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大牛地气田水平井普遍具有低压、低产、携液能力差及井筒压力损失大的特点,严重制约着气井后期的稳定生产。速度管采气工艺是目前水平井应用的主要排水采气工艺之一,其工作原理是利用小直径连续油管充当速度管柱,下入深度至气井造斜点以上50m,减小流体的流动面积,提高气体的流速,从而有效预防井筒积液。阐述了速度管采气工艺的工艺原理、作业过程,并根据气井临界携液理论和管流压降模型,优选出■38.1mm速度管,可经济有效地满足气田中后期生产要求。综合分析速度管下入前后气井产量、压力、生产时率、助排措施等变化情况,建立速度管现场应用效果评价准则。通过对10口速度管水平井下入前后的生产情况进行对比分析表明,水平井下入速度管后总体排水采气效果较好。此外,速度管可实现连续冲砂,且冲砂深度可到水平段,恢复气井生产后增产效果明显。
The horizontal wells in the Daniudi gas field generally have the characteristics of low pressure, low production, poor liquid carrying capacity and large pressure loss in the wellbore, which severely constrain the stable production in the later stage of gas wells. The speed tube gas production process is one of the main drainage gas production processes applied in horizontal wells at present. Its working principle is to use the small diameter coiled tubing as the speed column and the depth to 50 m above the gas production point so as to reduce the fluid flow area , Improve the gas flow rate, thus effectively preventing wellbore fluid. The process principle and operation process of gas pipelines in gas pipelines are described. According to the theory of liquid carrying capacity in pipelines and the model of pressure drop in gas pipelines, a 38.1mm speed pipe is selected to meet the requirements of middle and late production of gas field economically and effectively. A comprehensive analysis is made on the changes of gas well production, pressure, production rate and assisting drainage measures before and after the speed tube is put into operation, and the evaluation criteria for the field application effect of the speed tube are established. By comparing the production situation before and after the horizontal well of 10 velocity tubes shows that the overall drainage and gas recovery effect after the horizontal well goes into the velocity tube is better. In addition, the speed tube can achieve continuous sand blasting, and the sand blasting depth can reach the horizontal section. After the gas well is resumed, the stimulation effect is obvious.