High-Pressure Squeeze Cementing
Definition - What does High-Pressure Squeeze Cementing mean?
High-Pressure Squeeze Cementing, also referred to as remedial cementing is a technique of repairing void spaces, fractures, or micro cracks that occur over time in a well because of continuous production. In this technique, the cement slurry is forced into annuli or microcracks surrounding a borehole with the help of high pressure pumps. The characteristics of a fracture depend on the fluid flow rate when the fracture is initiated. Therefore, high pressure squeeze should be carried out with great care so as to place slurry in the desired location. This technique of cementing is used where hydraulic pressure is utilized to make new channels in rock formations and also force slurry into these channels.
Petropedia explains High-Pressure Squeeze Cementing
In high pressure squeeze cementing, a formation is fractured initially by solid free fluids. The solid free fluids like brine or water are recommended as they can build a filter cake and block injection into the formation. The fractures' direction depends on the rock's stress of the formation. After the formation breaks down, cement slurry can be spotted adjacent to a formation and then pumped into the annuli or microcracks at a slow rate. When the cement slurry fills up the fractured area, injection pressure must build up gradually.
High pressure squeeze cementing is primarily used for the following purposes:
- Repairing leaks in the casing.
- If primary cement was applied in deficient or it broke out, then it is used to repair that void space.
- It helps in shutting down the breakthrough zone thereby changing the water to oil ratio or gas to oil ratio.
- When modification in the injection profile is needed.
- Abandoning the well.