Cake removal technology

Removal method

Characteristics

Scope of application

Natural removal

Pressure drop

Easy to apply and the cake removal efficiency is low

Mainly in the open hole completion section

Mechanically removal

Jets: erosion, cutting dissolve

Removal effect is better in near wellbore area

Mainly in open hole completion section

Chemical removal

Dissolves soluble substances and degrade polymer

Removal effect is better but it will cause damage to the reservoir and the pipe string

Cake containing acid soluble substance and polymer

Biological removal

Degrade polymer

Removal effect is better and have little damage to reservoir

Cake containing polymer