The Use of Specialized Cement to Ensure Long Term Zonal Isolation for Sour Wells in South Oman

Eldin, Yasser Fakhr; Irvine-Fortescue, Jamie; Grieve, John; Taoutaou, Salim; Jain, Bipin; Kalbani, Sultan Al; Thery, Frederic

doi:10.2523/13400-ms

Cited by 5 publications

(1 citation statement)

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“…Cases of high temperature HT iron sulfide are documented in sour gas wells producing from the Khuff formation (Ghawar field) [Leal 2007]. Other deep, sour gas developments in the Middle East will likely face similar issues [Abed 2010;Fakhreldin 2009;Sorem 2008]. …”

Section: Introductionmentioning

confidence: 99%

Removing Iron Sulfide Scale: A Novel Approach

Yap

Fuller

Schafer

et al. 2010

Abu Dhabi International Petroleum Exhibition and Conference

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Iron sulfide is a common scale-formation in sour-gas wells that restricts tubular diameter, reducing well productivity. Compared to other scales, iron sulfide has unique risks associated with chemical removal. For example, due to the corrosiveness of hydrochloric acid (the most common chemical agent for both sulfide and carbonate scale removal), damage to the completion metallurgy at elevated temperature limits its applicability. Another main concern related to the use of acid for iron sulfide removal is the rapid generation of H 2 S byproduct and the risks associated with production of this toxic gas to the surface.Owing to H 2 S toxicity and the resultant elevated corrosion risk, new chemical solutions are needed for high-temperature FeS scale dissolution with low H 2 S generation. This study describes the development and characterization of a powerful noncorrosive solution for iron sulfide removal based on a chelating agent. Testing shows the fluid dissolution capacity under varied temperatures, scale-surface area, treatment fluid volume, and exposure time. Tests are also included showing the comparative benefits in dissolution capacity compared to other commercially used products such as diethylenetriaminepentaacetic acid (DTPA) and Tetrakis (hydroxymethyl) phosphonium sulfate (THPS). Finally, the mild-pH of the new chemical solution provides significantly lower corrosion rate.This work describes an altogether new family of chemicals for sulfide scale, providing high dissolution capacity, low corrosion rates, and limited generation of toxic H 2 S.

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Section: Introductionmentioning

confidence: 99%