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Fluid Flow and Materials Strength related to the Wellbore Safety

Submission Deadline: 01 October 2022 (closed)

Guest Editors

Dr. Bo Zhang, CNPC Research Institute of Safety and Environment Technology, China
Dr. Jun Yang, Changzhou Uuniversity, China
Dr. Qing Wang, CNPC Drilling Engineering Research Insitute, China
Dr. Weiqing Chen, King Fahd University of Petroleum and Minerals, Saudi Arabia

Summary

Wellbore safety is an important issue in the development underground energy and carbon underground storage. However, there are many challenges for the wellbore safety. Up to now, many serious accidents have been reported, like Deepwater Horizon blowout and wellbore leakage in Aliso Canyon underground gas storage. These challenges and accidents are all related to fluid flow and materials strength, such as gas invasion, fluid leakage, annular pressure, casing damage and cement integrity failure. Therefore, this special issue aims to present and disseminate the most recent advances in the fluid flow and materials strength related to the wellbore safety. This special issue covers a wide range of topics, including but not limited to:

1.Gas invasion and gas kick in complex formation

2.Casing strength evaluation and failure analysis

3.Cement sheath integrity failure and potential risk

4.Fluid leakage in the wellbore of geothermal energy

5.Cutting movement in long horizontal well

6.Geological risk caused by gas hydrate decomposition

Keywords

Wellbore safety; integrity and leakage; fluid flow; materials strengthen evaluation

Published Papers

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  • Open Access

    ARTICLE

    Wellbore Cleaning Degree and Hydraulic Extension in Shale Oil Horizontal Wells

    Xin Ai, Mian Chen
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.3, pp. 661-670, 2024, DOI:10.32604/fdmp.2023.026819
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract

    The efficient development and exploitation of shale oil depends on long-distance horizontal wells. As the degree of cleaning of the wellbore plays a key role in these processes, in this study, this problem is investigated experimentally by focusing on the dimensionless cuttings bed height. A method is proposed to calculate the horizontal-well hydraulic extension taking into account the influence of the wellbore cleaning degree on the wellbore pressure distribution and assess the effect of a variety of factors such as the bottom hole pressure, the circulating pressure drop, the drilling pump performance and the formation properties. The analysis shows that… More >

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    322

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    177

  • Open Access

    ARTICLE

    A Cementing Technology for Shale Oil Horizontal Wells

    Yudong Tian, Gonghui Liu, Yue Qi, Jun Li, Yan Xi, Wei Lian, Xiaojie Bai, Penglin Liu, Xiaoguang Geng
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.11, pp. 2837-2845, 2023, DOI:10.32604/fdmp.2023.028805
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract Organic rich dark shale of Q Formation can be found in many areas (e.g., in the North of S Basin). The shale target stratum is easy to hydrate and often undergoes spallation. Therefore, centering the casing in the horizontal section of the irregular borehole is relatively difficult. Similarly, achieving a good cement flushing efficiency under complex borehole conditions is a complex task. Through technologies such as centralizer, efficient preflushing, multi-stage flushing and ductile cement slurry, better performances can be achieved. In this study, it is shown that the cementing rate in the DY2H horizontal section is 97.8%, which is more… More >

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    403

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    190

  • Open Access

    ARTICLE

    Prediction of Cuttings-Induced Annular-Pressure Loss in Extended-Reach Wells

    Long Wang, Qingyun Shen, Gui Wang
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.11, pp. 2877-2890, 2023, DOI:10.32604/fdmp.2023.029206
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract Drill cuttings are broken bits of solid material removed from a borehole drilled by rotary, percussion, or auger methods and brought to the surface in the drilling mud. When these cuttings enter the annulus, they have an effect on the drilling fluid rheology and density, which is, in general, quite difficult to evaluate. By introducing an empirical correlation for the rheological properties of cuttings-laden drilling fluids, this study proposes a pressure-loss prediction method for an extended-reach well (ERW). After verifying the accuracy of this method, a case study is considered and a sensitivity analysis is conducted assuming a yield-power law… More >

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    424

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    237

  • Open Access

    ARTICLE

    An Artificial Intelligence Algorithm for the Real-Time Early Detection of Sticking Phenomena in Horizontal Shale Gas Wells

    Qing Wang, Haige Wang, Hongchun Huang, Lubin Zhuo, Guodong Ji
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.10, pp. 2569-2578, 2023, DOI:10.32604/fdmp.2023.025349
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract Sticking is the most serious cause of failure in complex drilling operations. In the present work a novel “early warning” method based on an artificial intelligence algorithm is proposed to overcome some of the known problems associated with existing sticking-identification technologies. The method is tested against a practical case study (Southern Sichuan shale gas drilling operations). It is shown that the twelve sets of sticking fault diagnostic results obtained from a simulation are all consistent with the actual downhole state; furthermore, the results from four groups of verification samples are also consistent with the actual downhole state. This shows that… More >

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    520

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    304

  • Open Access

    ARTICLE

    A Three-Dimensional Model for the Formation Pressure in Wellbores under Uncertainty

    Jiawei Zhang, Qing Wang, Hongchun Huang, Haige Wang, Guodong Ji, Meng Cui, Hongyuan Zhang
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.9, pp. 2305-2314, 2023, DOI:10.32604/fdmp.2023.026304
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract Formation pressure is the key parameter for the analysis of wellbore safety. With increasing drilling depth, however, the behavior of this variable becomes increasingly complex. In this work, a 3D model of the formation pressure under uncertainty is presented. Moreover a relevant algorithm is elaborated. First, the logging data of regional key drilling wells are collected and a one-dimensional formation pressure profile along the well depth is determined. Then, a 3D model of regional formation pressure of the hierarchical group layer is defined by using the Kriging interpolation algorithm relying on a support vector machine (SVM) and the formation pressure… More >

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    409

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    332

  • Open Access

    ARTICLE

    Mechanical Analysis of a Multi-Test String in High-Temperature and High-Pressure Deep Wells

    Zubing Tang
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.8, pp. 2161-2170, 2023, DOI:10.32604/fdmp.2023.026608
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract The mechanical behavior of the test string in deep wells is generally relatively complex as a result of the high temperature and high pressure, severe dogleg and buckling effects, which in some circumstances can even lead to string failure. Traditional computational methods for the analysis of these behaviors are often inaccurate. For this reason, here a more accurate mechanical model of the test string is introduced by considering variables such as temperature, pressure, wellbore trajectory, and buckling, as well as combining them with the deformation and string constraint conditions brought in by changes in temperature and pressure during the tripping,… More >

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    538

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    338

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    1

  • Open Access

    ARTICLE

    An Auxiliary Monitoring Method for Well Killing Based on Statistical Data

    Shuang Liang, Fangyu Luo, Huihui Yu, Jian Gao, Xiaolin Shu
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.8, pp. 2109-2118, 2023, DOI:10.32604/fdmp.2023.025342
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract In the present study, a large set of data related to well killing is considered. Through a complete exploration of the whole process leading to well-killing, various factors affecting such a process are screened and sorted, and a correlation model is built accordingly in order to introduce an auxiliary method for well-killing monitoring based on statistical information. The available data show obvious differences due to the diverse control parameters related to different well-killing methods. Nevertheless, it is shown that a precise three-fold relationship exists between the reservoir parameters, the elapsed time and the effectiveness of the considered well-killing strategy. The… More >

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    489

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    391

  • Open Access

    ARTICLE

    Interaction of Foam and Microemulsion Components in Low-Tension-Gas Flooding

    Jing Zhao, Jun Yang
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.7, pp. 1951-1961, 2023, DOI:10.32604/fdmp.2023.026115
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract Low-Tension-Foam (LTF) flooding is an emerging enhanced oil recovery technique for low-permeability carbonate reservoirs. Foam capacity is closely related to the salinity environment (or, equivalently, the phase behavior of the oil/water/surfactant system). Therefore, the interactions between microemulsion and foam components are of primary importance in the LTF process. In this study, the phase behavior of an oil/water/surfactant system under equilibrium is analyzed, firstly by assuming perfect mixing. Meanwhile, the formation kinetics of microemulsion are monitored through a novel low-field NMR technique, which is able to provide quantitative assessment on the microemulsion evolution characteristics. Then, foam stability is examined in the… More >

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    595

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    385

  • Open Access

    ARTICLE

    Hydrophobic Small-Molecule Polymers as High-Temperature-Resistant Inhibitors in Water-Based Drilling Fluids

    Xuyang Yao, Kecheng Liu, Zenan Zhou, Jun Zhou, Xianbin Huang, Tiemei Lu, Yongsheng Yu, He Li
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.7, pp. 1775-1787, 2023, DOI:10.32604/fdmp.2023.025843
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract Water-based drilling fluids can cause hydration of the wellbore rocks, thereby leading to instability. This study aimed to synthesize a hydrophobic small-molecule polymer (HLMP) as an inhibitor to suppress mud shale hydration. An infrared spectral method and a thermogravimetric technique were used to characterize the chemical composition of the HLMP and evaluate its heat stability. Experiments were conducted to measure the linear swelling, rolling recovery rate, and bentonite inhibition rate and evaluate accordingly the inhibition performance of the HLMP. Moreover, the HLMP was characterized through measurements of the zeta potential, particle size distribution, contact angles, and interlayer space testing. As… More >

    Graphic Abstract

    Hydrophobic Small-Molecule Polymers as High-Temperature-Resistant Inhibitors in Water-Based Drilling Fluids

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    350

  • Open Access

    ARTICLE

    A Model for the Determination of Semi-Circular Spot Corrosion Damage and Residual Strength in Oil Pipes

    Hongtao Liu, Maoxian Xiong, Bo Zhang, Junfeng Xie, Jinrui Deng, MifengZhao, Ruijing Jiang, Yushan Zheng
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.6, pp. 1709-1720, 2023, DOI:10.32604/fdmp.2023.025513
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract Pitting corrosion often occurs due to the presence of various corrosive substances, such as CO2 and H2S, in the pipe service environment. As a result of this process, the residual strength of oil pipes is reduced and this can compromise the integrity of the entire pipe string. In the present work, a model is introduced on the basis of the API579 standard to determine the so-called stress concentration coefficient. The model accounts for pitting corrosion shapes such as shallow semi-circles, semi-circles, and deep semi-circles. The relationship between the corrosion pit depth and opening diameter and the residual strength of the… More >

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    812

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    371

  • Open Access

    ARTICLE

    Analysis of the Lost Circulation Problem

    Xingquan Zhang, Renjun Xie, Kuan Liu, Yating Li, Yuqiang Xu
    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.6, pp. 1721-1733, 2023, DOI:10.32604/fdmp.2023.025578
    （This article belongs to the Special Issue: Fluid Flow and Materials Strength related to the Wellbore Safety)
    Abstract The well-known “lost circulation” problem refers to the uncontrolled flow of whole mud into a formation. In order to address the problem related to the paucity of available data, in the present study, a model is introduced for the lost-circulation risk sample profile of a drilled well. The model is built taking into account effective data (the Block L). Then, using a three-dimensional geological modeling software, relying on the variation function and sequential Gaussian simulation method, a three-dimensional block lost-circulation risk model is introduced able to provide relevant information for regional analyses. More >

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    753

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    543

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