Using sand bed filtration test proposed in ultra-low filtration drilling fluid technique, a reservoir protecting agent RP-5 was studied and evaluated on its sealing effect.

Pore-fractured tight reservoir protection in Qingxi oil field;

Study and application of reservoir protection technique for Tuo 74 fault block in Shengtuo oilfield.;

Reservoir sensibility experiment and reservoir protection technique of Yuedong structure.;

The well completion techniques including casing program, well completion method, formation damage control, putting well into production measure with acid fracturing of buried hill reservoir of Hekou oil field were introduced.

The BYJ series of non fluorescent multifunctional drilling/completion fluid additives for formation damage control, BYJ 1- 5 , chemically being modified polyols of different cloud point, have formation damage controlling, anti caving, lubricating, anti foaming, and non thickening properties and are easily degradable at environmental conditions.

For removal and change of casing in oil layer section, the cementing quality can not be ensured,the oil layer protection technique is not perfect,the mill efficiency is low,and the air bleeder treatment technique is not qualified.

A new tubing anchor, which has the function of oil layer protection, is developed according to the requirement of oil field production.

Formation protection techniques are studied in the sensitive viscous oil reservoirs of Wangzhuan Oilfield, the techniques for formation protection during drilling, operation and during steam injection are introduced.

Development course, present situation and trend of formation protection technique at home and abroad are introduced systematically.

Design and application of drilling and completion fluid system for formation protection in the key blocks of Dagang Oilfield;