The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Maria José Jurado - One of the best experts on this subject based on the ideXlab platform.
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Evidence for the multi-stage formation of the south-western Valencia Trough
Marine and Petroleum Geology, 1995Co-Authors: M. Ferna`ndez, J.p. Foucher, Maria José JuradoAbstract:A basin evolution model for the south-western Valencia Trough is established using thermal and palaeo-thermal data. Bottomhole Temperature and drillstem test data from oil wells have been used to determine the geothermal gradient in the study area. A combination of well log data and X-ray diffractometry analyses carried out on rock samples from the Ibiza Marino well has allowed an estimation of the bulk thermal conductivity and heat flow density. Integrating these data with previous seafloor heat flow measurements yields a regional surface heat flow density of about 90–100 mW m−2. Vitrinite reflectance data available from the Ibiza Marino well have been used as a palaeo-thermal constraint for the proposed tectonic models. Two different modelling approaches are tested: a single rift phase model and a multi-phase formation model. The single rifting phase, which considers different eroded thicknesses, is ruled out as it does not match the observed data. A multi-stage evolution coherent with the geological and geophysical data is proposed and consists of three Mesozoic rifting events, Palaeogene compression (to which erosion of about 5 km of Late Jurassic and Cretaceous sediments is related) and a Neogene rifting event that gave rise to the present day Valencia Trough. Surface heat flow, vitrinite data and eroded thickness are successfully integrated in the proposed model.
M. Ferna`ndez - One of the best experts on this subject based on the ideXlab platform.
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Evidence for the multi-stage formation of the south-western Valencia Trough
Marine and Petroleum Geology, 1995Co-Authors: M. Ferna`ndez, J.p. Foucher, Maria José JuradoAbstract:A basin evolution model for the south-western Valencia Trough is established using thermal and palaeo-thermal data. Bottomhole Temperature and drillstem test data from oil wells have been used to determine the geothermal gradient in the study area. A combination of well log data and X-ray diffractometry analyses carried out on rock samples from the Ibiza Marino well has allowed an estimation of the bulk thermal conductivity and heat flow density. Integrating these data with previous seafloor heat flow measurements yields a regional surface heat flow density of about 90–100 mW m−2. Vitrinite reflectance data available from the Ibiza Marino well have been used as a palaeo-thermal constraint for the proposed tectonic models. Two different modelling approaches are tested: a single rift phase model and a multi-phase formation model. The single rifting phase, which considers different eroded thicknesses, is ruled out as it does not match the observed data. A multi-stage evolution coherent with the geological and geophysical data is proposed and consists of three Mesozoic rifting events, Palaeogene compression (to which erosion of about 5 km of Late Jurassic and Cretaceous sediments is related) and a Neogene rifting event that gave rise to the present day Valencia Trough. Surface heat flow, vitrinite data and eroded thickness are successfully integrated in the proposed model.
J.p. Foucher - One of the best experts on this subject based on the ideXlab platform.
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Evidence for the multi-stage formation of the south-western Valencia Trough
Marine and Petroleum Geology, 1995Co-Authors: M. Ferna`ndez, J.p. Foucher, Maria José JuradoAbstract:A basin evolution model for the south-western Valencia Trough is established using thermal and palaeo-thermal data. Bottomhole Temperature and drillstem test data from oil wells have been used to determine the geothermal gradient in the study area. A combination of well log data and X-ray diffractometry analyses carried out on rock samples from the Ibiza Marino well has allowed an estimation of the bulk thermal conductivity and heat flow density. Integrating these data with previous seafloor heat flow measurements yields a regional surface heat flow density of about 90–100 mW m−2. Vitrinite reflectance data available from the Ibiza Marino well have been used as a palaeo-thermal constraint for the proposed tectonic models. Two different modelling approaches are tested: a single rift phase model and a multi-phase formation model. The single rifting phase, which considers different eroded thicknesses, is ruled out as it does not match the observed data. A multi-stage evolution coherent with the geological and geophysical data is proposed and consists of three Mesozoic rifting events, Palaeogene compression (to which erosion of about 5 km of Late Jurassic and Cretaceous sediments is related) and a Neogene rifting event that gave rise to the present day Valencia Trough. Surface heat flow, vitrinite data and eroded thickness are successfully integrated in the proposed model.
Christian Hermanrud - One of the best experts on this subject based on the ideXlab platform.
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toward a global model for correction of Bottomhole Temperature data progress and limitations
AAPG Bulletin, 2019Co-Authors: Tala Maria Aabo, Christian HermanrudAbstract:Static formation Temperature (SFT) can be estimated from Temperatures measured during wire-line logging (Tm). A large number of correction models for obtaining SFT from Tm have been suggested. Several studies have shown that SFTs yielded by such models are off by an average of 6°C–10°C (43°F–50°F) at burial depths of 1.5–3.5 km (0.9–2.2 mi) and thus have the potential to cause serious issues in thermal and hydrocarbon generation models. This paper explores the causes for erroneous SFT predictions generated from Tm measurements and identifies factors that should be addressed to generate a globally applicable correction model. We also present an improved empirical correction model for Tm data from eight oil and gas fields, located on the Norwegian continental shelf. The new empirical model was designed to give correct average SFT predictions and is applicable to single Tm measurements. It has been validated against Temperatures recorded during drill-stem testing, which closely represent local SFTs. The expression yields improved results compared with other correction models applied to the data set. However, the average error in computed SFT values varies by up to 10°C (18°F) between the investigated hydrocarbon fields. We conclude that these variations result from differences in operational practices such as fluid circulation and drilling velocities. Therefore, current empirical and physical models for SFT prediction from Tm require local calibration. It is also suggested that more accurate compilations and analyses of operational data could lead to improved and more globally applicable models.
Gensheng Li - One of the best experts on this subject based on the ideXlab platform.
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Gas kick simulation in oil-based drilling fluids with the gas solubility effect during high-Temperature and high-pressure well drilling
Applied Thermal Engineering, 2019Co-Authors: Zhengming Xu, Xianzhi Song, Gensheng LiAbstract:Abstract The high solubility of the invaded gas in oil-based drilling fluids and the heat transfer between annulus fluids and the surrounding formation make the accurate prediction and effective control of the Bottomhole pressure (BHP) difficult during deep well drilling. In this study, a transient gas-liquid two-phase flow model considering the gas solubility and heat transfer effects is developed to simulate multiphase flow behaviors after gas kick in oil-based drilling fluids. Finite difference method is adopted to solve the governing equations. Predicted wellbore Temperature and pressure distributions are in good agreement with field data, which indicates the accuracy of this model. Based on the proposed model, the flowing and thermal behaviors of gas and liquid phases in the annulus are compared when the gas solubility effect and the heat transfer effect are incorporated and not incorporated into the model. In the case of this study, without considering the gas solubility effect, the Bottomhole pressure could be underestimated by 4.2% (2.92 M P a ), while the Bottomhole Temperature is overestimated by 3.2% (3.74 °C). Without considering the heat transfer effect, the Bottomhole pressure could be overestimated by 11.4% (7.94 M P a ) under steady flow conditions. Besides, the effects of the reservoir pressure difference, choke pressure, geothermal gradient, and well depth on the wellbore pressure and Temperature distributions are investigated. The results of this study may help field operators to accurately predict and effectively control the Bottomhole pressure after gas kick in oil-based drilling fluids during deep well drilling.
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Comparison of numerical analysis on the downhole flow field for multi-orifice hydrothermal jet drilling technology for geothermal wells
Geothermics, 2017Co-Authors: Xianzhi Song, Gensheng Li, Guodong Ji, Zhaoyu PangAbstract:Abstract Newly developed hydrothermal jet drilling technology has the potential of being economically advantageous over conventional drilling techniques for drilling deep wells in hard formations. By applying coiled tubing techniques and modulating fluid media in the Bottomhole reaction chamber, there can be a high Temperature and high velocity jet striking and conducting heat to break the rock. So far, there has been no specific study on the influence of nozzle structure on the flow field of multiple hydrothermal jets. This paper presents hydrothermal jet models with different numbers of orifices to investigate the features of flow field, carrying capacity, drilling ability and cooling effect. Results show that for two models in the absence of cooling water, the Bottomhole center Temperature and pressure are higher than the two sides under multiple hydrothermal jets conditions. This is similar to the flow pattern for a single jet. Additionally, for the five-orifice nozzle with cooling water injected, the entire high Temperature region is cylindrical. Ambient cooling water envelops the inner hot water. By comparing different models, the five-orifice nozzle model without cooling water shows a circular symmetric distribution of the Bottomhole Temperature. With cooling water injected, the central high Temperature region becomes rectangular, while the margin of the well bottom is cooled by the peripheral cooling water. The bottom rock average Temperature in five-orifice model is lower than for the four-orifice model due to more drastic thermal and kinetic transfer between the hydrothermal jet and the cooling water. The five-orifice nozzle model is better than the four-orifice nozzle model in terms of Bottomhole Temperature, Bottomhole pressure and carrying capacity. Therefore, the five-orifice nozzle should be adopted for hydrothermal jet drilling. It is also feasible to pump down relatively high Temperature cooling water to guarantee the high Temperature downhole environment. Meanwhile, the cooling water pressure should be controlled during the drilling process for better cooling efficiency. All results in this paper are relevant to the parameters design for multi-orifice hydrothermal jet drilling technology.
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numerical analysis on the impact of the flow field of hydrothermal jet drilling for geothermal wells in a confined cooling environment
Geothermics, 2017Co-Authors: Xianzhi Song, Zehao Lv, Gensheng Li, Xiaodong HuAbstract:Abstract Hydrothermal jet technology is a novel drilling method expected to be suitable for the exploitation of deep geothermal resources, in which the rocks are broken coupled by thermal spallation effect with high velocity impact. Because of the high Temperature return fluid, the cooling of the drill string and wellbore is one major problem in hydrothermal jet drilling. This paper presents two cooling configurations in downhole conditions: the lateral configuration and downward configuration. The investigation on the impact of the flow field of the hydrothermal jet in a confined cooling environment is estimated using CFD methods. The influences of jet velocity, jet Temperature, cooling water velocity and standoff distance are analyzed. For both cooling configurations, the impact of the flow field of a hydrothermal jet in downhole conditions is divided into three zones: the jet zone, the return zone and the eddy zone. The hydrothermal jet impinges on the bottom rock, and then returns from the annulus mixed with the cooling water. The Temperature in the jet zone stays constant, while it decreases in the return and the eddy zone. The Temperature around the wellbore is higher due to the return flow of the cooling water. There is a high Bottomhole Temperature region, while the annulus is cooled by the cooling water in the lateral cooling configuration. In addition, the jet velocity, the cooling water velocity and the standoff distance have a large influence on the pressure and Temperature fields, while the jet Temperature has a small influence. For the downward cooling configuration, the length of the potential core of the hydrothermal jet is positively correlated to the maximum axial velocity. Finally, two cooling configurations are compared. The lateral cooling plan is suitable for reaming operation. The lateral cooling configuration is better in the cuttings carrying capacity due to the higher annular return velocity. Results in this paper could guide for parameters design of hydrothermal jet drilling technology.