It is difficult to accurately interpret reservoir fluid with complex oil⁃water relation, by the conventional two⁃dimensional or three⁃dimensional geochemical chart, because of the fuzzy oil⁃bearing or water⁃bearing representation reflected by single two or three geochemical parameters. On the basis of geochemical data validated by oil production test, the geochemical pyrolysis parameters that directly reflect the distribution relationship of oil, gas and water in the reservoir are constructed. Four geochemical parameters are constructed and three two⁃dimensional subgraphs are constructed, which realize the comprehensive and comparison analysis of oil⁃bearing and water⁃bearing characteristic of samples. The final reservoir interpretation is obtained through the analysis of comprehensive geochemical cross chart united pyrolysis gas chromatography and geological fluorescence. The application of geochemical cross chart has achieved good effects in Agadem block, Niger.

       In view of excessive water yield of L block in Daqing oilfield, studies of activated water driving system were conduct in Xing-12 test block. Combined with block reservoir condition, suitable surfactants were selected, and optimization of driving system for activated water was carried out by the result of laboratory physical simulation experiment. It can be found that oil/water interfacial tension effectively decreased and oil recovery was enhanced with addition of surfactant. And injection pressure also rises up with increase of concentration of surfactant. In the laboratory oil driving experiment, the growth range of recovery ratio tended to slow down when the mass fraction of 1 ^# activated water exceeded to 0.08%. Eventually the paper combines with experiment results and methods of economic assessment, the oil driving system suitable for Xing-12 test block is screened out. That is the mass fraction 0.08% activated water prepared with betaine type surfactant and formation water, and optimal dosage is 0.25 PV.

      The ice blocking could happen during the process of conveying products oil in the pipeline, because of the low temperature in north China in winter. The pipeline occurred ice blocking, not only oil transport was affected but also unnecessary damage of production was caused, and the potential safety hazard could exist when it became serious. Based on thenumerical simulation software FLUENT, the flow field distribution was calculated around the single and multiple ice blocks in products pipeline which were in different height. The research results showed that increasing with the height of the ice wall, the pressure difference of front and back produced nonlinear changes, the pressure distribution regularities of multiple ice also produced nonlinear changes. In the aspect of velocity, the velocity variation degree of front and back the ice block was relatively stable, but the velocity change process around the ice block was more obviously and layered effect was better, the speed distribution regularities of multiple ice blocks were similar to that of the single ice blocks.

The finite element method was used to compare and analyze fluid flow and mixing characteristics between three kinds of rotor mixer, 4WS,4WH and 6WI.The UG software was used to build 3D geometry models. The Gambit software was used to be grid division. And model was used to simulate the flow field of three kinds of internal mixer by BirdCarreau constitutive model and Polyflow software. By comparing the average velocity, the axial velocity and the shear rate, the flow patterns of the three flow fields were obtained. At the same time, the distribution of the mixture of the three parameters was described by using the parameters of the particle index, the average logarithmic stretch index, the probability of the particle index, the average mixing efficiency and the residence time distribution. The simulation results showed that, because of the special variable clearance rotor structure of 6WI rotor mixer, the flow field was more easily changed, and its mixing performance was higher than that of the other two kinds of rotor mixer.

In tertiary recovery process, there was a need of the static mixer promoting the polymer solution mixed with water to drive oil. Therefore, the mixing efficiency of the static mixer had an important influence on the efficiency of oil production. Based on that the mixing efficiency of the current commonly used static mixer was not high enough, a new type static mixer was developed. The flow characteristics of the fluid in the mixer were studied by the numerical simulation, and the simulation results were verified by the experiments and the performance of the mixer was measured. The result showed that the results of the simulation and experimental were in good agreement; the new type static mixer had the high mixing efficiency and mixing effect; the pressure drop of the static mixer met the requirement, and the best inlet rate was about 0.14 m/s

Spiral separator has the characteristics of simple structure, light weight and wellseparated effect, which becomes one of the commonest centrifugal separator currently. CFD method was used to simulate wateroil separation in spiral pipe under the condition of a variety of entrance velocities and cross section shapes, and obtained a wateroil separation result that for a spiral pipe with circular cross section shape, the separation effect became sharper as the velocity increased, and too fast or too slow velocity both impacted the effect. When they were equal cross section areas, circular had a better effect than laddershaped and square cross sections. Based on the numerical simulation, the result provided a certain theoretical basis for spiral pipe technology.