Papers by hakki gucuyener
Proceedings of SPE/ICoTA Coiled Tubing Conference & Exhibition, 2006
This study presents a mathematical model for calculating bit pressure drop for gasified drilling ... more This study presents a mathematical model for calculating bit pressure drop for gasified drilling fluids. In the literature, there are several studies on determination of the pressure losses for multiphase fluids. The models, however, are either valid for high gas flow rates or developed using very strong assumptions. The theory, which is valid for both sonic (critical) and subsonic (sub-critical) regimes, is based on the solution of the general energy equation for compressible fluid flow. Unlike the existing models, the proposed model takes change in the kinetic energy, compressibility factor, and internal energy terms into consideration. Moreover, the model uses "a mixture sound velocity" approach for determination of the sonic boundary of the fluid. By developing a program, the pressure drop through a nozzle could be calculated in the subsonic flow region. The program has been run with reasonable field data. The results have been compared with the results of existing models and less than a 9% variation was estimated.
Proceedings of SPE Asia Pacific Oil and Gas Conference and Exhibition, 2003
... In general, mechanistic models are expressed in terms the phase superficial velocities. The l... more ... In general, mechanistic models are expressed in terms the phase superficial velocities. The liquid superficial velocity, SPE 80491 Design of Aerated Mud for Low Pressure Drilling İ. Hakkı Gücüyener, Turkish Petroleum Co. Page 2. 2 SPE 80491 ...
Middle East Oil Technical Conference and Exhibition, 1983
ABSTRACT
SPE/ICoTA Coiled Tubing Conference & Exhibition, 2006
This paper presents a mathematical model for calculating bit pressure drop for gasified fluid dri... more This paper presents a mathematical model for calculating bit pressure drop for gasified fluid drilling (GFD). The proposed model is valid for both sonic and subsonic regimes. The exact and complete solution with theoretical and experimental verifications is first presented here. Unlike the ...
Journal of Petroleum Science and Engineering, 2014
ABSTRACT Shallow water and lost circulation are frequently encountered problems during drilling t... more ABSTRACT Shallow water and lost circulation are frequently encountered problems during drilling top holes of oil and gas wells. Plenty of methods have been applied to overcome these problems. Among these methods, silicate based gels are one of the oldest. For this study, Sodium-Silicate based gel system is investigated experimentally and several aspects of the system are improved for efficient field applications. This improved gel system is deliberately delayed, multi-component system to be mixed as a uniform liquid at the surface facilities but desired to form gel structure where it is placed in the well. Gel slurries are composed of distilled water, Sodium-Silicate solution, polymer solution, lost circulation materials, weighting agent and organic initiator (initiating the gelation). In this study, effect of these components on gel time, gel quality and gel strength at room temperature is investigated as a function of their concentration.
Petroleum Science and Technology, 2000
ABSTRACT The objective of this research is to investigate the concentration effect on the rheolog... more ABSTRACT The objective of this research is to investigate the concentration effect on the rheological properties of different bentonite suspensions. Experiments were performed with different bentonite type and concentrations and the results were evaluated by different rheological models (Bingham plastic, Power law, Sisco, Casson, Herchel Bulkley and Robertson Stiff) describing the flow of non-Newtonian fluids by mathematical equations in terms of shear rate and shear stress.
Journal of Petroleum Science and Engineering, 1996
ABSTRACT This paper presents an analysis of the laminar-turbulent transition for flow of yield-ps... more ABSTRACT This paper presents an analysis of the laminar-turbulent transition for flow of yield-pseudoplastic fluids in pipes and concentric annuli. The yield-pseudoplastic rheology is represented by the three-parameter Robertson-Stiff model. A modified Reynolds number is developed based on an equivalent diameter including characteristic parameters of the flow situations under consideration. Using the literature data, Hanks' theory of laminar flow stability is reanalyzed in comparison with other correlations. On account of the generality of Hanks' stability criterion and its experimentally proven success to some extent, it is used herein to calculate critical values of the modified Reynolds number. Numerical results are presented in terms of the dimensionless rheological parameters and the annulus aspect ratio. Further, it is shown that constant critical value of Hanks' stability parameter (Kmc = 404) does not necessarily apply to non-Newtonian fluids. This fact is demonstrated for pipe flow of Bingham plastic fluids.
Energy Sources, 2002
This paper demonstrates the order of in uence of end effects on the application of a theory to de... more This paper demonstrates the order of in uence of end effects on the application of a theory to determine and correct the end effects in Couette coaxial cylinder rotational viscometers, which are commonly used for the rheological evaluation of drilling uids. It is found that higher shear stresses are measured due to end effects and, consequently, this error bearing shear stress-shear rate data leads to unreliable predictions of the rheological parameters. Evaluation of the shear stress-shear rate data obtained from various drilling uids indicates that the ow curve corrected for end effects deviates signi cantly from the measured curve. A parametric analysis for the rheological models, such as the Bingham plastic, power law, and yield-pseudoplastic models, is also performed with the parameters of the selected rheological model.
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2006
The objective of this study was to identify the descriptive tests for drilling stable holes throu... more The objective of this study was to identify the descriptive tests for drilling stable holes through the problems of the selected formations. This study was performed on the shale samples taken from 10 wells in which hole instability was encountered to various extents during drilling ...
AIChE Journal, 1992
Many industrially important non-Newtonian fluids such as drilling fluids and cement slurries exhi... more Many industrially important non-Newtonian fluids such as drilling fluids and cement slurries exhibit yield-pseudo-plastic behavior. The axial laminar flow of such fluids in concentric annuli has received very little attention to date. This problem was first studied by , who presented results obtained for the Herschel-Bulkley rheological model. recently showed that Hanks' numerical results are erroneous in several cases.
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Papers by hakki gucuyener