Method for crossing wellhead of sleeve externally-applied optical cable and ground sealing system thereof

Abstract

The invention provides a method for crossing a wellhead of a sleeve externally-applied optical cable and a ground sealing system thereof. The method for crossing a wellhead of a sleeve externally-applied optical cable comprises: a sleeve external application optical cable entering a well along with a sleeve, and sitting on a sectioning slip; detaching a valve outer side flange on one side of the casing head, and reserving an inner side flange; lowering the traction steel wire to the inner side flange along the sleeve, and leading out the traction steel wire from the inner side flange; pullingthe traction steel wire up to lift the crossing optical cable to the drilling platform, and the crossing optical cable being connected with the casing external application optical cable through the optical cable connecting device; fixing the optical cable splicing device with the sleeve, removing the split slips, putting the sleeve into the well, and pulling the optical cable outwards at the innerside flange to pass through the optical cable; lowering the sleeve to a preset position, and sitting on the sectioning slip; installing a valve of an inner side flange, installing a ground sealing system, and connecting a crossing optical cable with a ground optical cable. The problems that in the prior art, a sleeve is difficult to penetrate through a wellhead of an externally-applied optical cable, and an outlet is not provided with a matched sealing protection device are solved.

Description

technical field [0001] The invention relates to the technical field of downhole optical fiber monitoring in oil and gas fields, in particular to a method for wellhead crossing of a casing coated optical cable and a ground sealing system thereof. Background technique [0002] The optical cable coated on the casing of the horizontal well can realize the real-time monitoring of the fracturing scale of each section (cluster) of the horizontal well and the post-fracture fluid production profile, which has important guiding significance for optimizing the design of the fracturing scheme and the dynamic analysis of the post-fracture productivity contribution rate. How to realize casing-coated optical cable crossing at the wellhead and seal the surface outlet to ensure the quality of optical fiber signal transmission is one of the key technologies for horizontal well casing-coated optical fiber downhole monitoring technology. Since this technology is still a cutting-edge technology f...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for crossing the wellhead of the casing-coated optical cable and its ground sealing system, so as to solve the problems in the prior art that the wellhead of the casing-coated optical cable is difficult to cross and there is no matching sealing protection device at the exit

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