Abstract:By the application practice of flush fluid for scientific drilling in the Luobusa of Tibet, combining field laboratory tests and mud type, mud formula, performance characteristics and its use in the actual production process, a flush fluid formula is summarized, which suits for complex formations of collapse, broken, serious leakage and hole diameter shrinkage in Chromium iron mining area of Luobusa. The paper elaborates the application of different flush fluids and the existing shortcomings; explains the different effects of mud with the same formula in different drilling conditions, which provide some references to the selection of flush fluid formula for deep drilling in complex formations.

Abstract:Although the cost of oil base drilling fluid is extremely high, it always has incomparable advantages compared with water base drilling fluid for the complex formation drilling in offshore. According to the difficulties encountered in 3 complex blocks of an oil and gas field in western South China Sea, corresponding oil base drilling fluid formula, performance and maintenance methods are presented, the processing methods for oily drilling cuttings in different sea areas are discussed. The drilling practice proves that oil base drilling fluid is not only a very important guarantee for smooth drilling operation in easy-collapsed wells, HTHP wells and super-low pore pressure adjustment wells in old oil field, but also has good reservoir protection performance for oilfield exploration and development.

Abstract:When the temperature and pressure are higher than 31.10℃ and 7.38MPa respectively, CO2 becomes into supercritical state, the density of supercritical CO2 is similar to that of liquid, but the viscosity is higher than that of air and nitrogen gas, so it can drive the down-hole motor working and carry the cuttings out of the wellbore, which comes into being supercritical CO2 drilling technology. Supercritical CO2 drilling technology has the advantages of fast rock breaking speed, good gas and oil protection and high displacement efficiency, especially has the obvious advantages in the unconventional oil and gas reservoirs development. There are broad prospects for the application of combination of supercritical CO2 drilling and coiled tubing drilling technology in the pressure under balance drilling and pressure depletion formation. The paper introduces the supercritical CO2 technology about its physical characteristics, drilling process and the technical advantages as well as the related research progress and development trend.

Abstract:In the process of the fourth hole (WFSD-4) of Wenchuan earthquake scientific drilling project, the drilling fluid was contaminated by CO2 seriously and the drilling fluid performance was deteriorated with sticking & cutting increasing and poor liquidity, by which normal drilling was affected. Through the analysis on the influence factors of CO2 on drilling fluid and according to the mechanism and characteristics of drilling fluid contamination by CO2, the contamination rules, performance characteristics and corresponding treatment measures are summed up based on the laboratory experiments and field application cases: with pH value of drilling fluid keeping, acid radical ion etc. in drilling fluid can be removed by lime.

Abstract:Low drilling efficiency in water well and geothermal well is one of the main factors affecting development and utilization process of water resources. On the basis of the analysis on the causes of low efficiency of water well and geothermal well drilling, according to different affecting factors and combining with the production practice of construction, the paper discusses the optimization of drilling process and improvement of drilling equipment, proposes the popularization of fast drilling technologies of pneumatic DTH hammer drilling and air-lift reverse circulation drilling for groundwater development.

Abstract:According to the broken, leaking, clasping and block falling limestone formations of the bauxite in Guizhou, the combined drilling technology of drilling with casing and wire-line coring was used to overcome the difficulties of conventional drilling methods, ZK3369 hole drilling was successfully completed with good result. On the basis of the analysis on the construction difficulties, the paper introduces the combined drilling technology of drilling with casing and wire-line coring in the broken, leaking, clasping and block falling formations.

Abstract:The paper introduces the application field and engineering characteristics of super large diameter borehole drilling and elaborates the advantages and disadvantages of different construction methods. By the analysis on field case, the equipment configuration, technical process and control measures for key processes of several drilling methods are demonstrated systematically and some attentions in the construction and operation are summed up.

Abstract:The paper introduces the use of effective coring methods and wall protection & leakage prevention measures to deal with technical difficulties of drilling in Makeng mining area of Fujian, and sums up a set of drilling technologies for Makeng mining area. The practical and referential construction scheme is formed for mining area.

Abstract:Dashen CP302 is the first deep slim hole under-balanced casing window sidetracking horizontal well which is independently designed and constructed in Daqing oilfield, and has concentrated all the technical characteristics and the difficulties of deep well, slim hole well, under-balanced well, casing window and horizontal well. By optimization on the technical scheme, whipstock with duplex milling and cone milling window is determined. The paper introduces casing sidetracking technology and well trajectory control technology in detail.

Abstract:Based on the practice of wire-line core drilling for deep hole of ZK6801 of Mujicun copper mine in Hebei, the paper sums up the application and experience of diamond wire-line core drilling technology in the complex formation and focuses on the application principles of wall protection with mud, cement slurry and casing.

Abstract:Manual centering and placing drill pipes are the main methods of traditional way to load and unload drill pipes, which is inefficient with high labor intensity. To improve this unfavorable situation, BG mechanical pipe handler is developed to match with hydraulic rigs with tilting power head, it can accomplish loading/unloading and placing drill pipes mechanically by coordinating the manipulator and the clamping holder with tilting power head. This paper introduces in detail the structural design of the manipulator and rotary driving selection, the structural design of the clamping holder and clamping cylinder selection and the design idea of hydraulic system, in order to determine the reliability of this equipment in theory. The practicability of BG mechanical pipe handler is proved by field test.

Abstract:There are many types of platform used in offshore construction with different features. According to the characteristics of engineering, economy, and practice are the basic requirements to choose offshore construction platform. The increasing marine geological engineering projects also cannot do without the support of offshore construction platform. The paper introduces the types and features about the work platform, analyzes the rational use of it and discusses the relationship between engineering project and platform, which could provide a reference for choosing reasonable construction platform.

Abstract:The derrick model was established based on solidworks 2013, and ansys14.5 was introduced to make the finite element analysis on the rated load and model in strong winds. The analysis indicates that all the strength and rigidity of the derrick meet the requirement of safe use under the rated load in 8th-force wind with sufficient weld strength reserve of the key parts. By comparing natural frequency of the derrick and working frequency of the drilling machine, the analysis on the main vibration mode of each modal comes to that the derrick structure of drilling machine is designed reasonably.

Abstract:With the increasing depth of exploration,the size of drilling equipment becomes larger and larger, and the labor intensity of operators also increases. Based on this case, the 3500 hydraulic drilling rig requires a shift pendulum tube device to reduce labor intensity as well as to transport drill fast and safely. In this paper, the racking pipe device has been designed with a determination of the parameters and the mode of the moving parts to guarantee the racking pipe device move smoothly and operate safely and reliably. Meanwhile, ADAMS dynamics simulation software has been used to conduct motion simulation for the device to identify deficiencies in the design, and to give optimization recommendations.

Abstract:The working situation of wire-line core drilling is analyzed and three-dimensional simulation are made on the stress states on wire-line core drilling pipe and connection joint based on ANSYS. Through the numerical simulation, the position of maximum stress on the drilling pipe in different working conditions is presented, which have certain reference value to prevent drilling pipe breaking, optimize the design of connection joint thread and determine reasonable drilling parameters.

Abstract:To deal with the poor self-stability of loose formation and drill tools sticking caused by block-falling and hole shrinkage, new PDH-130 bidirectional rotary-percussion-extruding mole is designed by using the floating core tube to change impact piston stroke and achieve the reverse impact function when normal rotary-percussion-extruding drilling and drill pipe lifting are conducted. On the basis of the field tests, improvement is made on the structure of PDH-130 bidirectional impact mole to meet the construction requirements of rotary-percussion-extruding drilling in sand, gravel and other complex formations.

Abstract:A wharf reconstruction project lies in Monrovia, Republic of Liberia, where the silt and silt clay formations are thick with high compressibility and thixotropic. Considering the factors of stratum conditions, construction equipments, project period and project cost, the bored pile is designed according to the related standard and according to the site conditions and the characteristics of the bored grouting pile, and the construction process is formulated. The quality control measures are put forward for the problems of water oozing from casing, drilling tool sticking and grouting pipe blocking in bored grouting pile construction.

Abstract:Trench cutting re-mixing deep wall (TRD method) is a new construction method introduced from abroad in recent years. In this paper, combining engineering case, TRD method is introduced about its wall construction theory, construction technology, main points of construction and the application scope and the analysis is made on its advantages and disadvantages in practice application. The engineering practice proves that TRD method has obvious technical superiority in retaining and seepage prevention of foundation pit engineering.

Abstract:Because of the special structure, the rotary drilling rig is not suitable for small diameter bored piles. Aiming at this problem, a new technology of rotary holing for small diameter bored pile has been developed, which contains the self-designed XFK600 non-dilated bit, special technological parameters and mud protecting by tube with steel liner. This technology has been widely used in many large projects after successful experimental study. The paper introduces the technical innovation, key technologies and application effects.

Abstract:Using Pareto diagram (Plato method) of statistical methods, the analysis is made on the types of frequent accidents in geological drilling in coal production and influencing factors of the “three violations”. The major accidents in production safety, the causes of hidden danger in safety and the key precautionary measures are pointed out.

Abstract:Shield is the most effective method of city subway construction. As long as the reasonable tunneling parameters are set, synchronous grouting in tunneling becomes one of the key technologies in the process of excavation. With the reasonable grouting parameters, the influence on the surface of surrounding city environment can be effectively reduced. Through the quantitative analysis on the grouting volume and grouting pressure of synchronous grouting, the control level of shield construction parameters is improved; the conclusion can be applied to the shield construction for subway and also can be the reference for other related works.