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51315-5701-Ultradeepwater H2S Scavenger for Oil and Gas Production

Picture for Ultradeepwater H?S Scavenger for Oil and Gas Production
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Product Number: 51315-5701-SG
ISBN: 5701 2015 CP
Author: Aline Kina
Publication Date: 2015
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$20.00
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The Brazilian offshore ultradeepwater comprises reservoirs below a layer of variable thickness of salt which can reach up to 2000 m. The presence of H2S in these fields adds complication to the process definition of the corrosive environment (Henriques et al. 2012).Hydrogen Sulfide is corrosive to downhole and topside oil and gas production facilities. Its presence in natural gas is also limited to very low levels due to sales specifications. One alternative to control the levels of H2S and mitigate its effects in oil and gas production facilities is the injection of liquid H2S scavengers at suitable points in the system. Liquid scavengers react with H2S to form stable water or oil soluble reaction products (Mendez et al. 2012).In Brazil there are two main ways to inject the H2S scavenger downhole. The first one in via umbilical and mandril and the second one is via gas-lift. Both of them require specific compatibility tests to inject chemicals.This paper is focused in the development of a H2S scavenger for ultradeepwater that could be injected though either umbilical or gas-lift.For gas-lift scenarium the low corrosivity of the chemical product is very important to address. Once it will be in contact with metallic materials and high salinity solutions during its injection.The performance of the chemicals was accessed in a simulated multiphase field conditions based on the procedures studied by Mendez et al. 2009. Meanwhile the compatibility tests were done.In this present work it was tested two types of chemicals as H2S scavenger. The first was a Triazine based scavenger and the second one was a Glycol derivative scavenger. Tests showed that the Glycol derivative scavenger presented better performance than the a Triazine based scavenger. Moreover due to the high salinity environment the triazine based H2S scavenger has scale issues. It intensify the inorganic scale because of its alkaline character. This behavior was found in the produced water and completion fluid compatibility tests.
The Brazilian offshore ultradeepwater comprises reservoirs below a layer of variable thickness of salt which can reach up to 2000 m. The presence of H2S in these fields adds complication to the process definition of the corrosive environment (Henriques et al. 2012).Hydrogen Sulfide is corrosive to downhole and topside oil and gas production facilities. Its presence in natural gas is also limited to very low levels due to sales specifications. One alternative to control the levels of H2S and mitigate its effects in oil and gas production facilities is the injection of liquid H2S scavengers at suitable points in the system. Liquid scavengers react with H2S to form stable water or oil soluble reaction products (Mendez et al. 2012).In Brazil there are two main ways to inject the H2S scavenger downhole. The first one in via umbilical and mandril and the second one is via gas-lift. Both of them require specific compatibility tests to inject chemicals.This paper is focused in the development of a H2S scavenger for ultradeepwater that could be injected though either umbilical or gas-lift.For gas-lift scenarium the low corrosivity of the chemical product is very important to address. Once it will be in contact with metallic materials and high salinity solutions during its injection.The performance of the chemicals was accessed in a simulated multiphase field conditions based on the procedures studied by Mendez et al. 2009. Meanwhile the compatibility tests were done.In this present work it was tested two types of chemicals as H2S scavenger. The first was a Triazine based scavenger and the second one was a Glycol derivative scavenger. Tests showed that the Glycol derivative scavenger presented better performance than the a Triazine based scavenger. Moreover due to the high salinity environment the triazine based H2S scavenger has scale issues. It intensify the inorganic scale because of its alkaline character. This behavior was found in the produced water and completion fluid compatibility tests.
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51315-5578-H2S Control Via Downhole Injection of a New Non-scaling H?S Scavenger Chemistry

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51317--9530-Development of High Temperature Non-Triazine based Hydrogen Sulfide Scavenger

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Laboratory performance evaluations and field data of the non-triazine based high temperature stable H2S scavenger will be discussed. The new H2S scavenger acts as a corrosion inhibitor and is thermally stable up to 200°C. It does not promote scale as observed during dynamic scale loop evaluations.

 
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