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  • 1
    Online Resource
    Online Resource
    Experimental Study and Prediction Model of Casing Wear in Oil and Gas Wells
    ASME International ; 2016
    In:  Journal of Pressure Vessel Technology Vol. 138, No. 3 ( 2016-06-01)
    Details
    In: Journal of Pressure Vessel Technology, ASME International, Vol. 138, No. 3 ( 2016-06-01)
    Abstract: With the development of drilling technology and reinforced exploration and exploitation of unconventional reservoirs, there has been a great increase of complex wells. Meanwhile, however, consequent casing wear is and will continue to be a serious problem that causes enormous economic losses and many safety issues. The purpose of this paper is to find out the mechanism of casing wear and establish casing wear prediction model. Casing wear experiment was carried out to study the effect of contact force, rotation speed, and casing grade on wear depth. Meanwhile, wear coefficients under different working conditions were obtained through the normalizing of data. With the extensive research of downhole drag and torque calculation method, a contact force calculation model was established. Through the combination of crescent-shaped model and wear-efficiency model, the past complicated casing wear prediction models and confusing empirical formulae were greatly simplified. Therefore, the wear volume and depth of the casing string can be accurately predicted. Finally, a prediction software was developed to predict downhole casing wear of oil and gas wells. Comparison with the field data confirmed that the established model and software had enough accuracy to help predict and analyze casing wear at field.
    Type of Medium: Online Resource
    ISSN: 0094-9930 , 1528-8978
    URL: Article
    DOI: 10.1115/1.4032473
    Language: English
    Publisher: ASME International
    Publication Date: 2016
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  • 2
    Online Resource
    Online Resource
    Failure Mechanism and Flow Field of Choke Manifold in a Natural Gas Well: Computational Fluid Dynamic Simulation
    Springer Science and Business Media LLC ; 2022
    In:  Arabian Journal for Science and Engineering Vol. 47, No. 9 ( 2022-09), p. 12103-12115
    Details
    In: Arabian Journal for Science and Engineering, Springer Science and Business Media LLC, Vol. 47, No. 9 ( 2022-09), p. 12103-12115
    Type of Medium: Online Resource
    ISSN: 2193-567X , 2191-4281
    URL: Article
    DOI: 10.1007/s13369-022-06897-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2471504-9
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    On how asymmetric stimulated rock volume in shales may impact casing integrity
    Wiley ; 2020
    In:  Energy Science & Engineering Vol. 8, No. 5 ( 2020-05), p. 1524-1540
    Details
    In: Energy Science & Engineering, Wiley, Vol. 8, No. 5 ( 2020-05), p. 1524-1540
    Abstract: Microseismic data and production logs in our study area have confirmed asymmetric developments of the stimulation rock volume in shales with respect to the wellbore, while severe casing deformation problems have been reported frequently in this area. Here, we propose a systematic methodology to investigate the possibility of casing failure due to strong shear stresses induced by asymmetric stimulated zones. A mechanical earth modeling (MEM) is initially performed to determine the in situ stress field in the target layer before fracturing by incorporating the existing geological features, logging data, and rock anisotropy. Then, we provide a computationally cheap and efficient estimation for stimulated rock volume of each stage by considering the possible overlaps in adjacent stages based on the clustered microseismic clouds. Using this approach, a reservoir‐scale 3D coupled model tied to a more detailed near‐wellbore part incorporating the casing string and the cement sheath is established to simulate the development of stimulation zones, stress redistribution, and their impacts on casing deformation as each stage fracturing treatment chronologically goes on. Our numerical results indicate that continuous redistribution and re‐orientation of stress field near the borehole are tracked during pumping the treatment which reveals formation of some pockets of tensile stresses along and around the wellbore. Asymmetric stimulations are observed to generate strong shear stress on the suspended casing. These shear forces result in deflection and S‐shape deformations accompanied with cross‐sectional ovality. Some regions receive repeating treatments, which results in intensifying formation stress heterogeneity and worsen casing deformation severity. The calculation results are compared with measurement of multi‐finger imaging tool (MIT) to validate the accuracy. Our analysis has indicated that simply increasing the flexural strength by increasing thickness of casing cannot radically mitigate casing deformation problems. This paper presents a novel workflow for a coupled modeling of casing deformation during hydraulic fracturing operations, while current modeling efforts assume symmetric bi‐wing fracture geometries.
    Type of Medium: Online Resource
    ISSN: 2050-0505 , 2050-0505
    URL: Issue
    URL: Article
    DOI: 10.1002/ese3.v8.5
    DOI: 10.1002/ese3.610
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2720339-6
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  • 4
    Online Resource
    Online Resource
    Finite element analysis of fracture of a ram BOP for deep gas wells
    Elsevier BV ; 2019
    In:  Engineering Failure Analysis Vol. 98 ( 2019-04), p. 109-117
    Details
    In: Engineering Failure Analysis, Elsevier BV, Vol. 98 ( 2019-04), p. 109-117
    Type of Medium: Online Resource
    ISSN: 1350-6307
    URL: Article
    DOI: 10.1016/j.engfailanal.2019.01.083
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2019
    detail.hit.zdb_id: 2021082-6
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  • 5
    Online Resource
    Online Resource
    Experimental and numerical study on casing wear in a directional well under in situ stress for oil and gas drilling
    Elsevier BV ; 2016
    In:  Journal of Natural Gas Science and Engineering Vol. 35 ( 2016-09), p. 986-996
    Details
    In: Journal of Natural Gas Science and Engineering, Elsevier BV, Vol. 35 ( 2016-09), p. 986-996
    Type of Medium: Online Resource
    ISSN: 1875-5100
    URL: Article
    DOI: 10.1016/j.jngse.2016.09.047
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
    detail.hit.zdb_id: 2514802-3
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  • 6
    Online Resource
    Online Resource
    Experimental and numerical study on casing wear in highly deviated drilling for oil and gas
    SAGE Publications ; 2016
    In:  Advances in Mechanical Engineering Vol. 8, No. 7 ( 2016-07), p. 168781401665653-
    Details
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 8, No. 7 ( 2016-07), p. 168781401665653-
    Abstract: Aimed at studying the casing wear in the highly deviated well drilling, the experimental study on the casing wear was carried out in the first place. According to the test data and the linear wear model based on the energy dissipation proposed by White and Dawson, the tool joint–casing wear coefficient was obtained. The finite element model for casing wear mechanism research was established using ABAQUS. The nodal movement of the contact surface was employed to simulate the evolution of the wear depth, exploiting the Umeshmotion user subroutine. In addition, the time-dependent geometry of the contact surfaces between the tool joint and casing was being updated continuously. Consequently, the contact area and contact pressure were changed continuously during the casing wear process, which gives a more realistic simulation. Based on the shapes of worn casing, the numerical simulation research was carried out to determine the remaining collapse strength. Then the change curve of the maximum casing wear depth with time was obtained. Besides, the relationship between the maximum wear depth and remaining collapse strength was established to predict the maximum wear depth and the remaining strength of the casing after a period of accumulative wear, providing a theoretical basis for the safety assessment of worn casing.
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    URL: Article
    DOI: 10.1177/1687814016656535
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 2501620-9
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  • 7
    Online Resource
    Online Resource
    Viscoelastic behavior of a casing material and its utilization in premium connections in high-temperature gas wells
    SAGE Publications ; 2018
    In:  Advances in Mechanical Engineering Vol. 10, No. 12 ( 2018-12), p. 168781401881745-
    Details
    In: Advances in Mechanical Engineering, SAGE Publications, Vol. 10, No. 12 ( 2018-12), p. 168781401881745-
    Abstract: At the high or extra-high temperatures in a natural gas oilfield, where the premium connection is employed by casing, gas leakage in the wellbore is always detected after several years of gas production. As the viscoelastic material’s mechanical properties change with time and temperature, the relaxation of the contact pressure on the connection sealing surface is the main reason for the gas leakage in the high-temperature gas well. In this article, tension-creep experiments were conducted. Furthermore, a constitutive model of the casing material was established by the Prony series method. Moreover, the Prony series’ shift factor was calculated to study the thermo-rheological behavior of the casing material ranging from 120°C to 300°C. A linear viscoelastic model was implemented in ABAQUS, and the simulation results are compared to our experimental data to validate the methodology. Finally, the viscoelastic finite element model is applied to predict the relaxation of contact pressure on the premium connections’ sealing surface versus time under different temperatures. And, the ratio of the design contact pressure and the intending gas sealing pressure is recommended for avoiding the premium connections failure in the high-temperature gas well.
    Type of Medium: Online Resource
    ISSN: 1687-8140 , 1687-8140
    URL: Article
    DOI: 10.1177/1687814018817452
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2501620-9
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  • 8
    Online Resource
    Online Resource
    Study on Fatigue of Tubing Joint Thread Induced by Vibration in HTHP Ultradeep Wells
    ASME International ; 2020
    In:  Journal of Pressure Vessel Technology Vol. 142, No. 3 ( 2020-06-01)
    Details
    In: Journal of Pressure Vessel Technology, ASME International, Vol. 142, No. 3 ( 2020-06-01)
    Abstract: According to the tubing string failure statistics in the oilfield, fatigue crack of tubing joint thread in high temperature high pressure (HTHP) ultradeep gas wells remains a problem because it can cause tubing strength degradation, tubing fracture failure, well workover, and even well abandonment. In order to obtain a better understanding of tubing thread fatigue and quantify the fatigue life of tubing joint thread in HTHP ultradeep wells, experimental study, elastic–plastic mechanical simulation, and multi-axial fatigue calculation are carried out in this paper. Based on the similarity theory, the vibration mechanical testing device of the tubing string is designed, and the multi-axial load of the tubing joint thread in the actual working condition is obtained. Meanwhile, tubing joint BX1 thread model is established with ansys software, and the stress distribution of tubing joint thread is analyzed on the boundary condition acquired from experiments of vibration test of tubing string. Finally, according to the multi-axial fatigue theory, the fatigue life prediction value of the tubing thread made of Super 13Cr110 and Super 15Cr125 is compared and analyzed. The work presented in this paper can provide theoretical method and technological basis for the study on the frequent failure mechanism of tubing joint thread in HTHP ultradeep gas wells.
    Type of Medium: Online Resource
    ISSN: 0094-9930 , 1528-8978
    URL: Article
    DOI: 10.1115/1.4046215
    Language: English
    Publisher: ASME International
    Publication Date: 2020
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  • 9
    Online Resource
    Online Resource
    Evaluation of casing integrity defects considering wear and corrosion – Application to casing design
    Elsevier BV ; 2016
    In:  Journal of Natural Gas Science and Engineering Vol. 29 ( 2016-02), p. 440-452
    Details
    In: Journal of Natural Gas Science and Engineering, Elsevier BV, Vol. 29 ( 2016-02), p. 440-452
    Type of Medium: Online Resource
    ISSN: 1875-5100
    URL: Article
    DOI: 10.1016/j.jngse.2016.01.029
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
    detail.hit.zdb_id: 2514802-3
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  • 10
    Online Resource
    Online Resource
    Numerical simulation of the influence of stimulated reservoir volume on in-situ stress field
    Elsevier BV ; 2016
    In:  Journal of Natural Gas Science and Engineering Vol. 36 ( 2016-11), p. 1228-1238
    Details
    In: Journal of Natural Gas Science and Engineering, Elsevier BV, Vol. 36 ( 2016-11), p. 1228-1238
    Type of Medium: Online Resource
    ISSN: 1875-5100
    URL: Article
    DOI: 10.1016/j.jngse.2016.03.040
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
    detail.hit.zdb_id: 2514802-3
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