Shale Swelling Inhibition Properties of (Carboxymethyl)trimethylammonium chloride (CTAC) in Water-based Drilling Fluids

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Hosseini Seyyed Ehsan; Nowrouzi Iman; Shahbazi Khalil; Kamari Mosayyeb; Mohammadi Amir H.; Khaksar Manshad Abbas

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Journal Paper

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Journal: Journal of Petroleum Science and Technology Year:2024 | Volume:14 | Issue:1 Page(s): 43-56

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Title

Shale Swelling Inhibition Properties of (Carboxymethyl)trimethylammonium chloride (CTAC) in Water-based Drilling Fluids

Author(s)

Keywords

Drilling Fluid

Surfactant

Wettability

Contact Angle

Shale Swelling

Bentonite

Abstract

sequent Shale Swelling. In this study, we utilized Carboxymethyl Trimethyl Ammonium Chloride (CTAC) to inhibit Shale Swelling, representing a novel application for this particular cationic Surfactant. Several experiments were carried out to assess the effectiveness of CTAC in preventing Shale Swelling and to gain insights into the underlying mechanisms. Moreover, based on the results, CTAC is highly effective at low concentrations and can be used with other common additives. Furthermore, the Contact Angle in the presence of CTAC, cetyltrimethylammonium bromide (CTAB), and potassium chloride (KCl) at 1 wt.% in the Bentonite mixture was 77°, 75°, and 38°, respectively. Also, by adding CTAB, total shale recoveries in simple and complete drilling muds increased by 5.53% and 0.94%, respectively. Meanwhile, In the presence of CTAC, the increase was equal to 12.37% and 6.43%, respectively. In addition, CTAC and CTAB in the complete drilling mud reduced the swelling by 9.94% and 4.2%, respectively. Ultimately, comparative studies show that CTAC performs better as a new inhibitor than CTAB and KCl as conventional inhibitors.

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