Experimental and numerical investigation of formation damage caused by drilling fluids

Download
index.pdf
2006
İşcan, Abdullah Gürkan
Show full item record
213
views
93
downloads
In this thesis, permeability impairment caused by drilling fluids and subsequent cleaning and permeability enhancement by back-flow were investigated by means of experimental and simulation studies. Permeability damage caused by three different drilling fluids was measured experimentally by core tests as a function of the filtration pressure and analyzed using a simulator describing the fines migration and retention in porous media. The pore throat plugging criteria for the three drilling fluids were determined. The particle concentration and the fraction of depositing particles were obtained simultaneously as a function of time and distance along the core length by numerical solution. Simulations were run both with experimental data in forward and backward directions along the core samples. Permeability damage ratio was correlated with respect to drilling filtration pressure specially for each type of the drilling fluids and type curves were constructed. Simulation results accurately match the experimental data, indicating that this simulator can be used for the estimation of permeability reduction, and the permeability and porosity variation along the core samples at various filtration pressures. X-Ray digital image subtraction was applied to different sections of the core plugs before and after the circulation to visualize the fines migration into porous media. The maximum damage ratio was obtained with the CMC added drilling fluid with 81 %. In the absence of CMC and Polymer-XT, the damage ratio was found as 72.8%. It was also determined that a polymer-added drilling fluid characterized with 63.8% permeability damage ratio is the optimum drilling fluid, causing less formation damage than the water-based bentonite mud.
Engineering geology., Soil mechanics., Rock mechanics., Underground construction.
http://etd.lib.metu.edu.tr/upload/12607592/index.pdf
https://hdl.handle.net/11511/15909
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Alteration of permeability by drilling fluid invasion and flow reversal
Iscan, A. Gurkan; Civan, Faruk; Kök, Mustafa Verşan (Elsevier BV, 2007-08-01)
Permeability impairment caused by drilling fluids and subsequent cleaning and permeability enhancement by backflow are investigated by means of experimental and simulation studies. Damage caused by two different drilling fluids is measured experimentally by core tests as a function of the filtration pressure and analyzed using a simulator describing the fines migration and retention in porous media. Simulations were run both with experimental and synthetic data in forward and backward directions along the c...
Matrix fracture interaction in sandstone rocks during carbon dioxide, methane and nitrogen injection
Bülbül, Sevtaç; Parlaktuna, Mahmut; Department of Petroleum and Natural Gas Engineering (2012)
The aim of the study is to investigate matrix-fracture interaction, gas oil gravity drainage (GOGD) and diffusion mechanisms with CO2, N2 and CH4 gas injection in a fractured system. Effects of injected gas type, initial gas saturation and diffusion coefficient on oil recovery are studied by an experimental and simulation work. In the experimental study, Berea sandstone cores are placed in a core holder and the space created around the core is considered as a surrounding fracture. System is kept at a pressu...
Analytical and Numerical Modeling of CO2 Sequestration in Deep Saline Aquifers
Ozgur, E.; Gumrah, F. (Informa UK Limited, 2010-01-01)
The analytical and numerical modeling of CO2 sequestration in deep saline aquifers having different rock and fluid properties was studied under diffusion and convection mechanisms. In a diffusion dominated system, an aquifer with 100 m thickness was saturated with CO2 after 10,000,000 years. It was much earlier in a convective dominant system. In the diffusion process, the dissolution of CO2 in aquifer increased with porosity increase; however, in a convection dominant process dissolution of CO2 in aquifer ...
Engineering geological and geotechnical site characterization and determination of the seismic hazards of Upper Pliocene and Quaternary deposits situated towars the west of Ankara
Koçkar, Mustafa Kerem; Akgün, Haluk; Department of Geological Engineering (2006)
The purpose of this study is to assess the engineering geological and geotechnical characteristics and to perform seismic hazard studies of the Upper Pliocene and Quaternary deposits located towards the west of Ankara. Based on a general engineering geological and seismic characterization of the site, site classification systems are assigned for seismic hazard assessment studies. The objective of the research is to determine the regional and local seismic soil conditions, predominant periods and ground ampl...
Experimental and numerical investigations for mechanical and microstructural characterization of micro-manufactured AZ91D magnesium alloy disks for biomedical applications
Kayhan, Said Murat; TAHMASEBİFAR, Aydin; KOÇ, Muammer; Usta, Yusuf; Tezcaner, Ayşen; Evis, Zafer (2016-03-05)
In this study, the microstructure, mechanical and biological properties of the Mg-based implant samples prepared by the combination of micro-manufacturing and powder metallurgy route were investigated. Porous AZ91D Mg alloy disks with smooth and textured surfaces were manufactured under compaction pressures of 25 and 40 MPa at 150 degrees C and under sintering conditions of 380 degrees C for 30 and 150 min. The phase changes and microstructure were analyzed using X-ray diffraction (XRD), scanning electron (...
Citation Formats
A. G. İşcan, “Experimental and numerical investigation of formation damage caused by drilling fluids,” Ph.D. - Doctoral Program, Middle East Technical University, 2006.
METU IIS - Integrated Information Service open@metu.edu.tr