专利名称：DRILLING FLUID发明人：JACK H. DOUGLASS申请号：US3635822D申请日：19691107公开号：US3635822A公开日：19720118
摘要：A method of restoring the physical properties to a shale control drilling fluidcontaining a dihydroxynaphthalenesulfonic acid dispersant wherein the hydroxyl groupsare in adjacent positions to each other on the same ring and the sulfonic acid group is oneither ring that has been detrimentally effected by exposure to high-drilling
temperatures above about 250 DEG F., which comprises stirring said heated drilling fluidand adding thereto a minor amount of calcium hydroxide.
申请人：TEXACO INC.
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