Novel Cake Washer for Removing Oil-Based Calcium Carbonate Filter Cake in Horizontal Wells

Osama Siddig, Saad Al-Afnan, Salaheldin Elkatatny and Mohamed Bahgat
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Osama Siddig: College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia
Saad Al-Afnan: College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia
Salaheldin Elkatatny: College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia
Mohamed Bahgat: Rosewell Energy Company, 327 El-Horreya Road, Cleopatra, Alexandria 21500, Egypt

Sustainability, 2020, vol. 12, issue 8, 1-12

Abstract: An impermeable layer “filter cake” usually forms during the overbalanced drilling technique. Even though it helps in protecting the formation from a further invasion of drilling fluids, the removal of this layer is essential for a proper cement job and to avoid any reduction in wellbore deliverability. The design of the removal process is complicated and depends on the filter cake composition and homogeneity. This paper presents an experimental evaluation on the usage of a novel cake washer (NCW) in the removal of a filter cake formed by an invert emulsion oil-based drilling fluid that contains calcium carbonate as a weighting material while drilling a horizontal reservoir. The proposed NCW is a mixture of organic acid, mutual solvent and nonionic surfactant. It is designed to enable restored wellbore permeability for a sustainable production. Since the filter cake mainly consists of the weighting material, the solubility of calcium carbonate in NCW at different ranges of temperature, duration and concentration was investigated. An actual casing joint was used to test the corrosion possibility of the treating solution. High-pressure and high-temperature (HPHT) filtration tests on ceramic discs and Berea sandstone core samples were conducted to measure the efficiency of the filter cake removal and the retained permeability. Ethylene glycol mono butyl ether (EGMBE) was used as a mutual solvent and the solubility was higher compared to when the mutual solvent was not used in the washer formulation. A significant increase in calcium carbonate dissolution with time was observed for a duration of 24 h. The solubility was found to be proportional to the concentration of NCW with optimum results of 99% removal at a temperature of around 212 °F. At those conditions, no major corrosion problems were detected. Permeability of the core retained its pristine value after the treatment.

Keywords: calcium carbonate; filter cake; oil-based mud; cake washer; retained permeability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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