双层套管高效快速分叉技术研究及应用

针对双层套管开窗侧钻井分叉难度大、开窗效率低、常规工具不适应等现状，研制了新型高效快速分叉导向
式开窗工具；采用硬对硬设计理念，实施双角度超硬复合斜面导向、双切削刃强侧切开窗钻头和三缸联动加压非循环
坐封新技术；在切削过程中，大大降低了导斜体的损伤程度，增强了非对称性、非稳定性和形态随机性所形成的断续切
削工况的适应性和可靠性，有效地提高了分叉角，在文25 侧61 井应用获得成功。同时，对该双层套管井窗口形成机
理进行了现场跟踪调研和静动态仿真，在此基础上进一步阐述了实现双层套管高效侧钻的技术途径，并对侧钻市场的
后续发展有着重要的借鉴意义。

Research and Application of Fast and Efficient Bifurcation Technology of Dual Casing

Aiming to solve problems like difficulty in low efficiency in opening the window and ill adaptability of conventional
sidetracking tools，we developed a new type of fast and efficient bifurcation and pilot type sidetracking tools，using“hard to
hard”design idea，an implementing new technologies of dual-angle superhard compound bevel guide，double cutting edge and
strong lateral cutting ability of sidetracking bit，and triplex-cylinder linkage pressurized and non-cyclical packer. In the cutting
process，greatly reduced the extent of damage to whipstock，enhanced the adaptability and reliability of intermittent cutting
conditions caused by the asymmetry，non-stability and the form-randomness，effectively improved the bifurcation angle，and
applied it to be successful in the Wen25Ce61 well. At the same time，the window formation mechanism of the dual cased hole
was done，and static and dynamic simulation were made. On this basis，further we elaborated technical methods to achieve
efficient dual casing sidetrack. This research is hoped to have great significance to the future development of the sidetrack
market.