000			02707nab a2200205 4500
005			20260520001936.0
008			260224s2010 xxu
245	0	0	_aExperimental study on horizontal wellbore cleanout by rotating jets
260			_a _b _cdic. 2010
270			_a26/05/2011 ; 26/05/2011
300			_a5 p. ; 71-76
520			_aTranscripción del resumen del autor: Horizontal wellbore cleanout by rotating jets has been developed rapidly in the past decades. To improve the sand cleanout efficiency, the strength of helical flow as one of the most important factors is necessary to be investigated and optimized. The flow rate, nozzle size, nozzle orientation and annular size have the major influence on the arising, performing and attenuating of annular helical flow. This paper presents the experimental results of a horizontal wellbore cleanout with varying nozzle assemblies in orifice size and orientation, tubing size, solid size, and flow rate. The tests of stationary circulation and wiper trip were carried out respectively. In the stationary circulation stage, there exists a critical length between sand bed and cleaning tool which results the two kinds of mechanisms to transport the sand. When the distance is shorter than the critical length, the primary mechanism of sand suspend is annular helical flow. As the distance is longer than it, the mechanism turns into straight annular flow which results in lower cleanout efficiency. In this study, the critical length increases rapidly with the increase of flow rate, tubing size and sand size. The sand bed moving velocity changing with the distance was also investigated and it is beneficial to optimize the wiper trip speed of cleaning tool. For the wiper trip stage, there exists the maximum wiper speed which can fulfill the requirement of completely sand cleanout when the tool is pulled out of the hole(POOTH), and it increases with the increase of flow rate and tubing size, and the decrease of sand size. The nozzle assembly is one of the most important factors to affect the helical flow profile and sand cleanout efficiency. The optimum lateral nozzle size and nozzle orientation were also obtained to get a best performance in annular helical flow and wiper trip speed. This study can contribute to the optimum design of nozzle assemblies, operation procedures and hydraulic parameters so that the highest efficiency of horizontal wellbore cleanout can be achieved.
581			_a1-2
773	0		_tJournal of Petroleum Science & Engineering _g75
942			_cARTICULO
100	1		_aSong, X.Z. _950018
100	1		_aLi, G.S. _950019
100	1		_aHuang, H.Z. _950020
999			_c182023 _d182023