Advanced Materials Research Vols. 1006-1007

Abstract: Horizontal oil and gas drilling has become one of the most valuable technologies ever introduced in the unconventional drilling especially. Nevertheless, it is complex to calculate the horizontal wells’ true formation thicknesses in the dipping strata. Combined with the actual geological conditions and mathematical methods, a complete set of new formula was derived from the basic data of the strata dips, dip directions and individual layer data to calculate the true formation thicknesses, which could obtain the horizontal wells’ true thicknesses of Penglaiba Formation of Lower Ordovician in the northern Tarim Basin. And the calculation results were accurate. Calculated with this formula, the Penglaiba Formation’s true thickness was given, wells’ relative distributions were located, and the columnar section of Penglaiba Formation was spliced to discover the geological situation subsurface accurately. The columnar section of Penglaiba Formation in the northern Tarim Basin could provide a theoretical basis for reservoir prediction and the distributions in the low permeable beds. This is the key technical method to descript the palaeogeologic map.

Abstract: Based on the analysis of source rock geochemical index, with K₁qn₁ Formation of southern Songliao basin as the research objective layer, it’s concluded that the mean TOC value of shale in K₁qn₁ Formation is higher, generally more than 1%, which belongs to the best source rock. Most of shale organic matter types are type I and type II₁. The thermal evolution degree of organic matter is generally in the mature stage: a stage of large hydrocarbon generation. With logging geochemical method applied, the calculated total resources of shale oil in K₁qn₁ formation are 15.603 billion tons. The II level of resources are 8.765 billion tons, which is more than 50% of the total resources. The I level of resources are 4.808 billion tons while the III level of resources 2.03 billion tons. Overall, the southern Songliao Basin still has a certain degree of prospecting and mining value.

Abstract: In recent years, the development of super-absorbent material was very fast, its ability to absorb water up to several hundred or even thousands times of its own weight, it provides a new way of gas drilling to solve the water carry problem. According to the characteristic of the formation, we optimized polyacrylic acid salt as the water absorbent material, and evaluate salt resistance, temperature resistance and compression resistance. And we discussed the feasibility and recycling of the technology. And we find that this kind of super-absorbent material which can absorb deionized water 1484 times,absorb 0.9% NaCl aqueous solution 687 times,absorb 50% ethanol 705 times, that can meet the water carrying requirements of gas drilling.

Abstract: The field tracer test is dropping quantitative tracer materials in the entrance of ponor upstream and to monitor online concentration of tracer materials in the main export of underground river downstream, and then deduce the type of groundwater pipe and the source of supply according to the concentration. This thesis takes the landslide areas in highways across form Quanzhou to Nanning and in tunnels connecting Ji’an with Zhongjiashan in Lianhua (a town in Pingxiang) as the research object, explores the supply source of tunnel water, meanwhile uses three tracer materials of different nature, namely the fluorescein sodium, fluorescent whitening agent and rhodamine, to place 4 drop points and 3 receiving points within 20 square meters of the surveyed area, to conduct groundwater tracer test. The test shows that there is no obvious connection between tunnel water gushing and F₅ fracture main ditch surface water as well as F₅ tectonic fracture zone; Fault F₂ has good conductivity, and the gushing water in the right hole in the import and export of tunnel is related with F₂ fault tectonic fracture zone.

Abstract: The damage process of coal is often accompanied by electromagnetic radiation. Researches on the characteristics of electromagnetic radiation in the impact damage of coal are significance. Due to the presence of background noise of environment and instrument. The acquisition signals contain noise. So noise reduction is also important. Using split Hopkinson pressure bar (SHPB) and transient ZDKT-1 type magnetic vibration test system, we acquisition electromagnetic radiation signal in the process of impact damage of coal. By using Hilbert huang transform (HHT),we reduced the noise in the original signal. Then we analysed the characteristics of electromagnetic radiation signal after noise reduction. It is demonstrated that: (1) It can get good noise reduction effect for electromagnetic radiation signal by HHT method.(2) The characteristics of signals show that straight line rises in the beginning, index decreases in the middle, and small oscillation occurs in the end.(3) The duration of electromagnetic radiation signal are less than 2 s , and the frequency are 0 ~ 40 Hz. (4) The amplitude of signals increase with impact velocities.

Abstract: The inner flow field of centrifugal pump is complex and presents a characteristic of three-dimensional turbulence. Used Solidworks software to establish a three-dimensional model of the pump and impeller, completed the numerical simulation of centrifugal impeller flow field based on the turbulence model and Fluent software, obtained the static pressure and velocity distribution of flow field, provided basis for the design and optimization of the subsequent product.

Abstract: An application of intelligent pressure detection and alarm system are studied in this paper . it is consists of the high integration, powerful function new microprocessor control, the internal integration of a large number of analog and digital peripheral module. The system has strong data processing ability. multifunctional intelligent hardware is not only realized in circuit necessary configuration,but also is a small size device. it ensure the intelligence function,and has the advantages of small volume, low cost, integration and strong anti-interference ability .

Abstract: This paper analyzes hydraulic system of the bicycle assemply line,Aiming at the problem of the hydraulic system pressure not up to design standard when there is only a hydraulic pupm in the oil supperly system. Put forward to replaced two throttle valves by two check valves. The results show validity of the method.

Abstract: The power bond graph of hydraulic system of power-slipway for combined machine tools was built on the basis of analysis on its hydraulic system and actual working cases. Dynamic model of hydraulic system of power-slipway was built. At the same time, making use of Simulink, dynamic simulation of hydraulic system of power-slipway was carried out. Influence law of primary technology parameters on dynamic characteristics of the hydraulic system of power-slipway was expounded. The simulation results will provide theory basis for performance analysis and optimal design of hydraulic system of power-slipway for combined machine tools.

Abstract: The paper combines CFD simulation and high-speed observation experiments to analyze the forming mechanism of high-speed cavitation flowing inside V-groove. It is found that the formation and development of cavitation are greatly affected by the cavitation nucleus, and subjected to two flow patterns, shear flow and vortex. When the groove is shallow or valve opening is small, cavitation inception occurs in the strong shear region near the throttling edge, which is related to the separation of boundary layer and the wall attachment effect. As the depth of the valve port increases, the reflux becomes stronger at the back of the throttling edge, which complements the low pressure area generated from the fluid separation. At the same time the pulsation is formed in the downstream due to the large longitudinal velocity gradient, resulting in vortex, and the area of ​​low pressure in the center of vortex also leads to the generation of cavitation.