On the Way to Chemically Remove the Filter Cake Generated by Ilmenite-Based Drilling Fluids | Chapter 4 | Current Topics and Emerging Issues in Chemical Science Vol. 2

 Ilmenite is frequently used as a weighting power in drilling fluids to increase the fluid mass, but the formation of a filter loaf on the borehole wall can impact cementing movements and reduce well productivity. To erase the filter loaf, various techniques maybe employed such as synthetic treatments, mechanical designs, or a combination of two together. The goal of this study search out evaluate the effectiveness of synthetic removal of ilmenite-located filter cake utilizing 7.5 wt.% hydrochloric acid (HCl) and hydroxyethyl ethylenediamine triacetic acid (HEDTA) – chelating agent. The filter loaves were generated using API dribble press under harsh environments of 300 psi pressure and 250°F temperature. Sandstone cores (2.5-in. diameter and 1-in. girth) were utilized to replicate the establishment during filtration experiments. The filtrate fluid was composed and the sandstone cores accompanying filter cakes were scoured using computerized tomography (CT) science. Immediately after that, the cores and filter loaves were soaked accompanying HCl–HEDTA solution for 6 hours, followed by CT-thumbing through the cores and remaining filter loaves again. After acidizing, the discharge solution was analyzed utilizing inductively coupled plasma (ICP). Scanning power microscopy–energy dispersive spectroscopy (SEM-EDS) was used to analyze the dried percolate cakes and surplus residue. The results showed that, the use of 7.5 wt.% HCl was direct in partially removing the ilmenite-located filter cake. Additionally, the use of HEDTA demonstrated limited effect on the effectiveness of filter cake eviction, but it effectively prevented disintegration problems all along the treatment. This study presents useful judgments on removing ilmenite-based clean cake with a depressed acid concentration and lowering the risk of corrosion issues.

Author(s) Details:

Jianping Su,
Department of Biotechnology, The University of British Columbia, Canada.

Omar Mahmoud,
Department of Petroleum Engineering, Future University in Egypt (FUE), Egypt.

Hisham A. Nasr-El-Din,
Harold Vance Department of Petroleum Engineering, Texas A&M University, USA.

Please see the link here: https://stm.bookpi.org/CTEICS-V2/article/view/11530