科钻一井套管和钻进施工程序设计技术

套管程序和钻进施工程序设计遇到的主要问题是：1）1000m以深地层未知，地球物理方法用于结晶岩的效果差，推断的结果可信度低，进行套管程序设计缺乏依据；2）要求5000m全部取心钻进，选择合理的取心钻进施工程序成为难题。为此，在借鉴世界上主要硬岩深井取心钻进项目设计的先进思想和宝贵经验的基础上，制定了一种“灵活的双孔钻进”方案，其要点是：1）全井采用一种直径（小直径）取心钻进；2）预先不确定套管程序，钻进中视地层稳定情况扩孔下套管；3）按照双孔（先导孔＋主孔）设计，钻完先导孔后再根据情况决定是扩孔钻主孔，还是移井位钻主孔。在分析该井套管和钻进施工程序难点的基础上，介绍了采取的“超前孔裸眼钻进方法”，给出了8种套管和钻进施工程序。

Casing Program Design and Drilling Operational Procedure in Well CCSD-1

The main problems encountered while drawing up the casing program and drilling procedure are: 1) Because the rock formation below 1 000 m is unknown, and the poor results from geophysical method used in crystalline rock formation make it hard to draw up casing program for the project. 2) There are challenges in making a continuous coring drilling program for a 5 000 m deep well. Based on advanced design concept and experiences of the main scientific deep drilling projects in the world, a special plan named flexible double-hole drilling program has been drawn up. The main points of the program are as follows: 1) Only one diameter for coring the whole well is considered. 2) The casing program for the well is subject to borehole stability and hole reaming. 3) A double-hole (Pilot Hole + Main Hole ) drilling plan will be drawn up. Considering the drilling results of the completed pilot hole, the main hole will be drilled by reaming the pilot hole or by drilling a second hole. On the basis of analyzing challenges of running the casing and drilling operations, the super-pilot open-hole drilling method is presented, and eight sets of casing and drilling program are introduced.