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A.lsatayev. V. Bondarenko. RA TIONAL CHOICE OF LIQU/DS FOR KILLING OF WELLS

No.	Name of the coefficient	Meaning of the coefficient	Property of the liquid for killing
1	Type of collector	Terrigenous-poral	Hydrocarbon base, preserving the filtration properties of BHFZ
2	Permeability,10*^3* mkm	0,0001-1 0.01-379.65	Absence of colmataging materiał (hard suspended particles), high structural-rheological properties
3	Formation temperaturę, °C	80	High thermal stability during 5 days
4	Virgin formation pressure, mPa	23-35	Possibility to regulate the density of composition
5	Occurrence depth of top, M	2000-4500
6	Gas-containing, m^3/t	40-400	Low solubility of oil gas in the liquid of killing
7	Oil density, m^J/t	0,5-0,8	The viscosity of the liquid for killing must be high
8	Viscosity of oil in formation conditions, MPa*c	0,17-12,5
9	Type of formation water according to the classification	Calcium chloride	The formation of insoluble residues must not be observed
10	Total mineralization of formation water, g/1	13-40

Taking into account the data of Table 1 in our laboratory according to the technique [7] studies of liquid for killing were conducted, liquid for killing was prepared on the base of inverse W/O emulsion (IW/OE) of the following composition: formation water with composition and mineralization 19 g / 1 ; granulated calcium chloride (GOST 450-77 ); diesel fuel (GOST 305-82); reagent-emulsifier Yalan-E2, prepared according to ( ES 2458-001-22650721-2009).

We have studied such properties of IW/OE as electrical stability, thermal stability and rheological properties.

Table 2 presents experimental data on the

potential of the brcak-down of the well. The

results of the experiments showed that the potential of the break-down increases with the growth of the share of the water phase and decreases with the growth of its mineralization. With increasing content of the water phase from 80 to 85% a significant increase in the potential of the break-down is observed. Figurę 1 presents the dependence of the break-down potential of the hydrophobic- emulsion composition (HEC) containing 3% of emulsifier and 20% of calcium chloride of the content of the water phase. Table 2 presents the composition and electrical stability of the HEC.

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