Study and Application of Blowoff Device with Combined Nozzle for Ultra-Heavy Oil Well

doi:10.3969/j.issn.1006-6535.2021.05.024

Abstract

Abstract: Five-stage nozzle is used to control the blowoff rate of fluids produced in the ultra-heavy oil wells. The fluid production rate fluctuates greatly before and after nozzle replacement, and as water content decreases, the viscosity of oil increases, the blowoff may be suspended, which affects the specific time for oil well blowoff and the time to run in pump. For this purpose, a blowoff technology with combined nozzle was developed. The technology was designed with special shaped overflow outlet and cylindrical spool. The special shaped overflow outlet was designed with different curvatures in the front, middle and rear sections, and the overflow area could be adapted to the blowoff rate in smooth, rapid and slow periods. The valve opening was linearly matched to the blowoff rate by matching the special shaped overflow outlet with the cylindrical spool to achieve smooth stepless adjustment of the blowoff rate. The energy loss of wellhead during blowoff could be reduced by optimizing the position of special shaped overflow outlet. The technology has been applied 113 times on site in Liaohe Oilfield, cumulatively reducing the total blowoff time by 4 123.0h. The technology can be used as a reference for optimizing the blowoff system in ultra-heavy oil wells.

Key words: ultra-heavy oil, blowoff, nozzle, special shaped overflow outlet, steam stimulation

CLC Number:

TE355.5

Gao Zhongmin, Yang Bo, Chen Weidong. Study and Application of Blowoff Device with Combined Nozzle for Ultra-Heavy Oil Well[J]. Special Oil & Gas Reservoirs, 2021, 28(5): 168-174.

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