In situ leaching (ISL) uranium mining technology is an in situ mining technology in which the chemical solution is injected into the ore-bearing strata through drilling wells, and the solution moves along the ore bed by controlling the hydraulic gradient of the flow field and reacts with the ore to form uranium-bearing solution. To reduce leaching dead angle in the process of leaching, each pumping and injection unit should achieve uniform leaching at the end of production, and appropriate pumping and injection mode should be adopted for pumping and injection wells of each unit in the mining area. In this paper, on the basis of the actual production data of a sandstone uranium mine, we established the unit flow model of ISL uranium mining area by using GMS software. The unit flow balance of 72 boreholes in the whole mining area was analyzed and optimized through the model. The concept of flow microbalance of pumping and injection unit in the mining area is put forward for the first time, and the calculation equation of supply and receive the flow of pumping and injection well is determined. The calculation and analysis process of flow microbalance of pumping and injection unit in mining area is established. The simulation results showed that the application effect of the model was good, and the correlation coefficient of the solute transport model reached 0.8.

The inline gas-liquid cyclone separator has been gradually used in oil & gas industry due to its high separation efficiency and less footprint. However, under the inlet flow conditions with large range of gas volume fractions, the research on structure design and separation performance are seriously insufficient. The preliminary structural design of the inline gas-liquid separator was carried out according to the particle separation theory, and the key structural parameters were optimized by using the Response Surface Method (RSM) together with Computational Fluid Dynamics (CFD). The structure optimization has improved the degassing efficiency by 17.44% and dehydration efficiency by 7.59%. With air and water as working medium, the separation performance of the inline gas-liquid cyclone separator was experimentally investigated in laboratory under a large range of gas volume fractions. The results show that the separation efficiency for both degassing and dehydration can exceed 80% with the inlet gas volume fraction ranges from 0.2 to 0.8. The optimum normalized flow split and liquid volume flow rate are 0.9 –1.2 and 8 m³/h, respectively.

In this paper, true stress–strain curves of two natural gas pipeline steels, API-5L X65 and X90, were studied using the three-dimensional digital image correlation (3D-DIC) technique. During the test, the steels were continuously strained hardening up to the fracture, and true stress–strain curves were obtained. It was found that the true stress increases with strain after necking, which is notably different from the results obtained by the conventional method. Using the FEM model, the true stress–strain curves were validated. Based on the material’s inherent properties, the material property analysis was implemented. The moduli of elasticity in the elastic region obtained by the proposed method and conventional methods were nearly equal. It was also found that the strain-hardening capacities of gas pipeline steels could be better characterized by the hardening exponent than yield-tensile ratio. Besides, the strain-energy density analysis based on the true stress–strain curve demonstrated that before the onset of necking, only 7.3% of the strain energy density of API-5L X90 was used.