19th International Oilfield Chemistry Symposium, Geilo, Norway, 9 – 12th March, 2008

摘要

The effective placement of chemical squeeze treatments in heterogeneous wells and long reach horizontalwells has proved a significant challenge, with various factors including heterogeneity, crossflow andpressure gradients between otherwise non-communicating zones within the well, all contributing to anuneven placement of the scale squeeze treatment into the reservoir. Current methods to circumvent theseproblems often rely on extremely expensive coiled tubing operations, staged diversion (temporary shut off)treatments or by designing treatments to deliberately overdose some zones in order to gain placement inother (e.g. low permeability) zones. As part of a multi-sponsor Joint Industrial Project, a series of papershas been released in recent years describing the development of a near wellbore placement modeldeveloped to model properly the flow behaviour of both Newtonian and non-Newtonian injection fluids inthe near wellbore region. In this paper, we describe the extension of previously reported dual linear coreflood placement tests technology to the radial case, in which the flow behaviour of the injected fluids moreclosely resembles that in the near wellbore region. By extending the test technology in this way, we areable to examine aspects of shear thinning fluid behaviour which are only manifested in radial flowenvironments. We will present laboratory test results comparing the placement of aqueous and lightlyviscosified fluids in such systems with that predicted by the model, and discuss the implications of theseresults for field treatments.