Chelating Agent-Based Fluids for Optimal Stimulation of High-Temperature Wells

2002 ◽  
Author(s):  
A. Husen A. Ali ◽  
W.W. Frenier ◽  
Z. Xiao ◽  
M. Ziauddin
Keyword(s):  
High Temperature ◽  
Chelating Agent ◽  
Agent Based ◽  
Stimulation Of

Stimulation of High-Temperature Sandstone Formations From West Africa With Chelating Agent-Based Fluids

2008 ◽  
Vol 23 (01) ◽  
pp. 32-38 ◽  
Author(s):  
Syed A. Ali ◽  
Emee Ermel ◽  
John Clarke ◽  
Michael J. Fuller ◽  
Zhijun Xiao ◽  
...  
Keyword(s):  
High Temperature ◽  
West Africa ◽  
Chelating Agent ◽  
Agent Based ◽  
Stimulation Of

Stimulation of High-Temperature Sandstone Formations from West Africa with Chelating Agent-Based Fluids

2005 ◽  
Author(s):  
Syed Afaq Ali ◽  
Emee Ermel ◽  
John Clarke ◽  
Michael James Fuller ◽  
Zhijun Xiao ◽  
...  
Keyword(s):  
High Temperature ◽  
West Africa ◽  
Chelating Agent ◽  
Agent Based ◽  
Stimulation Of

Stimulation of High Temperature SAGD Producer Wells Using a Novel Chelating Agent (GLDA) and Subsequent Geochemical Modeling Using PHREEQC

2015 ◽  
Author(s):  
Z. Ouled Ameur ◽  
V.Y. Kudrashou ◽  
H.A. Nasr-El-Din ◽  
J.P.J. Forsyth ◽  
J.J. Mahoney ◽  
...  
Keyword(s):  
High Temperature ◽  
Geochemical Modeling ◽  
Chelating Agent ◽  
Stimulation Of

Mitigation of High Temperature Challenges in Limestone Acidizing through the use of Chelating Agents

2021 ◽  
Author(s):  
Mandeep Khan ◽  
Mohammed Qamruzzaman ◽  
Dhirendra Chandra Roy ◽  
Ravi Raman
Keyword(s):  
High Temperature ◽  
Chelating Agents ◽  
Elevated Temperatures ◽  
Chelating Agent ◽  
Point Of View ◽  
Core Flooding ◽  
Agent Based ◽  
Asphaltene Deposition ◽  
Wide Ph Range ◽  
Ph Range

Abstract Acid jobs with conventional acid systems like hydrochloric acid in high temperature conditions is challenging on various fronts. Enhanced reactivity of strong acids results in poor penetration and severe face dissolution. Also, it aggravates the issue of corrosion of downhole equipment and may also result in sludge formation/asphaltene deposition. Worldwide, chelating agents has emerged as a standalone stimulation fluid for high temperature acidizing. Their unique attributes and properties have been proved very useful for acid jobs at elevated temperatures. However, the chelating agents-based formulations need to be carefully evaluated on various acidization parameters for a fruitful stimulation. Mumbai Offshore field has been encountering the above-mentioned problems in acidizing of its high temperature (>275°F) limestone reservoirs. The paper presents innovative solutions devised for high temperature matrix acidizing. Two chelating agents viz., EDTA (Ethylenediaminetetraceticacid) and GLDA (L-Glutamic Acid N, N-diacetic acid) were explored and evaluated with meticulous laboratory studies. The performance of the chelating agent-based stimulation fluid was compared with acetic acid. Slurry tests were performed to quantify the dissolving power of each acid. Consequently, core flooding tests were carried out to to find the optimum pH of the chelating agents from stimulation point of view. Core flooding studies were performed at anticipated injection rates on representative core samples from a payzone A, with BHT 275-290° F, from Mumbai Offshore. pH optimized formulations were tested against N-80 metallurgy coupons at reservoir temperature for corrosion potential estimation. Also, sludge, asphaltene and emulsion formation tendencies were analyzed with representative oil samples. The results convey that both EDTA and GLDA were able to mitigate the challenges encountered at elevated temperatures. EDTA and GLDA were found to stimulate the cores with wormholes formed at wide pH range with no face dissolution observed. Chelating agents enjoyed good dissolving power with negligible corrosion rates, absence of sludge and asphaltene deposition, compatibility with formation fluid and excellent iron control properties.

Stimulation of High-Temperature Steam-Assisted-Gravity-Drainage Production Wells Using a New Chelating Agent (GLDA) and Subsequent Geochemical Modeling Using PHREEQC

2019 ◽  
Vol 34 (01) ◽  
pp. 185-200 ◽  
Author(s):  
Z. Ouled Ameur ◽  
Viacheslau Y. Kudrashou ◽  
Hisham A. Nasr-El-Din ◽  
Jeffrey P. J. Forsyth ◽  
John J. Mahoney ◽  
...  
Keyword(s):  
High Temperature ◽  
Geochemical Modeling ◽  
Chelating Agent ◽  
Gravity Drainage ◽  
Steam Assisted Gravity Drainage ◽  
Production Wells ◽  
High Temperature Steam ◽  
Stimulation Of

α1-Adrenoceptor-induced Mg2+ extrusion from rat hepatocytes occurs via Na+-dependent transport mechanism

2001 ◽  
Vol 280 (6) ◽  
pp. G1145-G1156 ◽  
Author(s):  
Theresa E. Fagan ◽  
Andrea Romani
Keyword(s):  
Adrenergic Receptor ◽  
Chelating Agent ◽  
Rat Hepatocytes ◽  
Channel Blockers ◽  
Inositol Trisphosphate Receptor ◽  
Intracellular Ca ◽  
A Cell ◽  
Dependent Transport ◽  
Trisphosphate Receptor ◽  
Stimulation Of

The stimulation of the α1-adrenergic receptor by phenylephrine results in a sizable extrusion of Mg2+ from liver cells. Phenylephrine-induced Mg2+ extrusion is almost completely abolished by the removal of extracellular Ca2+ or in the presence of SKF-96365, an inhibitor of capacitative Ca2+entry. In contrast, Mg2+ extrusion is only partially inhibited by the Ca2+-channel blockers verapamil, nifedipine, or (+)BAY-K8644. Furthermore, Mg2+ extrusion is almost completely prevented by TMB-8 (a cell-permeant inhibitor of the inositol trisphosphate receptor), 1,2-bis(2-aminophenoxy)ethane- N,N,N′,N′-tetraacetic acid (an intracellular Ca2+-chelating agent), or W-7 (a calmodulin inhibitor) Thapsigargin can mimic the effect of phenylephrine, and the coaddition of thapsigargin and phenylephrine does not result in an enlarged extrusion of Mg2+ from the hepatocytes. Regardless of the agonist used, Mg2+ extrusion is inhibited by >90% when hepatocytes are incubated in the presence of physiological Ca2+ but in the absence of extracellular Na+. Together, these data suggest that the stimulation of the hepatic α1-adrenergic receptor by phenylephrine results in an extrusion of Mg2+ through a Na+-dependent pathway and a Na+-independent pathway, both activated by changes in cellular Ca2+.

Well Clean-Up Using a Combined Thermochemical/Chelating Agent Fluids

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Mohamed Mahmoud
Keyword(s):  
High Temperature ◽  
Filter Cake ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Chelating Agent ◽  
Drilling Fluids ◽  
Gas Wells ◽  
Oil And Gas Wells ◽  
Different Types ◽  
Cake Removal

The well clean-up process involves the removal of impermeable filter cake from the formation face. This process is essential to allow the formation fluids to flow from the reservoir to the wellbore. Different types of drilling fluids such as oil- and water-based drilling fluids are used to drill oil and gas wells. These drilling fluids are weighted with different weighting materials such as bentonite, calcium carbonate, and barite. The filter cake that forms on the formation face consists mainly of the drilling fluid weighting materials (around 90%), and the rest is other additives such as polymers or oil in the case of oil-base drilling fluids. The process of filter cake removal is very complicated because it involves more than one stage due to the compatibility issues of the fluids used to remove the filter cake. Different formulations were used to remove different types of filter cake, but the problem with these methods is the removal efficiency or the compatibility. In this paper, a new method was developed to remove different types of filter cakes and to clean-up oil and gas wells after drilling operations. Thermochemical fluids that consist of two inert salts when mixed together will generate very high pressure and high temperature in addition to hot water and hot nitrogen. These fluids are sodium nitrate and ammonium chloride. The filter cake was formed using barite and calcite water- and oil-based drilling fluids at high pressure and high temperature. The removal process started by injecting 500 ml of the two salts and left for different time periods from 6 to 24 h. The results of this study showed that the newly developed method of thermochemical removed the filter cake after 6 h with a removal efficiency of 89 wt% for the barite filter cake in the water-based drilling fluid. The mechanisms of removal using the combined solution of thermochemical fluid and ethylenediamine tetra-acetic acid (EDTA) chelating agent were explained by the generation of a strong pressure pulse that disturbed the filter cake and the generation of the high temperature that enhanced the barite dissolution and polymer degradation. This solution for filter cake removal works for reservoir temperatures greater than 100 °C.

THE MULTILAYERED HIGH Tc SUPERCONDUCTORS; THE JOSEPHSON MODEL OF WEAK LINKS

1995 ◽  
Vol 09 (21) ◽  
pp. 2811-2820
Author(s):  
VALERY A. CHERENKOV
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
High Temperature Superconductors ◽  
Weak Links ◽  
High Tc Superconductors ◽  
Main Attention ◽  
Multilayered Structures ◽  
High Tc ◽  
Stimulation Of

The multilayered (N-S(D)-N)-types structures have been observed: there are the traditional Niobium low-temperature superconductors and new high-temperature superconductors. The main attention had been directed to the anisotropy, defectively and the stimulation of the superconductivity in the multilayered structures.

Sign in / Sign up

Export Citation Format

Share Document