Abstract:This paper describes the FD-300 hydraulic top-drive drill In its design concept,components,performance,main parameters,main features,as well as verification of the drill version and the field test.

Abstract:Studies on the percussive energy transfer of large diameter DTH hammers show that the percussive energy transfer is affected by weight proportion, diameter proportion of percussive piston and bit. It can direct design of large diameter DTH hammer and bit,improve application effect of DTH hammer.

Abstract:The natural gas resources in shallow formation are very rich in China. The cost of exploiting gas resources may be reduced markedly by use of geologic drilling rig. It is necessary to research technology and tool equipment for exploiting natural gas resources in shallow formation by geologic drilling rig. The lightweight BOP in this paper is designed for geologic drilling rig. It adopts adjustable top seal,severable ram block and the transmission structure of chain wheels and bearings,therefore it has reasonable design,novel structure, reliable seal and convenient control,and it is also safe to drill.

Abstract:This paper deals with the heat treatment process and mechanical properties of 45Mn2 steel drill pipe joints. The optimal technological processes of heat treatment determined by the fracture mechanics have been put into production and have obtained very good economic benefit.

Abstract:The operation principle and method of trenchless pipeline installation using guided boring are described with field cases. A set of guided borehole path design and direction control method is summarized. Some proposals are presented on development of the trenchless pipeline installation technique using guided boring in China.

Abstract:On the basis of the qualitative analysis of the factors affecting stability of the judged field cases,four main classes of factors comprising 14 items are selected as the stability evaluation index and quantified to make the fuzzy comprehensive evaluation by four grades:stability,fairly stability,fairly instability,instability using the two-level fuzzy comprehensive evaluation method. The results are very identical with the practical conditions of the slope.

Abstract:The calculation model for the deep foundation pit side wall retaining is put forward. It's pointed out that the Raukine and Coulomb soil pressure theories have their limitations when used in the deep foundation pit side wall retaining design. The calculation model for the deep foundation pit of rock wall design and considerations are described.

Abstract:Based on the first trial use of a new method for grouting at the bored pile end and sides, analysis and comparison of the trial pile information, the mechanism of increasing the single pile vertical bearing capacity by the new method is investigated. It is stressed that pressure grouting at the pile end,especially the pile sides,increases the single pile vertical bearing capacity greily. The construction method of the new method is detailed.

Abstract:In the case of insufficient friction resistance in sandy formation,the single pile bearing capacity is successfully increased by forming a concaveconvex type bored pile. The design,construction andresults of the concave-convex bored pile are described.

Abstract:This paper describes the single tooth test for studying the rock breaking process of roller-cone bits in mud rock under simulated downhole pressure conditions (from 0 to 5000m). The tests are carried out under the laboratory condition using deep-well rock breaking tester. The results indicate that the penetration rate slows down with depth is attributed to increasing rock hardness,increasing cutter forces,increasing specific energy and decreasing volume of broken rock with well depth increasing. Therefore,it is necessary to determine the cutter shape and the cutteroplacement pattern in order to fit deep formation drilling and increase the rate of penetration.

Abstract:The components and main functions of the Teres Tek system are introduced with reference to petroleum engineering and drilling area where the rock mechanics parameters are applied.

Abstract:Considering the status of the drilling technology used in geo-core drilling. Some measures are made by some department of exploration on further increasing the geo-core drilling level by popularization of the three main advanced techniques.

Abstract:During drilling through the SK500m exploratory formation in iran,the PHP-CMC gel low-solid mud is used to drill the overburden against loss circulation,clean water and the double-tube swivel type diamond drilling tool used to drill the test interval and kill the water flow,and then the PHP-CMC gel non-solid fluid used for hole-wall protection to the final depth with the pump pressure grouting method to stabilize the hole walls. This results in better solutions to deviation,blockage,loss circulation and water ingression.

Abstract:Design and parameters of the water pressure and shothole blasting are given in this paper through analysing characteristics of this blasting method. The practice illustrates that good results such as fast resolving and crushing of building,safe collapse in direction can be achieved by this technique in demolition of the cylindric strong structure.

Abstract:Analysis is made of the presence of diamond in the matrix of the diamond products domestically manufactured,the welding mechanism of diamond and method of improving the diamond surface properties. The process of creating a metallic carbonide interface on the surface of the diamond by applying metallic additives is researched. Through production trials,diamond is successfully welded to the matrix metal nuder the common production conditions,improving the product performance,productivity and service life,and reducing the production cost.

Abstract:Fracturing fluids and propping agents are the essential materials for CBM well fracturing to increase yield. Through experiments,analysis is made of the low temperature gel-breaking effect of the gelbreaking agent,the damage of the fracturing fluid to the coal host permeability is modelled,and a complete set of fracturing fluid system and formulation suitable to CBM wells is formed. It is decided that the quartze sand be used as the propping agent.