A new type of electrode has been prepared by composite of molybdenum disulfide (MoS2) and graphene oxide (GO), and applied in adsorbing Pb(II) in water using capacitance deionization method. The electrode was characterized by X⁃Ray Diffraction (XRD), Raman, Transmission Electron Microscopy(TEM), and Brunauer⁃Emmett⁃Teller(BET). The adsorption mechanism was investigated using X⁃ray photoelectron spectroscopy (XPS), XRD and cyclic voltammetry (CV). The results indicate that GO in the GO/MoS ₂ composite could prevent aggregation of MoS2 and increase the interface of electrode with electrolyte. Besides, the absorption mechanism is proved to be the synergistic absorption effects of double electrode layer and pseudo⁃capacitance, and the former is more effective. The adsorption capacity of GO/MoS ₂ composite electrode is 4 614.9 mg/g, higher than that of pure GO 1 876.9 mg/g and pure MoS2 1 175.4 mg/g, Therefore, GO/MoS ₂ electrode shows superior performance in removal of Pb(II) with high concentration.

In order to accurately identify the leakage location of multi⁃annulus pressure wellbore in deep gas wells, field tests of leakage detection have been carried out for typical well X1 in X deep gas field in China by using array noise, spectrum noise, electromagnetic defect detection and temperature logging technology and through production tubing logging methods. The results show that there are leakage points in the A, B and C annulus of the well. The formation gas channeling through packers, casing threads and cement sheaths leads to continuous annulus pressure in the well. It can be seen that the combined logging technology can locate the deep gas well leakage point through the 3⁃layer pipe column, and comprehensive information can be used to accurately determine the path and cause of the gas leakage. The casing leakage was detected through the production tubing, so the leak detection results can not only provide an important basis for the treatment of the wells with sustained casing pressure, but also avoid tripping operation, without affecting gas well production, which has certain application prospects.

         There are many chances for natural gas to emit from gas fields or natural gas stations into the air, and the discharged gas not only leads to serious safety hazard and potential environmental issue, but also brings about unregenerate energy resource waste and economic losses. Natural gas recovery technology has not yet been popular for industrial applications, because there are generally some disadvantages for the existing recovery technologies, such as high pressure, high energy consumption, high requirements of equipment condition, nonportable and nondetachable in use. Therefore, a mobile combined adsorption natural gas (ANG) recovery equipment was developed, which was composed of five skids for portability, including gasifier skid, buffer bottle skid, vacuum pump skid, compressor skid and ANG cylinder skid. Then, the design and selection of devices for each skid were conducted, the equipment performance was evaluated, and the field application case was introduced. The equipment can collect the natural gas discharged from the gas fields or the natural gas cylinders or the LNG cylinders into the gasifier and the buffer tank, and then compress and store the natural gas into the ANG cylinder by the compressor, to realize to adsorb and recover the natural gas high efficiently in a medium pressure (~4 MPa) and with a volumetric ratio of the filled gas to ANG cylinder of more than 80. Meanwhile, the field application of the equipment showed that the carbon emissions in the field would be reduced by more than 97%. The equipment has advantages of high efficiency, safety, detachable, portable and mobile, autocontrol and touch screen control.

A viscoelastic surfactant which contained a long chain alkyl quaternary ammonium compound with a kind of alkyl sulfosalt as the thickening agent of clean fracturing fluid was selected. Then this surface active agent was used as main agent, clay stabilizer and others additives were added. The formulation of new clean fracturing fluid was obtained through single factor analysis and orthogonal test method. The temperature resistance, shear resistance, sandsuspend, gel breaking and viscoelastic performance were analyzed in the laboratory. The results showed that the clean fracturing fluid system had good temperature stability, strong shear resistance, good sandsuspend performance, and the residue and viscosity of the system after gel breaking were at a low level, which can be easy prepared.

The formation mineral composition, micro structure and physicalchemical properties of representative shale samples of deep complex shale formation in Yuguo area of Tuha oilfield were analyzed by Xray diffraction, Scanning Electron Microscope, swelling and dispersion tests, specific surface area capacity measurement, specific water capacity and other experimental methods the mechanisms of wellbore instability in deep complex formation were made clear. A three cooperation principle for stabilizing wellbore by improving the performance of drilling fluid was put forward. This method includes the technologies of sealing and consolidating side wellbore physicchemically, enhancing inhibition against hydration and providing the effective stress support of reasonable drilling fluid density. The responding antisloughing drilling fluid which is suitable to deep complex formation in Yuguo area was developed by selecting all kinds of additives and optimized formulation. The site trial indicates that this drilling fluid has great capacity to antisloughing and sealing layer. The drilling fluid is easy to manage and maintain. Using this drilling fluid can improve drilling velocity and save drilling cost.

The oxidized wax was prepared by catalytic oxidized reaction of paraffin wax which used BP neural network to build mathematical model of acid value and saponification value influenced by the amount of reactive catalyst and accessory ingredient, airflow rate, reaction temperature and time, and utilized the model of neutral network to calculate the technology condition of preparing oxidized wax through catalyzing and oxidizing paraffin wax. Consequently, optimum technology conditions were gained in order to achieve the objective of reducing experimental number of times. 

The method aims to use the FEM software system CFD to study the efficiency of helical strakes to suppress vortex-induced vibration(VIV).In the calculation analysis,bare riser and two riser models with different heigh to fhelical strakes configurations have been simulated. With the current speed varied,for the bare riser and for two different strake configurations,the results show that the drag and lift changes with Re and have been compared to Morsion and the related tests,for the study of Helical strakes how to suppressing theVIV.Flow visualization provides insights on how helical strakes mitigate VIV.

The paraffin wrapt to microcapsule with urea-formaldehyde resin to resolve the compatibility issues for phase change materials was studied. The parameters affecting the coating process were investigated, including emulsifier kind, emulsifier dosage and the mechanical rotation speed. The morphology of the microcapsules varying with the acidification time was observed．Experimental results show that，when the complex emu1sifier is composed of 71% octadecanoic acid and 29% triethanolamine, the microcapsules made from 7% complex emulsifier at the rotation speed of 1 000 r/min and the acidification time for microcapsule synthesis is 90 min are of uniform particle size, smooth and wellsealed, and an average partic1e size of 29.8 μm.

Two tests were designed to investigate activated carbon adsorbing gasoline vapor. In the inlet vapor-air mixture of the adsorption towers, the vapor volume fractions were 0.05 and 0.40, and the mixture flow were 40 m3/h and 65 m3/h respectively. The test results show that their recovery rate are above 95%, but test I appeared lower heat effect in carbon bed than test II, because the temperature increase in their beds were 43.1 ℃ and 72.2 ℃ respectively. A new integrated technology of absorption-adsorption for gasoline vapor recovery was developed. The recovery rate is up to 99.6%, and the outlet vapor volume fraction can be controlled below 0.003 2. Heat effect in the new carbon bed is the lowest, because the temperature increase in the bed is below 35 ℃. The integrated system will repay lower investment than the single absorption and higher safety than the single adsorption. The integrated system will appear distinct comprehensive benefit. 