«Oilfield engineering»

Study of the thixotropic properties of the flow-deflecting composition used when treating the bottomhole zone and acid hydraulic fracturing of a formation

UDC: 622.276.66 КГ
DOI: -

Authors:

¹ Almetyevsk State Technological University "Higher school of Oil", Almetyevsk, Russia

Keywords: thixotropy, bottomhole zone, viscosity, gel, shear stress, flow diverter system, polymer, shear rate, rheology, rheopexy

Annotation:

Thixotropy is the ability of a liquid to reduce viscosity of mechanical stress and increase viscosity in the state of rest. Some gels or liquids that are thick or viscous in static conditions will become thinner and less viscous over time when subjected to shaking, agitation, shear or other stresses. They then take some fixed time to return to a more viscous state. When treating the bottomhole zone, there used flow-diverting systems (FDS) – the cross-linked polymer compositions that have the properties of quickly gaining high viscosity in a short time at low temperatures. They are used for uniform acid treatment of all productive intervals of the formation. The composition allows for continuous, multi-stage acid treatment of horizontal wells bottomhole zone without waiting for polymerization.
The authors of the article present the results of studying the thixotropic properties of model flow diverter compositions. Based on the results obtained, graphs of the shear stress dependence on the shear rate were built as well as rheological curves of forward and reverse stroke were obtained, which do not coincide and form a hysteresis loop, thus indicating the presence of thixotropic properties of the dispersed system under study. The conducted rheological studies showed that the studied compositions exhibit the properties of pseudo-plastic liquids, i. e. the dependence of the shear stress on the strain rate is described by a power law. It has also been established that FDS is characterized by non-stationary rheological properties.

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