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Title

An Experimental Study of Acid Diversion by Using Gelled Acid Systems Based on Viscoelastic Surfactants: A Case Study on One of Iran Southwest Oilfields

Year: 1398
COI: JR_IJOGST-8-1_003
Language: EnglishView: 211
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Authors

Abdorrahman Mehri Ghahfarrokhi - Technical Expert, Iranian Offshore Oil Company, Tehran, Iran
Ezzatollah Kazemzadeh - Assistant Professor, Research Institute of Petroleum Industries (RIPI), Tehran, Iran
Hassan Shokrollahzadeh Behbahani - Assistant Professor, Department of Petroleum Engineering, Petroleum University of Technology, Ahwaz, Iran
Gholam Abbas Safian - Senior Technical Expert, National Iranian South Oil Company, Ahwaz, Iran

Abstract:

In matrix acidizing operations, the main goal is increasing permeability. For production engineers, it is desirable that acid could be injected into whole [M.N.1] [amehri.gh2] pay zone. Sometimes, this pay zone has a long height and various sub-layers which have different permeability values. To prevent acid from going completely into the most permeable sub-layer, one of the useful techniques is using diverters, and one of the major groups of diverters is gel diverters. Diverter viscosity changes by temperature and pH, and an increase in viscosity leads to a decrease in its permeability; thus, acid can permeate further through less permeable sub-layers. In this study, two kinds of different viscoelastic surfactants (VES) provided by two different companies were used to produce gel to divert acid into a core plug sample having lower permeability in a dual parallel acid injection set-up. The core plug samples were taken from the pay zone of Ahwaz oilfield, one of Iran southwest oilfields. Before performing the injection test, some viscosity measurement tests were carried out. Unfortunately, one of these two VES’s did not have an acceptable quality and failed to pass the injection tests. However, the other one passed all the tests successfully and diverted the injection fluid. The water permeability values of the low-perm and high-perm core plug samples were 0.91 md and 6.4 md respectively, whereas, after injection, they rose to 1.5 and 18.5 md respectively.

Keywords:

Carbonate Acidizing, Multi-layered Reservoirs, Diverters, Gels, Viscoelastic Surfactants

Paper COI Code

This Paper COI Code is JR_IJOGST-8-1_003. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/896174/

How to Cite to This Paper:

If you want to refer to this Paper in your research work, you can simply use the following phrase in the resources section:
Mehri Ghahfarrokhi, Abdorrahman and Kazemzadeh, Ezzatollah and Shokrollahzadeh Behbahani, Hassan and Safian, Gholam Abbas,1398,An Experimental Study of Acid Diversion by Using Gelled Acid Systems Based on Viscoelastic Surfactants: A Case Study on One of Iran Southwest Oilfields,,,,,https://civilica.com/doc/896174

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