Experimental investigation of cuttings transport in horizontal wells using aerated drilling fluid

Gül, Sercan
A new experimental approach has been introduced in this thesis for the cuttings transport in horizontal wellbores with the introduction of drag reducers into the aerated drilling fluids. Advanced Flow Loop System (annular test section of 21 ft. long 2.91-in. ID transparent casing and 1.85 in. OD inner drill pipe) in Middle East Technical University Petroleum and Natural Gas Engineering Department have been used for the experiments. The liquid phase has been water and water-PHPA copolymer mixture where the gaseous phase has been dried air. Water and water-polymer mixture experiments have been conducted in 0.05%V/V, 0.07%V/V, and 0.10% V/V PHPA polymer concentrations. It was observed that optimum concentration of PHPA polymers in water for the given experimental test section is 0.07% with average drag reduction of 41.88% in single phase flow. Moreover, increasing water and gas flow rates increases the differential pressures. Four main flow regimes were observed in the experiments which are a bubble, elongated bubble, slug and wavy annular. It was also observed that adding PHPA polymers in water shifts the flow regime transition boundaries to higher y values and water is the main phase in cuttings transport. Effect of increasing gas velocities is much lower compared with the effect of increasing liquid velocities in cuttings transport. Using PHPA polymers in 0.07% reduced the cuttings area by an average of %4.05 while reducing the differential pressures by an average of %23.90 with the existence of cuttings at the rate of penetration of 115 ft./hr.


Determination of cuttings transport properties of gasified drilling fluids
Ettehadi Osgouei, Reza; Mehmetoğlu, Mustafa Tanju; Özbayoğlu, Mehmet Evren; Department of Petroleum and Natural Gas Engineering (2010)
The studies conducted on hole cleaning have been started with single phase drilling fluids for vertical holes in 1930’s, and have reached to multiphase drilling fluids for directional and horizontal wells today. The influence of flow rate and hole inclination on cuttings transport has been well understood, and many studies have been conducted on effective hole cleaning either experimentally or theoretically. However, neither the hydraulic behavior nor the hole cleaning mechanism of gasified drilling fluids ...
Effects of nanoparticles on the performance of drilling fluids
Bal, Berk; Kök, Mustafa Verşan; Gücüyener, İsmail Hakkı; Department of Petroleum and Natural Gas Engineering (2017)
In this master thesis, effects of nanoparticles on the filtration and rheological properties of water-based drilling fluids are experimentally investigated. Four different silica nanoparticles are added into the lignosulfonate and bentonite based drilling fluids. By using data obtained at the end of this research, filtration and rheological properties of nanofluids are analyzed and compared with the base fluids at different temperatures. Two groups of experiments are conducted in this research. In the first...
Economical impact of a dual gradient drilling system
Peker, Merter; Parlaktuna, Mahmut; Department of Petroleum and Natural Gas Engineering (2012)
Dual Gradient Drilling (DGD) system is a promising technology that was developed to overcome the deep water drilling problems occurred due to narrow operating window between pore pressure and fracture pressure. In conventional drilling practice, single mud weight exists from drilling unit to TVD (True Vertical Depth) which creates big hydrostatic pressure in bottom hole ,moreover, minor changes in mud weight results a big pressure changes proportional to the length of hydrostatic column increase with water ...
An Experimental study on usage of hollow glass spheres (HGS) for reducing mud density in low pressure reservoirs and lost circulation zones
Arı, T. Çağrı; Akın, Serhat; Department of Petroleum and Natural Gas Engineering (2014)
Drilling fluid is a fluid mixture that is used in oil and gas drilling operations. Generating hydrostatic pressure, carrying cuttings to the surface and maintaining wellbore stability is essential for a drilling fluid with its other important functions. For low pressure reservoirs, hydrostatic pressure that drilling fluid generated should be low. To achieve that, drilling fluid density should be lowered. However, use of drilling fluids with higher density than required could cause partial or complete loss o...
Sensitivity Analysis of Major Drilling Parameters on Cuttings Transport during Drilling Highly-inclined Wells
Ozbayoglu, E. M.; Miska, S. Z.; Takach, N.; Reed, T. (Informa UK Limited, 2009-01-01)
In this study, a layered cuttings transport model is developed for high-angle and horizontal wells, which can be used for incompressible non-Newtonian fluids as well as compressible non-Newtonian fluids (i.e., foams). The effects of major drilling parameters, such as flow rate, rate of penetration, fluid density, viscosity, gas ratio, cuttings size, cuttings density, wellbore inclination and eccentricity of the drillsting on cuttings transport efficiency are analyzed. The major findings from this study are,...
Citation Formats
S. Gül, “Experimental investigation of cuttings transport in horizontal wells using aerated drilling fluid,” M.S. - Master of Science, Middle East Technical University, 2017.