as supercritical CO2 to further enhance the performance of heat exchange will be analyzed in the future.
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Fleckenstein, William, Jennifer Miskimins, Hossein Kazemi, Alfred Eustes, Dias Abdimaulen, Balnur Mindygaliyeva, Ozan Uzun, et al. "Development of Multi-Stage Fracturing System and Wellbore Tractor to Enable Zonal Isolation During Stimulation and EGS Operations in Horizontal Wellbores." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210210-ms.

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Abstract This paper discusses the progress on a project funded by the DOE Utah FORGE (Frontier Observatory for Research in Geothermal Energy) for the development of a subsurface heat exchanger for Enhanced Geothermal Systems (EGS) using unique casing sleeves cemented in place and are used first as a system for rapid and inexpensive multi-stage stimulations and second to perform conformance control functions at 225 °C. The proposed sleeves will use a single-sized dissolvable ball to open for fracture stimulation. After stimulation, and once the balls dissolve, the sleeves are open for immediate fluid injection. A separately designed wellbore tractor specific for both fluid detection and valve manipulation is then deployed to detect and control the injection entry points to create an effective EGS through paired horizontal injectors and open hole producers. The wells will be connected through multiple networks of induced and natural fractures that can be controlled throughout the field life.
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McSpadden, Albert R., Oliver D. Coker, and Spencer Bohlander. "Closed-loop Geothermal Well Design with Optimization of Intermittent Circulation and Thermal Soak Times." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210307-ms.

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Abstract A closed-loop geothermal well design is presented which incorporates both wellbore configuration and completions components as well as a strategy for well operations which together achieve meaningful production of thermal energy. Planning and optimization of intermittent circulation enable "thermal soak" periods to thermally charge the working fluid while mitigating thermal depletion in the reservoir. Technical challenges of a viable closed-loop downhole heat exchanger scheme are discussed. Advantages of Closed-loop Geothermal Systems (CLGS) compared to Enhanced Geothermal System (EGS) designs are also considered. Fully transient and closely coupled thermal-hydraulic simulations using an industry standard software model were performed on a representative well design and schedule of well circulation operations. The simulation model accounts for detailed conduction, forced and natural convection and radiative heat transfer modes in both the wellbore and the formation as appropriate. Detailed thermophysical characteristics are incorporated into the model for all wellbore completion components which include industry available OCTG grades and sizes, specialized variations such as Vacuum-Insulated-Tubing (VIT), insulating fluids including nitrogen, conventional and foamed cements and syntactic foam as well as the variation in the earth formation. Water is used as a demonstration working fluid and the full spectrum of fluid behavior for all potential phase and quality regimes are accounted for throughout the circulation flow path and at the surface wellhead. Resultant transient temperatures over an extended sequence of flow and shut-in periods are reported inclusive of near-by earth formation temperatures out to the far-field boundary. Comparisons with analytical reference models are also considered. Well simulations presented herein achieve repeatable and extended return fluid temperatures in the range of 200°F to over 400°F. In combination with a pad well concept, this allows for long-term steady energy generation. Clearly the generation of useful temperatures and ultimately justifiable enthalpy delivery with closed-loop configurations is a challenge. Further work on innovative design concepts, refinements such as integration with surface plant processes to optimize surface pressures and pump requirements as well as the recycling of heated water, and identification of optimal locations for deployment will progress this work. Advantages of fully closed-loop well systems include avoidance of potential problems associated with traditional geothermal and EGS wells such as induced seismicity and bedding plane slippage, formation interface skin quality, reservoir degradation over time and introduction of corrosive formation species into the wellbore, and disposal thereof. Combined optimization of both wellbore configuration components and staged circulation and thermal soak periods is shown here to provide a realistic option for significant steady heat generation. Impact of various completion components on operational efficiency can be quantified. In particular, the optimal staging of intermittent circulation operations and their associated thermal soak periods is a featured design option which has not received wide consideration in the literature.
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Santos, Livio, and Arash Dahi Taleghani. "Impact of Microannulus on the Heat Exchange at the Bottomhole." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210149-ms.

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Abstract Every injection and production operation are accompanied by heat transfer between the wellbore fluids and the formation. Often these fluids are only circulated inside the wellbore. However, the presence of microannulus, besides compromising wellbore integrity, could have a negative impact on the rate of heat transfer to and from the formation. Thermal conductivity could be critical in CO2 sequestration, thermal EOR and specially closed-loop geothermal wells. This study aims to evaluate the impact of microannulus on the heat exchange rate at the bottomhole by combining numerical results and field measurements. We propose to identify presence of microannulus by analyzing distributed temperature sensing (DTS) measurements acquired at different times from EOR and closed-loop geothermal wells. In a DTS system, temperatures are recorded continuously along an optical sensor cable placed in the wellbore. The analysis is combined with numerical simulations considering different operational conditions to estimate the severity of the microannulus. In extreme cases, the presence of microannulus was found to decrease the bottomhole temperature in 2.5%. The results also highlight the importance of proper cementing design to ensure wellbore integrity and avoid heat loss.
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Закиров, Марат Финатович, Айрат Шайхуллинович Рамазанов, and Рим Абдуллович Валиуллин. "ESTIMATION OF THE FLOW RATE EFFECT ON HEAT EXCHANGE IN THE WELLBORE USING A QUASI-STATIONARY THERMOGRAM." In Технические и естественные науки: сборник избранных статей по материалам Международной научной конференции (Санкт-Петербург, Октябрь 2020). Crossref, 2020. http://dx.doi.org/10.37539/tns293.2020.88.61.002.

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В работе представлен способ расчета термограммы для квазистационарной работы скважины. Установлено влияние дебита потока на возникающий тепло-обмен с окружающими горными породами. Результаты работы могут быть использованы для анализа профиля температуры в зависимости от расхода скважины. The paper presents a method for calculating a thermogram for quasi-stationary well operation. The influence of the flow rate on the resulting heat exchange with the surrounding rocks is established. The results of the work can be used to analyze the temperature profile depending on the well flow rate.
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Ahmed, Khaled I., Abobakr Almashhor, and Mohamed H. Ahmed. "Simulation-Based Correlation for Saved Energy in Ground Source Heat Exchangers for Middle East Region." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-66381.

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Abstract Shallow geothermal energy is a renewable energy source used to reduce electric demand to produce cooling and heating of buildings. The temperature at a specific ground level is constant year-round depends on the geographic region. It can be utilized by exchanging heat in the hot weather (cooling) or cold weather (heating) using Ground Source Heat Exchangers GSHE. Many attempts have been proposed to investigate the GSHE controlling factors with a lack of interconnection effects of mutual inclusive parameters. The current work investigates the interconnection relation of seven factors; three geometrical factors, two thermophysical factors, and two operational and environmental factors. The studied geometrical factors are the wellbore diameter and length and the tube diameter. The thermal conductivities of the wellbore grout and soil are the studied two thermophysical properties. The two studied operational and environmental factors are the circulating fluid flow rate, circulating fluid input temperature difference with the soil temperature. A 2D axisymmetric CFD model is built to investigate the effect of the controlling parameters on the targeted output saved energy per tube length. Third-order surface response of the main output is achieved using a hybrid Box-Behnken Central-Composite design of experiments methods DOE. The Box-Behnken method concerns the mid of extremes, and the Central-Composite method concerns the rotatable variable interconnections. Although both methods are designed for second-order response surfaces, the proposed hybrid method can accurately predict third-order correlation using the Stepwise regression method on 136 design points. The nonlinear correlation is verified using another 100 random verification points, showing a root mean squared error of less than 1.5 [W/m]. The significance of each parameter on the target normalized saved energy is presented and discussed. The pipe diameter, grout conductivity, soil conductivity, and temperature difference are the most significant parameters controlling the GSHE performance. The water mass flow rate is lesser significant, while the grout diameter is insignificant. The response surface study has shown high normalized saved energy of 100 [W/m] of the pipe length for the investigated domains.
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Mirabolghasemi, Maryam, Mohammad Heshmati, Dakota Thorn, Blake Shelton, and Fatou Diop. "Repurposing End-of-Life Wells for Geothermal Energy Production: An Evaluation of Mississippi Wells." In SPE Symposium: Decommissioning and Abandonment. SPE, 2021. http://dx.doi.org/10.2118/208498-ms.

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Abstract End-of-life production or injection wells may be converted into wellbore heat exchangers for geothermal energy extraction. Whether this conversion is technically and economically feasible depends on several factors such as geothermal potential of the formation, well depth, and working fluid circulation parameters. Here we present a case study where we analyze these parameters and determine their optimum operational brackets. We focus on repurposing active wells that are located in regions with high geothermal potential in the state of Mississippi. Geothermal gradient map of the state of Mississippi was used to select potential candidate wells. Well logs of these candidate wells were used to find formation temperature and other properties such as well diameter and depth. Next, we conducted heat transfer calculations to estimate the temperature rise of various working fluids as a result of circulating inside these wellbores. We ran sensitivity analyses to determine the effect of circulation rate, tubing insulation, and time. Finally, we estimated the power production potential of each well. Our results indicate that geothermal energy production through repurposed end-of-life wells may be viable depending on well depth and geothermal potential of the region. With insulated tubing, the thermal energy delivered by a number of candidate wells is sufficient for a small-scale binary power plant with organic Rankine cycle.
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Feng, Ming, Catalin Teodoriu, and Jerome Schubert. "The Transient Temperature Prediction in the Deepwater Riserless Well." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54023.

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The offshore wells are subject to hostile environments of such areas as the North Sea, GOM and the high arctic. The strong loop ocean currents and induced eddies can pose significant problems for deep-water well. Broadly divided ocean currents, surface currents, bottom currents and vertical currents, interact with the deep water well structures as one of environmental forces. One of the engineering challenges in deep water drilling is temperature gradient. In the past the temperature in the wellbore was ignored and an isothermal system was assumed because no practical means existed to determine the well bore temperature profile. But the fact is that the negative thermal gradient exists between surface to seafloor and it becomes positive below the seafloor. The extreme values could be as low as 40°F and as high as 150∼200°F. In addition to low temperature condition, the significant heat exchange also occurs for high temperature and geothermal reservoirs. The universal matrix form of implicit finite differential equations is introduced to predict the temperature profile of the fluid in the well and near-wellbore formation. This paper is to combine various factors together to derive a solver for the transient temperature modeling during the dirculation of riserless drilling, which can be the basis to describe the near-wellbore well stability under geo-thermal stress and predict the annular pressure during HPHT injection or production, which can also be used to including but not limited to the dynamic temperature profile and bottom-hole temperature, improving cementing program design, casing thermal stresses to be determined.
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Hessami, Mir Akbar, and Justine White. "Improved Fluid Circulation and Heat Transfer in Geothermal Reservoirs due to Superior Fracture Network in Hot Dry Rocks (HDR)." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91271.

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As the reduction of carbon emissions becomes an increasingly pressing issue, a larger emphasis is being placed on the need for the development of renewable energy. One such option is geothermal energy which utilizes the heat from the earth’s crust; it presents a vast potential for the production of commercial scale base-load power generation. However, the conventional techniques used in the stimulation of hot dry rocks (HDR) geothermal wells are not very effective in producing a permeable reservoir for heat exchange between the rock mass and the working fluid. To increase the permeability of geothermal reservoirs, a new stimulation technique (developed by CSIRO - Commonwealth Scientific and Industrial Research Organisation) which involves isolating sections of the well for controlled planar fracture growth can be used. However, if these notches/fractures are placed too closely together they will interact with one another, resulting in a deviated fracture path. A two dimensional numerical model has thus been developed to study conditions under which adjacent fractures will interact with one another. This study aims to verify the numerical model through stimulating a number of granite blocks, and drawing comparisons between the observed fracture pattern and that predicted by the model. To achieve this goal, the stimulated and fractured granite blocks were sectioned and their fracture patterns were extracted using a MATLAB code, before being reconstructed in their respective positions. Stimulation was carried out firstly using conventional techniques, and then by trialling the method proposed by CSIRO. Observation of the reconstructed images showed good agreement between the model predictions and the observed fracturing patterns in two-dimensions. However, the three-dimensional pattern in the notched, perpendicular well-bore was observed as a ‘half cylinder’. This was counter intuitive as it was expected that radial symmetry of the fractures would be observed resulting in a ‘bowl’ shape. It was therefore concluded that while the model was unable to accurately predict the three-dimensional geometry of an array of fractures, stimulation through a notched perpendicular wellbore was very effective in the production of a controlled system of fractures with an improved fluid flow and heat exchanging surface area of the reservoir in comparison to the conventional techniques.
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Diao, Haoyu, Honghai Fan, Bernt Johan Leira, Sigbjørn Sangesland, Yuguang Ye, Yuhan Liu, and Lucas Cantinelli Sevillano. "A Calculation Model for the Temperature Field of the Shallow Submarine Strata Considering the Heat of Hydration of Cement Slurry." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31812-ms.

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Abstract During offshore oil and gas resource exploration, the large amount of heat generated by cement hydration will cause the hydrates around the wellbore to decompose, leading to cementing operation failure or more serious types of accidents. Therefore, the influence of the heat on temperature of hydrate layer, overlying and underlying strata during the cementing process is studied in this paper. A calculation model for the temperature field of deep-water hydrate layer cementing is established. The model considers the influence of cement slurry hydration heat release, hydrate decomposition, and heat transfer between hydrate layer, overlying and underlying strata on temperature distribution of the hydrate layer, overlying and underlying strata. Using MATLAB language programming, the partial differential equations were solved by the difference method, and numerical simulations were carried out through simulated wells. The temperature distribution of drilling fluid, cement slurry, hydrate layer and strata during the deep-water cementing process is calculated. Through analysis, the following conclusions are obtained: 1. The cement hydration in the cementing process generates a lot of heat, which severely destroys the stable temperature and pressure conditions of the hydrate layer and causes a large amount of decomposition of the hydrate; 2. The decomposition of hydrate is a long-term process comparing with the cement hydration process. Therefore, the decomposition of hydrate during the cementing operation and for a period of time after completion will bring safety threats to the drilling and completion operations; 3. Considering the heat transfer between hydrate layer, overlying and underlying strata is more accurate to reflect the temperature change of the hydrate layer during the cementing process than only considering the heat exchange between the cement column and the hydrate layer; 4. Reducing the volume of the annulus between the conductor casing and the surface casing can effectively reduce the heat of hydration of the cement slurry, which is beneficial in order to reduce the impact of hydrate decomposition, so it is recommended to use a casing combination with a smaller annulus in the cementing through the hydrate layer. The models studied in this paper can more accurately predict the deep-water cementing temperature field of hydrate layers, provide safety guidance for cementing design in deep-water hydrate layer cementing operations, and lay a foundation for deep-water drilling stability studies.
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Reports on the topic "Wellbore heat exchanger"

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G. Michael Shook, Gopi Nalla, Gregory L. Mines, and K. Kit Bloomfield. Parametric Sensivity Study of Operating and Design Variables in Wellbore Heat Exchangers. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/910645.

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Nalla, G., G. M. Shook, G. L. Mines, and K. K. Bloomfield. Parametric Sensitivity Study of Operating and Design Variables in Wellbore Heat Exchangers. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/893479.

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Journal articles
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