A New Hydraulics Model for Slim Hole Drilling Applications

Hansen, Svein; Rommetveit, Rolv; Sterri, N.; Aas, Bjarne; Merlo, Antonino

doi:10.2118/57579-ms

Cited by 21 publications

(5 citation statements)

References 16 publications

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“…It should be noted that the eccentricity and rotation of the drill string are two factors that cannot be ignored in the calculation of the annular pressure drop in HW-SH, 33,34 and therefore, the calculation method of the friction pressure drop based on the conventional pipe model is no longer applicable. Here, correction factors of pressure k 1 and k 2 were added to the model to calculate the annular pressure loss of HW-SH more accurately.…”

Section: Shear Stresses For Each Layermentioning

confidence: 99%

Transient cutting transport model for horizontal wells with a slim hole

Huang

et al. 2022

Energy Science & Engineering

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Compared with conventional drilling methods, the method of drilling horizontal wells with a slim hole (HW‐SH) has advantages, such as high productivity, environment‐friendliness, and low costs. However, during the drilling process, the narrow annulus may become blocked, which may lead to an increase in the annulus pressure if the wellbore is not clean. This often leads to serious drilling accidents, such as sticking and leaking formations. Many models have been used to study the cutting transport law in an annulus, but the influence of drill‐pipe rotation on cutting transport is often ignored and weakened in these models. None of the existing models can effectively simulate the cutting transport law of an entire well section. Therefore, using these models to predict the cutting transport law in the annulus of the HW‐SH will cause significant errors. In this study, the authors first establish a pipeline model of the same size as the on‐site annulus using computational fluid dynamics (CFD). Subsequently, a one‐dimensional (1D) two‐layer model that uses three correction factors to express the influence of drill‐pipe rotation on cutting transport and annulus pressure loss is developed. Finally, the parameters in the 1D model are calibrated using the CFD simulation results to accurately predict the cutting transport behavior and annular pressure loss. From the calculation results of the annulus cutting quality, annulus section‐cutting concentration, and annulus pressure drop, it was observed that the two algorithms proposed in this study have a high degree of coincidence, thereby confirming the reliability of the model. The 1D model provides close to three‐dimensional (3D) accuracy at a much shorter central processing unit time than the 3D CFD models. In addition, the accuracy of the developed model was verified using the results of an indoor pipeline two‐phase flow experiment conducted at the University of Tulsa, without considering the rotation of the drill pipe.

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Section: Shear Stresses For Each Layermentioning

confidence: 99%

Transient cutting transport model for horizontal wells with a slim hole

Huang

et al. 2022

Energy Science & Engineering

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“…pi pi po po pi po pi dp (14) For the area inside the drill column, the heat sources were fluid axial heat transfer, frictional heat generation, and heat transfer from the outer to the inner wall of the drill column. The increment in the fluid axial heat transfer ∆t is…”

Section: Assumptionsmentioning

confidence: 99%

“…In addition to considering the drilling column rotation, he also considered the effect of the eccentricity of the drilling column and the variability of its eccentricity along the wellbore axial direction on the annular pressure dissipation and developed a new model for the annular pressure dissipation in HW‐SH. Hansen 14 concluded that the mud type plays an important role in predicting HW‐SH annular pressure depletion and proposed a model for calculating HW‐SH annular pressure depletion for Newtonian, Bingham, and power‐law fluids. However, the calculation process is complicated and cumbersome and cannot be extended to other applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of temperature–pressure coupling model for the horizontal well with a slim hole

Huang

et al. 2022

Energy Science & Engineering

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Horizontal wells with a slim hole (HW-SH), characterized by high productivity, high environmental protection, and low cost are gradually being introduced into oil and gas extraction processes in high-temperature and high-pressure formations. However, the HW-SH annulus is narrow, and the distributions of temperature and pressure in the wellbore are very different from those of conventional horizontal wells. Furthermore, the mud properties change under the influence of high temperature and pressure. In this study, a numerical model of the transient temperaturepressure coupling field in an HW-SH wellbore was developed based on high-temperature and high-pressure performance tests of mud, combined with the characteristics of a narrow annulus in HW-SH. Subsequently, the effects of the ground temperature gradient, displacement, drill pipe speed, annulus size, and joint size on the temperature-pressure coupling field were analyzed. Measured data from the HW-SH drilled in the Mahu field in China were used to validate the developed model. The results showed that the ground temperature had a significant effect on the mud density and rheological properties. As the temperature increased, the mud density decreased, and its rheological properties improved. Although pressure also has a large effect on density, it has a negligible effect on the rheological properties of the mud. The coupled temperature-pressure field model for HW-SH considering the effects of the temperature and narrow annulus can predict the annulus temperature and pressure with an accuracy of up to 97%. The ground temperature gradient has the greatest influence on the HW-SH annular temperature, larger than that of the displacement. In addition, the annular size, rotation speed of the drill pipe, and joint size have almost no influence on the annular temperature. Compared to those of conventional horizontal wells, the rotational speed, annulus size, and joint size of the HW-SH have a greater impact on the annulus pressure.

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“…Specifically, Haciislamoglu and Cartalos [13] provided the corresponding prediction models of the pressure losses for the laminar flow, transition flow, and turbulent flow. Starting from analysis of the friction factor, Hansen et al [14] established the theoretical model about the frictional pressure loss for different flow regimes. Hashemian et al [15] proposed a prediction model for the frictional pressure loss of the Yield-Power-Law fluid flowing in the annular region.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Cementing ECD for Well Annuli with Narrow or Varied Radial Sizes

Liao

Wang

et al. 2023

Geofluids

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In this present work, cement slurry flowing in well annuli with narrow or varied radial sizes is investigated, whose purpose is to precisely calculate the equivalent circulating density (ECD) during well cementing in the petroleum industry. The theoretical Metzner-Reed (MR) method and the direct numerical simulation (DNS) are applied to calculate the cementing ECD for different types of cement slurries by considering both the Bingham and Power-Law rheological models. The cementing ECD calculated by the theoretical MR method is verified to be in accordance with the DNS result. Moreover, for the narrow annulus, the cementing ECD is demonstrated to be sensitive to the rheological model. In addition, based on the obtained DNS results, the accuracies of the cementing ECD calculated by three commercial software, including DRILL BENCH (DB), LANDMARK (LM), and PVI, are compared, to determine their corresponding adaptability for different rheological models. According to the detailed comparisons, LM shows the highest accuracy in calculating the cementing ECD for the Power-Law fluid, while PVI is optimal for the Bingham fluid. However, sharp fluctuations of the calculation errors are observed when DB is applied.

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A New Hydraulics Model for Slim Hole Drilling Applications

Cited by 21 publications

References 16 publications

Transient cutting transport model for horizontal wells with a slim hole

Transient cutting transport model for horizontal wells with a slim hole

Numerical study of temperature–pressure coupling model for the horizontal well with a slim hole

Calculation of Cementing ECD for Well Annuli with Narrow or Varied Radial Sizes

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