American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc.

Abstract

IRONITE SPONGE is a significant new product specifically formulated to scavenge hydrogen sulfide from drilling, completion and workover fluids. The material is believed to be unique both in terms of its composition and its reaction with H2S. Because of this it can result in a level of safety not now possible using any other method of possible using any other method of treatment. When added to the drilling, completion or workover fluid in recommended concentrations it is capable of eliminating the danger to personnel, equipment and the environment even when a high pressure, low volume feed-in containing high H2S concentrations is encountered and this even if high strength drill pipe is in use!

This is possible because IRONITE SPONGE reacts on contact with H2S to form mainly FeS2, pyrite, which is safe and stable. The reaction appears to instantaneous, complete and irreversible and the efficiency is directly proportional to bottom hole pressure. proportional to bottom hole pressure

Introduction

Hydrogen sulfide, commonly referred to as rotten egg gas, is deadly poisonous. Concentrations above 600 poisonous. Concentrations above 600 ppm can be fatal in 3–5 minutes, Table ppm can be fatal in 3–5 minutes, Table 1. Its toxicity is comparable to cyanide. It is the most destructive gas known! Fifty ppm will cause highly stressed, high strength steel to fail in only minutes and small concentrations can reduce drill pipe life by a factor of ten. Even 0.1 ppm will greatly reduce the time to failure of highly stressed, high strength drill pipe. In addition to being the only pipe. In addition to being the only gas which causes embrittlement, H2S also contributes to corrosion fatigue of any grade of drill pipe.

Heretofore there has never been a satisfactory method of scavenging H2S except in small quantities and involving less than desirable situations. The use of zinc and copper compounds results in time, temperature and pH sensitive reactions. Slow reactions, the need for high pH, plating tendencies and corrosive and unstable by-products are but a few of the problems wholly eliminated by the use problems wholly eliminated by the use of this new material. Most important, however, is the ability to protect people, pipe and the environment even people, pipe and the environment even with the well on choke due to a kick containing high concentrations of hydrogen sulfide.

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