Abstract:Based on the summery of previous drilling experience, analysis was made on the factors which influence ROP in deep well drilling in Yuanba Block from the aspects of geologic factors, complex drilling conditions, rock drillability, formation temperature, mud density and casing program. There are 2 main affecting factors: one is the limit of wellbore configuration stratification, which can not effectively seal the formations with different pressure system; another is that the gas drilling can not be used because of bad formation drillability with a deep and long drilling section. Gas drilling, bit selection and dynamic drilling tool coordinating with high efficiency bit scheme are presented for Xujiahe formation drilling and casing program with particular well size are introduced to give technical support for deep well drilling in Yuanba Block.

Abstract:Based on the knowledge for deep reservoir physical property in Songnan and the potential damage pattern & degree with conventional drilling technology, analysis was made on action principles of protection technologies of well drilling and completion in each stage and the corresponding reservoir protection schemes were made. Research practices show that the technology requirement of reservoir protection are satisfied in well drilling and completion through the pressure sealing with temporary shielding plugging by underbalanced drilling and the improvement on the property of filtrate invaded reservoir with high quality noninvasive drilling fluid and completion fluid system.

Abstract:The solution for design model of soft landing in borehole trajectory can come down to the solution with 7-element nonlinear equations. The algorithm convergence of known numerical iterative algorithm has not been proved, and the convergence of this iterative algorithm severely depends on initial iteration value from the user. 7-element nonlinear equations are simplified to be onevariable polynomial equation by element elimination and simplification; and based on which, a new algorithm for design model of soft landing was developed. Theoretical analysis and practical calculation examples show that the new algorithm is mainly for the calculation of nonnegative real roots of polynomial equation, and calculation of functional relationship between other unknown number and real root is very less. The new algorithm overcomes the dependence on the initial value and probable iterative process divergence, and can get the solutions at the same time when there are several design model solutions.

Abstract:Well Gulong1 is the deepest natural gas exploration well of Daqing oil field in 2008, air/mist drilling practice was made in the Ф311.2 mm third spud section. According to the existing problems, analysis on the application was made for air drilling with different mediums and proper drilling method was optimally selected. The practice showed that the record was made with the deepest well depth and the highest temperature for air drilling in Ф311.2 mm well section in Daqing oil field Song-Liao basin, the air/mist drilling reached to 1196.05 m with average penetration rate of 7.9 m/h, and the maximum drilling footage was up to 552.86 m.

Abstract:Azimuth error and borehole top angle oversize were the difficult problems in drilling construction in Heishan mining area of Chengde. LZ-73（89）whipstock was used for deviation correction with good effect. Based on the analysis on the causes of borehole running deviation and summary on the construction experience, technical measures of borehole deviation prevention were put forward.

Abstract:According to the complex formation in a mining section of Wuyang iron mine, the paper introduced the drilling and leakage stoppage construction technology in slag formation.

Abstract:The paper briefly outlined the importance of wall protection and seepage control by grouting in deep hole coring drilling in broken formation, introduced the grouting parameter selection, cement slurry ratio, accelerator amount control, some technical links and attentions with grouting construction experience summary and the effect evaluation.

Abstract:In order to solve the technical difficulties of complex formation drilling for coal exploration in Xuyong dam of Sichuan, analysis was made on the encountered complex formations. The paper introduced the formation characteristics, borehole construction, washing fluid, wall protection & leakage control and the application of new technology.

Abstract:Traditional clay ball, cement ball, rapid hardening cement and lost circulation additive with sawdust were ineffective for drilling construction in a mine of shanxi, while polyacrylamide and cutting grease brought high efficiency with good sealing effect and low cost, which could reduce the drilling tool wearing, precipitate the drilling waste and purify the washing fluid. The paper briefly introduced the sealing method and the application result.

Abstract:Coal seam is often lost in coalmine coring drilling, and supplementary coal coring is necessary to satisfy the geological design requirement and related geological specification. In the exploration drilling construction of Zhangde coalmine in Henan, the technology of supplementary coal coring in the deep hole was probed and developed, inclined hole was made with eccentric wedge to finish supplementary coal coring in the borehole of more than 1000m.

Abstract:The well completion technologies were formed by the long-term practice in the central Shaanxi area. The paper introduced the traditional methods of deep geothermal well completion technology in this area with the proposal on modification.

Abstract:Pneumatic DTH drilling technology has been widely applied because of its high drilling efficiency and good borehole quality, but there are still some problems such as mismatch between equipment performance and construction conditions, unfitting to the main parameters and notenough mastering of operation rules. Based on the engineering practice and according to the related literature, the paper discussed the technical issues in DTH drilling.

Abstract:Based on the calculation of resistance moment in continuous auger drilling, resistance moment values of different borehole diameter and depth were obtained. The comparison was made on the drilling tool intensity, and continuous auger drilling tool parameters of different borehole diameter were presented. The paper also introduced the different continuous auger drilling bit with different structures and accessory tools, briefly discussed the construction technology of continuous auger drilling with multi-function drill.

Abstract:This paper introduces a no-cable borehole inclinometer based on PDA and bluetooth, which uses triaxial semiconductor magnetometer and two-axis accelerometer sensor as the measuring element and is suitable for non-magnetic interference borehole. Automatic storage approach is used for measurement data acquisition without cable logging configuration； taking PDA as the core， a measurement software based on Windows Mobile 6.0 is developed; wireless communication between inclinometer and PDA is realized by bluetooth instead of the data cable. The instrument has advantages of high precision， good reliability， light weight， less supporting equipment and easy operation, can greatly reduce the field work intensity with higher efficiency and significantly reduce the configuration costs.

Abstract:Power transmission of full hydraulic drill is a key component in transmission, its performance and controllability directly affect the product capability. In the design, the mature synchronizer structure of automotive transmission and remote control principle are applied to drill power transmission, the product performance and controllability were greatly enhanced.

Abstract:The paper introduced the technical principle and process flow, analyzed the technical characteristics of the bored interlocking pile; by the analysis on foundation pit protection interlocking pile construction of Donghanmen rivercrossing tunnel, the key technology was put forward. The advantages in application of bored interlocking pile for foundation pit engineering were summed up.

Abstract:In Shanghai, a great depth and large scale excavation engineering of complex environment and high deformation requirement was constructed with water insulation by cementsoil mixing pile + twofloor support, hierarchical partition, excavating in limited interval and information construction, the engineering was carried smoothly with satisfactory project results.

Abstract:The paper introduced a deep excavation engineering. According to the specific groundwater storage, waterstop curtain at specific depth between piles was applied to shorten construction period and reduce the engineering cost.

Abstract:The paper introduced the comprehensive application of several technology means in foundation pit underground water control with an engineering case, the local underground water control with water-sealing curtain in deep sand formation would be the reference to the similar engineering.

Abstract:High technical standard, large construction quantities, strict requirements on civilized construction and large construction disturbances were the characteristics of Beijing-Shanghai high-speed railway engineering. The paper summed up the pile foundation construction technology in the 3-contract section and discussed the key steps for quality control on cast-in-place pile.

Abstract:The paper introduced the design of pre-stressed anchor cable reinforcement for K444+710～822 upline side slope of Guilin-Liuzhou highway. The design scheme demonstration was made on the basis of the analysis on landform and lithology, geological structure characteristics, climate and hydrogeology conditions and formation mechanism of slop deformation destruction, the best reinforcement plan was presented. It has been proved in several raining seasons that the plan was feasible.

Abstract:By the analysis on the shield construction method and machinery allocation for Minzhi to Wuhe tunnel interval of Shenzhen metro No.5 Line, subway tunnel shield supporting equipment selection for subway tunnel shield interval rapid construction was summed up to accumulate experience the similar project.