1. Features
■ Uniform acidizing: controlled acid distribution volume to achieve the uniform acidizing in the horizontal section..
■ Long acidizing interval: acid distribution interval can reach 1000m in horizontal section.

2. Technical principle
According to the different reservoir properties along the horizontal section, acid distribution pipes with different embedded mini-size flow control valve ( with different resistance coefficients) are designed to achieve the uniform acidizing along the horizontal section.

3. Improvements
■ Prevent intensified heterogeneity of permeability along the horizontal section due to non-uniform acidizing and also to control fast increase of water cut ..
■ Enhanced the acidizing result
■ Enlong the effecting time of the acid stimulation

4. Application results
The technology was effectively applied in over 20 wells in eastern oilfields in the second half of 2008. Currently, it has been widely promoted to major oilfields in China