Compressibility Effects On Transient Gas Pipe Flow

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Compressibility Effects On Transient Gas Pipe Flow

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Author : Gerald Francis Mouser
language : en
Publisher:
Release Date : 1971

Compressibility Effects On Transient Gas Pipe Flow written by Gerald Francis Mouser and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Compressibility categories.

"Abstract (1) Methods of iterative solution for the partial-differential equations that govern the transient flow of gases in pipelines are obtained by using the method of characteristics and linear finite-difference techniques. Solutions are developed for 1) a constant gas compressibility factor throughout transient conditions, and 2) a variable gas compressibility factor at constant temperature dependent upon pressures encountered during transient flow. Theoretical studies are made to compare results using both approaches for pipelines operating at various constant flowing temperatures. Results show greater differences between the two methods at lower values of flowing temperature due to the more rapidly changing compressibility factor as a function of variable pressure. Abstract (2) Equations are developed for transient gas pipe flow using both a constant and variable gas compressibility factor. Solution is by characteristics method using linear finite-differences. Results are used to compare the effects of compressibility factor at various constant flowing temperatures"--Abstract, pages ii-iii.

Compressed Gas Handbook

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Author : Samuel D. Wilson
language : en
Publisher:
Release Date : 1969

Compressed Gas Handbook written by Samuel D. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Gas flow categories.

High pressure compressible flow systems in space vehicle ground support equipment.

Consideration Of Compressibility Effects For Applied Back Pressure Dynamic Well Control Response To A Gas Kick In Managed Pressure Drilling

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Author : William Alexander Bacon
language : en
Publisher:
Release Date : 2011

Consideration Of Compressibility Effects For Applied Back Pressure Dynamic Well Control Response To A Gas Kick In Managed Pressure Drilling written by William Alexander Bacon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Managed Pressure Drilling (MPD) operations offer the ability to control a relatively small gas kick dynamically, without shutting in the well using blowout preventers. One currently employed method of dynamic well control uses applied-back-pressure to force flow exiting the wellbore to equal flow entering the drill-pipe, which is taken as an indication that the influx has stopped. However, for flow out equals flow in to imply influx cessation, the assumption of incompressibility of fluid in the wellbore is necessary. When fluid compressibility is appreciable, solely ensuring flow rate continuity does not necessarily imply influx cessation. The period of "dynamic well control" in an MPD operation- from the moment an influx is identified until the moment the influx is believed to have ceased- is examined in this work. A control volume mass balance with compressibility is used to analyze the system. This approach enables inclusion in flow calculations of the expansion or compression of in-situ influx gas within the wellbore. Since cessation of influx is the primary goal of dynamic well control, this work examines the transient, multiphase flow behavior in the annulus to explore limitations of the existing applied-back-pressure, dynamic, well control technique. It is shown that with the existing method, influx cessation does not always occur once flow out is constrained to equal flow in. It is also shown that in some situations where influx cessation is indeed achieved when flow out equals flow in, the back pressure applied at surface is higher than required to achieve influx cessation- i.e., influx ceases before the moment when flow out equals flow in. These outcomes are the consequence of the compressibility of the in-situ gas, and make the existing method unreliable in some critical situations of influx. A new applied-back-pressure, dynamic well control technique has been proposed, and a transient, multiphase flow analysis is used to identify pressure-based indicators of influx cessation. It is shown that time derivatives of pressure and pressure transfer carry the signature of well response for the given control strategy, and can be used to infer cessation of influx. It is argued that, taken together, these are more reliable indicators of influx cessation (and hence successful well control) than solely ensuring flow out equals flow in. Numerous transient, multiphase flow simulations have been conducted to support the key conclusions of this work.

Transient Flow In Natural Gas Transmission Systems

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Author :
language : en
Publisher:
Release Date : 1965

Transient Flow In Natural Gas Transmission Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Gas flow categories.

Compressed Gas Handbook

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Author : Richard A. Cota
language : en
Publisher:
Release Date : 1969

Compressed Gas Handbook written by Richard A. Cota and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Fluid mechanics categories.

Transient Compressible Flows In Porous Media

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Author :
language : en
Publisher:
Release Date : 1975

Transient Compressible Flows In Porous Media written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.

Transient compressible flow in porous media was investigated analytically. The major portion of the investigation was directed toward improving and understanding of dispersion in these flows and developing rapid accurate numerical techniques for predicting the extent of dispersion. The results are of interest in the containment of underground nuclear experiments. The transient one-dimensional transport of a trace component in a gas flow is analyzed. A conservation equation accounting for the effects of convective transport, dispersive transport, and decay, is developed. This relation, as well as a relation governing the fluid flow, is used to predict trace component concentration as a function of position and time. A detailed analysis of transport associated with the isothermal flow of an ideal gas is done. Because the governing equations are nonlinear, numerical calculations are performed. The ideal gas flow is calculated using a highly stable implicit iterative procedure with an Eulerian mesh. In order to avoid problems of anomolous dispersion associated with finite difference calculation, trace component convection and dispersion are calculated using a Lagrangian mesh. Details of the Eulerian- Lagrangian numerical technique are presented. Computer codes have been developed and implemented on the Lawrence Livermore Laboratory computer system. (TFD).

Compressibility Effect Of A Gas Stream On The Stability Of An Adjacent Liquid Layer

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Author : I-Dee Chang
language : en
Publisher:
Release Date : 1963

Compressibility Effect Of A Gas Stream On The Stability Of An Adjacent Liquid Layer written by I-Dee Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Air flow categories.

The interfacial stability of a liquid layer with a compressible gas flowing over it is investigated. The liquid is assumed to be incompressible and inviscid; the gas to be inviscid and to obey the equations of linearized compressible flow theory. The effects of surface tension at the gas-liquid interface and a gravitational body force are included. (Author).

Society Of Petroleum Engineers Journal

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Author : Society of Petroleum Engineers of AIME.
language : en
Publisher:
Release Date : 1972

Society Of Petroleum Engineers Journal written by Society of Petroleum Engineers of AIME. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Petroleum engineering categories.

Transient Compressible Flow In A Piping Network A Solution Method And Computer Simulation

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Author : Paul J. Lefebvre
language : en
Publisher:
Release Date : 1983

Transient Compressible Flow In A Piping Network A Solution Method And Computer Simulation written by Paul J. Lefebvre and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.

A general method of calculating the transient state of compressible fluid flow through complex piping networks has been developed and a computer program implementing this method has been written. This report presents the theory and logic upon which the solution method and program are based. It serves also as a basic introduction to the program, which is written for persons having minimal knowledge of the compressible flow theory. Keywords: Fluid dynamics; Compressible pipe flow. (EDC).

Transient Compressible Flow In Pipes

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Author : W. A. Wolfe
language : en
Publisher:
Release Date : 1974

Transient Compressible Flow In Pipes written by W. A. Wolfe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with categories.