TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn the last two decades, it was usual practice in the oil industry to carry out massive hydraulic fracturing works to stimulate wells with great-heighten layers of interest and/or low permeability sands.Argentina has had no opportunity so far to make a stimulation work of this type, mainly because of the absence of a layer meeting the principal characteristics needed to carry out a job of this size, considering the lack of equipment required by a service company to face the magnitude of the work in question.In the year 2000, Pan American ENERGY, a BP Amoco subsidiary, made exploratory works on a sand formation of interest that met the adequate characteristics to try and develop this kind of job. This paper shows how operator and service company designed this treatment in a team work and how this job was accomplished and came to be the largest stimulation treatment successfully done in Argentina to date. This kind of jobs can open a new way to handle tight gas zones in Argentina.

Hocol Colombia operates in Ocelote field at the eastern part of Colombia, a land called as Llanos Orientales (Eastern Plains). In this field Hocol produced from Carbonera formation observing problems with formation deconsolidation. Normally, gravel packs jobs are performed on vertical wells with sustained good results. However, new reservoir studies showed that horizontal wells with regular length extension (around 1000 ft) would be more profitable for this field. In order to get this objectives, Hocol design a horizontal wells Program to drill and test alternatives to get good completion of these wells. The first well was completed and gravel packed using conventional technologies and a 35% of pack efficiency was achieved. The objective for the second well was to get at least 75% of packing efficiency. In a synergetic team effort, service companies proposed operator company new technologies that are used in other places but never were applied in Colombia. After simulations and technical meetings, the Operator decided to test two new technologies to try to get their operative and technical objective. This paper presents the technical and operative fundamental used to support these changes and the results obtained with theses applications.