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Acidizing of carbonate reservoir is a challenge to find optimum acidizing operation. Therefore, one of the most importance use acid to remove the damage of the near wellbore in the hole of the well. The main objective of this study to estimate technology, efficiency of productivity index (productivity decreases during production) and stimulate non- working but productive intervals in Mauddud Formation. Much of the world's oil and gas almost from Limestone and Dolomite Formations. Dolomites are similar to Limestone in Mauddud Formation with the exception that they generally action more slowly with hydrochloric acid (HCL). The problems and damage resulting from Formation can be very severe. Reduced permeability (K) due to the mobilization of the Formation material can shut off production itself. Four wells were used and the results obtained after the candidate wells selection for stimulation jobs will help the company to select the wells based on the model they choose. This paper shows the results of different acidizing methods with (selective acid treatment with coiled tubing packer, emulsified two phase retarded acid system, and combination of single phase retarded acid system with selective acid treatment and coiled tubing packer) for carbonate reservoir. Therefore acidizing can be used to improve productivity of production wells to reach two to three time of production oil well. Result show that the selective acid treatment with coiled tubing packer was most method to improve oil production in Badra Filed. [ABSTRACT FROM AUTHOR]

The oil and gas are usually trapped inside the reservoir rock pores such as Limestones or Sandstone. Most of the oil and gas companies use the common method for calculating rock total porosity by using Helium (He) or Nitrogen (Ni) gas. But this technique is limited only in total porosity information of the limestone, not the petrophysical properties of the sample. Another powerful technique that can be used to investigate the internal structure of the rock is Neutron Imaging (NI). Several experiments related to NI about porous rocks have been done by another researcher, but an experiment about the reservoir rock properties with NI has not been done. Porosities are one of the most important parameters to predict the availability of oil or gas. X-Ray Imaging (XRI) was describing perfectly these porosities, but again the XRI only provide porosities information of the limestone. To surpassing this limit, NI was employed. NI does not limit only to visualize the rock porosity but also can distinguish inhomogeneities materials inside the limestone. In this paper, the Limestone sample has been investigated by employing tomography methods of both XRI and NI technique. The total porosity from both technique then compared by the java petroleum systems databased (conventional method). From the experiment knew that the total porosity of the Limestone was about 28.4%, 34.36%, and 30% - 36% by an XRI, NI and conventional method respectively. XRI detected all porosity including a traped pores, channel pores / interparticle, Intercrystalline and Vugular pores. It was known that there were a lot of channel pores inside the sample which made the oil flow in the centre of the stone while the crude oil extracted by the oil company. On the other hand, NI gives more information about inhomogenous minerals inside the Limestone belongs to Dolomite, Aragonite, Calcite, Magnesite, Ankerite, and Siderite. [ABSTRACT FROM AUTHOR]