Orientation locking perforation monitoring device for optical cable outside underground casing and control method

Abstract

The invention discloses a downhole casing external optical cable orientation locking perforation monitoring device, which comprises a cable joint, a rotary short section, a magnetic positioning short section, an anchoring instrument and an orientation locking instrument, and is characterized in that the cable joint, the rotary short section, the magnetic positioning short section, the anchoring instrument and the orientation locking instrument are sequentially connected; a perforating gun is arranged at the tail end of the orientation locking instrument; wherein power mechanisms are arranged in the anchoring instrument and the direction locking instrument. The rotation is driven by power supply, so that the supporting arm of the anchoring instrument is driven to open, and the instrument string is anchored on the sleeve without moving and rotating. And a motor in the orientation locking instrument rotates to drive the lower optical cable detection device to rotate, and the position of the optical cable is judged by transmitting and receiving electromagnetic wave signals, so that the perforation position in the opposite direction is determined.

Description

technical field [0001] The invention relates to the technical field of petroleum logging, in particular to an azimuth locking perforation monitoring device and a control method of an optical cable outside a downhole casing. Background technique [0002] In the process of oil drilling, it is necessary to monitor downhole data, mainly for long-term monitoring of temperature and pressure for wells in some key blocks, so as to serve as a reference when drilling other wells. [0003] At present, the most advanced technology in China is to fix the optical cable on the outer end of the outer optical cable of the sleeve and set up temperature and pressure sensors. In the process of running the casing, the optical cable is fixed on the outer wall of the casing and lowered to the reservoir, and then the optical cable and the casing are fixed by cementing. In the subsequent operations, the casing needs to be perforated, some need to be fracturing, and then the purpose of increasing pr...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary for perforation operation, which leads to the risk of breaking the optical cable during perforation. At this time, the optical cable cannot be repaired again, so special monitoring equipment is required to monitor the specific position of the optical cable during perforation.

At present, the development of such instruments in the domestic market is in the early stage, and the basic tests are basically imported with original packaging. It is not yet mature, and there is no device to ensure that the optical cable will not be damaged.

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