Scale buildup in tubing
An operator in Thailand routinely reperforated its gas wells in the Platong field to enable producing lower-pressure sands as other intervals begin to deplete. However, CaCO3 scales frequently form in the tubing above the nipples, which prevents the perforating guns from reaching the zones of interest.
The operator’s early attempts to dissolve the CaCO3 scale involved using coiled tubing (CT) to place hydrochloric acid (HCl) downhole. This technique often had to be applied several times to completely dissolve the scale, and then a drift run had to be made to confirm adequate clearance for the perforating guns.
Efficient single-trip scale removal
Looking for a more effective scale removal alternative, the operator selected the Jet Blaster service to remove the scale before running the perforating guns. Jet Advisor* software was used to configure the Jet Blaster tool for maximum jetting efficiency and to take into account all the relative completion design parameters.