The development of bottom water reservoir is affected by strong bottom water, low height of oil column, high viscosity of formation crude oil, and complex distribution of separation interlayer, etc. In order to solve the shortcomings of current conventional methods, such as large amount of multi⁃factor data analysis and application limitations, a new method based on BP neural network data mining algorithm for predicting recoverable reserves of horizontal wells in bottom water reservoir is proposed, and its reliability is analyzed by means of mathematical model. Aiming at the static and dynamic data of bottom⁃water reservoir, the effective hidden information is fully mined, and a data⁃driven model for the prediction of recoverable reserves of bottom⁃water reservoir is constructed on the basis of the establishment of basic data set. The results of practical application show that this method can realize the quantitative analysis of the influencing factors and the limit of technical parameters of horizontal well development in bottom⁃water reservoir, the maximum error of recoverable reserves prediction is less than 8%, and the fitting effect is good, which can be further applied to the research of production performance, development limit and well location design of horizontal Wells in bottom⁃water reservoir.

Extra high water cut has been the main development stage of bottom⁃water reservoir, due to water cut highly with great escalating rate in the initial. At present, the relative permeability curve endpoint has become a serious distortion. This paper presents a method to calculate the performance of water cresting with two phases flowing using the streamlines theory, good for solving the existing problems in the common method, as no pertinence, ineffectiveness and less affecting factors considered. Meanwhile, optimized relative permeability curve was calculated based on the research coupling genetic algorithm with bottom⁃water drive model. The result of numerical calculation based on optimized relative permeability curve showed that the histogram of technical reserves was matched basically with the real practice. This research could provide some instructional meaning to the application of dynamic prediction and developing the oilfield in bottom⁃water reservoir.

Oil displacement efficiency is one of the important parameters affecting the oil reservoir recovery, and the pore volume injection rate is the decisive factor that directly affects the ultimate oil displacement efficiency in the sweep zone. The semi quantitative relationship between the displacement efficiency and the injection volume of pore volume is derived by using the percolation equation expressed by the phase permeability index, combining with the BL theory and the Welge equation. The relation curve satisfies the life cycle theory and the quantitative relation expression between them is deduced according to the law of Logistic growth. At the same time, the optimal pore volume injection ratio is determined by the twoorder derivative curve. With the oil field entering the high water cut stage, the quantitative evaluation method of oil displacement efficiency is of great significance for evaluating the development effect of water flooding reservoir and tap the potential of the reservoir.

In order to explore the binary composite system interface characteristics of adsorption resistance and low tension, Texas500 spinning drop interfacial tensiometer and core flow device were used to measure the initial interfacial tension and simulate dynamic interfacial tension.The effect of interfacial tension and adsorption capacity was confirmed through the static adsorption experiments. The results showed that the new Ecompound system interfacial tension of 10 ^-3 orders of magnitude can also be formed when active dosage was as low as 0.05% and polymer concentration was up to 2 500 mg/L. Static adsorption proved that interfacial tension 10 ^-3 orders of magnitude can be maintained when amount of adsorption agent was little after first adsorption. Dynamic flow experiment results showed that even considering absorption and dilution, dynamic interfacial tension of the binary system can still maintain a 10 ^-3 orders of magnitude in 0.6 PV.

In order to study the contribution of each component in the flooding, the composite system concluding sulfonate gemini surfactant TADS10, polymer with a molecular weight of 15 million and Na2CO3 was used to conducte flooding experiments on a lithography glass model. According to oil displacement effect of composite system, the impact of the interfacial tension, polymers, alkali and organic pure on oil displacement was analyzed. The results showed that ultralow interfacial tension was generated by TADS10 and petroleum sulfonate complex which raised chemical flooding oil recovery by 2.6%. After adding the polymer binary system, chemical flooding recovery was increased by nearly 10% compared with a single system, and total recovery was increased by 12.13%. Chemical flooding recovery was increased by 2.73% when weak base ternary was added compared with binary system. The chemical flooding oil recovery was enhanced by 1.23% after adding 0.02% alcoholin the ternary system, and total recovery was increased by 1.31%.

Intermetal diffusion phenomenon will happen when metal matrix Pdcomposite membranes are under high temperature for a long time, which will influence the service life of the Pdcomposite membrane. By electroless plating, the palladium membrane on the surface of the porous metal supporter with different materials was prepared. And the Pdcomposite membranewas then heat treatment under high temperature in inert gas. Backscattered Electron Microscopy (BSE) and Energy Dispersive Spectrometer (EDS) crosssectional line scans were used to analysis the elements distribution of various Pdcomposite membranes, and the diffusion level of the metal matrix Pdcomposite membrane was studied by comparing it with the ceramic composite membrane. The results showed that there was no diffusion phenomenon happening to Pd/titanium (Ti) composite membranes and Pd/titaniumaluminum (TiAl) alloy composite membranes in the temperature range of 500 to 700 ℃, while serious intermetal diffusion phenomenon happened when Pd/porousstainlesssteel (PSS) composite membrane was under high temperature heat treatment (700 ℃) for 40

The influence of oil recovery on theology of waxy crude oil processed by nano-based pour point depressant was studied.The results show that nano-based pour point depressant for highly waxy crude oil is effective in reducing
solidification point and viscosity.The depressant was heated to 65℃,solidification point reduced to 17.5 ℃;The flow behavior under low temperature was better than oil temperature rise less.the oil temperature rise to 35℃,then reduced to 30
℃,the solidification point is 24℃under test.The solidification point of chemical modified crude oil retain steady under repeat
heat by 5 times,the stability is good and can support the transportation of highly waxy crude oil safely and economically.