Slim-Well Completions: A 3D Numerical Approach for Displacement to Design Effective Cementing Fluids

Pks, Sairam; Yerubandi, Krishna Babu

doi:10.2523/132480-ms

Cited by 3 publications

(1 citation statement)

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“…Reduction of the overall drilling costs has been mentioned among the most significant issues in the petroleum industry (Brunsman et al, 1994;De Sousa et al, 1999). One of the most reliable methods to attain a considerable decrease in costs is the use of slim-hole drilling (Jafarifar et al, 2020;Pks and Yerubandi, 2010;Scott and Earl, 1961;Cohen et al, 1995).…”

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confidence: 99%

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

Jafarifar

Abbasi

Kiani

2022

Preprint

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In order to have a better control over the drilling process and reduce the overall cost of this drilling operation, engineers have tried to use soft computing (SC) techniques to conduct the pre-estimation of drilling events. It is critically important to estimate the annular pressure losses (APL) for non-Newtonian drilling muds within annulus in order to specify pump rates and also to be able to choose the most appropriate mud pump systems while conducting the drilling operations. To develop the vigorous and exact models to enable the prediction of APL, two popular models were employed, i.e., multilayer perceptron (MLP) [optimized by levenberg-marquardt (LM), bayesian regularization (BR), scaled conjugate gradient (SCG), Resilient back propagation (RB), and broyden fletcher goldfarb shanno (BFGS)] and radial basis function (RBF). Subsequently, applying a committee machine intelligent system (CMIS), the four top models were combined into a unit paradigm. Several tools such as error distribution diagram, cross plot, trend analysis, and cumulative frequency diagram were used in conjunction with statistical calculation to assess the efficiency of models. Consequently, the CMIS model was introduced as the most exact technique which has the greatest coefficient of determination (R2 close to one) as well as the lowest root mean square error (RMSE close to zero) for the tested dataset.

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Section: Introductionmentioning

confidence: 99%

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

Jafarifar

Abbasi

Kiani

2022

Preprint

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Innovative and Modular Equipment Design for Rheology and Compatibility Measurement of Complex Wellbore Fluids

Sairam

Pangu

Gajji

2015

SPE/IADC Drilling Conference and Exhibition

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Accurately measuring the rheology of fluid systems under downhole conditions is recommended for the success of well construction. The rheological fingerprints of fluids and their admixtures deployed downhole during wellbore servicing provide a basis for predicting interfacial fluid movements and associated effects on bottomhole circulating pressures. Rheology measurements can also provide a direct indication of any detrimental physical and/or chemical reactions that might occur when the fluids intermix and/or contaminate one another during and after the placement process. A need has existed for some time within the industry for high-pressure/high-temperature (HP/HT) rheology equipment capable of in-situ fluid transfer to change compositions on-the-fly, and easy to clean and maintain considering the abrasive and settable nature of cementitious fluids. This paper discusses an innovative design developed for a fully automated slurry rheometer capable of dosing contaminant fluids in and out of fluid samples to vary composition, mix homogenously in-situ, and measure compatibility between fluid systems at various volumetric compositions—all while maintaining in-situ wellbore test conditions. The rheometer cell is a four-piece design that houses a novel magnetically coupled double helical rotor with cut flights and intermeshing helical blades on the stator to allow mixing and measuring at the same time while overcoming operational issues, such as wall-slip, particle settling, sample coring, and aid in-situ homogenization. A first of its kind, noncontact, zero friction magneto-resistive torsion measurement module with selectable range capabilities and large separation offset (6 to 8 in.) from moving parts is discussed in addition to its usability on both thick pastes as well as thin fluids. A separate design of a high pressure slurry dosing unit that allows for compatibility measurements is discussed. Operating principles, design concepts, engineering development for modularity, calibration data, and slurry test results are presented.

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Advanced Mud Displacement Modeling for Slim Hole Cementing Operations

Wang,

Lamb,

Ashok

et al. 2024

Energies

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Successful design and execution of slim-hole cementing operations depend on reliable prediction of the annular pressure and the efficiency of mud displacement by cement. A 3D model of the flow inside the casing and in the annulus during mud displacement/cement placement operations was created. The yield-power-law fluid model was used for the rheological behavior of mud, spacers, and cement. Mud displacement was analyzed by splitting the well into multiple sections and analyzing the efficiency of mud removal by spacers and cement, as well as the associated pressure gradients in each section for applicable combinations of pump rate and casing rotation speed. The results from the various computational steps were then integrated to compute the overall pressure and cement placement efficiency during the cementing operation. Using the new 3D model, a field case study was performed for a slim hole casing cementation on an unconventional shale well. The simulated peak surface pressure was only 0.3% lower than the measured data, and the trend of the pressure matched the measured data. This work provides a new tool for the well construction industry to predict and analyze the pressure during complicated cementing operations, thereby enabling safer and more cost-effective operations.

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Slim-Well Completions: A 3D Numerical Approach for Displacement to Design Effective Cementing Fluids

Cited by 3 publications

References 0 publications

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

Application of soft computing approaches for modeling annular pressure loss of slim-hole wells in one of Iranian central oil fields

Innovative and Modular Equipment Design for Rheology and Compatibility Measurement of Complex Wellbore Fluids

Advanced Mud Displacement Modeling for Slim Hole Cementing Operations

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