DUAL BOOSTING ESPs COMPLETION: DESIGN PHILOSOPHY AND EXPERIENCE GAINED IN TEMPA ROSSA.

摘要

Tempa Rossa is an oil field within Gorgoglione Concession in Basilicata region, Italy, discovered in 1989. Lying more than 4,000 meters beneath the surface, the field is planned to be produced with height wells. One of six existing well has a total depth around 7145mMD, and another well has a horizontal drain around 600m. Dual Boosting ESP system is the selected solution to deliver 10 000 blpd per well as production target rate. The ESP and completion string were designed considering the limited size of production casing, the high stresses (tubing movement, tension, weight, pressure) and the corrosive environment from the oil characteristics. According to the casing size, two completion designs were created to deploy the dual boost system (type A for 9-5/8” production casing and type B for 7-5/8” casing). The ESPs can be operated as single, back-up system, or as dual boost system. For the first production years, the ESP will be used in back up mode, thanks to high reservoir pressure, and then subsequently with declining reservoir pressure, the dual boost system will be operated to maintain the required flow. A Work-Over campaign started in March 2016 with the objective to equip the six existing wells with new upper Dual ESP completion in anticipation of the first oil. Under abstract submission’s date, four of the six Tempa Rossa wells have been equipped with Dual ESP completion: three type A and one type B. Significant improvements in running performances have already been observed thanks to the dedicated operation follow-up. A post ESP installation data monitoring has been put in place, thru a dashboard, to allow the detection of potential early failure of the Dual ESP system during the idle period until production start-up. Operation follow-up and data monitoring are key factors to minimize the probability of ESP failure prior to the first oil. Mitigation measures for ESP preservation during long period play a key role to accomplish first oil and planned ramp-up in due time.