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• W4244003835 abstract "Lessons Learned from Re-pickling Old/Sour Gas Wells Francisco Orlando Garzon; Francisco Orlando Garzon Saudi Aramco Search for other works by this author on: This Site Google Scholar Hisham A. Nasr-El-Din; Hisham A. Nasr-El-Din Saudi Aramco Search for other works by this author on: This Site Google Scholar Saleh Haif Al-Mutairi; Saleh Haif Al-Mutairi Texas A&M University Search for other works by this author on: This Site Google Scholar Abdullah Al-Harith Abdullah Al-Harith Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Middle East Oil and Gas Show and Conference, Manama, Bahrain, March 2007. Paper Number: SPE-105633-MS https://doi.org/10.2118/105633-MS Published: March 11 2007 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Garzon, Francisco Orlando, Nasr-El-Din, Hisham A., Al-Mutairi, Saleh Haif, and Abdullah Al-Harith. Lessons Learned from Re-pickling Old/Sour Gas Wells. Paper presented at the SPE Middle East Oil and Gas Show and Conference, Manama, Bahrain, March 2007. doi: https://doi.org/10.2118/105633-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Middle East Oil and Gas Show and Conference Search Advanced Search AbstractSaudi Arabia has embarked on developing its gas fields. Some of these fields produce sour gases with hydrogen sulfide content that can reach 10 mol% and carbon dioxide of 4–5 mol%. The carbonate formation is very tight and acid fracturing treatments were used to enhance the productivity of these wells. All tubulars were pickled before the acid fracturing treatments. Pickling was needed to remove mill scale (iron oxides) and pipe dope. Invasion of these contaminants into the formation would cause severe formation damage, which might adversely affect the productivity of these wells.Some of the gas wells have been on production for several years. There was a need to stimulate these wells to perform various workover operations. The question raised was whether there was a need to pickle the tubulars before performing acid treatments to these relatively old wells given the fact that these wells were pickled when the lower zone of the formation was fractured for the first time several years ago. Unlike new wells, the tubulars of old wells are typically covered with various corrosion products, condensate, and pipe dope.To address the question of pickling of old well tubulars, an acid formulation was designed to remove various contaminants that might present in the wellbore, while maintaining the integrity of the tubulars. The acid treatment was bullheaded in seven wells. Wellhead samples were collected every two minutes during the well flow back and analyzed for key elements.Similar to new tubulars, field data indicated that there is an absolute need to pickle old tubulars. High concentrations of total iron were detected in the well flow back samples. Manganese concentration was relatively low, indicating the acid pickling treatment did not affect the integrity of the low-carbon steel tubing. This paper describes in detail the laboratory work, treatment design, and field application. It will give conclusive evidence on the importance of pickling old tubulars and highlight the need for such treatments.IntroductionFormation damage occurs during acidizing or chemical treatments due to the presence of contaminants in the tubing and liner. Several researchers investigated the type and nature of these contaminants.1–8 The main contaminants present in a typical well tubing are mill scale, iron sulfides, pipe dope, sand, and other fine particles that were picked up during storage and transportation of the tubing string. Oil or condensate may also be present in old producers.One of the contaminants in the wellbore is pipe dope. Pipe dope is used to seal tubing joints, minimize thread erosion and enhance the galling resistance of the threads. Many authors recommended not using excessive amounts of pipe dope, which may end in the target zone and cause severe formation damage.4Another main source of wellbore contaminants is iron-based scale. New low-carbon steel pipes (J-55, C-95 and L-80) are always covered with mill scale (magnetite, Fe3O4).9–12 Iron oxides dissolve in HCl and release ferric and ferrous ions into the acid. Ferric ions will precipitate once the acid enters the formation and the pH rises above a value of 1–2.12–15 Precipitation of iron compounds will cause severe formation damage and, as a result, the efficiency of the acid treatment will diminish. In old wells and depending on the type of the treated well, iron-based scales can be covered by oil, condensate, or biomass. In addition, if the well is sour, then iron sulfide species will be present too.13 Some of the iron sulfide species react with HCl and produce hydrogen sulfide, which can react with iron and precipitate iron sulfide at pH values greater than 1.9.14,16 Hydrogen sulfide can also react with ferric ions and precipitate elemental sulfur.One of the main non-associated gas reservoirs in Saudi Arabia is the Khuff formation (carbonate). The Khuff formation is located in the eastern province of Saudi Arabia. This formation belongs to the late Permian age and is encountered at an average depth of 11,500 ft. The Khuff formation is subdivided into four main zones, denoted A, B, C, and D. Zones B and C are the two main intervals producing non-associated gas. Lithological studies show that the reservoir is composed of dolomite intermingled with limestone and intermittent anhydrite stringer within the tighter section of the reservoir. The two reservoirs have varying pay thickness, on average, from 120 ft in the Khuff B to 200 ft in the Khuff C. Keywords: Workplace Hazard, Corrosion Inhibition, flowline corrosion, oilfield chemistry, materials and corrosion, drilling fluid selection and formulation, drilling fluid chemistry, Pipeline Corrosion, Completion Installation and Operations, Subsurface Corrosion Subjects: Production Chemistry, Metallurgy and Biology, Pipelines, Flowlines and Risers, Health, Perforating, Acidizing, Materials and corrosion, Noise, chemicals, and other workplace hazards, Completion Installation and Operations, Well Integrity, Subsurface corrosion (tubing, casing, completion equipment, conductor) This content is only available via PDF. 2007. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4244003835 title "Lessons Learned From Repickling Old/Sour Gas Wells" @default.
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