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With the consumption of shallow resources on the earth, the exploration and development of resources are constantly marching to the depth, and the conditions of strata encountered are becoming more and more complicated. Hard and dense formations, strong abrasive formations, and other complicated strata conditions have been a major hindrance to deep drilling. The diamond bits are widely used in geological resource development. Therefore, the comprehensive performance requirements of diamond bits are also increased. However, the existing diamond bits can only be applied to a certain formation and need to be replaced frequently, therefore, the research and development of broad-spectrum diamond bits with excellent formation applicability, high drilling efficiency, and long bit life is an important part of overcoming the deep drilling tasks. In recent years, the diamond drill bit has been developed rapidly, the structure, category, and performance have been greatly improved, and there also exists a certain improvement space. Therefore, this paper introduces the research status and important achievements of broad-spectrum diamond drills in recent years, including the improvement and application of drill structure and matrix performance, and then puts forward the research problems and future development direction of diamond drills with respect to the existing research results of broad-spectrum diamond drills. By summarizing the development trend of broad-spectrum diamond bits in this paper, the new research direction of diamond bit making technology and application field was revealed, which is of reference significance to the research and development of broad-spectrum diamond bits in the field of oil and gas exploration and mineral resources development. [ABSTRACT FROM AUTHOR]

The article is based on the C40 high lift pumping manufactured sand concrete. The water-binder ratio,sand ratio and the content of fly ash on the workability and mechanical property of concrete was studied. The construction performance of concrete was also verified. The results show that the workability of manufactured sand concrete mixture is optimal when the water-binder ratio is 0.37,the sand ratio is 42% and the content of fly ash is 25%. The compounding strength of concrete is 52.8MPa and the electric flux is 964 C. The test results in site show that the slump and expansion of concrete mixture can meet the re-quirements of construction. The inverted slump cylinder emptying time of concrete mixture is less than 5 seconds before pumping and the time is between 5-10 seconds after pumping. In general, the manufactured sand concrete has good construction performance. [ABSTRACT FROM AUTHOR]