气井井筒临界携垢流量计算与分析  

Calculation and Analysis of Critical Scale Carrying Flow Rate in Gas Wells

作　　者：陆国琛 秦丙林 田天 唐登宇 刘一哲 Lu Guochen;Qin Binglin;Tian Tian;Tang Dengyu;Liu Yizhe(Petroleum Engineering Institute of Sinopec Shanghai Offshore Oil&Gas Company)

机构地区：[1]中国石油化工股份有限公司上海海洋油气分公司石油工程技术研究院

出　　处：《石油机械》2023年第10期107-112,共6页China Petroleum Machinery

基　　金：中国石油化工集团有限公司科技项目“平北复合型油气藏钻完井关键技术研究”(P20015)。

摘　　要：为准确预测气井井筒临界携垢流量,优化气井防垢措施,指导气井后期生产制度选择,基于气固两相流理论建立了气井井筒临界携垢流量计算方法。采用该计算方法研究了温度、压力、垢物颗粒直径、油管尺寸等因素对临界携垢流量的影响,并对海上T-C1井临界携垢流量进行了预测。结果表明:气井井筒临界携垢流量随着温度的下降而减小,随着压力的增加而变大,随着颗粒直径的增大而增大,随着油管直径的增加而变大;T-C1井中100μm垢物颗粒的临界携垢流量为10.2×10^(4)m^(3)/d,当实际产量略低于临界携垢流量时,井筒会积聚垢物颗粒,导致产量持续下降,从而进一步加剧垢物积聚,造成气井很快出现停喷现象,预测结果与实际生产和作业情况相符。可见基于气固两相流理论建立的气井井筒临界携垢流量计算方法准确、可靠。所得结论可为优化气井防垢措施提供一定的理论依据。In order to accurately predict the critical scale carrying flow rate in gas wells,optimize scale prevention measures,and guide the selection of production systems in the later stage of gas wells,a calculation method for the critical scale carrying flow rate in gas wells was established based on the gas-solid two-phase flow theory.The calculation method was then used to study the effects of temperature,pressure,scale particle diameter and tubing size on the critical scale carrying flow rate,and conduct prediction on the critical scale carrying flow rate of offshore T-C1 well.The study results show that the critical scale carrying flow rate in the gas well decreases with the decrease of temperature,and increases with the increase of pressure,particle diameter and tubing diameter respectively.In Well T-C1,the critical scale carrying flow rate of 100μm scale particles is 10.2×10^(4)m^(3)/d.When the actual production rate is slightly lower than the critical scale carrying flow rate,scale particles accumulate in the wellbore,leading to a continuous decrease in production rate,thus further aggravating the accumulation of scale and causing the gas well to quickly quit flowing.The predicted results are consistent with the actual production and operation situation,indicating that the calculation method for the critical scale carrying flow rate in gas wells established based on the gas-solid two-phase flow theory is accurate and reliable.The conclusions provide a certain theoretical basis for optimizing scale prevention measures of gas wells.

关 键 词：气井 结垢 雷诺数 气固两相流理论 临界携垢流量 

分 类 号：TE355[石油与天然气工程—油气田开发工程]