Flexible drilling tool system for radial drilling of ultra-deep well and sidetrack drilling process

• Main Authors: XU KELIANG, ZHANG JIE, WU CHUNHONG, LONG WU, MA GUORUI, WAN XIAOYONG, SONG HAI, TAO SHAN, ZHAI KEJUN, LI WEILIANG
• Format: Patent
• Language: Chinese; English
• Published: 13.01.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention provides a flexible drilling tool system for radial drilling of an ultra-deep well, and the flexible drilling tool system comprises a drill rod which is connected with a wellhead turntable arranged at a wellhead; the drilling device is connected to the lower end of the drilling rod, and the drilling end of the drilling device is connected with a lower drilling tool; the flexible drilling tool module is connected between the drilling device and the lower drilling tool; wherein the flexible drilling tool module has an initial deflection angle, the flexible drilling tool module is configured to enable the flexible drilling tool system to turn a well track from vertical to horizontal within a preset vertical distance range, and the drilling rod is driven to rotate through the wellhead rotating disc; and the flexible drilling tool module can rotate along with the wellhead turntable through the drilling rod so as to drive the lower drilling tool to operate. The invention further provides a sidetrack d