Formation heating by steam circulation in a horizontal wellbore

Emami-Meybodi, Hamid; Saripalli, Hari K.

doi:10.1016/j.ijheatmasstransfer.2014.07.063

Cited by 16 publications

(3 citation statements)

References 12 publications

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“…The approximation resides in the fact that the original condition of constant concentration along the top of region 2 is only satisfied as a spatial average, and not pointwise. A similar mathematical technique has been used for mixed boundary conditions [ Chang and Chen , ; Emami‐Meybodi et al ., ]. Thus, we defined a new boundary condition as

\frac{\partial C_{2} true(η, 0, τ true)}{\partial ξ} = - \frac{H}{D ϕ c^{*}} \bar{j} true(t true) = - \frac{J true(τ true)}{R},

where J is the nondimensional form of total rate of dissolution that varies only with time and

\bar{j} (t)

(kg.m −2 .s −1 ) is the time‐dependent dimensional dissolution flux at z = 0.…”

Section: Analytical Approachmentioning

confidence: 99%

CO₂ dissolution in the presence of background flow of deep saline aquifers

Emami-Meybodi

Ennis‐King

2015

Water Resources Research

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We study the effect of background flow on the dissolution and transport of carbon dioxide (CO 2 ) during geological storage in saline aquifers, and include the processes of diffusion, advection, and free convection. We develop a semianalytical model that captures the evolution of the dissolution in the absence of free convection. Using the semianalytical solution, we determine scaling relations for the steady rate of dissolution that follow either J st $ ffiffiffiffiffiffiffiffi Pe R p or J st $ Pe depending on the value of Pe/R, where R represents the ratio of the extent of CO 2 plume to the aquifer thickness and Pe is the Peclet number. Using direct numerical simulations, we provide detailed behavior of the convective mixing during the dissolution. We establish the criteria for forced and mixed (combined free and forced) convection in aquifers that is governed by the background flow. Accordingly, we provide the scaling relations J st $ ffiffiffiffiffiffiffiffi Pe R p and J st $ Ra R representing the forced and free convection asymptotes, respectively, where Ra is a Rayleigh number based on aquifer thickness. The results reveal that the background velocity can delay the onset of free convection and can alter the subsequent mixing. This phenomenon is more profound in the systems subject to strong background flows wherein horizontal component of the velocity field generated by background flow hinders the establishments of vertical component of the velocity field. Finally, by applying the proposed relations to several potential storage sites, we demonstrate the screening process in finding aquifers where the background flow exerts an important influence on the dissolution.

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\frac{\partial C_{2} true(η, 0, τ true)}{\partial ξ} = - \frac{H}{D ϕ c^{*}} \bar{j} true(t true) = - \frac{J true(τ true)}{R},

where J is the nondimensional form of total rate of dissolution that varies only with time and

\bar{j} (t)

(kg.m −2 .s −1 ) is the time‐dependent dimensional dissolution flux at z = 0.…”

Section: Analytical Approachmentioning

confidence: 99%

CO₂ dissolution in the presence of background flow of deep saline aquifers

Emami-Meybodi

Ennis‐King

2015

Water Resources Research

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“…Numerical modeling has been widely recognized as an effective and less expensive method to investigate heat exchange processes in each region of a well. To obtain complete transient solutions for such cases, numerical approaches, coupled with a superior mathematical algorithm, have been extensively used to predict the wellbore temperature and estimate the initial formation temperature to apply different operating conditions [19,[31][32][33][34][35][36][37]. Emami-Meybodi et al using Laplace transform and finite Fourier cosine transform, developed a two-dimensional transient heat conduction model in the near wellbore region during the steam circulation stage.…”

mentioning

confidence: 99%

“…Emami-Meybodi et al using Laplace transform and finite Fourier cosine transform, developed a two-dimensional transient heat conduction model in the near wellbore region during the steam circulation stage. Steam injection was not suited to extremely low injectivity of the reservoir; to reduce the viscosity of heavy oil, the formation required preheating before steam injection [33]. Espinosa-Paredes et al…”

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confidence: 99%

Determination of transient temperature distribution inside a wellbore considering drill string assembly and casing program

Yang

Zhang

Meng

et al. 2017

Applied Thermal Engineering

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Heat exchange efficiency between each region of the wellbore and formation systems is influenced by the high thermal conductivity of the drill string and casing, which further affects temperature distribution of the wellbore. Based on the energy conservation principle, the Modified Raymond), Simplified and Full-scale models were developed, which were solved by the fully implicit finite difference method. The results indicated that wellbore and formation temperatures were significantly influenced at the connection points between the drill collar and drill pipe, as well as the casing shoe. Apart from the near surface, little change was observed in temperature distribution in the cement section. In the open-hole section, the temperature rapidly decreased in the circulation stage and gradually increased in the shut-in stage. Most important, the simulated result from the full-scale model coincided with the measured field data better than the other numerical models. These findings not only confirm the effect of the drill string assembly and casing programs on the wellbore and formation temperature distribution, but also contribute to resource exploration, drilling safety and reduced drilling costs.

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An integrated model for productivity prediction of cyclic steam stimulation with horizontal well

Fan

et al. 2019

Energy Science & Engineering

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As the accurate productivity prediction of cyclic steam stimulation with horizontal well (CSSHW) is essential for its effective utilization in heavy oil reservoirs, a novel integrated model for predicting productivity of CSSHW was proposed in this paper. Firstly, governing equations to predict thermophysical parameters of injected steam in the horizontal well were established. On the basis, the heating model for radius of hot fluid zone and steam zone were derived respectively according to a more realistic temperature distribution of formation. Then, coupled with heating model, the productivity prediction model was established according to the principle of equivalent percolation resistance. Then, comparisons have been made among the new model results, CMG STARS results, and measured data to verify its accuracy. Finally, after the new proposed model is validated, the effects of steam quality and injection rate on heating radius and oil production were analyzed in detail. The results indicate that the result of new model is in good agreement with that of CMG STARS and measured data, verifying the correctness of the model. In addition, the radius of hot fluid zone and steam zone both decreases with horizontal well length because of the heat losses as the steam flows along the horizontal wellbore. Influential factor analysis shows that high steam quality and steam injection rate can improve heating radius and cumulative oil production.

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Formation heating by steam circulation in a horizontal wellbore

Cited by 16 publications

References 12 publications

CO₂ dissolution in the presence of background flow of deep saline aquifers

CO₂ dissolution in the presence of background flow of deep saline aquifers

Determination of transient temperature distribution inside a wellbore considering drill string assembly and casing program

An integrated model for productivity prediction of cyclic steam stimulation with horizontal well

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Formation heating by steam circulation in a horizontal wellbore

Cited by 16 publications

References 12 publications

CO2 dissolution in the presence of background flow of deep saline aquifers

CO2 dissolution in the presence of background flow of deep saline aquifers

Determination of transient temperature distribution inside a wellbore considering drill string assembly and casing program

An integrated model for productivity prediction of cyclic steam stimulation with horizontal well

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CO₂ dissolution in the presence of background flow of deep saline aquifers

CO₂ dissolution in the presence of background flow of deep saline aquifers