To solve the problem of low oil production ability of some wells caused by the imbalance of pressure in the water,polymer and ASP flooding of different regions of the same development zone in high water cut block X of Daqing oilfield in the high water cut,statistical calculation, theoretical analysis combined with reservoir numerical modeling are applied. It is concluded that the mutual interference of pressure in the high and low pressure areas of the reservoir plane is mainly caused by the difference in the pressurization effect of different oil displacement reservoirs,and the well number of the high and low pressure areas that need to be adjusted is determined.After that,through increasing the injection rate of water wells in the low⁃pressure area of the reservoir,fracturing the water wells of high⁃pressure and low⁃permeability reservoir block, and rising the production rate of the oil wells of high⁃pressure, medium⁃high⁃permeability regions, the imbalance of reservoir plane pressure is adjusted,and the mutual interference between high⁃pressure and low⁃pressure wells is alleviated.After adjusting the block pressure, the daily increase rate of oil wells in the same drive layer is above 2.5 t,and a good development adjustment effect is obtained.

In recent years, the development of photocatalytic desulfurization catalyst has been a hot topic in the field of clean fuel production. The preparation method, structure, properties and catalytic desulfurization performance of pure phase, doped, supported and heterojunction photocatalytic oxidation desulfurization catalysts were studied. Due to the narrow light response range of pure phase catalysts, doped, loaded and heterogeneous junction catalysts have the expanded light wave region by reducing the bandgap width of catalysts. It is pointed out that the supported catalyst can not only expand the range of light wave range, but also increase the specific surface area of the catalyst and then further improve the activity of it. However, the study of low cost carriers and the regeneration performance of photocatalytic oxidation desulfurization catalysts are important research directions in the future.

The loop pipe apparatus are used to simulate the different conditions of the actual pipeline and denoise the original signal by the wavelet method. Kernel⁃based Principal Component Analysis (KPCA) is used to extract the time⁃frequency domain eigenvalues of the leaked signals, and the final input vector of the neural network is obtained. Because the traditional BP neural network is easy to fall into local minimum when it is used to identify working conditions, the BP neural network is optimized by genetic algorithm (GA) and particle swarm optimization (PSO). Compared with the traditional BP neural network,the result show that the two optimized BP neural networks have stronger ability to identify leakage working conditions. Finally, from the two aspects of test accuracy and training time, two different optimization algorithms are compared and their different application situations are proposed.

The carrier of hierarchical porous TiO ₂⁃Al ₂O ₃ and the catalyst Ni ₂P/TiO ₂⁃Al ₂O ₃ were prepared. The catalytic performance of the Ni ₂P/TiO ₂⁃Al ₂O ₃ was compared with the N _i2P loaded on the mesoporous Al ₂O ₃  and γ⁃Al ₂O ₃. The influence of the technological conditions, including reaction temperature, hydrogen oil ratio, mass space velocity and reaction pressure, were investigated by Orthogonal test and single factor exploration, respectively. The optimized technological conditions were obtained. The results showed that the hydrogenation catalyst Ni ₂P/TiO ₂⁃Al ₂O ₃ possessed more excellent de⁃aromatic rate and the selectivity of decahydronaphthalene compared with the ordinary catalyst of Ni ₂P/γ⁃Al ₂O ₃ and Ni ₂P/Al ₂O ₃. For the de⁃aromatic rate and the selectivity of decahydronaphthalene, the reaction pressure and temperature had more significantly affection to the hydrogen / oil ratio and the mass space velocity. According to the results of orthogonal test, the optimum reaction conditions of the hierarchical porous Ni ₂P/TiO ₂⁃Al ₂O ₃ catalyst in the hydrodeaphthalene reaction were investigated. The reaction temperature was 300 ℃, the reaction pressure was 4 MPa, the hydrogen / oil ratio was 500, and the mass space velocity was 1 h-1. The removal rate of naphthalene and the selectivity of decahydronaphthalene reached the highest, which were 99.2% and 72.0%, respectively.

Three different methods (ultrasonic dispersion, hydrothermal method and calcination) were used to prepared g-C ₃N ₄/WO ₃  heterojunctions. Obtained catalysts were characterized with X-ray diffraction (XRD), UVvis spectroscopy, nitrogen adsorption, X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and Electrochemical impedance spectroscopy (EIS). The results showed that the interaction between g-C ₃N ₄/WO ₃  and WO ₃ was obviously affected by the preparation methods, resulting in the significant difference in separation rate of photogenerated electrons and holes. The photocatalytic performances were detected in photocatalytic Rhodamine B (RhB) degradation under simulated visible light. The results indicated that activities of g-C ₃N ₄/WO ₃  heterojunction composites were evidently higher than that of single g-C ₃N ₄/WO ₃  or WO ₃ semiconductor, and the heterojunction semiconductor prepared by the hydrothermal method showed the highest photocatalytic activity.

In order to improve the monitoring efficiency and reliability of oil and gas pipeline, the monitoring method of petroleum pipeline temperature based on singleended Brillouin optical time domain analysis has been proposed. The temperature experiment at oil and gas pipelines leakage location has been taken. The experiment results show that distributed optical fiber sensing technology based on Brillouin scattering can accurately monitor and identify the pipeline temperature change. The temperature measurement resolution can reach 3 ℃ and spatial resolution of 1 meter in 25 km sensing fiber.

Accurate calculation of drill string’s hanging load is an important and crucial part in liner cementing process. The article analyse and research the stress about analysis of the drill-pipe，draw lessons from "Soft String Model", the drill string was divided into three parts which was vertical interval, deflecting interval and angle maintaining interval in this paper and formula to calculate hanging load & friction of each part was deduced through analysis of forces. Arc model and infinitesimal calculus were used in deflecting interval calculation. The calculation results tally with field actual weighting result, which verifies the rationality of the formula，that is worthy of popularization.

A series of MCM －２２zeolite catalyst samples were prepared with nitric acid，hydrochloric acid ，acetic acid and formic acid as the peptizators．The zeolites were characterized by means of particle strength apparatus and TG －DTA apparatus to investigate the effect of peptizators on the physical properties of MCM －２２catalyst．The results show that the strength and total acid of zeolites with inorganic acid as peptizator are higher than the zeolites with organic acid．With the increasing nitric acid dosage，the mechanical strength of the zeolite catalyst increases at first and then decreases，with the maximal catalyst strength being obtained at a dosage of １０%．The total acid is enhanced by adding the appropriate amount of nitric acid．Taking the alkylation of benzene with propylene as a model reaction，the catalytic performances of the MCM － ２２ zeolite catalysts were evaluated by means of a semi－continuous gas －liquid reactor and a liquid－liquid continuous reactor．The experimental results show that activity and selectivity of zeolite in inorganic acid is stronger than that in organic acid．When the nitric acid dosage is
less than ２０％，the activity of MCM －２２ zeolite is increased with increasing of nitric acid dosage．The selectivity to cumene reaches a maximum value when nitric acid dosage is １０％．