井下油嘴在深层高压凝析气井中的研究与应用

Research and Application of Down-Hole Choke in Deep High Pressure Condensate Reservoir

气井在开采过程中易在井筒、节流处及地面集输管线内形成天然气水合物,堵塞气井的生产通道,影响气井的正常生产。井下油嘴将气井地面节流转移至井下节流,使天然气的节流、降压、膨胀和吸热过程发生在井筒内,防止天然气水合物的形成。通过分析水合物生成的影响因素,研究井下油嘴的合理下入深度和油嘴直径,形成了凝析气井井下油嘴设计技术。并通过改进井下油嘴的密封材料和工具结构,提高了其稳定性和耐压差能力,克服了深层凝析气井含液量高、压差大的难题,并在凝析气田成功推广应用6井次,取得了良好的效果和经济效益。

Gas hydrate is likely to form in wellbore,chock line and surface pipe line during production of gas well,which will block the production manifold and impact gas production.The down-hole chock moves surface choke to the bottom,therefore the process of choke,pressure reduction,expansion,and heat absorption are happened in the wellbore,and the creation of hydrate is prevented.By analyzing factors affecting hydrate creation,the reasonable setting depth and choke size were investigated.Its stability and pressure bearing are increased by improving seal material and structure.This type of choke was applied in 6 wells in condensing field and excellent economic benefits were made.