1 Abstract The center of excellence concept is worldwide associated to new software, tools and technologies that help the team to pursue excellence in a particular area. The increasing use of sensors and gauges in the Oil and Gas field drove eni to develop internally the Center of Excellence for Electrical Submersible Pumps, to monitor and interact directly with the worldwide Business Units and to address the ESP issues. The tool and all the technologies behind had been developed by the Artificial Lift team, under the Completion Department, thanks to the strong effort of the IT Department in San Donato Milanese, Italy. The Center of Excellence (from now CoE) gives mainly the following information for each well: Pump details and operative parametersWell surface dataKey Performance Indicators All the data are collected in real time and the team can visualize any variables to perform a detailed analysis. The CoE system is a web-based tool that is available on the eni intranet, and provide the possibility to store well-related documentation. The most important advantage given by the CoE is the possibility to navigate through the KPIs, easily adaptable based on the field experience. One of the analyses possible in the CoE consists of comparison of the real-time pump intake and discharge pressures and the relevant simulated values retrieved from the Prosper model stored in the CoE system. In case of mismatch, a notification will be generated and will be sent to the technicians (via mail). Once the wells that are producing with KPIs out of the desired range have been identified, the Artificial Lift team can immediately take corrective actions. Presently the tool is fully operative for 20 wells in Alaska, and for 1 well in Italy and for 20 wells in Iraq and the process is ongoing to have other eni BUs online. Definitely the CoE could be helpful to optimize the operation and to analyze the wells in a smarter way than in the past.

The "Fully Retrievable" ESP System is a new technology, which permits the rigless deployment and retrieve of conventional Electrical Submersible Pump (ESP): a wire-line, coil-tubing or rod should perform these actions. This paper shows the eni experiences in this application and the approach used for the completion design according with the company policy highlighting the benefits and the criticalities faced. Two Fully Retrievable ESP were installed by eni in the following fields:Alaska - OP18-08 - Nikaitchuq Field - onshore arctic environmentCongo - FOKM 101 - Foukanda field - offshore. Each of them involved different issues and will be discussed in detail in the following sections. This paper goes all the way through the well definition, completion philosophy and ESP system selection exploring constraints and limitation of this equipment. An economical comparison was performed and the conclusion is that the retrievable ESP should be used in all of those fields where the workover cost is high and the deferred production is important due to rig unavailability. It will be presented that the main benefits of this technology include:Simple ESP retrieving with smaller environmental impactCapability to run temporary systems to clean up or test the wellFine tuning of the ESP based on production data. The benefits of the technology were tested using an internal eni tools for risk analysis based on Monte Carlo simulation: the results are discussed in the last part of the article and highlighted the above expressed consideration and main criticalities.

The Fully Retrievable ESP System Cable Deployed (CD) is a new technology which permits the rigless deployment of ultra slim OD Electrical Submersible Pump, able to reduce production loss while waiting for work over: these operations should be performed by a proprietary power and load carrying cable, and should be through tubing with the possibility to retrofit an existing completion. Based on previous Eni Partially Retrievable Experience, a R&D tender was launched among all ESP contractors interested to identify a complete rigless ESP solution. All technologies proposed were evaluated and Novomet was awarded the contract for the trial installation. Eni philosophy was to select the best candidate well which can be representative of the main criticalities of all Eni asset, in order to export the technology in the majority of operated fields. The scouting was performed among all Eni Geographical Business Units (GBU) and finally a well in Italy was selected to be the best candidate. The aim of the test was to install and operate the ESP for a short period of time, in order to validate the technology and diffuse it among the other GBU interested. It is important to highlight that the well selected is equipped with a Shallow Set Safety Valve, as common practices for ESP installation, so the R&D test will investigate also the functionality of the insert safety valve. The paper will describe all the steps needed to go further in a Rigless ESP installation project and all the lesson learnt that Eni can draw for the Oil & Gas Industry. The selected solution allows the retrofit option for the current shut-in wells, thus increasing the business opportunity for this type of technology. It is evident that each ESP solution (standard, partially or fully rigless) has pros & cons that will be discussed in the paper to guide the operator in the selection of the best possible option.

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