This product is mainly for removing block in loose sandstone formation. It can react with carbonate component in the formation to form a dense and hard film, which prevents further reaction of the acid solution with formation. At the same time it fuses kaolinite in formation to generate larger particles that are difficult to move, achieving the goal of protecting the formation skeleton and prevent clay migration. Additives can be added in block remover that can stabilize the sand particle. The organic combination of the two can interact to fix the sand. Addition of other additives in block remover, the precipitation and the expansion of montmorillonite can be prevented, reducing the formation damage to the minimum.
1.Typical physical properties /Technical data
(1)Appearance: brown liquid;
(2)Density: 1.06~1.10g/cm3;
(3)Surface tension: 30~35 x 10-6mN/m;
(4)Corrosion rate: less than 10g/m2·h at 90℃;
(5)Prevent expansion ability: ≥70%(VH);
(6)Anti-scouring ability: ≥90%(0.8cm/s);
(7)Reaction with calcium: slow 10-20times and no obvious precipitate.
(8)Reaction with clay: slower 2-3 times than typical mud acid and the same of final dissolution rate.
2 Uses
It can be used for operation after diluting the concentrate at the ratio of 1:3 ~ 1:4 with water. Shut-in well and react 2 ~ 3 hours.
3 Dosage
Use 2.5 m3 for every meter of reservoir section (perforation penetration).