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Pulling force simulation of jet bits in radial drilling technology

Ziaja J., Movchan V.

AGH Drilling, Oil, Gas

2016

Vol. 33, no. 2

417--424

Radial drilling technology, of which the jet bit is the key device, is a research focus in the field of oil drilling and production. This paper shows mechanical equations for jet bits and analyzes the behavior of water while passing the jet bit. Were set up few important conclusions. The generation of the pulling force is mainly due to the inlet pressure of the jet bit; the backward jets can significantly increase not only the pulling force but also the stability of jet bits. The pulling force would reach 311 N while sumilation, which can steadily pull the high-pressure hose forward.

Comparative analysis of technological efficiency of oil production intensification in carbonate collector. Advantages of the technology of radial drilling

Ziaja J., Movchan V.

AGH Drilling, Oil, Gas

2015

Vol. 32, no. 2

303--312

The paper presents a comparative analysis of the results of radial drilling, drilling perforation, cumulative reperforation and acid treatment. The study was focused at carbonate deposits in Russia. For each technology average incremental oil rates were estimated at the same exploration targets. The analysis of technological effectiveness in the given geologic and physical conditions revealed that drilling perforation and radial drilling allow reaching higher incremental oil rates compared to acid treatment and cumulative perforation. This fact confirms effectiveness of drilling radial canals by enlarging infiltration area. For the sake of completion radial drilling and drilling perforation are performed in the same wells. To reveal limiting conditions of applying radial drilling and drilling perforation an effectiveness analysis is made depending on the thickness of the interlayers exposed. To formulate criteria of radial exposing applicability an analysis of effects of different geological and physical formation parameters on geological and engineering operations effectiveness is done. The following parameters are considered: relation between the current formation pressure and initial formation pressure, formation permeability, skin factor, thickness of interlayers in overall perforation interval, thickness of interlayers exposed by radial canals.