Abstract:With the further development of economical construction in China, the research on water well drilling rig is also rapidly developing with manufacturing level improving by introducing and digesting advanced equipments and technologies from abroad. The paper discussed the water well drilling rig about the classification, application features and drilling technology, analyzed the development of water well drilling rig in China with some constructive ideas put forward.

Abstract:During the coring of loose and soft formation in the subsea and continental water region, there are many difficulties such as poor quality of core and low core recovery. The hydraulic pressure shear coring tool was designed to solve these problems. The paper introduced its design principles, configuration features and the laboratory test effect.

Abstract:Linear elastic constitutive model was used to analyze the stress distribution in the vertical wellbore; Mohr-Coulomb criterion, Drucker-Prager criterion and Mogi-Coulomb strength criterion were respectively applied to calculate the minimum fluid column pressure required to maintain stable wellbore for the crustal stress measurement and monitoring borehole in Pinggu. By the contractive analysis, because of the intermediate principal stress， the minimum fluid column pressure required to maintain wellbore stable could be reduced. The minimum fluid column pressure derived from three criteria show the consistent variation trend with the depth in corresponding diagraph, which indicates that three criteria have their own applicability: Mohr-Coulomb criterion is conservative, Drucker-Prager criteria is somewhat dangerous and Mogi-Coulomb criterion is superior to the first two.

Abstract:There were difficulties of broken formation, poor cementation, circulation lost and collapsing in Nanping mining area, and several boreholes could not reach the designed depth. By attempts of washing fluid selection, borehole structure simplification and drilling technology improvement, the scrap ZK474 and ZK477 were displaced and reconstructed with success. The paper mainly introduced the wall protection and leakage control measures.

Abstract:The paper discusses the difficulties of hole cleaning before casing for directional deviated well construction in collapse-columns and presents an easy manufacturing method of fishing tool for hole cleaning pipe, which can handle fishing rapidly and effectively with less loss. The difference to common casing and the operation attentions are put forward.

Abstract:The high drillability grade, low penetration rate and long drilling cycle seriously affect the exploration speed in Changling deep fault depression. Analysis was made on the principle of efficient rock-breaking by rotary percussion drilling and the exploration speed improving situation.

Abstract:In view of the great action effect of ultra-short radius horizontal well in inefficient well potential tapping, well trajectory and bottom hole assembly are designed with optimization in well drilling engineering. A set of mature optimized design technology are formed for ultra-short radius horizontal well, which was applied in the construction of ultra-short radius of horizontal well in Daqing oilfield with attended effect.

Abstract:Sidetracking in φ177.8mm case is one of the main development directions for vertical wells in old Tahe oilfield in recent years. Sidetracking in carboniferous kalashayi formation, iron scraps accumulate in the case opening because of large circulating pressure loss and narrow window for upward iron scraps, which bring high pump pressure, tangle cutter and difficult cutter backstroking; formation compactibility makes low penetration rate and blocking; penetrating 2 different pressure systems of carboniferous and ordovician causes lost circulation, large torque and drag. By the optimization of bit, drilling parameter, steerable motor and drilling tool assembly and by the trajectory monitoring and mud technique, sidetracking was successfully completed for old well reconstruction in Tahe oilfield.

Abstract:The cement-sodium silicate slurry is widely used in grouting and water stopping, and the solidification characteristics of slurry have the direct effect on such engineering. The gelation time and fluidity of the slurry with different water/cement ratio have been studied on the theoretical basis of setting and hardening of cement-sodium silicate slurry. Contrast tests have been done to research the influence of admixtures to the solidification characteristics of slurry such as FDN, SM, NF, UNF-5, citric acid, polyphosphate, tartaric acid and disodium hydrogen phosphate. The retarding performance of disodium hydrogen phosphate is specially studied by means of the data of contrast tests, and the influence law of the disodium hydrogen phosphate to the solidification characteristis of cement-sodium silicate slurry has been got. The different formulas of cement-sodium silicate slurry are designed according to the initial setting time.

Abstract:Based on the reviewing of large amount of literature data of China and according to the engineering practice for years, study was made on the concept and the meaning as well as the content of deformation control design of foundation pit.

Abstract:Shougang Jingtan Co. is a large modernization outstanding quality iron and steel base in Caofeidian Island, which was newly built on a ground developed by hydraulic fill sand. Analysis was made on the geological conditions and commonly used methods of foundation pit support and dewatering in construction site; and the suggestions were also put forward to the foundation pit support and dewatering design for the existing buildings in construction site as well as the scheme selection.

Abstract:According to the characteristics of karst development in Zhongliang reservoir, the high pressure cement grouting is adopted mainly with some other grouting technologies combination. The equipment configuration and the process are simple with high efficiency and low cost. The composite grouting treatment technology in Zhongliang reservoir was discussed to provide a new idea for seepage control and plugging of reservoir in karst development area.

Abstract:Larsen steel sheet pile supporting technology was used for a deep foundation pit support of a pipeline network construction in soft soil of Tongling with good effect. Based on the physical-mechanical properties of excavated soil and the pipeline laying requirement, calculation was made on the supporting structures. According to the construction practice, attentions in construction were put forward.

Abstract:Because of high demand on the horizontal displacement and vertical precision in inversion construction of steel pipe column, it is difficult to meet design requirement by general support stud construction method; and the concrete with different marks for pile body and the lining inside of steel pipe in the structure design bring challenge in grouting quality. With an engineering case of Wuhan, the paper introduced inversion construction of steel pipe column in steel pipe column location, verticality control and grouting of different concretes.

Abstract:The paper systematically introduced the calculation method of pulling force in axial direction deviation rectification of boring head and retraction control during boring intermittent in rectangular box culverts jacking-pulling construction with engineering example. Based on the theoretical analysis and relative calculation formula, accurate results can be obtained for jacking-pull construction with rectangular box culverts.

Abstract:According to the low drilling speed and short service life of PDC bit and cone bit in hard and abrasive formation, a low temperature electroplated impregnating pulse petroleum bit was developed, and numerical simulation of flow field of the bit was made. The field application shows that the bit has long service life and high penetration rate.

Abstract:Under some fixed sintering temperatures，the effects on the sintering properties and microstructures of Re(La) content in Fe-based matrix were studied. The optimum mechanical properties of Fe-based matrix were attained at the La content of 0.1%. The distribution of matrix and the retention of diamond in matrix were also improved with proper La addition.

Abstract:The surrounding rock of multi-arch tunnel is intermittence jointed rock masses in most cases; it’s more realistic to analyze the deformation and failure mode characteristics of this kind of rock with discontinuous deformation analysis (DDA) method. The deformation and failure process of surrounding rock of Jinjishan multi-arch tunnel was simulated and the whole failure process was divided into 3 stages: rock deformation, surface subsidence and slip plane appearing above the mid-partition; slip planes (or bands) forming on both sides of tunnel; the rock mass instability above the mid-partition and rapid collapsing of rock mass above the tunnel. The paper studied the deformation and failure characters of shallow and deep surrounding rock in Jinjishan tunnel with the conclusion that the sidewall of the tunnel, the dome or the inside spandrel close to mid-partition and the outside spandrel would be first deformed.

Abstract:Application of cement & fly ash slurry in a tunnel grouting of hydropower station was analyzed, according to the geological conditions of surrounding rock in contract section Ⅳ, tunnel grouting by cement & fly ash slurry was feasible to satisfy the design requirement with lower construction cost.

Abstract:The organization management for large-scale drilling provides technical support to whole exploration. Based on the large-scale drilling construction project, analysis was made on the main problems of organization management; and the experience of solving these problems was summed up with relative countermeasures and proposals.