In the many factors causing formation damage, that from water block is one of the major factors. In the process of completion and production, water based well killing fluid, washing fluid, and other fluids will cause water blocking damage once they enter the formation, especially to those wells with low formation pressure (formation pressure gradient < 1) and low water content.  In oilfield production site it is very common to lose partially or all production rate due to the leaking of well killing fluid and well cleaning fluid into formation.  The anti-water blocking agent is a new type of oilfield chemical that effectively reduce the water block damage by preventing the entry of working fluid into formation.

1. Typical physical properties /Technical data

(1)Appearance: Colorless or light yellow liquid;

(2)Density: 0.95~1.05g/cm³;

(3)Temperature: ≤140℃;  

(4)Surface Tension:≤28mN/m;

(5)Interfacial Tension:≤0.6mN/m.

2.The Principle of choosing oil well

The anti-water blocking agent is mainly used at wells with low formation pressure which causes working fluid loss, wells with fluid being difficult to flow back, and the wells that have lowered production rate because of working fluid damage.

3. Uses

Add this product into well killing fluid, well cleaning fluid, or sand carrier fluid at 6% during operation.

4. Notes

(1)In the working fluid containing this product, no other chemicals should be added, such as cleaning agent, clay stabilizing agent, as well as the cleanup agent since they will cause the anti-water blocking agent lose its effectiveness.

(2)This product itself is good at cleaning and helps the water flow back process. A separate cleaner and flowback agent is not necessary.