CAN THE LIGHTWEIGHT DRILLING FLUID PREVENT FORMATION DAMAGE?

In drilling,the positive pressure difference can damage and protect the oil and gas zone.The key problem is rapidly to form the tight cake.Because of the low differential pressure on balanced drilling or near balanced drilling,it is harmful to form and strengthen high quality cake.So it is easy to damage oil and gas zone.If the shielding temporary close technology is used,a suitable high positive differential pressure is benefit to form the strong and good quality filter cake.At the same time,it makes the well control safe and well wall stable.So it is much suitable for formation damage prevention.