Results 21 to 30 of about 1,256 (185)
Study on Distribution of Wellbore Temperature in Gas Drilling with Gradient Equations
Geofluids, Volume 2021, Issue 1, 2021., 2021 Precise calculation of gas temperature profile is the key to gas drilling design. It is traditionally assumed that the gas temperature distribution in the wellbore is equal to the formation temperature, without considering the influence of fluid flow and Joule‐Thomson cooling effect.
Zhongxi Zhu +4 more
wiley +1 more source
Finite Element Modeling of Drillstrings [PDF]
Mathematical and Computational Applications, 1996 A finite element model is presented for investigating dynamic behavior of drillstrings used in oil and gas wells. A Timoshenko beam element is used to model axial and transverse vibrations. The effect of axial load, gravity, the constraints due to stabilizers are considered.
Yigit, A., Al-Ansary, M., Khalid, M.
openaire +2 more sources
Experimental Study on Axial Impact Mitigating Stick‐Slip Vibration with a PDC Bit
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 Stick‐slip vibration reduces the drilling rate of penetration, causes early wear of bits, and threatens the safety of downhole tools. Therefore, it is necessary to study suppression methods of stick‐slip vibration to achieve efficient and safe drilling.
Yong Wang +8 more
wiley +1 more source
Mechanical Analysis of DS in Horizontal Directional Drilling
Applied Sciences, 2022 In recent years, trenchless horizontal directional drilling (HDD) technology has developed rapidly towards the direction of large pipe diameter and long span. During construction, the buckling deformation and large drag torque of the drillstring (DS) are
Hua Tong, Yongbo Shao
doaj +1 more source
Fractional-order controllers for stick-slip vibration mitigation in oil well drill-strings
Journal of Low Frequency Noise, Vibration and Active Control, 2021 Drillstring–borehole interaction can produce severely damaging vibrations. An example is stick–slip vibration, which negatively affects drilling performance, tool integrity and completion time, and costs.
Massinissa Derbal +4 more
doaj +1 more source
Spectral Analysis of the Infinite-Dimensional Sonic Drillstring Dynamics
Mathematics, 2023 By deploying sonic drilling for soil structure fracturing in the presence of consolidated/ unconsolidated formations, this technique greatly reduces the friction on the drillstring and bit by using energetic resonance, a bit-bouncing high-frequency axial
Kaïs Ammari, Lotfi Beji
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Characteristics of Metal Magnetic Memory Testing of 35CrMo Steel during Fatigue Loading
Metals, 2018 The fatigue fracture of a drillstring could cause drilling disturbances and some negative impacts (e.g., economic loss) will be brought when restoring the drillstring to functionality.
Zhibin Hu +4 more
doaj +1 more source
Journal of Earth Energy Engineering, 2021 Drillstrings often vibrate severely and tend to twist off during hard rock drilling. Therefore, dynamic testing is crucial in the design of drilling systems. Designers tend to employ the most powerful analytical tools, using the most elaborate electronic
Mejbahul Sarker
doaj +1 more source
Nonlinear Dynamics in Drilling Engineering
, 2021 Shock and Vibration, Volume 2021, Issue 1, 2021.
Qilong Xue +3 more
wiley +1 more source
Reduced basis method for managed pressure drilling based on a model with local nonlinearities
International Journal for Numerical Methods in Engineering, Volume 121, Issue 23, Page 5178-5199, 15 December 2020., 2020 Abstract To circumvent restrictions of conventional drilling methods, such as slow control actions and inability to drill depleted reservoirs, a drilling method called managed pressure drilling (MPD) has been developed. In MPD, single‐phase flow processes can be modeled as a feedback interconnection of a high‐order linear system and a low‐order ...
Mohammad Hossein Abbasi +4 more
wiley +1 more source