Methods And Effect Evaluation Study Of Water Shut-off And Profile Control

With the development of exploiting, high water cut stage arrival, a series of serious problems is getting worse: the remaining oil is highly fragmented, the control degree of water flooding is less and interference between layers is Serious.For such a complex reservoir, profile control is an effective way of expansion of the waterflood sweep efficiency and the relatively short construction period, the relatively low cost, relatively quickly results. A clear understanding of the water shut-off mechanism is of great significance to improve the water shut-off effect in different fields.In this paper, profile control agents such as cationic gel, polymer microspheres, pre-crosslinking water-swelling have be studied in-door. At the provided by the formation produced and injected fluid, we have a test of the optimization of cationic gel-forming, and a core-injected experiments wiht optimal formula. We have measured the particle size distribution under the different conditions, the properties of a variety of water-swelling for its expansion and the expansion of multiples rate under different conditions, and studied the block coefficient of the different size of water-swelling for different cores permeability. The theory of Distance profile control and near block was Expounded, with non-homogeneous unconsolidated sand tube model, through the recovery experiments, In this paper, through the recovery experiments, with non-homogeneous unconsolidated sand tube model, the optimization of composite slug particles in the deep profile is studied.The result said that, in given formation water and high temperature, the cationic gel has a good nature, hard dehydration and very high block coefficient. Granular type plugging agents swellable and microspheres can be removed deeply in the strata and have a good volume expansion. As a deep profile agent, according to different permeability strata, granular type plugging agents can be selected in different size. The optimization of the size,order and other issues about composite blocking agent, has a major guiding significance for the actual oilfield blocks overall profile.