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• W4244553986 abstract "Scale Inhibitor Precipitation Squeeze For Non-Carbonate Reservoirs B.L. Carlberg B.L. Carlberg Conoco Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Production Technology Symposium, Lubbock, Texas, November 1987. Paper Number: SPE-17008-MS https://doi.org/10.2118/17008-MS Published: November 16 1987 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Carlberg, B.L. Scale Inhibitor Precipitation Squeeze For Non-Carbonate Reservoirs. Paper presented at the SPE Production Technology Symposium, Lubbock, Texas, November 1987. doi: https://doi.org/10.2118/17008-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 Production Technology Symposium Search Advanced Search AbstractThere has been evidence of a need for scale inhibitor precipitation squeeze treatment in sandstone as well as in carbonate reservoirs. The Mixed Chelate process was designed to meet that need with the injection of a single solution. Success in the laboratory has been verified with numerous experiments. Success has also been evidenced in a field test initiated in late 1986.IntroductionConoco has made widespread use of the scale inhibitor precipitation squeeze for more than eight years. The technique has been especially applicable to high-volume thick-zone producers, where other forms of scale inhibitor treatment have been unsuccessful or short-lived. Unfortunately, the precipitation squeeze, as it has been used to date, is limited to carbonate reservoirs. But this does not lessen the need for precipitation-type treatment in non-carbonate reservoirs. Scale inhibitors adsorb poorly on sandstones, and adsorption-type treatments are of unacceptably short life. A squeeze treatment life with the precipitation technique in a carbonate reservoir is commonly 18 to 24 months. By comparison, adsorption-type treatments last only about 3 months. To fill this need, Production Research Division of Conoco has worked to develop a precipitation squeeze for use in sandstone reservoirs.In this paper we introduce the Mixed Chelate process. a new precipitation squeeze procedure for use in non-carbonate reservoirs. Development and use of the process will be chronicled in future papers.The precipitation squeeze is based upon the precipitation of the calcium salt of an appropriate scale inhibitor within the interstices of the reservoir rock. In a limestone reservoir, the needed calcium is present in the rock but a sandstone contains little or no calcium. The calcium required for precipitation must be included with the squeeze solution, and therein lies the problem. Phosphonate or polyacrylate-type scale inhibitors are commonly used in precipitation squeezes. If we add excess calcium ion to a neutral solution of one of these inhibitors, a calcium salt of the inhibitor precipitates.One attempt to circumvent this problem has been to inject a neutral phosphonate solution, then overflush with a calcium chloride solution. Conoco has used this treatment in Wyoming. The technique relies upon mixing of the two solutions within the interstices of the reservoir rock. Success has been limited, apparently because of the inefficiency of such mixing. Other companies have spoken of similar, limited success.In the Mixed Chelate process, a single solution containing chelated calcium and scale inhibitor is squeezed into the well and displaced away from the wellbore. After a controlled delay, the calcium salt of the scale inhibitor begins to precipitate. The reaction is allowed to proceed. The normal 24-hour shut-in period following treatment will normally suffice for maximum precipitation.BackgroundThe chelating ability of a compound is described by the stability constant, K:..........................................(1)and..........................................(2)This stability constant is normally expressed as log 10 K. Keywords: calcium ion concentration, production chemistry, chelant, nta, asphaltene remediation, phosphonate, upstream oil & gas, wax inhibition, scale inhibition, scale inhibitor Subjects: Production Chemistry, Metallurgy and Biology, Unconventional and Complex Reservoirs, Inhibition and remediation of hydrates, scale, paraffin / wax and asphaltene, Carbonate reservoirs This content is only available via PDF. 1987. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4244553986 title "SCALE INHIBITOR PRECIPITATION SQUEEZE FOR NON-CARBONATE RESERVOIRS " @default.
• W4244553986 doi "https://doi.org/10.2523/17008-ms" @default.
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