Estimating the initial-formation temperature and flowing-temperature gradient with transient-temperature analysis: Applications in gas reservoirs

Saedi, A.Q. Al; Flori, Ralph E.; Kabir, C.S.

doi:10.1016/j.jngse.2019.03.008

Cited by 12 publications

(7 citation statements)

References 8 publications

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“…Similarly, the heat-transfer model provides the temperature response related to fluid influx along the wellbore in production logging, leading to zonal contributions ascertained with a heat-transfer model. Subsequent studies of Wang et al [52], Kabir et al [49], and Al Saedi et al [53] are cases in point.…”

Section: Establishing Flowing and Static Temperature Gradientsmentioning

confidence: 89%

See 1 more Smart Citation

A Review of Practical Applications of Fluid Flow and Associated Heat Transfer Modeling in Wellbores

Kabir¹

2023

J Energ Power Technol

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Investigations on two-phase gas/liquid flow in pipes have been under study for nearly six decades. These studies have significantly assisted in managing fluid flow in the wellbore and surface networks, leading to the separation of phases and transmission of oil and gas into the market. This study summarizes some of the main lessons learned in flow through wellbores. Besides understanding some of the fundamental principles, we focused on the practical items of interest: Conventional production scenarios for oil and gas wells; Liquid loading in gas wells; Production in geothermal wells; Heat flow from fluid flow; Transient non-isothermal wellbore modeling; Well blowout in drilling operation; Estimating static geothermal and flowing-temperature gradients in gas wells; Heat mining with fluid circulation in wellbores. Given the diversity of the methods mentioned above, understanding flows in the wellbore and the reservoir becomes equally important. One critical item is the fluid temperature measurement associated with the fluid flow that enables validation of the fluid flow rate, besides revealing information about the reservoir characteristics.

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Section: Establishing Flowing and Static Temperature Gradientsmentioning

confidence: 89%

“…In a follow-up study, Al Saedi et al [53] offered a new methodology for estimating the geothermal gradient from three shut-in tests. They showed that invoking the superposition principle could establish a reliable geothermal gradient.…”

Section: Figure 41mentioning

confidence: 99%

A Review of Practical Applications of Fluid Flow and Associated Heat Transfer Modeling in Wellbores

Kabir¹

2023

J Energ Power Technol

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“…The higher the flow rate, the smaller the interlayer shear stress. The lowest interlayer resistance corresponds to the position with the maximum velocity. − When two fluids with different properties are replaced, the shear stress of the displaced fluid is the driving force that causes the fluid to flow. At the interface of the fluid contact, the closer the fluid is to the outer layer, the greater the shear stress. − …”

Section: Introductionmentioning

confidence: 99%

Research on Key Technologies to Improve Cementing Displacement Efficiency

Wang

Xiong

et al. 2022

ACS Omega

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The annulus has a wide and narrow clearance due to casing eccentricity in the cementing process and due to the eccentricity of casing in the process of cementing. Because the flow resistance of the drilling fluid in the wide gap is less than that in the narrow gap, the phenomena of a delayed flow or even an overall nonflow occurs in the narrow gap. Based on the existing displacement efficiency calculation model, this paper establishes the cementing displacement efficiency model under the condition of oil-based drilling fluid, explores the residual layer thickness of drilling fluid on the casing side and the sidewall side, and then links the annular displacement efficiency to the injection displacement in combination with the circulating mode resistance pressure drop formula so as to explore the change in the cementing displacement efficiency under different displacements. Considering the change in the physical parameters of annulus fluid, the change in annulus displacement efficiency is obtained. On this basis, the relationship between the wellhead cement injection flow and the annulus retention layer is studied; then, the displacement is calculated. The reasonable cementing displacement is calculated by combining the displacement with annulus displacement efficiency. The results show that the thickness of the annular detention layer increases with the increase in the casing eccentricity in the same well depth, and the growth rate of the detention layer on the wellbore side is greater than that on the casing side at the same circumferential angle. The greater the displacement, the greater the annular circulation pressure drop and circulation equivalent density, thus increasing the cementing risk. The displacement is reasonably designed. The research results in this paper have a certain guiding significance for improving the displacement rate of isolation fluid under oil-based drilling fluid conditions.

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“…An oil-based drilling fluid has many advantages, such as strong antipollution ability, strong inhibition, stable performance, and adaptability to high temperature and high pressure and other complex formations, but it also brings challenges for later operations. In the cementing stage, it is required to ensure good first and second interface cementation quality to achieve the ideal cementing quality, while the existence of the oil-based drilling fluid will greatly affect the cementation strength of the wall and the cement slurry or even not. − Therefore, it is necessary to clean the oil-based drilling fluid on the well wall and change the wettability of the wall from oil-wet to water-wet before water injection, − which is an important premise to ensure the cementing quality, and this is the problem that the oil-based mud prepositional fluid should focus on. However, how to determine the flushing effect of preflush on the well wall and the wall wettability after flushing before mud injection is a subject that has been studied. − …”

Section: Introductionmentioning

confidence: 99%

Evaluation of Flushing Ability of Cementing Flushing Fluids

Wang

Xiong

et al. 2021

ACS Omega

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During cementing operation with oil-based drilling fluids, the casing and well wall are in the "oil wet" environment, and the cement slurry cannot achieve good cementation with the second interface, which seriously affects the cementation quality of the cementing interface. Therefore, it is very important to select a flushing fluid with good performance and high flushing efficiency for cementing operation with an oil-based drilling fluid. An integrated measurement system of interface parameters and a rotating liquid interface tension tester is selected in the room. A set of evaluation methods of wetting reversal is developed to evaluate the wetting reversal ability of type A and type-B flushing fluids on site to optimize the reasonable type and concentration of the flushing fluid. The experimental results show that under the same concentration, the surface tension and interfacial tension of type A flushing solution are lower than those of type-B; that is, the hydrophilic effect of type A flushing solution is better than that of type-B. The wettability reduction of type A is better than that of type-B. The wetting reversal ability of type A flushing solution with a surfactant concentration of 30% is better than that of type-B. The evaluation methods include surface tension, interface tension, dewetting ability, and oil washing ability of the flushing fluid, and the evaluation of the wetting reversal ability is carried out on the basis of the sandstone, sheet metal (steel for three open casings on site), and slide glass (as a reference). Then, according to the optimal concentration of the flushing fluid, a mixing experiment of the two kinds of flushing fluids is carried out to evaluate the ability of wetting reversal, and compared with the experimental results of A and B, the reasonable flushing fluid formula is finally selected. A proper analysis of the adaptability of the evaluation method of the flushing fluid is conducive to the reliable evaluation of the performance of the flushing fluid and the enhancement of the operator's ability to grasp the cementing quality. To guide the field practice has a very important practical significance, but it also has a guiding role for the development of new pre-liquid products.

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Estimating the initial-formation temperature and flowing-temperature gradient with transient-temperature analysis: Applications in gas reservoirs

Cited by 12 publications

References 8 publications

A Review of Practical Applications of Fluid Flow and Associated Heat Transfer Modeling in Wellbores

A Review of Practical Applications of Fluid Flow and Associated Heat Transfer Modeling in Wellbores

Research on Key Technologies to Improve Cementing Displacement Efficiency

Evaluation of Flushing Ability of Cementing Flushing Fluids

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