Abstract
This paper illustrates the benefits of Dual ESP Dual Ytool Systems in Offshore wells where rig intervention costs are high & workover times are huge. It explains how such a completion model along with a Remote Monitoring system can considerably extend the production during the lifetime of a well where a gradual decline in productivity index is expected.
Dual ESP Dual Ytool completions are particularly suited for offshore wells where rig deployment takes time, rig costs are high, and the ESP replacement times last several weeks. Western offshore in India is one such field where a number of such completions have been done and proved to be successful.
The completion model consists of 2 Ytool systems along with 2 sets of ESPs’ where 1 system acts as a redundant system. Wide variation in flow rates is observed due to variation in the productivity index of the well, there is a need to select multiple models of pumps that can produce from the same well. Hence, a higher capacity ESP along with a bigger sized profile of Ytool is used for the upper system and a lower capacity ESP along with a lower sized profile of Ytool is used as a lower system.
At any point in time, only 1 ESP system will be in operation. The second set of ESP will act as a backup and will be operated only if the main ESP fails or if the well conditions change. A sensitivity analysis for all cases is performed to check for possible operating conditions during the design stage. Later on, during the operational stage, the performance is further fine-tuned using Novomet Track © (a remote monitoring system) which offers real-time ESP parameters along with features to check the pump operating point using the last recorded well production data.
