After running velocity string tubing in four existing wells, Canada’s oil and gas player Trillion Energy is getting ready to restart operations following the receipt of equipment at a gas field offshore Türkiye and weather-related delays.
According to Trillion, the 2 3/8″ velocity string tubing was inserted in four existing wells, including three long-reach wells on the Akçakoca platform at the Black Sea’s SASB gas field. The aim was to reduce water loading and increase production and overall recovery from the wells. The oil and gas player expects the wells to be able to produce at a lower wellhead pressure (WHP) for a longer period thanks to the new strings.
The firm sees what it calls “steady improvement” since the production from Guluc-2 and West Akçakoca-1 was restarted following the velocity string installation as a confirmation of the program’s initial success in enhancing well performance. The two wells previously experienced production challenges causing downtime due to water loading with the previous tubing. Additionally, the daily water production at the Akçakoca-3 well is reduced.
The next stage of the operation entails running the velocity strings on two tripod wells and stimulating all the wells to clean up the producing reservoirs, build pressure, and increase production. This includes adjusting choke sizes to minimize water production and maximize gas production, as well as injecting nitrogen into wells to flush out water buildup as needed.
On December 11, the firm disclosed that the new wellhead arrived at the East Ayazli tripod in preparation for upcoming snubbing operations. This was followed by key equipment, including the tubing head spool and XMT, being transferred to the respective platforms for the Bayhanli-2 and Alapli-2 wells, which was shared two days later.
Additionally, the operations were delayed multiple times due to severe weather and the need to order additional equipment – burst discs, which arrived on December 22.
The Canadian firm kicked off velocity string operations at the field in October aiming to replace 4 1/2″ production tubing with 2 3/8″ tubing, described as a crucial step for ensuring long-term stable gas production and addressing water-loading issues. This was followed by the start of snubbing operations in November.
The velocity string program forms part of the second stage of the workover program intended to revitalize the field and sustain long-term natural gas production. Phase 1, which entailed perforation operations, was completed in mid-August.
