METHOD FOR MAINTAINING PRESENT PARAMETERS OF DRILLING MUD DELIVERED INTO A PRODUCTIVE BED IN THE FORMATION OF PETROLEUM,NATURAL GAS AND LIKE WELLS

PCT No. PCT/SU79/00088 Sec. 371 Date Nov. 27, 1980 Sec. 102(e) Date Nov. 3, 1980 PCT Filed Sep. 28, 1979 PCT Pub. No. WO80/02038 PCT Pub. Date Oct. 2, 1980.A method of maintaining preset parameters of a drilling mud delivered into a well in the process of drilling in which a value of the oxidation-reduction potential (redox potential) of the drilling mud is continuously measured at the inlet and outlet of the well. The obtained results are compared and a variation in the value of the redox potential of the drilling mud at the well outlet with respect to the value of the redox potential at the well inlet is registered. In case of any variation in the content of oxidation products in the drilling mud at the well outlet, the drilling mud is subjected to a unipolar electric treatment at the well inlet and the content of reduction reaction products in the drilling mud is increased until the preset value of the redox potential of the drilling mud is restored at the well outlet. In case of any variation in the content of reduction products in the drilling mud at the well outlet, the drilling mud is subjected to the unipolar electric treatment at the well inlet and the content of oxidation reaction products in the drilling mud is increased until the preset value of the redox potential is restored at the well outlet.