Abstract:Introduction is made on the development, technical parameters, main features, version verification test, production trial and appraisal of CD - 3 core drill.

Abstract:Description is made on the continuous drillpipe feeding theory and two important conditions of realizing the continuous drillpipe feeding, e. g. the holding force of the chuck and the operating pressure and stroke of the chuck cylinders, as well as the application of the swivel head.

Abstract:The problems present with Jones splitter are examined, the improving measures and the application of the improved GF splitter are described.

Abstract:During the ancient landslide treatment over Baoziliang Tunnel Mai grouting system including grouting anchor and grouting pump, related construction process and deep hole injection technique were used and good results were achieved.

Abstract:Description is made of the roller-type cutting head, the distribution law of the cutters, as well as the effect of drilling parameters on the drilling efficiency. The main problems present with the cutting head in the field use is analyzed with the field cuses.

Abstract:Multi-branch bearing disc piles are proven to be a new type of foundation in theory and practice.

Abstract:The equipment, drilling tools, drilling process and technical features of the dry auger boring method are described with reference to the field cases. When used to install large diameter bored piles in bouldery formation, the method exhibits fully such technical advantage as high hole completion efficiency, good quality, little environmental pollution and is an advance of the domestic pile foundation drilling technology.

Abstract:A brief introduction is made on the combined cone type cutting head with the rock fragmentation analysed, and comparison is conducted with the drag bit and the roller type cutting head in characteristics. Key elements in design and use are described.

Abstract:Wedge tungsten carbide inserts, sliding and sealed bearing, compensation system of lubricant and a new patented nozzole have been considered into the design of DKY95XHP5 geological cone bits. It will result in higher efficiency per rig. month and lower cost per footage using the drill bit and full face drilling technology in medium hard sandstone and limestone.

Abstract:A testing method of drill core's mechanical properties, triaxial stress testing, is described.Based on testing of partial cores taken in two areas, some rock mechanical parameters such as Poison's ratio,Young's modulus, tensile strength are determined. Analysis of the data indicates both that Poison's ratio and Young's modulus increase with the confined pressure. The empirical relationship formula is presented.

Abstract:It does no harm to the diamonds to produce full face oil well drilling PDC bits using the low temperature electroplating process. The grouping design is carried out on the nozzles. Trial in two wells has resulted in good economic and social benefits. Analysis is give to the characteristics of the bit and the problerns.

Abstract:Foam stablization mechanism of solid particles lies in the adsorbtion of solid particles at the gas/water interface. The solid film formed provides high density, high mechanical strength and high apparent viscosity. The moisting property and size of the solid particle are of great influence on the strength of the solid film.

Abstract:The technical problems encountered in demolition of the over-pass bridge at Zhonghua Avenue in the city of Qiqihar by blasting, and the solutions to them are detailed.