Abstract:PVC-U plastic pipe has the character of corrosion resistance, noscale, light weight and long service life. With the application of it in the exploration of shallow geothermal energy and water supply pipe well engineering, the corrosion and break, scale in metal well pipe, and difficulties in recharging by groundwater heat pump can be solved with maintenance cost reduced and service life prolonged. According to the demonstration engineering practice of shallow geothermal energy exploration and water supply pipe well in Zhengzhou City, the paper detailed the result of research on completion technology of PVC-U plastic pipe well, existing problems and the solution.

Abstract:This article obtains that the actual air injection volume should be 1.7 times of the theoretical down hole pressure according to the smallest kinetic energy of the key points. The experimental study on the air injection volume of horizontal well has good instructions before designs on the actual well drilling.

Abstract:According to the requirement of curtain grouting test in deep alluvium of Huangjinping hydropower station, research was made on highly-difficult technology of drilling with 76m long case, and the borehole structure with two-step casing was put forward.

Abstract:The paper introduced ZJ02-PJ02 butted wells of Xinwen Mining Group, the designed depth of the shaft and the inclined well were 94112m and 120300m, and these two wells was 25200m apart. The designed well structure was trisected with drilling and angle building equipment rationally installed. Tower-type pendulum drilling-assembly was used to prevent well deviation. Drilling pressure, drilling ratio, pumping volume and drilling fluid were selected according to the different situation in different well section, highprecision PST MWD and minimum curvature method were applied to calculate the drilling trajectory to guarantee the butting of two wells.

Abstract:It has great significance for the exploration work in low-temperature formation whether drilling fluid can maintain the normal performance below freezing point. Choosing ethylene alcohol as anti-freezing agent can meet the requests of drilling work. Study was made on low temperature resistance, liquidity, water loss character and preventing collapse capability of the drilling fluid, the amount of ethylene alcohol and other polymers are determined to meet the requests of exploration in low temperature formation.

Abstract:When the drill bit is drilling in the ultra-deep well, the flow field is in 3-D turbulence. The revolving and the surface curvature effect of the drill bit, as well as the following coriolis force and the centrifugal force make the flow field extremely complex in the ultra-deep well. Simultaneously, because the fluid medium mud belongs to two-phase currents of fluid and solid, which makes the test of internal flow field more difficult. The fluid dynamics software-fluent is applied in the ultra-deep well, based on the Navier-Stokes equation and the Reynolds stress equation model, several models are built in the paper. In the same conditions, the different results are stimulated by CFD simulation software Fluent; relative designing geometry parameters are optimized.

Abstract:The liner cementing under high temperature and high pressure in slim-hole is difficult. Well Long-16 is an important preliminary prospecting well in Chuanbei low and flat fold belt of Jiulongshan structure. The original 2159mm hole was designed to complete in Permian, but as well kick and circulation loss happened frequently, 1778mm casing was put down to cement the upper well section ahead of schedule. In this case, 1492mm bit was used to 598800m, and liner cementing was completed. Before cementing, oil gas showed strongly with drilling fluid density of 234g/cm3 and well temperature of 1396℃.

Abstract:Pore pressure, breakdown pressure and collapsing pressure are the bases of determining the casing programme, drilling fluid density and cementing and completion plan, and are important in the design of drilling engineering. Analysis was made on prediction technique of formation pressure in volcanic rocks, and for the first time, the advanced rock mechanics theory abroad was put into volcanic rocks in Qingshen gas field. 3 pressure prediction models were made, new correction methods were put forward according to these models and the characteristics of volcanic rocks in Qingshen gas field; 3 pieces of pressure prediction software were worded out, and the precision met the construction requests, it provides the reference for the design of drilling engineering in Daqing area.

Abstract:Traditional shaft construction method was difficult with slow progress and high cost. Drilling pilot shaft has the obvious superiority to greatly reduce the construction period and the cost for a project with channel in lower part. This article discussed the key technology of drilling pilot shaft for shaft construction by the case of Xiacun mine.

Abstract:Cyclone desanding technique is separating solid phase from drilling mud by centrifugal force, it can be used in geological prospecting, petroleum and gas industry and metallurgical industry. Automatic cyclone desander adopts cyclone-separating technique; retrieves the defects of traditional desander, such as unsatisfied solid phase separating effect and underflow channel blocking. So purifying quality of drilling mud and desanding efficiency are largely improved, the blocking area can be automatically broken with less working time and cost.

Abstract:In view of the defects of all kinds of swivels, a portable and practical easy-connected swivel was designed and produced. The paper briefly introduced the structure features and the application.

Abstract:A refined shear lag model is presented based on the analysis on the basic principle and mechanical characteristic of traditional shear lag model. The model is applied to the analysis on mechanism of pre-stress anchor bolt, shear stress between grouting material and rock and bond stress distribution model & loading-deformation characteristic were obtained. Stress analysis was also made on the model for some conclusions with practical significance.

Abstract:The paper introduced the main types and application range for support of foundation pit in Guangzhou district in recent years, and summed up the key points of design based on the analysis on each affecting factor.

Abstract:Comparison was made on several designs of deep foundation pit support about safety, cost and adaptability, so as to get optimized project plan to control displacement and settlement of foundation pit supporting engineering and protect around environment.

Abstract:Dewatering by radiate well can be applied in various formations with large scale of dewatering by a single well; it is an effective dewatering method with advances of fewer disturbances to construction, less area and convenient management. Based on the dewatering case of foundation pit of China National Film Museum, the design, construction and result of dewatering for large-scale foundation pit were introduced in this paper.

Abstract:A water-stop curtain was constructed with slope protection pile and jet grouting pile related for a deep foundation pit in Beijing. The paper introduced the construction technique of triple-tube high-pressure jet pile in this engineering and issues that should be paid attention and construction result.

Abstract:Deep foundation pit of a building in Zhuhai City was constructed in the ground, which original geological element was denuded deficient hills and manual filled and leveled. The depth of the excavation was 10 m, 10 ground displacement observation points, 4 lateral horizontal displacement observation holes and 4 underground water level logging stations were set, construction was carried under monitoring.

Abstract:Based on the engineering case, the paper introduced the reinforcement for foundation with collapsible miscellaneous soil-filling by pressure-grouting and presented the test research that was a necessary meaning to ensure the reinforcement result. Deformation measurement data showed this method could not only improve the bearing capacity of the foundation, but also reduce the differential settlement of buildings.

Abstract:This article makes a comparison on the characteristics and construction cost between rotary drilling rig and rotary table rig, and puts forward the method of combination construction of these two types of rig. The successful application provides the reference to similar engineering. And applying conditions for rotary drilling rig and problems in the application are also presented.

Abstract:This article mainly introduced the construction design for the underground abandoned pipe, which supplies important accordance for the construction practice in this project, and also provides references for other similar filling project of underground spaces.

Abstract:In construction of pipe jacking, the wall of working shaft and soil body behind the sidewall offers enormous supporting force to a lift. But for ultra-shallow-underground-pipe jacking, the limited discrepancy between ground level and the bottom level of the shaft produces the difficulty for the designing and construction. The paper detailed construction technology of working shaft for pipe jacking in ultra-shallow shaft with a practical engineering, including some key points of pre-grouting, ring beam construction and top-down construction methods.

Abstract:The pulsation-jet nozzle was designed according to the principle of self-excited oscillation pulsed jet, and was applied in PDC oil drilling head. The application in different area, formation and diameter showed that compared with ordinary PDC bit, penetration rate of self-excited oscillation pulsed jet PDC oil drilling head increased 10%-30%, the service life and application range was largely prolonged and enlarged, and the size of rock debris was increased by 2-4 times without any auxiliary equipment.

Abstract:According to the blasting demolition case of existing workshop of Longting cement plant in Kaifeng City， the paper introduced the design principle and construction requests of demolition of frame-structured building by directional blasting.