Abstract:During phase 1（2001—2008） of Japan Methane Hydrate R&D program（MH21）and later, Japan participated in NGH production tests in permafrost zone in Canada Mallik and US Alaska; In 2000 and 2004, a exploration well and a multiplewell coring project were respectively executed. Since the beginning of phase 2（2009—2015） of the MH21, Japan had strenthened the drilling and coring studies for methane hydrate reservoir in Eastern Nankai Trough with CDEX hybrid PCS, as well as comducted fine analysis and characterization for coring samples of hydratebearing sediments under pressure with Pressure Core Characterization Tools（PCCT）, etc.; The strategy of Environmental Impact Assessment（EIA）study was put forwaded, and EIA methodology seriously was applied, as well as monitoring systems for offshore production tests, including Methane Leakage Monitoring System (MLMS), Seafloor Deformation Monitoring System (SDMS) etc., were deploied. Japan completed offshore methane hydrate production testmethane producrd from deepwater hydrate layers in the Eastern Nankai Trough in 12—18 of March, 2013. Cumulative volume of gas production was 120000m3 in 6 day, average volume of gas production——20000m3/day. This is the first offshore methane hydrate successful production test in the world, and a milestone in NGH development history in the world. At the same time, the NGH commercial production will be internationally a very difficut and long period.

Abstract:Oil and gas resources survey is one of the important contents of the 13th Five-Year Plan in China. In 2016, China implemented 54 oil and gas geological survey wells, 36 deployed in 2017, most of the wells uses mechanical core drilling technology. Based on the characteristics of oil and gas geological survey wells and mechanical core drilling technology, this paper summarizes and analyzes the technical difficulties faced by gas geological survey wells from the aspects of formation characteristics, well control, cementing, logging and downhole complex problems, and puts forward targeted solutions. The research results of this paper can provide technical reference for the relevant management and operation personnel, and provide reference for the research and development of drilling technology for oil and gas geological survey.

Abstract:Being the deepest small diameter geological core well in Tibet area, Ni-1 is an oil and gas investigation well with the final depth of 2001.1m. The discussion is made on the construction equipments selection, borehole structure design, coring technology, flushing fluid wall protection and treatment scheme for drilling in complex formations, the drilling construction experiences in high altitude area are summed up with the analysis on the existing shortcomings, which can provide some experience for future drilling construction in this area of Tibet.

Abstract:In the second production phase of Fuling shale gas field, the difficulties in fracturing treatment came along with the increasing buried depth, especially under the condition of only 93MPa limited pressure for equipments, acid reducing effect was not obvious in high pressure in deep well construction, which severely restricted the implementation of the later fracturing measures. By the analysis on the main causes of unsatisfactory acid reducing effect, the main factors affecting the acid treatment effect are studied through indoor and field tests on this basis. The tests show that the increase of acid treatment displacement, the increase of acid concentration and reasonable optimizing the amount of acid are helpful to improve the acid treatment effect. The optimization suggestions are put forward, which has important significance to the later fracturing construction of deep shale gas well in Fuling shale gas field.

Abstract:Nanchuan Pingqiao shale gas block is another productivity construction block after Fuling shale gas field of Sinopec in southeastern Sichuan basin. On the basis of analyzing the characteristics of the well deployment and geological conditions of this block, the leakage prevention and plugging technology, ROP increasing method, horizontal section drilling construction technology and some other problems in this shale gas block are summarized. Through the further study and optimization of platform deployment, wellbore structure, borehole trajectory, ”wells factory“ drilling model, drill bit selection, drilling fluid system, cementing technology and so on, an optimization design scheme of shale gas horizontal well drilling for the south block of Pingqiao is formed to realize the efficient development of shale gas productivity construction in south block of Pingqiao.

Abstract:Based on the drilling engineering of Zhunye well-4 in Jimusaer County of Xinjiang, this paper introduces drilling rig construction technological processes of shale gas parameter well in aspects of wellbore structure, drilling tool assembly, mud technology, coring technology and well deviation control. In view of the problems encountered in the construction process, such as the overburden layer of large-sized boulders, super-long open hole section drilling and lost circulation, through optimizing drilling tool structure, adjusting mud viscous shearing and lubrication performances, using bridge slurry plugging and other technical measures, the project was smoothly completed and the technical indicators meet the design requirements. The practice experience is summarized, which can provide reference for the large diameter drilling construction in this area.

Abstract:By using the drilling characteristics of continuous coring, the Quaternary stratigraphic sequence can be found out, and then top surface depth and fluctuation of bedrock determination, estimation models verification, geological structures research, delineating important contact relation between geological bodies can be realized and can be used for geological mapping. Based on the application of shallow drilling technology for geological mapping in Aohan County, a set of drilling technical methods combination is summed up, which is suitable to the geological mapping in shallow overburden area of desert steppe, the key points of technical operation for overburden area mapping by shallow drilling are presented, which provides technical support for geological survey and mineral resources exploration in similar landscape area.

Abstract:The complicated burnt rock formation in coal field firing zone is loose and fractured with fracture development, poor cementation and high formation temperature. Lost circulation, block falling and collapse are often encountered in drilling process, which lead to low construction efficiency and high cost; it is difficult to ensure the construction quality. And what are more serious are the challenges to construction technology and the people’s safety under the condition of high temperature. Aiming at this, by the combination of the technology of air DTH drilling with casing and the scheme of wall protection for high temperature drilling, the construction difficulties in coal field fire extinguishing engineering are effectively solved. The construction quality is improved and the drilling cost is reduced, this valuable drilling process is developed for coalfield fire extinguishing construction.

Abstract:Deep drilling is difficult in Banchang copper polymetallic mining area because of complex stratigraphic structure, strong alteration, fissure development and serious loss of circulation. Series of measures were taken to ensure smooth drilling in the construction process, including optimizing equipments, well structure design and drilling technical parameters, exploring reasonable drilling tools and casing gradation and using plant gum system find-dispersed low solid flushing fluid, which provide the technical support for the subsequent drilling operation and can be feasible experience for deep complex formations drilling.

Abstract:Natural gas hydrate is a potential alternative energy source that is stable under the conditions of certain low temperatures and high pressures. In the gas hydrate drilling, cooling and temperature insulating technology is one of the key technologies. Low temperature can inhibit the decomposition natural gas hydrate, which is very important for hydrate samples obtaining. This paper summarizes the research status of submarine natural gas hydrate sampler in cooling and temperature insulating technology at the first, the thorough investigation and analysis are made. Then the cooling and temperature insulating technology of Japan PTCS sampler and the sampler technology in China are described in detail, the related technologies are analyzed and summarized. Finally, the development of the cooling and temperature insulating technology for the natural gas hydrate sampler is summarized and predicted.

Abstract:The wire-line coring hydro-hammer drilling technology is widely applied for its advantages of effective drilling, largely increased round footage, prolonged bit service life, less auxiliary time and so on. Aiming at the specific requirements of the deep hole environment for the drilling tools in overall strength, safety, stability, service life, high backpressure adaptability and other aspects, this paper discusses a series of improvement and perfection of the original SYZX drilling tools. The production test proves that the improved drilling tools can fully meet the higher requirements for deep drilling construction.

Abstract:In order to study the application effect of air-lift reverse circulation in slag removal of diaphragm wall groove bottom, Fluent software was used to establish a two-dimensional model by means of simulated numerical analysis method. The placement depth of air-lift mixer, slag cleaning pressure of air compressor and slag diameter are taken as the research objects. It is concluded that the air-lift reverse circulation technology can effectively remove slag from the foundation pit bottom of diaphragm wall. The velocity of slag flowing out is 0.014～1.098m/s, the escape velocity of clay particles is faster than that of slag with other sizes; and the thicker the slag is, the more difficult the slag removal is.

Abstract:Taking Jiuzi toppling accumulation as the example, the stability analysis is carried out by using orthogonal experiment design and limit equilibrium method, and the range analysis and the variance analysis are made on the orthogonal experimental design results, all the analysis results show that the most sensitive influence factor of accumulation stability is cohesion c, followed by the friction angle φ, the accumulation weight γ has little effect on the stability. The dominant factors affecting slope stability are found out, which provides a reference for the landslide prevention and control project.

Abstract:Based on the case of dangerous rocks treatment project in Qixing Park of Guilin, this paper discusses the passive protection net design and construction for holding rockfall geological disaster treatment, which can provide reference for the dangerous rocks geological disaster control project in future.

Abstract:In order to adapt to the higher requirements of environmental protection, reduce CO2 content generated by wastes incineration and achieve the goal of energy-saving and emission reduction, a new process for wastes treatment by distillation is put forward based on a large number of experimental and computational studies. With the distillation method, carbon in the wastes does not participate in combustion with no CO2 and CO production, no destruction on the main components in the air and harmless production can be realized. The equipment for treating wastes by distillation consists of spraying system, rolling screen, stainless steel conveyor belt, tunnel type drying furnace and distillation furnace, drying coking furnace, crushing machine, hydraulic molding machine and some others. The main supporting processes include wastes dry distillation carbonization brick making and wastes triangle strip making technologies for reclamation. By this distillation method, CO2 emissions can be reduced in wastes treatment, zero pollution and total utilization in carbon slag reclamation have objective economic benefits.

Abstract:Asymmetrical multi-arch tunnel is a special kind of tunnel, which has complicated mechanical characteristics of geometric asymmetry and structural asymmetry. In the asymmetrical multi-arch tunnel construction, it is inevitable to pass through the bias terrain, and the bias has great impact on the stress state of the tunnel. The finite element method is used to make numerical simulation analysis on the asymmetrical multi arch tunnel under bias terrain condition. According to the forced deformation characteristics of surrounding rocks and lining structures of the tunnels with large and small diameters in the left or right, it is concluded that the small one of the asymmetric twin-arch tunnel should be designed at the deeply-lying side in the biased state, which provides a theoretical basis for the design of the tunnel.

Abstract:Based on the analysis on the causes, types and characteristics of the foreign current of the electric blasting network in the trenching blasting construction, the paper reviews the technology of preventing foreign current from interfering electric blasting network in trenching blasting construction and the research results. The achievements received can provide reference for the prevention of foreign current of the electric blasting network in the open blasting construction.