连续油管深井排水采气技术

TECHNOLOGY OF GAS RECOVERY BY WATER DRAINAGE FOR DEEP WELLS WITH COILED TUBING

文章提出了产水气井开采中、后期,由于产层压力下降、水量增加,原有生产管柱结构不合理,产出水 不能及时排出,从而使气井停喷的问题;阐述了连续油管作业不需压井,可避免伤害地层,同时减小了油管断脱等 复杂事故的风险;介绍了国外除将连续油管广泛用于冲砂洗井、诱喷助排、酸化、扩眼、侧钻等井下作业外,还作为 排液加速管柱和完井管柱在油气生产井中使用的情况。采用连续油管用作生产管柱在我国尚属首次,文章概述了 国内外连续油管技术水平,连续油管排水采气所需的连续油管、连续油管作业车、悬挂作业操作窗、连续油管井口 悬挂器、连续油管堵塞器及其他配套工具、装备以及其作业过程,最后综述了张13井连续油管悬挂作业情况、排水 采气试验情况,进行了经济效益分析,提出了连续油管排水采气的3条认识与建议。

The article proposes the un-flowing problem of water-producing gas wells at the middle and late stages since the reservoir pressure drops, water-producing volume increases and the produced water can't be discharged in time because the original production string is not suitable. It is explained the reason why the jobs with coiled tubing have not to kill wells, can prevent formation damage and reduce the risk of complicated accidents such as tubing breaking and falling etc. It is introduced coiled tubing is widely used not only for sand washing, well flushing, flow inducing, drainage aiding, acidizing, and sidetrack drilling etc. but also as drainage-accelerating string and well completion string in oil/ gas production wells abroad. It is the first time to use coiled tubing as production string in China. The article describes the technical level to use coiled tubing at home and abroad, and that the coiled tubing, the coiled tubing unit, the operating window of suspension job, the well-head suspender of coiled tubing, the plug of coiled tubing, and the other matching tools and devices needed for gas recovery by water drainage with coiled tubing, and the job procedure. At last, it is stated the situations of the suspension job with coiled tubing and the test of gas recovery by water drainage for Well Zhang 13. The economic benefit is analyzed. Three ideas and suggestions are proposed for gas recovery by water drainage with coiled tubing.