Monitoring downhole leaks

A method of determining a fluid leak of a tubing casing annulus of a well, the method comprising:

• receiving pressure information and depth information from three or more pressure sensors in fluid communication with a fluid of the tubing casing annulus;
• receiving at least three baseline pressure gradients;
• determining at least three current pressure gradients based on the pressure information and depth information of the three or more pressure sensors;
• determining pressure gradient differences between the at least three baseline pressure gradients and the at least three current pressure gradients;
• and
• determining whether any of the pressure gradient differences are above a pressure gradient threshold, and responsive to determining that at least one of the pressure gradient differences is above the pressure threshold, determining a fluid level of the fluid within the tubing casing annulus based on the pressure gradient differences by determining that the fluid level is between a first pressure sensor of the three or more pressure sensors and a second pressure sensor of the three or more pressure sensors when the pressure gradient difference based on the first sensor and the second sensor is above the pressure gradient threshold.

A method of determining a fluid leak of a tubing casing annulus of a well, the method comprising:

• receiving pressure information and depth information from three or more pressure sensors in fluid communication with a fluid of the tubing casing annulus;
• receiving at least three baseline pressure gradients;
• determining at least three current pressure gradients based on the pressure information and depth information of the three or more pressure sensors;
• determining a density of the fluid within the tubing casing annulus between each pair of the three or more pressure sensors based on the pressure information and depth information of the three or more pressure sensors;
• determining a fluid type of the fluid within the tubing casing annulus between each pair of the three or more pressure sensors based on the determined density of the fluid;
• determining pressure gradient differences between the at least three baseline pressure gradients and the at least three current pressure gradients;
• and
• determining whether any of the pressure gradient differences are above a pressure gradient threshold, and responsive to determining that at least one of the pressure gradient differences is above the pressure threshold, determining a fluid level of the fluid within the tubing casing annulus based on the pressure gradient differences.