连续管尺寸及作业深度对速度管柱的影响研究

针对连续管速度管柱作业减少气井生产中的井底积液及提升产量的问题,通过开展连续管尺寸及其作业深度对速度管柱的影响研究,优选出合理的连续管管径、壁厚及其作业深度,通过分析油藏流入动态曲线(IPR曲线)与油管流出动态曲线(J曲线)之间的关系,确定了不同速度管柱设计能否使已停产的气井恢复生产或持续生产。研究结果表明:气井产生积液时,采用小管径的连续管速度管柱作业能提高气体携液能力,但管径不应过小,过小会降低携液能力;根据储层位置及实际工况,可确定速度管柱最优作业深度,以确保气井长期高效生产;优选的速度管柱作业用连续管及作业深度,能明显提高气井日产气量。研究结果可为含水气藏的开发提供技术支撑。

Influence of Coiled Tubing Size and Lowering Depth on Velocity String Operation

Aiming to resolve the problem of liquid loading at the well bottom during gas well production and increase the well production by installing coiled tubing as a velocity string,a study on the influence of coiled tubing size and lowering depth on velocity string operation was carried out to optimize the reasonable size,wall thickness and operating depth of the coiled tubing.Based on analysis of the relationship between the reservoir inflow performance relationship curves(IPR curves)and the tubing outflow performance curves(J-curves),different velocity string design schemes were determined whether they are able to sustain gas-well production or put a non-production gas well back into production.The study and analysis showed that:velocity string operations with small-sized coiled tubing can improve the liquid-carrying capacity of gas when liquid loading taking place in gas wells;however,the liquid-carrying capacity will be reduced if the size of the coiled tubing is too small.According to the reservoir depth and actual operating condition,the optimal operating depth of velocity string can be determined to guarantee the long period high-efficient gas-well production.With the optimal coiled tubing size and operating depth,velocity string operation can remarkably increase the daily output of gas wells and successfully stimulate the production.The study results can provide technical support for the development of water-bearing gas reservoirs.