龙王庙组气藏采气地面流程水合物防治研究  

HOW TO PREVENT AND CONTROL HYDRATES IN SURFACE PRODUCTION EQUIPMENT DURING DEVELOPMENT OF LONGWANGMIAO GAS RESERVOIR

作　　者：余忠仁[1] 

机构地区：[1]中国石油西南油气田公司川中油气矿

出　　处：《钻采工艺》2017年第3期34-37,共4页Drilling & Production Technology

基　　金：国家科技重大专项"复杂碳酸盐岩气藏开发技术研究"(编号:2011ZX05015-003-005);中国石油重大勘探专项"四川盆地乐山-龙女寺古隆起含油气评价及勘探配套技术研究"(编号:2012ZD01-03-01)

摘　　要：磨溪区块龙王庙组气藏气井油压高、节流压差大,开井过程中,采气地面工艺流程容易形成水合物发生堵塞,带来安全隐患,影响生产。通过优选天然气水合物计算模型预测水合物生成条件,计算分析不同开井制度和工况条件下水合物生成温度和各节点温度变化,结果表明,采气地面工艺流程的水合物生成与井口温度、压力密切相关,在总节流压差一定的情况下,水合物生成与各级节流压差分配无,相关性,末级节流下游更容易生成水合物。基于不同工况条件对水合物形成的影响,提出大产量开井升温、建立背压减少节流压差、加乙二醇抑制水合物生成的开井方式,通过在龙王庙组气藏气井开井实践应用,避免了采气地面流程堵塞的发生,确保了安全顺利投产。The gas wells in Longwangmiao gas reservoir at Moxi block is featured with high tubing pressure and high throttling pressure difference,hydrates are often seen clogged in the surface production equipment when flowing the well,endangering the well production. Optimum natural gas hydrate calculation model was ever chosen to predict the hydration conditions,to calculate and analyze the hydration temperatures and temperature changes at different nodes when different production systems used or under different working conditions. The results showed that the formation of gas hydrates in the surface production equipment was closely related to the wellhead temperatures and pressures. When the total throttle pressure difference was certain,the hydrate generation had nothing to do with the throttle pressure difference distribution at different stages,the hydrates were more likely to occur at the downstream of the last throttling stage. Due to the hydration varied according to different working conditions,the methods of starting the well flowing at high rate to raise well temperature,exerting backpressure to reduce throttle pressure difference,or adding glycol to inhibit the hydration were proposed,and applied in well startup at Longwangmiao gas reservoirs,no hydrate blockage in the ground equipment,the well was successfully put into production.

关 键 词：水合物 开井 龙王庙组气藏 抑制剂 

分 类 号：TE37[石油与天然气工程—油气田开发工程]