Volume 33 Issue 3
May  2016
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GAO Xiang, JIANG Jianfang, MA Feng, CAO Kexue, QI Jing. Analysis of the Potential of Generating Acid Sludge in the Dense Reservoir Formations in Block YD (Iran) and the Prevention of the Acid Sludge Generation[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(3): 107-111. doi: 10.3969/j.issn.1001-5620.2016.03.022
Citation: GAO Xiang, JIANG Jianfang, MA Feng, CAO Kexue, QI Jing. Analysis of the Potential of Generating Acid Sludge in the Dense Reservoir Formations in Block YD (Iran) and the Prevention of the Acid Sludge Generation[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(3): 107-111. doi: 10.3969/j.issn.1001-5620.2016.03.022
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Analysis of the Potential of Generating Acid Sludge in the Dense Reservoir Formations in Block YD (Iran) and the Prevention of the Acid Sludge Generation

doi: 10.3969/j.issn.1001-5620.2016.03.022
  • 1.

    Enhanced Oil Recovering Research Center, China University of Petroleum, Beijing 102249

  • 2. Basic Theory Research Team of EOR in Low Permeability Oilfield Application, Key Laboratory of Tertiary Oil and Gas Recovery, CNPC, Beijing 102249

  • Received Date: 2016-01-09
  • Publish Date: 2016-05-31
    Abstract
  • In reservoir stimulation operations, incompatibility between acids and crude oil leads to the formation of stable emulsions and acid sludge which cause the reservoir formations to be damaged. In analyzing the saturated hydrocarbons, aromatic hydrocarbons, gums and asphaltene components in crude oils obtained from the SV reservoir formation in Block YD, Iran, X-ray and ESEM have been used to study the constituents and micro structure of the reservoir rocks. Laboratory experiments have been performed to determine the compatibility between oil and new acids/pantothenic acids under in-situ conditions. A compound additive for use in acidizing operations has been developed with acid sludge inhibitor, Fe stabilizer and demulsifier. The oil sample taken has a CⅡ of 2.19, indicating the high potential of acid sludge generation. The reservoir rocks, on the other hand, are mainly calcite, having no or little clay components. The permeability of the reservoir rocks remained almost unchanged during water injection. The contact of oil sample with new acids and pantothenic acids generated acid sludge and stable emulsions. The existence of Fe3+ in the oil sample increased the amount of acid sludge generated, and the higher the concentration of Fe3+, the more the acid sludge generated. Addition of 1% demulsifier FTP-18, 0.5% sludge inhibitor FTZG-01 and 2% citric acid (Fe stabilizer), the amount of acid sludge generated was greatly decreased.

     

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