Aimed at this characteristics,some measures are taken,for example,drilling fluid system is selected,rational drilling fluid density is determined,plugging is enforced,filter loss with lower than 4mL in easily sloughing formation is ensured,mudcake quality is improved,drilling fluid viscosity is controlled to be the range of 45~55s and drilling fluid has suitable r.

Based on the inductive analysis of a large quantity of data collected in checking ammonium hydrolyzed polyacrylonitrile for drilling fluid in recent years, it is found out that the decreasing rate of filter loss of the saltwater base mud added to the test sample can not reach the standards of Q/CNPC 89-2003 ammonium hydrolyzed polyacrylonitrile for drilling fluid.

In the petroleum well drilling process, the control of drilling fluid\'s filter loss has the vital significance to protect the mud shale, wall as well as the production protection.

With the thickness of the mud cakes being determined, the relation between filtration rate and time can be established and this, combined with the relative perm.

By setting the filtration rate as target,the optimum synthesis conditions which composite high viscosity modified amylum is established with the approach of orthogonal experiment.

Quantitative evaluation of factors influencing filtrate loss of high density mud;

This text certain and measure the properties that konjac powder as food additive to keep water,include fresh water solution viscosity and filtrate loss;the salt solution viscosity and filtrate loss;water gel prepared and keep water properties parameter.

A cationized and sulfomethylated amphoteric phenol-formaldehyde resin was prepared by catalytic reaction of a cationized and a sulfomethylated phenol-formaldehyde resin and notated as filtrate loss reducer( FLR) XNSMP-Ⅲ.

Then it is discussed that the relative proportion of added amount of calcium bentonite and sodium carnonate amount has an effect on the result of filtration determination,finally normalizing the formulating methods of compound salt-water base slurry.

But the fluid loss of rectorite clay is extra low and the swell index is high.

Results showed that the application requirements of the oil company at home and abroad were different for the PAC apparent viscosity and fluid loss.

A new-type drilling fluid taking MAN-104, KN-PAN, WFT-666 and KCl as the major additives is characterized by good rheological properties, low filtration loss and non-permeable mud cake.