Phosphonates are commonly used in the petroleum industry to control scale and corrosion. In order to understand the fate of phosphonates in the reservoir after an inhibitor squeeze, both the kinetics and the equilibrium aspects of phosphonate sorption have been studied in the laboratory using batch apparatus and sandstone core flow-through apparatus. Diemylenetriaminepenta(methylene phosphonic acid) (DTPMP) was used in the experiments. The adsorption process includes the following four stages: (1) molecular diffusion; (2) dissolution of mineral from sandstone surfaces; (3) adsorption; and (4) solid phase maturation. The adsorption is kinetically important and the amount adsorbed is affected by both flow velocity and calcium concentration. A new radial-flow transport equation to simulate the transport of phosphonate in an inhibitor squeeze is also reported.

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