Abstract:The expandable casing technology using in geo-engineering drilling is being studied. This paper introduces study status of the expandable casing technology and the type of expandable casing. This study determines selection principles of the expandable casing material and the expansion tool shape, analyzes the expansion mechanism of expandable casing and establishes the construction process. Wall protection technology by expandable casing can be applied in geo-engineering drilling in China and increase the means of wall protection technology of geo-drilling.

Abstract:The horizontal well H024U is used to connect the first and the second target-vertical well V024 and V024U. The advanced construction technology of brine mining connection well and the magnetic measurement guiding system with high technology content & independent intellectual property right manufactured by the Institute of Exploration Techniques (achievement of geological investigation project) were adopted in the construction. Based on the construction experience of horizontal wells in Turkey, the drilling parameters were carefully designed and controlled, accurate target hitting was realized with hitting the production casing bottom of V024U to realize the accurate well connection.

Abstract:According to the study on the drilling with casing technology in complex stratum, analysis was made on the force condition of casing drilling tools and FEM analysis was made on the vulnerable parts. Improvements were put forward for the problems in drilling practice and optimization design of casing thread structure.

Abstract:Micro-foamed drilling fluid has the ability to control lost circulation, which is more applicable for wire-line coring drilling in mineral exploration where micro-crack lost happens frequently with the advantages of good lubrication, high capacity of cutting transportation and core protection etc. but without necessity of special equipment. Micro-bubble drilling fluid is conducive to improve the efficiency of wire-line coring drilling and reducing accidents; therefore, this technology has good prospects and great potential for wire-line core drilling.

Abstract:With the deep drilling project of M24 mining area in Chengde, analysis was made on the application effect of selection of drilling parameters. In deep hole drilling, drilling pressure should be selected by considering the drilling diameter; hardness, strength, abrasiveness, integrity of rock. Within a certain range, the ROP of diamond bit is proportional to the rotary speed; the selection of flushing fluid should be based on the bit type and size, matrix properties, drilling depth, rock abrasiveness and integrity; the appropriate enlargement of the outside diameter of diamond bit can effectively avoid the hazards of high pressure pump; down-hole drill rod conditions can be determined by observing the changing value of current in current instruction sheet of main motor. Current changes reflect the changes of rotary torque of the drill.

Abstract:With the great water inflow and high pressure of confined water in ZK311 borehole in a phosphate mine in Guizhou, the inner tube for wire-line coring could not be put down. According to the serious block falling, phosphate erosion, uncertain core collecting rate, quick drilling pipe joint wearing and frequent drilling pipe breaking accident, drilling bit was modified and construction technology was innovated with good drilling and geological results. The paper introduced the drilling technology and the construction measures in this project.

Abstract:The quaternary strata is loose and easily collapsing, normally casing set is necessary in the soil drilling, and casing accident is very difficult to dill with. This article accumulates experience in incident handing techniques in similar soil through the summary of the treatment process and provides the treatment measures for casing incident.

Abstract:Coal seam often disappears or thinner than expected in coalfield drilling construction; therefore, the sampling experiment and the evaluation on minefield would be uncertain. In this case, the supplementary coal coring by slant drilling is necessary for accurately realizing the position and the thickness of coal seam with complete coal sample. Diamond wire-line coring drilling technology was adopted in the drilling construction in Dacun coalmine section of Guxu mining area of South Sichuan coalfield, the technology of supplementary coal coring with eccentric wedge was studied and mastered.

Abstract:By the analysis on the mechanism of improving penetration rate by the structure of pulsed cavitation jet generator and based on the field application, the paper introduced market prospect of oil industrial both in China and abroad and put forward the solution of improving penetration rate for well drilling.

Abstract:The well Niure 4 is located in Niutuo Town, Gu’an County of Hebei Province. The well drilling construction was carried in the Eugene and drilled to the gypsum mudstone stratum with the thickness of 300m. Through strengthening management of drilling fluid quality, the drilling fluid performance was adjusted by ferric chromic salt, CMC, sulfonated asphalt, polyacrylic acid potassium and alkali; water-swellable collapsing in mudstone stratum was successfully resolved.

Abstract:The rocks in Mo-Au ore section of Nanping mining area are broken into blocks and clastic rocks of different sizes by geological stress with joint fissure development, loose cementing; in this case, the collapsing is easy to cause knock-on effect and would be out of control. Big particle cuttings containing breccia would block borehole with washing fluid in uphole circulation. Study was made on the selection of washing fluid and drilling technology, by the practice of borehole control on ZK557 and ZK477, effective methods to treat such formation were successfully found out.

Abstract:Clay invasion is the phenomenon that formation clay invades drilling fluid, leading to performance deterioration of it. As long as drilling in the sedimentary strata (usually sandstone, mudstone, shale and limestone), there is more or less drilling fluid invasion problems caused by clay, which result is drilling fluid performance deterioration. The stratum mud making solved the clay invasion problem and varied harm into use. The key problem is what kind of formation can be used to make mud. Currently there are involuntary uses of stratum mud making in various places in China, while little specific study on mud making is made. The paper discussed the study on stratum mud making with the case of ZK012 census hole in the rock salt potash mine district of Suxiang, Mingguang.

Abstract:Rock salt is a versatile basic chemical raw material. Ordos Basin is not only rich in oil and gas resources, and Ordovician stratum in the east edge of the rock salt is one of the main salt basins also rich in resources. With the development of drilling technology, deep and ultra-deep drilling is more and more in complex formations; the higher demand of drilling fluid performance is increased. The paper introduced the case of well S/D-2: complex salt gypsum formation was encountered when drilling to the depth of 2480m, sticking happened with the enlargement of well diameter caused by salt dissolution and crystallization by salting out. According to these problems, drilling fluid system of polysulfonate under saturated brine was applied, borehole instability in salt gypsum formation, drilling fluid contamination and other technical issues were solved.

Abstract:In core drilling, drillers are often obsessed with when advance flushing fluid should be supplied in fully lost boreholes. Two methods about how to determine the supply time are put forward and compared with each other for drilling of lost boreholes.

Abstract:Analysis was made on the shortcomings of current drilling rig both in China and abroad, and according to the development direction of geological prospecting in China, HQY-500 full-hydraulic drilling machine was developed. The paper also introduced the drill in structure form, technical parameter, characteristic and production test in field.

Abstract:The paper introduced the drilling rig for 3000 m deep well about the design of dynamic parallel connection and the analysis calculation of heat balance. Based on the calculation result, exposition forced cooling scheme and specific application methods were determined; and according to the engineering case and formula calculation, the calculation program of heat balance of dynamic parallel connection was designed.

Abstract:The paper introduced the theoretical calculation of compression modulus of composite foundation of cement-soil mixed pile with an engineering case. The actual value of compression modulus of composite foundation of cement-soil mixed pile was derived by the observation data of actual settlement, and comparison was made to the compression modulus of natural ground. The concept of correction coefficient was put forward to calculation formula of compression modulus of composite foundation of cement-soil mixed pile.

Abstract:Being an advanced construction technology, the high-pressure swing cut-off wall is extensively applied in many kinds of anti-seepage project in China. General construction technology is divided into order Ⅰ and Ⅱ. The high-pressure technology with non-order method used in the project is not only good for piles overlapping and speeding up the construction schedule, but also good for control of cutting-off wall thickness to build up the foundation for the promotion and application of high-pressure cut-off wall.

Abstract:The combined support is usually used in the region of Dalian due to its complex ground structure. In one project, calculations, support designs and observations of the construction results have been carried out for foundation pit stability under different conditions, and it is proved that the combination of the hand-dug pile with the stiffness pile, the anchor cable with anchor bolt, and the woven net with sprayed concrete， provides better support for the foundation pit in complex ground, and also a successful field case in support of deep foundation in Dalian.

Abstract:In complex geological conditions, the rational cofferdam by selection according to the field geological conditions becomes the key technology of retaining and water stoppage in deep excavation. With the construction case of 22 pylon pier of Shuangyong bridge of Liuzhou, the paper introduced cofferdam construction technology with combined cofferdam by interlocking steel tube pile and reinforced concrete retaining pile in complex geological conditions.

Abstract:It is a difficult technical problem for drilling in deep overburden layer with light rig and collecting core in the western mountains. Pore-formation became more difficult with collapsing and drill burying in deeper drilling. By the reasonable design and improvement on mud protection, the borehole reached the depth. The application results show that the drilling hole design was divided into 4-stages variable diameter, drilling with bits of different materials; SM-KHm ultra-low solid-phase slurry-supported was adopted in the alluvial medium-fine sand layer and diluvia gravel soil layer for borehole stability; the maximum drilling depth reached 22354m with more than 95% collecting rate of drill core.

Abstract:Based on the successful experience of the application of combined seepage draining technology with horizontal drainage hole, gravel pile and blind ditch in a tailings reservoir of Xiangshan pyrite mine, the paper introduced the construction process of horizontal drainage hole in tailings reservoir and the application prospect of this technology.

Abstract:It is cumbersome to calculate the metal powder of hot pressing diamond bit. According to the bit using effect, matrix formula will be revised timely. Based on the VB development, calculation software of metal powder was designed for hot pressing impregnated diamond bit. Only by inputting the bit parameters and the matrix formula, the weight of metal powder and diamond for matrix can be conveniently calculated, and the calculation results can be archived and printed to realize the scientific management on the bit production.

Abstract:The excavation simulation and fully-coupled model of the fractured rock in the discrete element method are used to analyze the changes in fracture aperture and in the seepage flow process after excavation. The flowing discharge after tunnel excavation is used to represent the permeability of the fractured rock mass in the article, in order to investigate the coupling effect on the permeability characteristics of the fractured rock mass. The effect on flowing discharge in the excavated cavity or tunnel by block boundary size, initial in-situ stress ratio, the fracture aperture and the included angle were studied based on the numerical test. It is found that with the increase of block size and the in-situ stress ratio, the flowing discharge in the excavated tunnel becomes decreasing; and with the increase of initial hydraulic aperture, the flowing discharge increases coincidently and keeps invariant with a fixed amount. The flowing discharge reaches the maximum value when the included angle between the two joint sets is 75.