DRILLING SYSTEM

摘要

A drilling system, comprising a ground control system (101), a coiled tubing (9) and a lower drilling tool (102), wherein a photoelectric composite cable (10) is arranged in the coiled tubing, and the photoelectric composite cable comprises a three-phase power cable (22), a power supply cable (23), a signal cable (24) and an optical fibre cable (25) therein; the ground control system comprises an injection head (8), a ground photoelectric converter (6), a PLC control module (2), a roller (7), a rectifier inverter (3), a booster transformer (5) and a ground information processing module (4); and the lower drilling tool comprises a connector (11), a cable head nipple (12), a non-rotating joint (13), a remote transmission nipple (14), an electric disconnection and circulation nipple (15), a drilling parameter measurement nipple (16), an inclination azimuth measurement nipple (17), an electric motor (18), an electric guiding nipple (19), a near drill bit measurement nipple (20) and a drill bit (21) which are connected in sequence. By injecting the photoelectric composite cable into the coiled tubing to establish a ground and underground well power and information passage, the drilling system overcomes the defects of the composite coiled tubing, and can achieve the electrification and intelligentization of drilling with the coiled tubing by mating the existing coiled tubing and the device.