8589356403

A.Isatayev, V. Bondarenko. RA TIONAL CHOICE OF UQUIDS FOR KILLING OF W FUS

Table 4 - Composition and thermal stability of the inverse W/O emulsions

No.	Water phase,% of Masses	Concentration of CaCl2 in water phase, % of masses	Thermal stability at 80°C, days
1	75	5	Morę than 20 days
2	75	5
3	80	5
4	80	10
5	80	15
6	80	20
7	80	40

During wells killing operations to minimize their intake by the producing formation in various geological - physical conditions of the deposit it is necessary to provide the regulation of killing liquid properties.

Figurę 2 presents the results of studies of the rheological properties of the HEC, depending on the content of the wat er phase and

shear    ratę    of    lOs'¹.

Analysis of the data shows that the effective viscosity of the emulsions, stabilized by emulsifier Yalan - E2 (3-5 % of masses), varies widely with the content of the water phase from 55 to 95%, at this a significant increase of the parameter is observed with increasing water content from 75 to 90% . Above 90% of the water phase the State of emulsion inversion is observed.

at 80°C at 20C2

Content of water phase

Fig. 2 - The dependence of effective viscosity of the HEC on the content of

water phase at shear ratę of 1 Os ¹

The effective viscosity of the HEC at the temperaturę 80°C is commensurable with viscosity at the temperaturę 20 °C and at the content of the water phase above 80% at Iow shear rates close to the filtration ratę of the content of bottom -hole formation zonę. (Figurę 2).

The next senes of experiments were performed at the shear ratę above 85 s'¹, corresponding to the flow ratę of the HEC in tubings during injection (Figurę 3).

At the temperaturę 40° C and below the convergence of values of the effective viscosity with the decrease of shear ratę to 90 s'¹ (Figurę 4) is observed.

Along with this for a morę detailed study of the influence of shear ratę on the effective viscosity, we carried out a series of experiments for three HEC with content of water phase of 50, 80 and 90%. It was established that in HEC with water phase content lower than 50% the effective viscosity at the temperaturę 80° C is lower than at the temperaturę 20°C.

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Journal of Industrial Technology and Engineering, 2012, 2(3): 19 24