Results 141 to 150 of about 1,256 (185)

Investigation on random vibration of a drillstring

Journal of Sound and Vibration, 2017
Abstract This paper investigates the axial-torsional coupled vibration of a drill-string under combined deterministic and random excitations. Finite element method (FEM) is used to model the system. The random excitation at the bit-rock interaction, which is considered in the bit axial direction, is treated as Gaussian white noise.
Hongyuan Qiu, Jianming Yang, Stephen Butt, Jinghan Zhong   +3 more
openaire   +1 more source

Drillstring Vibration and Wellbore Instability

Journal of Energy Resources Technology, 2002
Wellbore instability can be attributed to several causes. The ones thought to be most important include: chemical interaction with the drilling fluid, high tectonic stresses, and insufficient mud weight. Drillstring vibration, although not traditionally addressed as a potential cause, might influence the stability of wellbores drilled in specific ...
Joa˜o Carlos R. Pla´cido, He´lio M. R. Santos, Yadira Diaz Galeano   +2 more
openaire   +1 more source

Intelligent-Drillstring Field Trials

Journal of Petroleum Technology, 2005
This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 92477, "Intelligent Drill String Field Trials Demonstrate Technology Functionality," by M.E. Reeves, SPE, Grant Prideco; M.L. Payne, SPE, and A.G. Ismayilov, SPE, BP plc; and M.J.
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The Genesis of Torsional Drillstring Vibrations

SPE Drilling Engineering, 1992
Summary Inherent drilling characteristics of polycrystalline diamond compact (PDC) bits alone can be sufficient to excite severe torsional drillstring vibrations. The work presented here augments previous findings that torsional vibrations can result from the drilling characteristics of the bit itself.
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Hole enlargement by drillstring stabilizers

Journal of Petroleum Science and Engineering, 2019
Abstract The goal of this study is to quantify the hole enlargement caused by drillstring stabilizers and the relation of this enlargement to the drilling parameters, contact forces, and rock strength. For this purpose, an extensive test campaign was conducted. In each test, a real-size stabilizer is placed within a predrilled hole in a mortar block.
openaire   +1 more source

Analysis of Drillstrings in Curved Boreholes

Fall Meeting of the Society of Petroleum Engineers of AIME, 1974
American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. This paper was prepared for the 49th Annual Fall Meeting of the Society of Petroleum Engineers of AIME, to be held in Houston, Texas, Oct. 6–9, 1974. Permission to copy is restricted to an abstract of not more than 300 words. illustrations may not be copied.
openaire   +1 more source

Measurement and Analysis of Drillstring Dynamics

2019
We shown that drilling dynamics is a crucial problem must be attached great importance to. Our innovation lies in combining actual measurement with theoretical modeling. Two evaluation methods are compared systematically, such as theoretical and measurement methods.
openaire   +1 more source

Bifurcation and chaos in drillstring dynamics

Chaos, Solitons & Fractals, 1993
This paper contains an extensive discussion of the lateral vibrations of a stabilized drillstring as is used in drilling oil wells. The mathematical model leads to a system of two coupled second order ordinary differential equations with periodic forcing terms; using a rotating frame this system is turned into a four-dimensional autonomous system of ...
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Research on the Drillstring Nonlinear Dynamics with Fully Coupled Drillstring-Bit-Rock Model

SSRN Electronic Journal, 2022
liangjie mao, Maoyuan Ma, Mingjie Cai
openaire   +1 more source

Analysis on the nonlinear lateral vibration of drillstring in curved wells with beam finite element

Communications in Nonlinear Science and Numerical Simulation, 2022
Liangjie Mao, Mingjie Cai
exaly