Strategy of multipay fields address management

Abstract

TX 75083-3836, U.S.A., fax +1-972-952-9435. AbstractMultipay fields are often considered to be developed with a single well pattern, which is justified by economical efficiency reasons. Using smart well technologies is now on the highest peak of popularity. Although, such technologies allow intelligent monitoring and control to be performed, the most effective well regimes consideration is a challenging problem by itself. Because of system restrictions (casing diameter, wellhead pressure, infrastructure capabilities), regulating flow from/to one of the branches of such well can reflect on the overall system performance. Considering this, wells regimes should be worked out to give maximum economic efficiency. After the plan is worked out, control could be performed by choking layers with undesirable water/gas production (i.e controlling BHP). Rosneft oil company operates Priobskoye field which has three productive layers (AC10, AC11, AC12) being developed. These layers are characterized with low permeability (1 to 20 mD) and different relative permeability characteristics which leads to non-uniform waterflooding and hence, difference in production watercut by layers. In order to perform monitoring and control procedures separately with each layer, it was considered to equip injection wells with special tools. A strategy of control for such wells is described in this paper. It is based on integrated study which includes NODAL analysis, watercut prediction and well tests. For injectivity curve (P,Q) characteristics (which is non-linear due to fractures development at high BHP), multi-rate tests are being performed. These tests allow obtaining non-linear injectivity characteristics to use it in NODAL analysis tool. Besides the method and case study, general recommendations are also given.