Design and simulation of turbine oscillation sand washing tool for horizontal wells
At present,horizontal wells are commonly used in the development of high permeability unconsolidated sandstone oil and gas reservoirs.During the development,the problem of sand production is often faced,that is,when sand is produced from the oil layer,sand grains will flow into the wellbore immediately after the crude oil,and then gradually settle in the lower position of the horizontal section to produce a sand bed.The existence of the sand bed will affect the exploitation of oil,block the oil extraction channel,increase the flow resistance,and even damage the downhole equipment,causing downhole sand sticking accident.To address the current problems of low efficiency,poor effect and easy blockage of sand washing of conventional horizontal wells in China,a turbine oscillation sand washing tool for horizontal wells is designed in this paper,the general scheme of the sand washing tool is determined,the oscillation and sand washing parameters are calculated,and the sand washing effect of the washing head is simulated.The study shows that the tool breaks the sand by oscillating and rotating so that sand grains are not easily deposited in the wellbore to form a sand bed,which ensures that the sand washing tool is not easy to stick without affecting the sand washing efficiency,and the arrangement of the nozzle of the washing head can make the washing effect more significant.
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