Abstract:This article introduces casing drilling, a new drilling technology in petroleum drilling field, referring to its characteristics, advantages, development history and current status of its research and application. The possible advantages and application prospects of casing drilling in geological exploration drilling are analyzed and proposals on the research and development of casing drilling technology for geological exploration have been put forward.

Abstract:This article further discusses the rock breaking mechanism and proposes using the low process plan for rotary drilling in the hard compact weak-abrasive rock layer. Good effect was obtained in the practical application, especially in the deep hole without enough RPM.

Abstract:According to the loose stratum, easy collapsing, block-falling and hole diameter shrinkage in the tertiary coalfield exploration for Baoshan-Zhenxin coalfield, application of general double-tube and wireline coring drilling have their own advantages and disadvantages. But by enlarging SA75 wire-line coring drilling tool and hole reamer to 80mm in diameter with corresponding measures of drilling and coring, high quality, high efficiency and preferable benefit were achieved.

Abstract:Geothermal well in Tianjin used to be constructed by traditional three-cone bit. With the development of drilling technology in recent years, PDC bit was adopted in some well sections to improve the drilling efficiency and mud making in mudstone formation was well controlled with steady performance of drilling fluid and lowered maintenance cost. PDC bit has long service life, which can improve drilling efficiency with obvious economical benefit.

Abstract:Based on the real drilling data of the bits used in Hailaer oilfield in 2007 and 2008 and according to the formation characteristics and drilling technology, analysis on the bit selection for different layer section and the causes of affecting penetration rate were made, a series of bits fitting to drilling in Hailaer oilfield was selected out. Field test showed that the penetration rate increased 20% and 30% compared with that of 2007 and 2008, footage increased 21.13% and 17.49% and obvious application effect was obtained in Xi47-44 well and Xi44-45 well.

Abstract:The paper introduced the wall protection and leaking stoppage technical measures while drilling in Qaganqulu Mining Area of Keerqiyouyizhong Banner. According to the rock strata condition and the hole depth, wall protection and leaking stoppage by casing, drilling fluid and cementing were adopted with good effect and movable casing was safe and reliable for special rock formations. The tight mud cake formed with low solid-phase mud of sodium carboxymethyl cellulose (CMC) + hydrolyzed polyacrylamide (PHP) could stop block falling. Water cement ratio and inert materials amount were rationally regulated for hole sealing by grouting cement slurry inside the drill pipe to ensure the sealing efficiency and quality. The above various wall protection technologies show obvious effects, they can be widely popularized.

Abstract:It was showed by the example calculation of non-soil phase drilling fluid in Daniudi gas field that the correlation coefficient of Herschel-Bulkley model was the largest with the smallest residual sum of squares; than was the Casson and power-law model; Bingham model was the worst. Herschel-Bulkley model was suggested.

Abstract:Water-base clay free low solid drilling fluid was applied in Zhenjing oilfield to shorten drilling period, improve operation efficiency, shorten the soakage time of the reservoir with drilling fluid and reduce the reservoir damage caused by drilling fluid. It was proved by practice that the drilling fluid could effectively control the complicated situations in downhole with increased drilling speed and lowered drilling cost.

Abstract:By the analysis on the plugging accident in a deep geothermal well caused by gravel-filling or waterstopping mud ball and cementing pebble throwing, positive impact and reverse suction technology were put forward. The paper introduced the equipment and treatment technology for this kind of accident.

Abstract:Self-designed new pulling tool was designed and applied in pulling filtrating tube process with low cost, easy processing, safe and convenient operation, and with good effect.

Abstract:The paper introduces the principle of medium-frequency induction heating in geological drilling pipe with whole heat treatment, and analyzed the advantages of medium-frequency induction heating technology. The analysis shows that comparing to ordinary heat treatment technology, the drilling pipe treated by medium-frequency induction heating has fine metal microstructure of grain, good mechanical properties, even drilling performance, less surface oxidization, good appearance quality, high anti-fatigue performance and low production cost.

Abstract:By the analysis and comparison of self-designed and developed SQY-1 fixed-depth sampler for hydrological well about the performance characteristics and applicability, the paper discussed its working principle and operation method. The fixed-depth sampler effectively solves the difficulties of water sample collection in the wells in composite aquifer with large water quality variation, accurately reflects the aquifer water quality in different buried depth of strata and is used in hydrogeology survey as a new practical sampling tool.

Abstract:The paper introduces a new uplift pile, part-bonding pre-stress uplift pile. It effectively improves the pile shaft structure; can make full use of the bearing capacity, remodel the mechanical characteristic of the stretched concrete and overcome the cracks of the normal uplift pile. Optimal design was made on the uplift pile by combining the research on underground structure buoyancy with the on-site test on part-bonding pre-stress.

Abstract:With an engineering case of deep foundation pit support of high building, the paper introduced the actual application of diaphragm wall construction technology in deep foundation pit support, discussed the technological process and technical points, put forward the construction attentions and prevention treatment for special problems.

Abstract:With the engineering case, this paper introduced static pressure pile construction about the stress situation, construction points and compaction deformation mechanism; analyzed the construction influence to the engineering itself and neighboring environment; and put forward the construction proposals and preventive measures.

Abstract:With the engineering case of foundation pit support in Anshan International Pearl Building, the paper introduced the application of geological drill pipe in foundation pit support, the successful experience of Leading software calculation with geological drill pipe in place of cable, emergency treatment in foundation pit wintering period and the crown beam function in deep excavation support for the similar projects in future.

Abstract:There is serious weathering of the rock surrounding a garbage disposal plant in Rizhao City. In order to reduce the impact of leachate caused by weathered cracks on the downstream environment, sleeve-valve-pipe grouting method is used for vertical anti-seepage. This article describes the construction method and quality control points of sleeve-valve-pipe grouting technology and summarizes the easy encountered problems in construction with treatment measures.

Abstract:Based on the engineering of vertical shaft of Zunhua iron mine in Hebei, which was 5.6 m in diameter and 286 m in depth, the paper introduced technological principles of vertical shaft constructed by drilling method and prefabricated shaft wall installed by floating installation technology, together with measuring method for the adjacent two shaft walls connection, process control and vertical measuring technology of the shaft after its wall installation.

Abstract:Combined with an engineering example of Shanghai rail transit line 2, the paper introduces a new jackingpulling technology for underground box culvert, which has advantages of convenient working in narrow area and light environmental impact with high guiding accuracy. This technology is an innovation and supplement to modern pipe jacking construction and a new technical means to underground box culvert construction by trenchless technology and provides solution to development and utilization of underground space in complex environment.

Abstract:There are many risk factors and uncertainties in the slope pre-stressed anchor engineering construction in a contract section of Zangmu hydropower station， so the project management is very difficult. The risk assessment index system was established, index weight analysis was conducted by using three-demarcation method and AHP， fuzzy comprehensive evaluation model was introduced, the managers and experts’ experience was changed from qualitative to quantitative, and quantitative assessment of the project risk was made with the result of “high risk”. All of the above offered the basis for further project management scheme establishing.

Abstract:Based on the engineering case of sliding treatment with gravity anti-sliding retaining wall reinforced by vertical pre-stressed anchor, the paper described the vertical pre-stressed anchor, anti-sliding retaining wall structure and the construction technological process. Application prospect of this new structure was shown in sliding treatment in bedrock mountain area.

Abstract:Sonic drilling technology has made considerable progress through improving and developing in several decades and is widely applied abroad. Analysis was made on the structure principle of 3 types of vibrator used for sonic drilling abroad to speed up the reseach progress of sonic drilling in China.