The titled ultra-concentrated AA/AM/AMPS tercopolymer inverse emulsion(IE) with white oil as dispersing medium can be used directly in water base drilling fluids as filtrate loss reducer.

The syntheses and properties of 4 environmentally safe solid additives for water base drilling fluids are introduced briefly and these are: modified natural macromolecular coating (inhibiting) agent IND30 and filtrate loss reducer NAT20; non-fluorescent "white asphalt" NFA25 (modified oily substances soluble partially in water and in oil); and powdered polyol PGCS1 (EO/PO copolymer).

A KDF water base mud that could be used at high pressure high temperature conditions was designed for use in this well having elevated temperatures and high pressures.

The copolymer and 20 percent of t concentrated sulphuric acid react at 50℃ for 2 hrs to produce a sulfonated styrene/itaconic acid copolymer-viscosity reducer for water base drilling fluids SSHIA.

An environmentally safe water-base drilling fluid ULTRADRILL;

Research on density of water-base drilling fluid at HTHP;

Although gas drilling increases ROP sharply in the process of drilling in Sichuan and Chongqing area and has been widely applied in the field of drilling,there appears widely serious destabilizing effect of borehole wall when bullheading conventional water-base drilling fluid after gas drilling,which results in frequent backreaming happened in long time and length.

Review of studv on semi-permeable membrane of water-based drilling fluid abroad;

Study on membrane generating technology of water-based drilling fluid;

Few literatures on water-based drilling fluid system that is anti-high temperature of 200 centigrade and density up to 2.

The current drilling fluid can hardly meet the need of deep well drilling, so the water based drilling fluid system which is applicable to deep exploration well in Bashituo is studiedThis paper analyzes geology engineering character of local region through looking up to a great deal of domestic and abroad relevant technology and related data of Bashituo field.