Static and Dynamic Adsorption of Phosphonate and Polymeric Scale Inhibitors Onto Reservoir Core From Laboratory Tests to Field Application

Abstract

Total 011 Marine; Kari Ramstad, Norsk Hydro as.; and Paul Griffin, Enterprise Oil q SPE Members -W9ht IWS. SocMY of Petmbum Engin@rs, Inc. This paper was pmpamd for presentation at the SPE Intwnathnal Sym~um on Oilfield CMW w in an A~Onb, TX, u. S.A -14-17 *~V 1* This paper was aekcted lor prawntattcm by an SPE Program committee Wowing review 01 information c+mtairmd in an 8Mmct submltbd by ttw authuts). COntenta of the P9PW, * -d. haw nor hen rfMewd by the SocretY of Petroleum Er@near'a M we subw to cmectmn bythOaurhOrts). ThOmatOM, as Prwem@, do-m~* wry poaitbn of the SaciMY of Petrotoum Engirwwa, w offiim, or members. P8PWS pmnnbd at SPE rnostings am wbjwt to publicdon reviw by Edhorial CommHton9 ot ttw Society d~m EW-. mxnmqbtiMd tomti-titi me~=-.ll~rMymtbOwPiBd. ThOabmmcttic=-n -=F@-=kõ r Mere and by wlwn the paper is rxwenbd. Write Ubrwian, SPE. P.O. Sox 8SSSSS, FMwOaOm TX 7SCWH4M, u.S.A. hbX, 1SS24S SPEUT. ABSTRACTIn this paper, results from static tests have been used to establish scale inhibitor adsorption mechanisms and levels in ... ...Lconsolidated reservoir cores and to ratm mmcmors for their adsorption behaviour and, in some cases, squeeze return lifetimes. The purpose of this rapid and simple type of bulk adsorption measurement is to assist in the selection of inhibitors for further coretlooding which should be carried out on a minimum number of inhibitors.A bulk adsorption sensitivity study can be canied out very rapidly compared with aref~]!v carried out reservoir condition core floods. The , ---------. . . value of such rapid screening tests is evident although we show that it is not always possible for all factors concerning squeeze lifetime to be determined in this way. It is still often necessary to carry out a much smaller number of reservoir condition core floods for a few (usually between 1 and 3) selected inhibitor products. This is necessary if the dynamic adsorption isotherm, I'(C), is to be derived in order to develop the "Field Squeeze Strategy" or for the assessment of formation damage which might occur in the squeeze treatment. A field example of this is presented briefly in this paper aithough cietaik can "Mfound eiseiviiere.

Mechanistic Investigation of Adsorption Behavior of Two Scale Inhibitors on Carbonate Formations for Application in Squeeze Treatments

“…The apparent adsorption results for PPCA on calcite and limestone for initial pH 0 4 and 6 at T = 95 °C are shown in Figure . The PPCA again shows qualitatively similar Γ app vs C f behavior to the DETPMP on these carbonate substrates, although there are detailed differences …”

“…The PPCA again shows qualitatively similar Γ app vs C f behavior to the DETPMP on these carbonate substrates, although there are detailed differences. 25 First, the results in Figure 11 show that the actual levels of Γ app are somewhat lower (Γ app ≈ 7−9 mg/g) for PPCA than for DETPMP (Γ app ≈ 25 mg/g). The amount of apparent adsorption (precipitation) decreased a little from Γ app ≈ 9 mg/g at pH 0 4 to Γ app ≈ 7 mg/g for pH 0 6.…”

“…Precipitation (denoted Π) refers to the mechanism where SI precipitates or “phase separates,” and this particulate or flocculated “precipitate” is physically retained in porous medium. ,, Precipitation squeeze treatments can give longer squeeze lifetimes than adsorption squeezes. − Although precipitation squeeze treatments appear promising for applying the SI, they may present some other issues. Precipitation squeeze treatment can form secondary deposits, known as “pseudo scales,” from interactions with divalent cations in the brine, which can block formation pores and consequently impair flow of reservoir fluids. − Moreover, it can induce formation damage, where the rock structure is affected by SI precipitation. − …”

Method for Determining the Amount of Crude Oil Desorbed from Silica and Aluminosilica Surfaces upon Exposure to Combined Low-Salinity Water and Surfactant Solutions

“…Core flooding experiments are the classical tests to study both the oil recovery/desorption and surfactant adsorption during chemical EOR methods. − However, running core displacement tests is usually time-consuming and expensive . Previously, the quartz crystal microbalance (QCM) technique has mainly been used to investigate the adsorption of polymers, surfactants, co-adsorption of surfactants and polymers, and viscoelastic properties of polymers .…”

“…8−13 However, running core displacement tests is usually time-consuming and expensive. 14 Previously, the quartz crystal microbalance (QCM) technique has mainly been used to investigate the adsorption of polymers, surfactants, co-adsorption of surfactants and polymers, and viscoelastic properties of polymers. 15 Recently, the QCM has also been used to study crude oil desorption during low-salinity brine injection.…”