Saudi Arabian Oil Company

Fehead M Al-Subaie

Sanjiv Kumar

Surajit Haldar

Ahmed H Mahsoon

Abdulmajeed M Alotaibi

Abdullah M Bin Ziad

A system includes coiled tubing configured to be lowered into a well using a reel. A bottom-hole assembly is connected to a downhole-most end of the coiled tubing. A fail-safe valve is installed within the coiled tubing at a location up-hole from the bottom-hole assembly. A fluid is configured to flow within the coiled tubing. The fail-safe valve is configured to prevent the fluid from flowing in an up-hole direction and permit the fluid from flowing in a downhole direction.

Multiple fail-safe valves for safety of coiled tubing operations

An apparatus includes a dissolvable gauge cutter, a temperature sensor, and a pressure sensor. The dissolvable gauge cutter is made of a dissolvable alloy. The dissolvable gauge cutter is configured to be disposed within and travel through a tubular installed within a wellbore. The dissolvable gauge cutter is configured to dislodge solids from an inner wall of the tubular as the dissolvable gauge cutter travels through the tubular down to a specified depth within the wellbore. The dissolvable gauge cutter is configured to completely dissolve after reaching the specified depth. The temperature is configured to measure a temperature of a surrounding fluid as the dissolvable gauge cutter travels downhole through the tubular to the specified depth. The pressure sensor is configured to measure a pressure of the surrounding fluid as the dissolvable gauge cutter travels downhole through the tubular to the specified depth.

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Udhailiyah, Saudi Arabia

Fehead M Al-Subaie