| 摘要 |
<p>The invention concerns a method for using biodegradable fluid characterised in that it consists, at the very start of drilling, in introducing into the well a biodegradable surface sludge stable up to about 100 °C, with filtrate reducing power adjustable from 2 to 13 cm3 depending on the amount of filtrate reducing agent used, and with electric stability not less than 1000 volts, and when the temperature of the terrain being traversed reaches 100 °C, in replacing said surface sludge by a bottom sludge stable at a temperature higher than 200 °C, the surface sludge volume representing 60 to 80 % by volume of the total sludge used.</p> |
