Development of Selective Acidizing Technology for an Oil Field in the Zechstein Main Dolomite

Marek Czupski, Piotr Kasza and Łukasz Leśniak
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Marek Czupski: Oil and Gas Institute—National Research Institute, 25A Lubicz str., 31-503 Krakow, Poland
Piotr Kasza: Oil and Gas Institute—National Research Institute, 25A Lubicz str., 31-503 Krakow, Poland
Łukasz Leśniak: Brenntag Polska, Jana Bema 21 str., 47-224 Kędzierzyn Koźle, Poland

Energies, 2020, vol. 13, issue 22, 1-18

Abstract: This paper presents laboratory studies based on which a stimulation technology for an oil field located in the Zechstein Main Dolomite was investigated. A large number of oil wells in the Main Dolomite produce significant amounts of reservoir water. Matrix acidizing using conventional acid solutions in such wells has caused a significant increase in water cut, because of their affinity for water. The purpose of this cooperation between the Oil and Gas Institute–NRI and the Brenntag Polska was to develop an acid treatment technology that would not increase the water cut after acidizing treatment in wells where oil production is accompanied by the production of reservoir water. Therefore, a series of tests were performed, including the selection of a suitable viscoelastic surfactant that was sensitive to crude oil. The contact of the gel of the viscoelastic surfactant fluid with crude oil resulted in the reduction of its viscosity The tests described herein include dissolution/dispersion tests, rheological tests, acid sludge tests, compatibility tests, core flow experiments, and corrosion tests, which allowed recipes to be developed for the preflush, diverter, and acidizing liquid. Then, recommendations were established for using these liquids in matrix acid treatment. A series of treatments performed according to this technology allowed the removal of near-wellbore damage without increasing the water cut.

Keywords: matrix acidizing; viscoelastic surfactant; fluid composition; dolomite formation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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