( 1. Postgradua te Co llege of Southw est Pe troleum University, Chengdu 610500; 2. K ey Laboratory of Geological and D evelopment Projec ts of Reservo irs in Southwest Petroleum University, Chengdu 610500, China),
摘要
气井井下节流工艺是将节流器置于油管的适当位置来实现井下节流调压, 利用
地热对节流后的天然气加热, 改变天然气水合物的生成条件, 对防止水合物生成起到了积极作
用。文中建立了气井井下节流压降温降以及节流后地层加热过程的数学模型, 以苏里格气田
某井为例, 应用自制气井井筒动态分析软件, 对比分析了井下节流与地面节流水合物生成与携
液情况。井下节流大幅降低水合物的生成温度, 有效解决了气井积液的生产技术难题。
Abstract
Downho le choke techno logy is to adjust downho le pressure through insta lling the choke in an appropr iate position on the tube. The gas flow ing through the choke is heated up by the g eo therm and the cond itions of g as hydrate form ation changes so as to effec tive ly prevent gas hydrate form ation. In th is article them athem atica lm ode ls of pressure drop, tem pe rature drop and form ation heating process after choke are proposed. The autho rs takes the gas w e ll SU39-14- 2 as an examp le and takes the comparative ana lysis of the genera te conditions and liqu id storage by using the se l-fm ade w e llbore dynam ic ana lytical softw are. The results show that dow nho le choke techno logy can reduce drastica lly the tem pera ture of hydra te form ing, and e ffective ly so lve the liqu id loading problem s of gas we l.l It can avo id the genera tion of hydrate through phys ica l m ethods and is m ore favorab le and econom ical than a lcohol in jec tion.
论文详情