%0 Dataset
%T Patent collection on Key Technologies of drilling technology and wellbore working fluid
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/751543b0-4373-4bdd-a993-b09beb38e15f
%W NCDC
%R 10.12072/ncdc.SRIPE.db1694.2022
%A Gao deli
%K Frozen soil layer;cementing slurry;rheology;slurry performance optimization
%X About the patent set of safety drilling technology in permafrost layer (10 pieces), according to the innovative achievements of the project research, the project team has applied for 10 invention patents. The main patent contents are described as follows: low temperature thickener of cement slurry can test the low temperature thickening performance of cement slurry at room temperature to prevent the data distortion or too fast solidification during the consistency test of low temperature cement slurry at room temperature; The high-speed agitator of negative temperature cementing slurry can prevent the rapid solidification of low-temperature cement slurry in the mixing process, and realize the preparation of low-temperature cement slurry at room temperature; Soil powder grinding and screening machine is a small soil sample grinding and screening machine used for sample preparation in geotechnical mechanics experiment. It has the characteristics of simple structure, convenient operation and easy cleaning; The low-temperature water loss instrument of cementing slurry can effectively solve the problems that the cement is not solidified and has no strength due to liquid phase segregation and freezing of conventional cement slurry in negative temperature environment, and the cementing quality is poor or even completely unable to carry out cementing operation in low-temperature permafrost area, so as to meet the needs of cementing operation in permafrost area; The heat and thaw prevention device for drilling in permafrost layer can meet the requirements of casing heat insulation for medium and deep well drilling in permafrost region; The cementing method in permafrost area can effectively prevent heat in permafrost area, ensure permafrost from freezing and thawing when drilling in permafrost area, and ensure cementing safety; The device and method for preparing frozen soil core can simulate different frozen soil depth by applying different pressing force to loose frozen so