2、Green and high efficient water injection well - plugging remove technology --- no back row fine Acidizing        

（1）Technical Introduction

“Green high efficient injection solution plugging technology "is based on the different reservoir lithology and pore blockage types were analyzed, and the formation condition of indoor simulation test, targeted to develop a different solution scheme, can achieve different mineral effectively dissolve step by step, remove near wellbore low permeability reservoir pore jams, the secondary precipitation, and does not raise the near wellbore reservoir permeability, so as to realize the purpose of the step-down augmented injection

（2）Technical characteristics

"Targeted, suit the remedy to the case", using the principle of rock mineralogical, oilfield chemistry, develop effectively improve product of low permeability reservoir, green, to efficiently solve the congestion of injection Wells, realize the step-down augmented injection, so as to achieve the purpose of enhance oil recovery

（3）No flow back scheduled to acidification technology

Through the radial perforation as the acidification guide, the target is to expand the acidizing radius and area. Based on fine acidification technology at the same time, targeted the different pore filling wall type compound acid formula, phase points in order to effectively dissolve acid of different minerals, remove near wellbore low permeability reservoir pore jams, raise the near wellbore reservoir permeability, improve the capacity of low permeability oil layers, effectively extract oil reservoir's potential.

3、Clean Diverting Acidizing Technology

（1）mechanism

Add sensitive surfactant to acid：

Acid into high permeability zone first, with increasing reaction pH, surface active agent automatically blcok acid into high permeability channel, fresh acid continues to turn to deep penetration and low permeability layers, the heterogeneity of the reservoir and low permeability fractured reservoir full depth of the reform.

（2）Break Out

A. The oil well mainly depends on the hydrocarbon material to be added into the hydrophobic core, which expands the structure of the micelle and then disperses it into a spherical micelle to achieve the breaking.

B. In the water injection well, the concentration of micelle is reduced by the dilution of injection water to achieve the breaking.

C. The pretreatment solution or displacement liquid containing the mutual solvent can be applied to the adhesive of surfactant micelles in the oil well

（3）Clean Diverting Acid into gelled and break out