连续油管长水平段防自锁技术  

Anti-self-locking technology for long horizontal section of coiled tubing

作　　者：王方祥 张乾 姜有才 郝华松 杨鑫 李道松 WANG Fangxiang;ZHANG Qian;JIANG Youcai;HAO Huasong;YANG Xin;LI Daosong(Downhole Technical Service Branch,CNPC Bohai Drilling Engineering Company,Tianjin 300280,China;Well Testing Branch,CNPC Bohai Drilling Engineering Company,Langfang,Hebei 065007,China)

机构地区：[1]中国石油集团渤海钻探工程公司井下技术服务公司,天津300280 [2]中国石油集团渤海钻探工程公司油气井测试分公司,河北廊坊065007

出　　处：《油气井测试》2021年第2期25-29,共5页Well Testing

基　　金：中国石油集团渤海钻探工程有限公司重大工艺研究项目“页岩气长水平段连续油管压裂前作业技术及套变防治研究”(2019ZD18K-04)。

摘　　要：连续油管在长水平井段施工时,经常因螺旋变形而自锁,无法下到预定位置,严重影响施工进度和施工质量。为解决连续油管在长水平井段自锁的问题,利用弹簧蓄能和齿形交错结构,设计了频率可调、振动稳定、适用性强的机械振荡器,研发了新型金属降阻剂配方,总结了矿化度、pH值、温度等对摩擦系数的影响规律,形成连续油管在长水平井段推进的防自锁技术。应用于N×-3井连续油管钻塞施工中,机械振荡器振动频率25~37 Hz,金属降阻剂最佳浓度1.0%~1.5%,降低摩擦系数40%以上。机械振荡器与金属降阻剂共同使用,可降低连续油管与井壁之间的摩擦力,增加其在水平井段的推进深度,缩短连续油管施工周期,提高施工质量。Coiled tubing is often self-locking due to spiral deformation when operation in long horizontal sections of horizontal wells,and cannot reach the predetermined position,which seriously affects the operating progress and quality.In order to solve the self-locking problem of coiled tubing in long horizontal sections,a mechanical oscillator with adjustable frequency,stable vibration and strong applicability was designed using spring energy storage and tooth-shaped staggered structure,and a new type of metal resistance reducer formula was developed.The influence of salinity,pH value,temperature,etc.on the friction coefficient was summarized.An anti-self-locking technology for coiled tubing was founded during advancing in long horizontal sections.The technology was applied to the plug drilling operation with coiled tubing of Well N×-3.The vibration frequency of the mechanical oscillator was 25-37 Hz,the optimal concentration of metal resistance reducer was 1.0%-1.5%,and the friction coefficient was reduced by more than 40%.The combination of mechanical oscillator and metal resistance reducer can reduce the friction between the coiled tubing and the wellbore,increase its advancement depth in the horizontal section,shorten the coiled tubing operating period,and improve the operating quality.

关 键 词：水平井段 连续油管 自锁 机械振荡器 金属降阻剂 摩擦系数 现场应用 

分 类 号：TE357[石油与天然气工程—油气田开发工程]