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Qualification of Biopolymer in an Offshore Single-Well Test

Fig. 1—(a) High-shear mixing device; (b) high-pressure sampling point.

A single-well polymer-injection and back-production test has been performed in an oil and gas field offshore Norway. The objective of the test was to verify at field conditions the properties measured in the laboratory for the biopolymer schizophyllan. The data confirm that the biopolymer is not biodegraded during the shut-in period because of efficient application of biocide injected simultaneously with the biopolymer. Rate and pressure data also support that the injectivity is maintained during the test compared with water injectivity.

Introduction

Polymer injection has been considered as a method to increase oil recovery from the Heidrun Field. The field is located at Haltenbanken in the Norwegian Sea, producing from a large concrete floating tension-leg platform with access to 56 well slots in addition to tie-in of five subsea templates and two production and three injection templates. The recovery factor for the different formations ranges from 60% for the homogeneous high-permeability zones to 10% for the most-heterogeneous low-permeability zones.

Schizophyllan has a linear structure without charged functional groups, which results in virtually no loss of viscosity in high-salinity brine, especially in the presence of di- or multivalent ions, and comparably low adsorption on rock surfaces. Furthermore, schizophyllan shows short-term stability at temperatures up to 135°C and has shown half-life values of several years, exceeding 10 years at lower temperatures. Finally, schizophyllan provides high viscosity efficiency, with strong shear-thinning behavior but no shear-thickening behavior, at high shear rates.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 28019, “Qualification of Biopolymer in Offshore Single-Well Test,” by H. Urkedal, O.M. Selle, O.J. Seime, Ø. Brandal, SPE, and T. Grøstad, Statoil; A. Todosijevic, SPE, M. Dillen, SPE, D. Prasad, SPE, and B. Ernst, SPE, Wintershall Holding; and F. Lehr and E. Mahler, BASF, prepared for the 2017 Offshore Technology Conference Brasil, Rio de Janeiro, 24–26 October. The paper has not been peer reviewed. Copyright 2017 Offshore Technology Conference. Reproduced by permission.
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Qualification of Biopolymer in an Offshore Single-Well Test

01 June 2018

Volume: 70 | Issue: 6

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