大汶口盆地岩盐对接井钻探施工工艺研究

Study on drilling technology for rock-salt solution well intersection in Dawenkou Basin

摘要:

大汶口盆地蕴藏着丰富的岩盐资源，岩盐矿矿层埋深较深，上覆地层为古近系巨厚的松散泥岩、砂岩,易发生遇水软化，施工难度较大。山东肥城海晶盐化有限公司实施100万t/年卤折盐采输卤工程，实施卤井7组，每组井深约3000 m。定向对接井要求精准定点造斜、连续造斜。本文介绍了对接井施工中采用的关键施工工艺及MWD无线随钻测斜仪在定向钻进中进行钻井轨迹控制的应用实例。对如何在岩盐地层钻进、螺杆钻具应用、定点造斜等关键技术措施进行了详细阐述，以期为同类型卤水对接井项目施工中提供参考。

Abstract:

Dawenkou Basin is rich in rock salt resources which are deeply buried. The overlying strata are loose mudstones and sandstones of Paleogene, which are easy to soften in water and difficult to drill through. Shandong Feicheng Haijing Salinization Co., Ltd. implemented a one million ton/year brine recovery and transmission project with seven units of brine supply wells, each with depth of about 3000m. Well intersection requires high-precision kick-off and continuous build-up. This paper introduces a field case where the key drilling technology for well was used for well intersection, and the MWD system for directional trajectory control with detailed description on how to drill in rock salt formation, the application of mud motor drilling tools, kick-off from the fixed-point and other key technical measures so as to provide reference for brine supply well intersection drilling.