Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 10 (October 2018) 1796-1802   

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  INVESTIGATION OF BARIUM SULFATE PRECIPITATION AND PREVENTION USING DIFFERENT SCALE INHIBITORS UNDER RESERVOIR CONDITIONS
 
A. Khormali, A. R. Sharifov and D. I. Torba
 
( Received: November 28, 2017 – Accepted in Revised Form: August 17, 2018 )
 
 

Abstract    In this work, scaling tendency and amount of precipitation of barium sulfate (BaSO4) were determined; the process is depending on temperature, pressure and mixing ratio of injection and formation of waters. Results showed that BaSO4 precipitation is largely dependent on mixing ratio. Temperature and pressure had no influence on BaSO4 precipitation. Different scale inhibitors, including a new inhibitor package, were used for preventing BaSO4 precipitation. The new scale inhibitor consists of three different acids such as phosphonate acid, hydrochloric acid solution, isopropyl alcohol, ammonium chloride and water. In addition, the lowest interfacial tensionon the boundary of oil and new inhibitor occurred at 10% of hydrochloric acid. Furthermore, effect of temperature, mixing ratio of waters and barium concentration on the inhibition efficiency of BaSO4 formation was studied. Results showed that the new inhibitor has the highest efficiency for preventing BaSO4 precipitation at any temperature, mixing ratio and barium concentration. Moreover, formation damage due to BaSO4 formation with and without scale inhibitors was determined by core flood tests. In the presence of new inhibitor, the damaged rock permeability ratio was improved from 0.59 to 0.924.

 

Keywords    Barium Sulfate, Formation Damage, Scale Inhibition, Scale Prediction

 

چکیده   

در این مقاله، وابستگی میزان اشباع و رسوب سولفات باریم به دما، فشار و نسبت ترکیب آب تزریقی به مخلوط تعیین شد.نتايج نشان داد که رسوب سولفات باریم عمدتا وابسته به نسبت ترکیب آب تزریقی به مخلوط است.تغییرات دما و فشار تاثیری بر تغییر میزان تشکیل سولفات باریم نداشتند. بازدارنده های مختلف، از جمله یک بازنده جدید، برای جلوگیری از رسوب سولفات باریم استفاده شدند. بازدارنده جدید شامل سه نوع فسفونیک اسید مختلف، هیدروکلریک اسید، الکل ایزوپروپیل، کلرید آمونیوم و آب است.کمترین کشش سطحی بین نفت و بازدارنده جدید در غلظت 10 درصد هیدروکلریک اسید مشاهده شد.اثر دما، نسبت ترکیب آب ها و غلظت یون باریم بر بازده بازدارنده ها مورد بررسی قرار گرفت.نتایج نشان داد که بازدارنده جدید دارای بالاترین کارایی برای جلوگیری از رسوب سولفات باریم در هر دما، نسبت ترکیب آب ها و غلظت باریم است.علاوه بر این، آسیب سازند ناشی از رسوب سولفات باریم در حضور بازدارنده ها و نیز بدون آن هااز طریق تست های سیلاب زنی مورد مطالعه قرار گرفت.در حضور بازدارنده جدید، نسبت نفوذپذیری سنگ از 0/59 به 0/924 بهبود یافت.

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