CAJ | 학술논문

在LG地区高研磨性含气层段的须家河组实施氮气钻井是提高机械钻速,保护油气层,有效避免燃爆事故的发生, 促进该地区勘探开发进程的关键.为此,在多口氮气钻井实践的基础上,总结了在该层段运用氮气钻井时的设备配套、施工技术难点与处理对策:①在钻井过程中要控制钻时钻进(大于5 min/m),防止沉砂卡钻;②出现挂卡严重时,控制上提钻具吨位活动钻具,保持循环,待环空循环通道畅通后再调整钻具活动范围,直至解卡.上三叠统须家河组氮气钻井的成功实施,表明氮气钻井提高了机械钻速,也解决了含气层段空气钻井的燃爆问题.
재LG지구고연마성함기층단적수가하조실시담기찬정시제고궤계찬속,보호유기층,유효피면연폭사고적발생, 촉진해지구감탐개발진정적관건.위차,재다구담기찬정실천적기출상,총결료재해층단운용담기찬정시적설비배투、시공기술난점여처리대책:①재찬정과정중요공제찬시찬진(대우5 min/m),방지침사잡찬;②출현괘잡엄중시,공제상제찬구둔위활동찬구,보지순배,대배공순배통도창통후재조정찬구활동범위,직지해잡.상삼첩통수가하조담기찬정적성공실시,표명담기찬정제고료궤계찬속,야해결료함기층단공기찬정적연폭문제.
The application of nitrogen drilling at the highly abrasive gas-bearing Xujiahe Formation of the LG area is critical for the ROP improvement, reservoir protection, prevention of downhole explosion, and for further exploration and development in this area. Hereby, according to the practices and experiences from the nitrogen drilling in this formation on many wells, we summarized the equipments used, the technical challenges encountered, and the measures adopted as follows: 1) the drilling rate should be controlled to be over 5 min/m in order to avoid sticking; 2) if serious sticking occurs, work the drill string at a controlled pull force, and keep circulating continuously till no obstruction in the annulus, then readjust the work distance of the drill string in order to free it. The successful application of nitrogen drilling at the Xujiahe formation has proved that nitrogen drilling can not only improve the ROP effectively, but avoid downhole fires or explosions when drilling through gas zones with air.