Wells – Processes – Cementing – plugging or consolidating
Patent
1977-05-16
1978-09-12
Cockeram, H.S.
Wells
Processes
Cementing, plugging or consolidating
260 18TN, 260 75NT, 528 67, 405264, E21B 33138, C08G 1876, E02B 312
Patent
active
041130146
ABSTRACT:
The present invention relates to a process for the reinforcement of geological formations and loose rock and earth masses by introducing, into the cavities of the geological formations or rock or earth masses which are required to be reinforced, reaction mixtures based on organic polyhydroxyl compounds and organic polyisocyanates which react to form polyurethanes, which process is characterized in that the polyisocyanate component used is a polyisocyanate mixture containing from about 10 to 80%, by weight, of 2,4'-diisocyanato-diphenylmethane. The present invention also relates to a two-chamber cartridge suitable for carrying out the process according to the present invention. This cartridge comprises two chambers separated from each other, one containing a polyisocyanate component and the second chamber containing a polyol component, the quantitative proportions of the two components being calculated so that when the cartridge is destroyed, a reaction mixture which reacts to yield a polyurethane is obtained, characterized in that the polyisocyanate component used is a polyisocyanate mixture containing from about 10 to 80%, by weight, of 2,4'-isocyanato -diphenylmethane.
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patent: 3397542 (1968-08-01), Moulden
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patent: 3692813 (1972-09-01), Hagewann et al.
patent: 3805531 (1974-04-01), Kistner
patent: 3882684 (1975-05-01), Meyer et al.
Gebauer Herbert
Kubens Rolf
Bayer Aktiengesellschaft
Cockeram H.S.
Colen Frederick H.
Harsh Gene
Pope Lawrence S.
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