Introduction

The agent has a large range of HLB value, can form micelle at the surface of the wellbore,  seal pore throats, especially those with considerably large size, and then can form tight sealing film with no permeability to effectively plug formations and shale with micro-fractures. Under the effect of the film, drilling fluid and filtrate are separated from formation to realize zero-filtration when drilling and the reservoir is protected from polluting. 

Main Features

1. can protect reservoir by plugging formations effectively;
2. the tight sealing film can form in a short time and can’t be removed once existing upward pressure;
3. with good capacity of enhancing leaking pressure and fracture pressure, which can solve the problems, such as lost circulation, sticking, sloughing and formation damage.
4. the pressure transmission can be prevented effectively by the film, so the differential pressure sticking of tool can be avoided.
5. th