In order to explore the water control mechanism of buried hill crack reservoir section, taking Huizhou 26?6 condensate field as an example,the fracture gas reservoir water control physical experiment model,equilibrium gas water interface and piecewise water control experiment evaluation were established,through designing the experimental parameters,buried hill crack formation and water control process.The results show that the segmented water control can effectively prolong the water?free gas production period and delay the water breakthrough time to a certain extent.The different combination of crack and horizontal well section would induce diverse gas production characteristics.Coupling between horizontal well subsection water control and gas reservoir seepage was a complex process.The matching between blind pipe section and production section directly affects the gas well productivity.The opening degree of production section,the length and the location of blind pipe section are the main factors affecting the productivity of fractured gas reservoir.The research results will establish a sublevel water control development model for buried hill gas reservoirs and provide good technical support for rational and scientific research on water control of horizontal wells in offshore condensate gas fields.

In order to further improve the recovery of oil after binary composite flooding in offshore oil fields,based on the development contradiction existing after the binary flooding,combined with the indoor physical simulation experiment,three different combinations of oil displacement systems were designed on the basis of conventional oil displacement agents. According to the characteristics of the reservoir after the binary flooding,three kinds of high concentration polymer flooding,high concentration polymer + two yuan and heterogeneous phase were proposed and compared with the experiment. The results showed that the three experimental schemes showed different degrees of secondary decline in water,the shunt rate of the high permeability layer decreased,and the shunt rate of the medium and low permeability layer increased.The recovery rate of experiment was 13.55%,10.93% and 16.05%,respectively.It provides technical support for subsequent profile optimization and individual well personalized design,which lays the foundation for the completion of a set of recovery technology method system after a set of two yuan flooding.

Interaction between three surfactants and hydrophobically associating watersoluble polymers (HAWP) were studied. The experimental results show that the interactions differ according to the types of surfactants. Viscosity increases and interfacial activity decreases for the interaction of alkanolamide or petroleum sulfonate and HAWP, while viscosity decreases and interfacial activity remains consistent for the interaction of betaine and HAWP. With the increase of substituent carbon numbers, interactive force decreases between sulfonates and HAWP, and increases between betaines and HAWP. The force sequence of interaction between surfactants and HAWP is alkanolamide,sulfonate,betaine under the same low substituent carbon numbers. 

For achieving a better understanding of the effects of wettability on the oil recovery,the core displacement experiments were carried out.By using outcrop man-made cores with low,middle and high permeability,and convertingcores wettability from water-wet and oil-wet to intermediate wet,the oil recovery efficiency after water flooding on the cores was studied.The results show that converting cores wettability from water-wet and oil-wet to intermediate wet is favorable to decreasing maximumly the capillary force as a resistance force in reservoir pores,and enhancing water displacement effects.So the suggestion that the wettability of water-wet and oil-wet should be changed into intermediate wet on the experimental condition.