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Franco C.A.,Ecopetrol SA | Ricardo Solares J.,Udhailiyah | Al-Asiri K.S.,Udhailiyah | Al-Shammari N.S.,Gas Well Completion Operations Division | And 2 more authors.
Saudi Aramco Journal of Technology | Year: 2011

The historical trend leading to the selection and implementation of multistage fracturing technology as a fit-for-purpose technology to maximize productivity in long horizontal gas producers is presented. Post-stimulation results achieved in typical wells drilled and completed throughout the different development phases are shown. The initial development phase, based on drilling vertical producers through one or two reservoirs and bullheading massive acid fracturing treatments, was highly successful and cost-effective at the time when the development focus was on sectors of the field with the highest reservoir quality. A stage of closed fracture HCl acid with a 28% concentration is pumped at rates and pressures below the fracture gradient to increase the conductivity in the near wellbore at the end of the stimulation treatment. The next development phase, based on drilling single lateral open hole horizontal wells to achieve MRC and reduce the need for acid stimulation, was also highly successful. Successful stimulation treatments were sporadically performed in several instances, due to the introduction of state-of-the-art technologies, but it involved complex and costly operations. Results from the implementation of this strategy have been excellent in terms of increased well productivity. Source

Leal Jauregui J.A.,Udhailiyah | Malik A.R.,Gas Production Engineering Division | Solares J.R.,Udhailiyah | Nunez Garcia W.,Gas Production Engineering Division | And 3 more authors.
Saudi Aramco Journal of Technology | Year: 2011

A novel fiber laden, polymer-free, self-diverting acid system is introduced in Saudi Aramco as an acid fracturing diverter to control fluid leakoff, and enhance the diversion process by combining the aspects of both particulate and viscosity based diversion techniques. As the chemistry of this fluid does not contain iron-bearing components, use of this fluid is preferred in sour gas reservoirs over the conventional polymer based diverting acids. Due to the high efficiency of this system, the acid fracturing treatment fluid systems require smaller diverter fluid volumes, and therefore less fluid volume is loaded into the formation. Wells treated with the new fluid system consistently showed a significant reduction in the time required to achieve full well cleanout. The application of this technology has now become routine in acid stimulation treatments, attributed to the excellent results achieved since the start of its implementation. Source

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