Abstract:Formation natural tilt, bottom hole assembly, drilling parameters are the main factors to affect the change trend of inclination orientation of the designed hole track. According to the formation level space grid data, the calculation methods of the formation dip and the dip direction were established; mechanical analysis was made on the relationship between the typical deviation control drilling tool assembly and drilling parameters. The application effects show that the real drilling trajectory is almost the same to the designed one.

Abstract:The leakage is serious in the complex formation of a water source project in Huozhou coal-electricity group of Shanxi. Drilling against circulation loss was adopted at first with high construction cost, but it was still difficult to guarantee the project progress. The drilling difficulties in leakage formation were solved by are-foam drilling with high drilling efficiency and low drilling cost. The paper introduced the technology of air-foam drilling in the water source well construction and analyzed the drilling effect and the drilling cost with comparison.

Abstract:Su 77 block is located in a fragile ecological environment of half desert and half grassland, cluster wells can accelerate productivity construction, lower the drilling cost, protect environment and is convenient for gas field maintenance management. According to the drilling difficulties in Su 77 block and based on the formation natural deflecting law and azimuth drift pattern, optimization was made on platform deployment, well profile, bottom hole assembly, PDC bit selection, drilling fluid system and its performance maintenance, a set of matching technologies was formed for optimized and fast drilling with cluster wells suitable to Su 77 block, the penetration rate was effectively improved, drilling period and well construction cycle in platform were shortened and productivity construction was accelerated. A drilled depth of

Abstract:K-Mg salt deposit is widely distributed in Gammon Province of Laos, which belongs to soluble solid K-Mg salt deposit, the ore seams mainly spread in Cenozoic paleogene salt bed and mainly with sylvite and carnallite. By the systematic analysis on the engineering geological characteristics of soluble solid K-Mg salt, a set of drilling construction technology in soluble solid K-Mg salt deposit was probed out. The study on coring and core protection, leakage prevention and the control and borehole sealing technology was presented.

Abstract:The paper briefly introduced the complex features of hard and broken formation of detailed investigation district in Hongshan iron mine as well as the lithology; summed up the experience of wire-line coring drilling technology in the complex broken formation; emphatically analyzed the treatment of broken & leakage, collapsing & falling and hard & slipping formation in aspects of borehole structure, drilling tools & drilling parameter selection and the flush fluid selection & preparation. The paper also discussed technical measures to ensure coring rate and prevent borehole inclination in complex formation, by wall protection and leaking stoppage, flush fluid ratio improvement, bit matrix hardness adjustment and the improvement of complex formation drilling environment, the drilling efficiency was increased.

Abstract:With the sustainable development of deep volcanic rock and conglomerate gas reservoir in Daqing oilfield, there is an urgent request of developing deep gas reservoir with horizontal well technique. The paper described the geological characteristics of deep volcanic rock and conglomerate and the features and difficulties of horizontal well in volcanic rock and conglomerate. Research was made on bit selection, well trajectory optimization, well structure optimization, BHA selection and the under balanced drilling pressure value control with several field test wells completed. The average penetration rate is 2.79m/h in Xushen-P34 well, and a series of horizontal well drilling techniques has been developed for exploration and exploitation of the deep volcanic rock and conglomerate gas reservoir in Daqing oilfield.

Abstract:According to the design requirements and geological characteristics, rotary drilling, mud pump positive cycle, cone bit, pressure by drill collar processes were adopted in the construction of Well WH-1. The formation structure and spatial distribution of aquifer within logging depth were got through geophysical logging. Good plugging effect was obtained by mud density reduction, viscosity enhancing, mud thickening and adding an appropriate amount of blocking agent. The pumping test shows the good water yield ability, good water abundance in geothermal reservoir aquifer and the water temperature is not affected by air temperature. The water temperature loss is small in the well flow test, which proves that the drilling and completion technologies are rational. The paper introduced the Well WH-1 about its drilling and completion technologies as well as pumping test results.

Abstract:The low drilling efficiency has been a drilling problem in compact and weak abrasive formation, which is partly improved by casting abrasives and adjusting the technical parameters of the bit and completely solved by the successful application of hydro-hammer. The serious wall collapsing is overcome by barite powder and cement grouting technologies in the complex collapse, leakage and instable water gushing formations.

Abstract:Combining the production and scientific research, 8 water wells were constructed with normal circulation drilling method and 11 water wells were constructed with pump suction reverse circulation drilling method in groundwater resource region along the Yellow River in Zhengzhou. By the analysis on the efficiency and economy of these 2 different drilling technologies, the conclusions were got: in groundwater resource region along the Yellow River in Zhengzhou, the best well depth should be smaller and larger than 140.75m respectively with pump suction reverse circulation drilling method and with normal reverse circulation drilling method each. The conclusions can be the reference for water well construction in the similar area.

Abstract:Underground horizontal directional borehole in coal mine has more technological advantages than the conventional bore hole in gas drainage. This paper analyzed the gas control technology of working face in conventional borehole of Dafosi coal mine with the disadvantages being pointed out. Based on the analysis on the drilling technology and borehole arrangement of long directional borehole and the field application, the conclusion is that the directional borehole is good for the centralized regional gas drainage in the working face. The data of the gas drainage proves that the gas drainage efficiency of the directional borehole is better than the conventional borehole.

Abstract:The paper introduced RE400 crawler hammer drilling machine about its developing process and overall structure placement design. The functions of main components, structure features, working principles, testing and the application are presented.

Abstract:The structure and the characteristics of portable fully hydraulic drill are introduced. Analysis and discussion are made according to the problems of electromagnetic valve burning out, insurance loss and electric circuit falling off caused by resonance. The solutions for these problems are put forward.

Abstract:In order to solve the water disasters caused by freezing holes of full-depth bedrock frozen shaft in western China, analysis was made on the form of annular water-transmitting channels in freezing holes and the in-rushing water mechanism with the case of water disasters control project of Hujiahe coal mine. The paper presents an innovating counter-flow water diversion grouting sealing technology and introduced its principle and construction process. The project practice proved that this technology can effectively and quickly control the in-rushing water disaster of freezing hole.

Abstract:The compound use of diaphragm retaining walls and cutoff wall with self-setting grout is a novel supporting technology in deep foundation pit construction, which has good effect in seepage control with low cost. Based on the project example of deep foundation pit of Walsin Lihwa AB site, the application feasibility and the advantages were demonstrated in mechanical behavior， seepage control and the cost. Furthermore, the paper specifically introduces the construction process and technical points.

Abstract:Pile-anchor retaining and compound soil nailing support are the common schemes for the foundation pit supporting. In the view of the economy and deformation control, each scheme has its advantages and disadvantages. With the engineering case, the discussion was made on the safe and economical supporting scheme by composition of soil nailing wall with vertical micro-pile and pre-stressed anchor, and the supporting effect was verified by the deformation monitoring data.

Abstract:CFG pile has many successful engineering cases in ground treatment of high buildings. Composite modulus method is recommended by “Technical Code for Ground Treatment of Buildings” JGJ 79-2002 in deformation calculation with stress ratio method formula of composite earth layer compression modulus. In this paper, a modified formula of area ratio method is put forward based on the loading test data of composite foundation. The composite foundation settlement value calculated by this method has a good agreement with the building settlement observation value.

Abstract:Based on the original data of bored pile static loading test and stratigraphic data, combined with the related specifications and using the inverse analysis method, the ultimate end resistance standard value qsik and ultimate lateral resistance standard value qpk of each stratum were determined. Pile testing results can be applied to the pile design in any length and any diameter near the construction site.

Abstract:There are cracks in new built residential buildings due to the uneven settlement of the foundation. Based on the geological conditions and construction site investigation, pressure grouting was selected to protect the buildings. To solve the construction difficulties in narrow site, the technology of grouting through a perforated tube shot into ground by an air hammer was selected, which also avoided the destruction to environment around existing buildings and the foundation by static pressure pile and jet grouting pile construction.

Abstract:With the engineering practice of the large diameter ice transmission well of a coalmine, the construction technologies of large diameter ice transmission well were summed up. The relative technologies in the drilling construction were discussed about the equipment selection, bottom hole assembly for pilot hole & reaming, the pilot hole, step reaming and well cementing; and the newly developed insulating case and casing method by lifting bar in cutting-holes and floating plug were also presented.

Abstract:The investigation of rock slope is easier than that of soil, because geotechnical structure is not that complex. But for the consequent rock slope with weak interlayer, the determination of shear strength indexes of weak structural plane has been difficult to grasp. Combined with the engineering case, according to the comprehensive evaluation by direct shear test, standard lookup method and inverse algorithm, shear strength indexes of weak structure of rock slope were determined, and detail introduction and analysis were made on each method to be reference to similar engineering.

Abstract:Engineering and technical personnel are always been plagued by drilling the hole and the rapid construction of technology In loose broken, serious overhead formation. In order to solve low rate of drilling anchor hole in the dam accumulation body, carrying on the solid wall grouting test, adding a certain amount of accelerating and calcium sulfate to Ordinary Portland cement, Improving the slurry setting time and compressive strength. As a result, It plays a good solid wall grouting effect, Improves the efficacy of the construction of anchor cable hole, and get a good use in the slope control.

Abstract:Taking the example of underground channels of 14-line in Beijing subway in saturated fine sand-medium sand layer, the paper illustrated the application of horizon-oriented high pressure jet grouting method in the subway construction in saturated fine sand-medium sand layer. The practice shows that this method can not only avoid unsafe conditions, but also can stop water.

Abstract:Based on the analysis on the affecting factors produced by blasting dust and fume in exploration tunnel and the characteristics, the paper summarized the technical tests and the testing results of blasting dust and fume control, which could be the reference to blasting construction for exploration tunnel and traffic tunnel.