Summary
When a conventional aqueous squeeze treatment is not suitable for preventing
scale formation, a nonaqueous treatment may be applied. Generally, these types
of treatments include a nonaqueous phase and can be divided into different
types on the basis of the delivery system. Despite the name, most nonaqueous
treatments still contain some water because of the scale-inhibitor (SI)
hydrophilic nature; it only truly dissolves in water.
The main purposes of this paper are (1) to model a series of polymer
nonaqueous SI squeeze treatments deployed in the Heidrun field in the Norwegian
sector of the North Sea, (2) to investigate alternatives to optimize the
squeeze design by studying the effect of the overflush, and (3) to show the
workflow to build the input-data model from the available field data. All the
field-treatment designs under study included the injection of an
amphiphilic-solvent phase as the SI carrier phase and injection of a diesel
overflush.
The simulation and optimization calculations were conducted using a
specialized near-wellbore model for scale treatments. The simulation study
matched the well water cut for the time of the treatment, followed deriving a
pseudoadsorption isotherm that was used to describe the SI retention in the
formation. Heidrun coreflooding data and SI-returns data were used to build the
input model. Finally, a sensitivity study on the effect of the overflush on the
squeeze lifetime was carried out on the basis of the created input models.
© 2011. Society of Petroleum Engineers
View full textPDF
(
1,181 KB
)
History
- Original manuscript received:
10 May 2010
- Meeting paper published:
26 May 2010
- Revised manuscript received:
7 July 2010
- Manuscript approved:
16 August 2010
- Published online:
13 January 2011
- Version of record:
22 February 2011
View Cart
