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Technical Paper: Successful Multistage Hydraulic Fracturing Treatments Using a Seawater-Based Polymer-Free Fluid System Executed From a Supply Vessel; Lebada Vest Field, Black Sea Offshore Romania

Society: SPE
Paper Number: 121204
Presentation Date: 2009
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Abstract

Offshore operations are extremely expensive because of the operational environment and the necessary infrastructure. In this environment emphasis is placed on high-efficiency operations based on tailored solutions combining available resources with new technologies. This results in a significant impact on operational efficiency by lowering costs and ultimately increasing hydrocarbon production.

To introduce greater efficiencies in offshore operations a horizontal openhole candidate well was selected to be equipped with a permanent completion system that would enable multiple fracturing treatments. Later, it was determined that by using a novel viscoelastic polymer-free surfactant-based fluid the entire operation could be performed in a single trip, adding additional savings to the process and improving efficiency.

Interpreted openhole images and advanced sonic logs were used to determine the optimum completion configuration and to select favorable fracture initiation points and treatment designs.  Because a specialized fracturing vessel tailored for operations in the Black Sea was not available, a supply vessel was used. It was necessary to rig up and secure the fracturing equipment on the deck of the vessel. To enable sufficient fracturing fluid volume for placing three propped fracturing treatments in a single pumping operation, a polymer-free fracturing fluid was formulated and mixed with seawater continuously. This was the first time this novel multistage fracturing system was used in Europe.

Results indicate a sustained increased production. Because of this success, additional wells are scheduled to be stimulated using the same approach.

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