The oil/water well block remover (V) is used to remove the plugging from inorganic sediment such as sulfide, corrosion products, and carbonate. It can remove the contamination to oil layer from mud or emulsion. It also effectively prevents the formation of secondary precipitation from calcium fluoride and ferric hydroxide. The product has good performance for corrosion inhibition and can be used for deep acid dissolution to removal plugging.
1. Typical physical properties /Technical data
(1)Appearance: brown liquid;
(2)Density:1.18~1.21g/cm3;
(3)Surface tension:<35mN/m, interfacial tension:<1.0mN/m;
(4)Inhibition performance: corrosion rate 2.5g/m2·h(90℃、atmospheric pressures、 N80 casing steel).
(5)Compatibility with crude oil: No formation of emulsion and acid sludge.
(6)Prevent secondary precipitation: Compared to acidizing with mud acid, precipitate from CaF2 decreases 99% and there is no Fe(OH)3 precipitation.
(7)Effective dissolution rate: same with that mud acid which composed of 12%Ha and 3%HF.
(8)Dispersivity: Soluble in water at any rate;
2. Applications
(1)Block removal near the oil well.
(2)Block removal at deep area of oil well by acidizing.
(3)Good for formation of 150℃ or less
3. Uses
(1)Preparation: dilute the product in clear water according to the ratio of 1:6
(2)Operation: injection it by cement truck into formation. Shut in and react 6-8 hours. For water injection well water can be injected after shutting-in 6-8 hours.
4. Dosage
For one meter of oil layer use 2-3 m3 (perforation penetration).