High power lasers when applied to drilling is potentially capable of reducing the drilling time, improving well performance and exemption from the necessity to remove the cuttings.

In this paper, Rate of Penetration (ROP) and the specific energy (SE) required to remove the rock from Carbonate reservoir rock, Ahvaz#383-9 is measured using the Nd.YAG pulsed laser to identify the prospective laser application for drilling in South of Iran. The three samples selected from each depth and formation were the dry, water and oil saturated. The petrography studies of the rock samples were performed before and after the laser test to analyze any changes in the rock mineralogy and properties. SE was measured with different operational parameters comprising the laser beam and rock properties to detect their effect. This would help us to spot the optimum operational beam parameters with fixed rock properties to be adjusted to obtain minimum SE.

The results show SE increases with increasing laser radiation time and drilling depth non-linearly. SE corresponding to water saturated samples were higher than that of oil saturated and the SE of oil saturated were higher than that of the dry samples. ROP and SE showed to have a nonlinearly inverse relationship.

The optimum operational parameters determined, can help optimize the laser application in regards to obtaining the minimum SE. Future laser rock mechanical laser simulation softwares can be developed based on the experimental approach.

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