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Non-Acidic Iron Sulfide Scale Dissolver: From Lab Development To Field Application

Picture for Non-Acidic Iron Sulfide Scale Dissolver: From Lab Development To Field Application
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Product Number: 51321-16764-SG
Author: Tao Chen; Qiwei Wang; Frank Chang; Fouad AlSultan
Publication Date: 2021
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$20.00
$20.00

One of the major challenges encountered in the sour wells is iron sulfide scale deposition. It causes issues of well deliverability, well intervention, and production loss. Mechanical descaling is currently applied, but it is time-consuming and costly. Dissolvers based on concentrated hydrochloric (HCl) acid have high dissolving power, but they also have limited applicability due to overwhelming drawbacks such as corrosion and H2S generation. A non-acidic chemical dissolver was developed to remove iron sulfide deposited at downhole
tubular and near wellbore region. The chemical is non-corrosive and no H2S generation during dissolution. The standalone chemical treatment for iron sulfide removing in the downhole tubing in a sour oil well was successfully executed. Jetting, repeated treatment and longer soaking time were applied to overcome the limitation of this scale dissolver. The results demonstrated the chemical process provided desirable scale removal with significantly reduced cost compared to the conventional mechanical descaling. The multifingered
caliper log runs pre-chemical and post-chemical treatment showed up to 90% of the scale can be removed by the chemical treatment. The dissolution efficiency is higher in the deeper section of the production tubing due to higher temperature at the bottom part of the tubular.

One of the major challenges encountered in the sour wells is iron sulfide scale deposition. It causes issues of well deliverability, well intervention, and production loss. Mechanical descaling is currently applied, but it is time-consuming and costly. Dissolvers based on concentrated hydrochloric (HCl) acid have high dissolving power, but they also have limited applicability due to overwhelming drawbacks such as corrosion and H2S generation. A non-acidic chemical dissolver was developed to remove iron sulfide deposited at downhole
tubular and near wellbore region. The chemical is non-corrosive and no H2S generation during dissolution. The standalone chemical treatment for iron sulfide removing in the downhole tubing in a sour oil well was successfully executed. Jetting, repeated treatment and longer soaking time were applied to overcome the limitation of this scale dissolver. The results demonstrated the chemical process provided desirable scale removal with significantly reduced cost compared to the conventional mechanical descaling. The multifingered
caliper log runs pre-chemical and post-chemical treatment showed up to 90% of the scale can be removed by the chemical treatment. The dissolution efficiency is higher in the deeper section of the production tubing due to higher temperature at the bottom part of the tubular.

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51316-7264-New Developments in Iron Sulfide Scale Dissolvers

Product Number: 51316-7264-SG
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This paper presents the latest laboratory results on iron sulfide dissolver evaluation. The recently developed dissolvers were studied for their dissolving powers using iron sulfide scale solids and the corrosion rate to mild steel at elevated temperature. Based on these results, the technical gaps and future developments for iron sulfide dissolvers are discussed.
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02240 MOLECULAR MODELING OF CORROSION OF IRON IN H2S ENVIRONMENTS

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Picture for 02030 (THPS) FOR DISSOLVING IRON SULFIDES...
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02030 TETRAKISHYDROXYMETHYLPHOSPHONIUM SULFATE (THPS) FOR DISSOLVING IRON SULFIDES DOWNHOLE AND TOPSIDE - A STUDY OF THE CHEMISTRY INFLUENCING DISSOLUTION

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Recently, it has become apparent that THPS, often used as a biocide in oilfield operations, also dissolves iron sulfide scales. The chemistry of this process is reviewed and a study of iron sulfide dissolution, over a range of conditions, is reported.
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