Abstract Condensate banking has been identified as one of the most potential damaging mechanism affecting the well productivity in Cupiagua Field. This gas-condensate giant field has reached an average recovery factor of 42% with recovery values of ~60% in some layers of field. The mitigation of condensate banking phenomena, among the other important damaging mechanism currently interacting along the entire productivity zones, has been one of the most relevant stimulation practice in the development strategy. The mitigation of condensate banking led to optimize common stimulation practices to recover the productivity of gascondensate wells, massive hydraulic fracturing and matrix stimulation with inhibited diesel and alcohol have been the most common practices implemented and optimized to mitigate condensate banking in Cupiagua field. Since the field is being operated by ECOPETROL (Jun-2010), the mitigation of condensate banking was recognized as one of the most important stimulation challenges to be worked by stimulation team. The effective mitigation of condensate banking is a key to reach and even exceed the production targets set by ECOPETROL short and long term. This paper describes all the engineering work carried out to implement a new stimulation technique based on the injection of inhibited dry gas. The performed lab job, the simulation runs, the engineering design and the field results are clearly described in the paper, the preliminary results are showing that now we have available a successful stimulation technique to remove and mitigate condensate banking. At the moment this stimulation strategy has been focused in to remove liquid saturation (condensate and water) and organic solids (especially asphaltenes) by incorporating alcohol and surfactants inside the gas stream. Future engineering job will be addressed to find a chemical blend that can improve the gas-treatment life, probably reducing critical liquid saturation or/and reducing the size of no mobile condensate rings.
Tópico:
Hydraulic Fracturing and Reservoir Analysis
Citaciones:
11
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0
Información de la Fuente:
FuenteSPE International Symposium and Exhibition on Formation Damage Control