Optimization Studies of an Oil Well Drilling Process

In order to avoid solid-liquid gravitational separation of particles in the drilling fluid and cuttings generated in this process, the oil industry has been developing drilling fluids with shear-thinning and thixotropic characteristics. In case of operational stops in the drilling process, the intense sedimentation of these particles can damage the equipment used and the well. In this context, this study simulated an operational stop to obtain information about stability of solids in a paraffin-based suspension with time-dependent shear-thinning behavior, which has already been used in current drilling processes. A long-term test using gamma-ray attenuation technique identified the separation dynamics of a set of micrometric particles belonging to and incorporated into the drilling fluid during operation. This test verified the typical regions of gravitational sedimentation and, through constant concentration curves, indicated that the sedimentation process did not occur at a constant rate. This study also proposed a constitutive equation for pressure on solids.

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Oil Well Drilling Process - Simulation and Experimental Multi-Objective Studies

Computer Aided Chemical Engineering - 21st European Symposium on Computer Aided Process Engineering ◽

10.1016/b978-0-444-54298-4.50145-8 ◽

2011 ◽

pp. 1834-1838

Author(s):

Márcia Peixoto Vega ◽

Marcela Galdino de Freitas ◽

Claudia Miriam Scheid ◽

André Leibsohn Martins

Keyword(s):

Process Simulation ◽

Oil Well ◽

Drilling Process ◽

Well Drilling ◽

Multi Objective

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Effect of eccentricity and inner pipe motion on flow instability for flow through annulus

SN Applied Sciences ◽

10.1007/s42452-021-04500-z ◽

2021 ◽

Vol 3 (4) ◽

Author(s):

Satish Kumar Dewangan

Keyword(s):

Flow Instability ◽

Flow Stability ◽

Radius Ratio ◽

Stability Parameter ◽

Oil Well ◽

Drilling Process ◽

Fully Developed Flow ◽

Well Drilling ◽

Energy Gradient ◽

Flow Through

AbstractPresent work implements the Energy gradient method (EGM) to study the effect of variation in eccentricity, radius ratio and inner pipe movement on the fully developed flow of Newtonian fluid through an annulus for the flow instability. The formula for the flow stability parameter has been derived considering the eccentricity and radius ratio of the annulus. Results have been plotted for flow stability parameter (K) for annulus of various eccentricity and radius ratio. Further, the relationships for the critical flow parameter have also been obtained. Flow instability is very crucial parameter in oil well drilling process as turbulent flow is desirable for the transportation of rock cuttings to the surface generated during the process.

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Hydrogen Bonds-Enhanced Organoclay-Free Oil Based Drilling Fluid System

Materials Science Forum ◽

10.4028/www.scientific.net/msf.890.227 ◽

2017 ◽

Vol 890 ◽

pp. 227-234

Author(s):

Xian Bin Huang ◽

Guan Cheng Jiang

Keyword(s):

Hydrogen Bonding ◽

Hydrogen Bonds ◽

Drilling Fluid ◽

Control Agent ◽

Drilling Fluids ◽

Oil Well ◽

Drilling Process ◽

Well Drilling ◽

Filtration Loss ◽

Organophilic Clay

Conventional oil based drilling fluids or muds (OBMs) using organophilic clay as viscosifier and rheological control agent cannot carry drill cuttings and suspend weighting materials effectively in oil well drilling process. It also causes excessive viscosity of drilling fluids, which lowers the rate of penetration. For the sake of solving these problems, in this study, hydrogen bonds-enhanced organoclay-free oil based drilling fluid was proposed. Firstly key additives (emulsifier, filter reducer) for OBMs with highly electronegative groups that might form hydrogen bonds were synthesized. In addition, a hydrogen bonding linker was synthesized and used to connect other additives to form a hydrogen bonding network in OBMs. The properties of drilling fluids were characterized by rheological measurements, static filtration experiments and plugging experiments. Experimental results show that, compared with the conventional OBM, the hydrogen bonds-enhanced organoclay-free OBMs substantially increased yield point (YP) and gel strengths, reduced filtration loss and exhibited a better plugging ability on high-permeability sand cores. Besides, a higher stability was also observed.

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Dynamic Characteristics of Annular Fluid Transmission Lines

Journal of Fluids Engineering ◽

10.1115/1.3447172 ◽

1974 ◽

Vol 96 (4) ◽

pp. 370-376

Author(s):

A. J. Healey ◽

J. A. Nicholson

Keyword(s):

Automatic Control ◽

Dynamic Characteristics ◽

Transmission Lines ◽

Phase Speed ◽

Signal Propagation ◽

Signal Frequency ◽

Oil Well ◽

Drilling Process ◽

Well Drilling ◽

Equivalent Radius

Automatic control of an oil well drilling process requires the knowledge of the dynamics of signal propagation through the annulus formed between the drill and the casing. This paper extends work previously done for circular lines to the annular case. Attenuation and phase speed are presented for various radius ratios as a function of signal frequency. For the liquid case, the results are correlated through the use of an equivalent radius.

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On the modeling of oil well drilling processes

Engineering Computations ◽

10.1108/ec-03-2013-0093 ◽

2015 ◽

Vol 32 (2) ◽

pp. 387-405 ◽

Cited By ~ 1

Author(s):

Esteban Della Nave ◽

Eduardo Natalio Dvorkin

Keyword(s):

Dynamic Simulation ◽

A Priori ◽

Time Integration ◽

Time Range ◽

Integration Scheme ◽

Oil Well ◽

Drilling Process ◽

Well Drilling ◽

Content Type ◽

Contact Algorithm

Purpose – The purpose of this paper is to present the development of a simulator of oil well drilling processes. Design/methodology/approach – The simulator incorporates the main variables that are used by drilling engineers in the definition of the drilling processes. The code is useful a priori, in the design of a drilling process, as a tool for comparing different design options and predicting their results and a posteriori of a failure to understand its genesis and therefore provide know-why to improve the drilling techniques. Findings – The developed finite element simulator uses a co-rotational Bernoulli beam element, an explicit time integration scheme and an explicit contact algorithm. The numerical results show that the simulator is stable and provides consistent solutions. Practical implications – During the drilling of oil wells, the fatigue damage and wear of the drilling column is of utmost concern. To determine the mechanical behavior of the drilling column standard simplified analyses are usually performed using commercially available codes; however, those standard analyses do not include a transient dynamic simulation of the process; hence, it is necessary to develop a specific tool for the detailed dynamic simulation of drilling processes. Originality/value – A simulator able to perform a description of the drilling process in the time range will be an important contribution to the tools used by drilling engineers.

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