Temporary suspension of completed hydrocarbon wells

A process for suspending a subsea hydrocarbon well, wherein the process comprises:

• a) installing and completing a casing and a liner in the hydrocarbon well;
• b) running into the well a tubing string and hanging the tubing string from a tubing hanger in a wellhead;
• wherein the tubing string is fitted with a pre-installed upper glass plug and a pre-installed lower glass plug, wherein the upper glass plug and the lower glass plug each comprise an upper frangible barrier element and a lower frangible barrier element, wherein the upper frangible barrier element and the lower frangible barrier element are separated by a gap, wherein a pressure control channel opens into the gap at a first end, wherein the upper glass plug is breakable by a first predetermined sequence of pressure pulses and the lower glass plug is breakable by a second predetermined sequence of pressure pulses, wherein the first predetermined sequence of pressure pulses and the second predetermined sequence of pressure pulses initiate breaking of the upper glass plug and the lower glass plug, respectively, by changing the pressure between the respective upper frangible barrier and the lower frangible barrier of each glass plug, wherein the upper glass plug and the lower glass plug each have a selectively closable bypass channel in an open configuration, wherein the selectively closable bypass channel comprises a bypass closure valve, wherein the bypass closure valve of the upper glass plug is closable by means of a third predetermined sequence of pressure pulses and the bypass closure valve of the lower glass plug is closable by means of a fourth predetermined sequence of pressure pulses, and wherein no wireline intervention vessel is involved in the process for suspending the hydrocarbon well;
• c) performing pressure tests on the tubing hanger and other downhole components;
• d) removing a blowout preventer from the wellhead and installing a Xmas tree while the upper glass plug creates a seal in the tubing.