A Method for Determination of Near-wellbore Zone Properties Alteration during Well Drilling, Completion and Cleanup Operations by Combination of Numerical Simulations and Special Experimental Technique

Polymer coatings are widely used for effective vibration damping of sheet or hull structures of different engineering systems. The article presents a calculation and experimental technique that enables improved accuracy and validity of damping properties determination of polymer coatings. Mathematical models to determine the parameters of the experimental specimen having a homogenous strain state of the polymer coating are obtained. Experimentally confirmed that the use of coatings based on adhesive compositions such as "Sprut" increases by 18...28 times the damping capability in metal structures. An addition of fillers in adhesive compositions "Sprut" type in a proportion of 30...50% of its weight reduces by 2.4 times the damping properties of metal structures.

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Correction to: Determination of the Dependence of Thermal Diffusivity with Moringa Concentration by Thermal Lens as a Sensitive Experimental Technique

International Journal of Thermophysics ◽

10.1007/s10765-020-02705-9 ◽

2020 ◽

Vol 41 (8) ◽

Author(s):

R. Carbajal-Valdéz ◽

J. L. Jiménez-Pérez ◽

G. Gamboa-López ◽

Z. N. Correa-Pacheco ◽

C. Hernández-Aguilar ◽

...

Keyword(s):

Thermal Diffusivity ◽

Experimental Technique ◽

Thermal Lens

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The theory of ionisation measurements in gases at high pressures

Mathematical Proceedings of the Cambridge Philosophical Society ◽

10.1017/s0305004100012421 ◽

1934 ◽

Vol 30 (1) ◽

pp. 80-101 ◽

Cited By ~ 42

Author(s):

D. E. Lea

Keyword(s):

High Pressure ◽

Experimental Determination ◽

Experimental Technique ◽

Alpha Particle ◽

Reasonable Agreement ◽

High Pressures ◽

Industrial Research ◽

Heavy Nuclei ◽

Nuclear Tracks

The columnar theory developed by Jaffé to account for the recombination of ions in alpha particle tracks is extended to beta rays by taking account of the clusters of secondary ionisation. Reasonable agreement is obtained with experiment. Recombination in proton tracks produced in hydrogen by neutrons is shown to be in agreement with the columnar theory, but in the case of nitrogen nuclear tracks in nitrogen the recombination is only a hundredth of that predicted by the theory. An explanation of this effect is advanced, and it is suggested that recombination is likely to be abnormally small for all heavy nuclei of velocities not exceeding 5 × 108 cm. per sec.An experimental determination of the coefficient of recombination of ions in nitrogen and hydrogen at pressures of 20, 40 and 90 atmospheres is reported.My thanks are due to Dr Chadwick for interest in this work, and to Dr Gray and Dr Tarrant for advice on the experimental technique of high pressure ionisation measurements. I am indebted also to the Department of Scientific and Industrial Research for a maintenance grant.

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Numerical Simulation of Offshore Pipeline Installation by Lateral Deflection Procedure

Volume 3: Pipeline and Riser Technology; CFD and VIV ◽

10.1115/omae2007-29703 ◽

2007 ◽

Author(s):

Danilo Machado Lawinscky da Silva ◽

Rodrigo Almeida Bahiense ◽

Breno Pinheriro Jacob ◽

Fernando Gomes da Silva Torres ◽

Antonio Roberto Medeiros ◽

...

Keyword(s):

Numerical Simulation ◽

Numerical Simulations ◽

Computational Tool ◽

Lateral Deflection ◽

Correct Definition ◽

Offshore Pipeline ◽

Definition Of

Conventional offshore pipeline installation operations in Brazil have been performed in an S-Lay procedure employing the BGL-1 barge, owned by Petrobras. However, this procedure has some limits, and may not be feasible in some particular scenarios. Therefore, the objective of this work is to present the numerical simulation of an alternative pipeline installation procedure. This procedure basically consists of performing the pipeline assembly on shore, and deflecting it to the sea using a tug boat. The numerical simulations employ the SITUA-Prosim computational tool, which is able to incorporate the correct definition of the seabed and shore from bathymetric curves. An actual pipeline installation by this lateral deflection procedure is analyzed and discussed. The characterization of the procedure passes through the determination of the better velocity and direction of the tug boat in order to minimize the efforts on the pipeline (especially due to the curvatures).

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