Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1980-11-27
1983-05-31
Novosad, Stephen J.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
73151, 175 66, 175206, E21B 2106
Patent
active
043856667
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the technique of preparing drilling muds for drilling wells and more particularly to the methods controlling and maintaining the properties and parameters of a drilling mud.
The present invention may be most suitably used in the oil and gas industry for drilling wells.
DESCRIPTION OF THE PRIOR ART
At present the preset parameters and properties of a drilling mud are maintained by chemical treatment of the original water-base mud suspension (E. G. Kister. Chemical Treatment of Drilling Muds, published 1972, Nedra Publishers, Moscow, p. 5-27, in Russian).
Known in the art also are methods of maintaining the properties and parameters of a drilling mud by introducing chemical agents into the drilling mud while it circulates in the well (E. G. Kister, Chemical Treatment of Drilling Muds, published 1972, Nedra Publishers, Moscow, pp. 34-98, in Russian).
However, the known methods suffer from a number of disadvantages which eventually lead to a decrease in the quality of a drilling mud and increase in costs drilling. All the known chemical agents when used with one definite purpose have unwanted side effects on other properties of the drilling mud, thus requiring the use of additional chemical agents. Practically, the use of almost all chemical agents is limited by the conditions of drilling, for example, by high temperatures and polymineral attack.
Another characteristic of known methods is the impossibility to repeatedly use expensive chemical agents which results in substantial expenses.
SUMMARY OF THE INVENTION
The invention is essentially aimed at the provision of a method of maintaining the preset parameters of a drilling mud, which will enable the mud parameters preset by the drilling schedule to be maintained throughout the entire drilling process.
The exact nature of the present invention resides a method of maintaining the preset parameters of a drilling mud delivered into a well in the drilling process, according to the invention 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 values are compared, any variation in the value of the redox potential at the well outlet with respect to the value of the redox potential at the well inlet is registered, after which in case of any variation in the content of oxidation reaction 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, whereas 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 of the drilling mud is restored at the well outlet.
The method of the invention makes it possible to increase the quality of a drilling mud and at the same time to reduce the cost of expensive chemical agents. In addition, the timely control of the drilling mud parameters continued until the preset parameters are restored makes it possible to prevent troubles and emergency conditions associated with the loss or blow-out of the drilling mud.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail with reference to the accompanying drawings illustrating a specific embodiment thereof, in which:
FIG. 1 illustrates a graph of the redox potential versus the relationship of activity between oxidation and reduction forms of an agent.
FIG. 2 illustrates a diagram for practicing the method of maintaining preset parameters of a drilling mud.
BEST MODE OF CARRYING OUT THE INVENTION
For a better understanding of the method described herein, certain aspects which form the basis of the pre
REFERENCES:
patent: 2571247 (1951-10-01), Huebotter
patent: 3182735 (1965-05-01), Salimbeni et al.
patent: 3711765 (1973-01-01), Overton
patent: 3722606 (1973-03-01), Fertl et al.
patent: 3893522 (1975-07-01), Fertl et al.
Beits, R., "Opredelenie PH" by Khimiya Publishing House (Leningrad), 1968, pp. 366-372.
"Device for Rectification of Drilling Mud," WO80/02716, Dec. 1980.
Alekhin Stanislav A.
Bakhir Vitold M.
Mamadzhanov Ulmas D.
Novosad Stephen J.
Suchfield George A.
LandOfFree
Method of maintaining preset parameters of drilling mud does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of maintaining preset parameters of drilling mud, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of maintaining preset parameters of drilling mud will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2243000