Abstract:This paper describes the design of PDC reaming drill bit for deep hole. With the reference to full face drilling PDC drill bit design theory, the theoretical researches on the design of crown profile and equalcutting volume theory are made; using threedimensional software integrated with Pro/ENGINEER CAD/CAM/CAE ion, the PDC reaming drill bit 3D modeling is completed. The parametric design improves the accuracy of PDC bit cutter placing, and PDC reaming drill bit can be applied in all kinds of reaming construction with very broad application prospects.

Abstract:For engineering geological drilling operations at sea, mud protection is necessary in sand, loose rock and weathered rock stratum, and the best effects can only be achieved by using the mud prepared with fresh water. By establishing a two-process model of mud making with seawater, primary pure water produced by the first-stage process device can meet the water standards for high-performance mud; ultrapure water suitable for drinking is output by the second-stage process with the residual salts being removed. The designed seawater mud making device, including seawater pretreatment and reverse osmosis devices, EDI separator and maintenance control system, breaks through the the restriction of platform space, load, fresh water cost and other factors in the offshore exploration, the exploration cost is effectively reduced.

Abstract:Borehole bending deflection distance is an important quality index in geological drilling project. Borehole bending and full-angle-half-distance method is introduced in this paper, which is most commonly used in borehole bending calculation model. By the describtion of the spatial position of each measuring point on borehole axis on basis of three-dimensional coordinate system and by means of three-dimensional geometric method, a formula about deflection distance in any depth of borehole is derived, and the influence degree of vertex angle and azimuth’s change to the deflection distance is discussed with a calculation example.

Abstract:Yuanye HF-1 is the first shale gas pre-exploration horizontal well in Yuanba block of Northeastern Sichuan. Based on the analysis on the difficult points in engineering geology, the third spud section structure was optimized; rational drilling method, drilling fluid system and drilling process measures are selected to form a set of shale gas horizontal well drilling technical scheme suitable for this area. The well is drilled to the objective layer with drilled depth of 4982m, horizontal displacement of 1421.73mm, drilling cycle of 168.88d, average penetration rate of 3.07m/h and the three open well diameter enlargement ratio is only 4.82%.

Abstract:In order to carry out the comprehensive planning in Brahmaputra Basin and monographic study on water resources development and conservation, 4 boreholes with depth of 200～300m were laid out in Lilong dam site and Benzong dam site of Brahmaputra main stream. This paper discusses the exploration and hole-building processes in deep overburden layer of alpine region in Tibet based on the successful experience obtained in the above 4 boreholes drilling.

Abstract:The formation conditions are quite different in Yechangping mining area; a lot of problems have been exposed in the initial construction by applying the previous successful experience and drilling technologies: the upper block falling and serious sticking cause borehole abandonments; especially in weathered rock sections with strong hydrophily, hole wall collapse, splitting failure on formation by high pump pressure and the formation being damaged by pressure lead drill bit burying. 5 abandoned boreholes cause huge economic loss and seriously affect exploration progress. After the improvement of drilling operation, the drilling hole rate has been significantly raised, 46 holes are completed, and all being fine holes, the deepest drilling depth reaches 1501.54m and efficiency per rig is improved obviously from 130m to 252m. In this paper, analysis is made on drilling method, flushing fluid property and borehole structure, some problems in construction and corresponding causes as well as countermeasures are introduced and construction experience is summarized.

Abstract:The paper introduces the construction technology for ZK744 in Jinlongshan mining area of Shaanxi, mainly elaborates the wall protection technology with flushing fluid and summarizes the lessons from failure and the successful experiences in the early stage and the later stage of construction respectively, which can be the reference to borehole construction in the similar mining area.

Abstract:AD205H is the first simplified three-spuding horizontal well in Al-ahdab oilfield of Iraq. Upper water sensitive mudstone is easily being dispersed and mud forming with diameter reducing; high pressure salt water layer, chert nodule beds and oil reservoir with high content of limestone increase the construction cycle and restrict the application of horizontal wells in this area. Aiming at the above difficulties, evaluation tests on the drilling fluid inhibitory, temperature resistance, salt resistance, anti pollution were made, the mixed oil polysulfonate drilling fluid system was developed. Field application shows that polysulfonate drilling fluid system has strong antipollution ability with stable performance in the construction process, which has strong inhibition on water sensitivity mud of the upper part and very good sealing effect for lower limestone formation; downhole accidents are reduced.

Abstract:The recirculation being paid attention in the geothermal exploitation can effectively protect the valuable geothermal resources. Recirculation effects are good in bedrock fracture geothermal exploitation in Tianjin, but not in Guantao formation, on which the pertinence study is made. The paper introduces the perforating technology in well completion, stable non-pressure recirculation volume reaches to 101m3/h with water taking effect being ensured at the same time.

Abstract:Air reverse circulation continuous sampling drilling technology is used for the exploration construction in open-pit mine. The causes of string sticking encountered in drilling is analyzed and the corresponding operation rules are determined in order to prevent sticking accident and by the construted auxiliary holes and milling technology, good results are achieved in sticking accident treatment.

Abstract:By the full use of JJC-1D quality detection system for hole quality of bored grouting pile, the range of measured hole diameter is extened. The hole inclination detection accuracy is improved by 4-azimuth detection method, the actual measurement of mud resistivity and sediment (high concentration mud) resistivity are comparatively analyzed in laboratory to obtain the experience parameters for detection on sediment thickness, by which good results are achieved.

Abstract:Rock embedded bottom-enlargement pile is a kind of end bearing pile, the thickness of sediment at the pile bottom has direct impact on the bearing capacity of pile foundation. The paper introduces an engineering of rock embedded bottom-enlargement pile which is constructed by sediment clearing with rotary drilling machine. It is proved by practice that sediment cleaning with rotary drilling machine can reduce construction procedure, improve the efficiency of construction and ensure the construction quality of pile.

Abstract:To the combined support system of soil nailing and pile-anchor for deep excavation, by the numerical calculation with FLAC3D software, the analysis is made on the influence of excavating process to displacement, stress and stability safety factor of support system structures, as well as the laws of ground deformation caused by excavation. 2 retaining schemes are considered; one is the retaining structure composted by 2 layer soil nails and 1 pile-anchor, the other one is the retaining structure composted by 4 layer soil nails and 3 pile-anchors. Based on the calculation results, comparative study is carried out on the support effects of different schemes to analyze the feasibility of the support scheme. The paper presents the comparison of support effects between the adopted scheme in the engineering and field measured results.

Abstract:The ground vibrationin in LNG storage tank foundation reinforcement of Caofeidian industrial zone is studied. By the statistical analysis, frequency domain analysis and the law fitting based on dynamic compaction vibration observation records in the field, the attenuation law of ground vibrationin caused by dynamic compaction, the variation of amplitude (vibration velocity) changing with the frequency of tamping and the main frequency variation of dynamic compaction are shown. The safety assessment of vibration is made on the existing seawall and gas tank projects around the field to provide theoretical support for the selection of dynamic compaction parameters, which also makes up the researches on the similar ground vibration characteristics in China.

Abstract:Buried heat pump technology is a new energy utilization technology for heating and cooling with shallow geothermal energy collected below the surface within 200m in depth, but which is restricted in the application in carbonate rock distribution area of Guizhou mainly because of the difficulties in vertical heat exchange hole building in Karst formaton and the high cost. The paper introduces the successful experience of utilization of shallow geothermal energy by a combined heat exchange system of vertical buried type and foundation pile spiral coil type in carbonate formation with Karst general to medium development, which can be reference for the application and promotion of buried heat pump technology in Karst areas of Guizhou.

Abstract:Powerhouse of TALEGHAN water control project of Iran is located in the mountains on the left bank of reservoir area. With high seepage pressure of 80m water head height, the construction was difficult because of extremely high requirements for seepage control on underground powerhouse. On this basis, targeted wet grinding cement grouting was applied in weak permeable layer with good effects. The paper mainly introduces the construction method of enclosed curtain grouting for underground powerhouse, which can be reference to the similar projects.

Abstract:In the slag formation of a pile foundation engineering of Chengde, dry hole-forming operation could not be applied in extremely thick fill soil layer, double liquid grouting method was used first for consolidation and then dry hole-forming construction was made by rotary drilling rig. The practice shows that this method is feasible in the loose extremely thick fill soil consolidation with good treatment effect. In this case, the ratio and volume of solution are the key factors. The self-stable ability and the bearing capacity of the soil are improved by consolidation.

Abstract:Jining city sewage interception diversion is an important project for south to north water transfer trunk in the east line, 5.9km pipelines should be laid from the Jining City sewage treatment plant first, then by the open-channel hydraulic system, to diverse reclaimed water into the water storage area to ensure no reclaimed water entering the trunk during south to north water transfer. The pipeline is constructed through the old canal and Guangfu River of southern Jining. Guangfu River is a flood channel, pipe traction and burying technology in trenchless directional drilling was used without affecting the original function of the channel. Combined with the engineering example, this paper introduces the pipe traction construction technology in trenchless directional drilling.

Abstract:By the experience of slope support for hillside site leveling, the study is made on the applications of counterfort prestressed anchor retaining wall, slab anchor retaining wall, lattice frame anchor retaining wall and bolt-shotcrete support in slope support, which can be provided as reference for the design and construction of similar projects.

Abstract:The sintering temperature being lowered and matrix material being selected in the manufacturing process are the good way to reduce the effect of sintering temperature on the properties of diamond and improve matrix performance of cutting tools. Diamond impregnated matrix samples with an appropriate amount of nano-nickel powder were prepared by the vacuum hot-pressed. The hardness, strength, friction properties and microstructure were investigated in order to evaluate the feasibility of this method. The results show that for WC-based diamond impregnated matrix, HRC of the matrix containing nano-nickel powder is increased by 11.9%, bending strength by 18.4% and abrasion ratio by 44.5% than those of the matrix without nano-nickel powder respectively; and for Fe-based diamond impregnated matrix, HRC of the matrix containing nano-nickel powder is increased by 19.5%, bending strength by0.2%, and abrasion ratio by 33.3% than those of the matrix without nano-nickel powder respectively. So adding nano-nickel powder to the matrix can both reduce the effect of sintering temperature on diamond and improve cutting performance.