Abstract:With the continuously development of deep and peripheral prospecting, a new type of deephole drilling rig matched with monitoring system of drilling parameters is required, and all hydraulictop head core drilling rigs will be the main drilling rigs for deep drilling in future. CUG-2 monitoring system of drilling parameter monitor was designed by China University of Geosciences to match the 2000m all hydraulictop head core drilling rig specially. This article introduced the design characteristics and testing parameters of CUG-2 system and emphatically introduced the parameters detection principle which was different to the principles for normal rotary drilling and shaftdrilling rigs as well as lectotype installation of sensors, including hole depth, drill speed, torque, horsepower and flow out rate.

Abstract:Built with a magnet beacon sub, a magnetic signal acquisition unit, a magnetic sensor probe and a set of professional analysis software, SmartMag target-hitting guidance system interprets the geometry position correlation between the drilling bit and the sensor set in the target borehole and finally guides the drilling reaching or avoiding the target area. The paper introduced industrial test trial on SmartMag targethitting guidance system. Based on the earlier researches, the successful operation results have been achieved during the practical test trial of the system.

Abstract:Foaming breaking is very important for environmental protection and economic development in foam drilling, but current foam breaking device cannot meet the requirements. Further study was made by establish the indoor test platform for foam breaking device, the relation between pressure and foam breaking rate was determined; numerical simulation was made on floating pressure change in foam breaking device by VOF model of FLUENT software, and the result was the same to the experiment.

Abstract:Research analysis was made on the water-quench heat treatment for petroleum drill pipe joint. The paper introduced the comparative test of hardness and hardness uniformity by water-quench and oil-quench processes; and also introduced the effect of quenching liquid to the cooling rate of drill pipe joints under different conditions. The research result shows that the waterquench process can improve the degree of martensite of drill pipe joints with the quality of quench enhancing.

Abstract:Starting from the basic requirements of wireline coring diamond drilling technique, film forming theory and technology was applied to develop a new film forming additive for water-based filming slurry which was proved to have strong ability of restrain and wall protection in high water sensitivity formation with the improvement of drilling efficiency. The paper introduced the filmforming mechanism of waterbased drilling fluid, the development and engineering application of X-1 water-based filmforming additive.

Abstract:The analysis was made on the theory features and technological parameters of composite convey drilling cutting technology; and the matching equipments, application conditions of that in soft and were introduced. The good application effect was obtained with composite convey drilling cutting technology in soft and.

Abstract:According to the cable opening and hole construction in Yangchangwan coal mine, the optimum technology and technical requirement and effective prevention & treatment on broken leakage formation for special large diameter drilling construction in Ningdong mine were summed up. Advanced non-return valve cementing technology was successfully applied for large diameter borehole cementing process, and treatment methods of large diameter downhole trouble were put forward.

Abstract:The paper detailed the difficulties of feeding batching mine construction and the countermeasures according to the feeding batching mine engineering practice of TZK1 and TZK2 in Fujian. By the optimum combination of drilling equipments, based on the pendulum assembly principle, assisted by wall protection & leakage stoppage, with the development of separation-type grouting valve, the construction was fulfilled with case setting and grouting cementation.

Abstract:Hydration swelling in coal measure strata with subsidence pool forming was the main difficulty in drilling construction in Yanjiang mine of Changbai; and hole collapsing, block-falling and deep limestone alteration formed karst cave with serious leakage and long construction period. Field analysis was made to solve the above problems by specific technologies.

Abstract:Because of the blockfalling, collapsing, local oversizing and more sediment in water sensitive formation, drilling broken and burying drilling occurred in the boring construction in a phosphate mine in Guizhou. Small diameter cone bit positioning deflection by wireline coring with steel ball supporting was used to solve the problem economically.

Abstract:The Republic of Mali in the Western Africa is a serious watershortage country. This article introduces the technology of smallerdiameter outlet well (forage) drilling and largerdiameter storage well (puit citerne) drilling, connection of outlet and storage wells, disinfections and water pumping experiment according to the 147 wells matching engineering in Mali and analyzed the construction problems possible encountered with the solutions. The matching engineering of smallerdiameter outlet well and largerdiameter storage well is a good way to solve the people and livestock drinking water difficulty for watershortage area in Africa, which is worth popularizing.

Abstract:The causes of complex strata formation were analyzed; difficulties in the wall protection and coring were solved by technical research, flushing fluid development and implement bit development, the construction efficiency and borehole construction quality were improved.

Abstract:Cutting drilling pipe and the assembly with eccentric cutting knife is usually applied in the large diameter engineering borehole construction; and in geological drilling, eccentric cutting knife can used to cut the casing pipe or coring barrel. The paper described a successful treatment practice of complex borehole accident in a drilling construction in Guizhou, the drilling pipe was cut down from the outside with eccentric cutting knife, and introduced the technical measures and the attentions.

Abstract:The paper introduced the well protection and well washing technology with drilling mud by mechanical drilling construction method; the drilling diameter was 8.3 m, the depth was 286 m and the thickness of gravelboulder was up to 251 m. The preparation of drilling mud, the selection & adjustment of mud performance parameters in different formations, mud purification and well washing were illustrated.

Abstract:The dam foundation of Lujichang hydropower station was built on overburden formation with interlayer of sand gravel, block stone and shaly fine sand formation, the bearing capacity of natural foundation could not satisfy the design requirement; 180 kW high power electric vibroflotation device and drilling rig were applied to solve the construction difficulties in complex formation and deep vibroflotation consolidation.

Abstract:The large diameter deep mixing pile has the advantages of high strength, small deformation and good anti-permeability. It is widely used in areas of foundation strengthening and water-sealing engineering. Based on the deep foundation ditch engineering in abundant groundwater region, the water-sealing function with large diameter deep mixing pile was proved by the combination of design program, engineering construction and the excavation monitoring result.

Abstract:Based on the investigation on the distribution of liquefied saturated sand in the planned district in Langfang of Hebei Province and study analysis on the hazard, vibro replacement stone column, pile foundation and CFG pile composite ground technology were suggested to control the saturated sand liquefaction.

Abstract:The paper introduced the whole section compact-shock borehole building technology about the technological process and common accident treatment with a case of whole section compact-shock borehole building technology for large diameter inclined steel-pipe pile, the successful practice proved the wide application prospect of this technology.

Abstract:The paper introduced the construction method of large diameter underreamed bored pile with engineering case, analyzed the main characteristics of the project and discussed the main technical measures.

Abstract:Because of the high ground stress of underground powerhouse in Jinping first stage hydropower station, the local rock crushing, layered split damage and surrounding rock depth deepening & displacement enlarging occurred with the release of stress and redistribution. In order to realize anchorage support effect as soon as possible to ensure bracing surrounding rock stability and engineering safety, the original design of in-situ concrete anchor pier was adjusted to be steel anchor pier with good quality and progress. The paper describes the steel anchor pier construction process, quality control points and the comparative analysis on ergonomics with concrete anchor pier.

Abstract:The paper introduced the groundwater level control by continuous small pumping amount in multiple well points for the foundation pit construction with full water recharge and large drawdown, which made the curved surface of dewatering funnel flat, reduced the land subsidence around the foundation pit and obtained good dewatering result.

Abstract:By the concrete pumping case in a tunnel, the paper analyzed the existing problems of long distance concrete pumping in inclined shaft and the mechanism of pipe blocking with the solution; and also discussed the design and operation process.