Scribd
Upload
36 views1 page

Resumo

The document discusses the complexities of drill cuttings transport and deposition in deviated oil and gas wells, emphasizing the importance of effective annular wellbore cleaning for economic viability. It highlights factors affecting particle slip velocity and carrying capacity of drilling muds, which are critical for optimal drilling fluid performance. Additionally, it addresses the need for further investigation into flow development characteristics in vertical annular flow to understand hydrodynamic equilibrium.

Uploaded by

Victor Santana
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
36 views1 page

Resumo

The document discusses the complexities of drill cuttings transport and deposition in deviated oil and gas wells, emphasizing the importance of effective annular wellbore cleaning for economic viability. It highlights factors affecting particle slip velocity and carrying capacity of drilling muds, which are critical for optimal drilling fluid performance. Additionally, it addresses the need for further investigation into flow development characteristics in vertical annular flow to understand hydrodynamic equilibrium.

Uploaded by

Victor Santana
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 1

Drill cuttings transport and deposition in complex annular geometries of deviated oil and gas

wells: A multiphase flow analysis of positional variability

Emmanuel I. Epelle, Dimitrios I. Gerogiorgis ∗

Research efforts that address annular wellbore cleaning operations have continued to evolve
over the past decades and this is because the resultant problems of inadequate hole cleaning
can be highly detrimental to the overall economics and profitability of a drilling project in an oil
and gas field.

Experimental Study of Drilled Cuttings Transport Using Common Drilling Muds

Syed M. Hussaini, *

The particle slip velocity is an important factor and is defined as the velocity at which a particle
tends to settle in a fluid because of its own weight. The velocity depends on the particle size,
its geometry, its specific weight, and fluid rheological properties. The carrying capacity of muds
also is affected by the velocity profile in the annulus. With all these variables acting
simultaneously. the determination of carrying capacity of a mud becomes a complicated
problem. An optimal drilling fluid is expected to lift the cuttings from the wellbore, suspend
them when circulation is stopped, and drop them at the surface. Failure to achieve this
performance often leads to problems that are costly and timeconsuming to solve.

Pigott, R.J.S.: "Mud Flow in Drilling," Drill. and Prod. Prac., API (1941) 91-103.

Pigot introduced the concept that turbulent flow induces turbulent slip velocities and
suggested that laminar flow in the annulus would result in more efficient transport. He
recognized the importance of annular velocity and fluid density but concluded that higher
viscosity is not desirable.

Flow development in vertical annular flow

A. Wolf, S. Jayanti*, G. F. Hewitt

One of the important areas yet to be investigated thoroughly in annular flow is the evolution
of the flow characteristics leading to the fully developed #ow under hydrodynamic equilibrium.

There is thus conflicting evidence for the length required for annular #ow to become fully
developed. It appears that some parameters such as wave spectrum and entrainment fraction
take a fairly long distance to develop while other parameters such as the wave velocity and
pressure gradient will develop much more quickly.

You might also like