For several decades, the most commonly used hydraulic fracturing fluids have been water based, and used a variety of different polymers. The effects of such fluids on formations, and even on the frac pack as such, have constituted the basis for several papers and discussions. Several of these discussions were focused mainly on the efforts devoted to the optimization of the interaction between the frac fluid and the formation. Among others, the probable polymer damage brought about by the frac fluid is one of the most frequently discussed topics.

Undoubtedly, the use of a polymer-free frac fluid, surfactant based with viscous-elastic (VES) properties, has been one of the most attractive topics for Pemex E&P within its application program of new technologies.

The present document includes a detailed explanation of the properties of this fluid, including the description of its mechanism for the generation of viscous-elastic properties and the breakage thereof, as well as its general chemistry.

In addition, the application of these kinds of fluids had been contemplated within PEMEX E&P´s plans, to be used in Chicontepec basin.

This formation is regarded as heterogeneous and highly complex. The only way to produce the wells at economically acceptable levels is through the technique of hydraulic fracturing.

The first work done with this technology was carried out during 2005, and it was deemed a success by the producing company. The description of the well, in which the fluid was used, together with all of the relevant information thereof, has been included in the present document. An assessment of the early production and well response was carried out through a nodal analysis and a simulator of the responses related to production rates, both linked to a fracturing simulator. These too will be discussed in this paper.

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