Study On Dynamic Change Of Gel.type Profile Control Agent And Its Effect Evaluation

With the continuous development of tertiary oil recovery(ternary compound flooding)technology,the main reservoir thickness is large and the heterogeneity is serious.The injection liquid often penetrates into the high permeability parts of the deposition unit along the thick oil layer,resulting in the ineffective circulation of the chemical agent Increasing the recovery of crude oil,in order to further improve the heterogeneity to the oil field development of the side effects,it is necessary to implement the depth profile control technology.Polymer flooding can significantly increase the volume of injected water,improve the development of non.homogeneous oil field,and improve oil recovery.However,with the oilfield mining into the middle and late period,especially in the near well area repeated repeated plugging,the oil saturation greatly reduced,the reservoir pore structure changes dramatically,a large number of injection system along the high permeability layer or ultra.high permeability layer to do invalid and Inefficient cycle,reducing the polymer flooding effect.Therefore,it is very important to carry out the technology of ternary composite flooding depth profile control.In this paper,we aiming at the rheological properties and dynamic migration law of the ternary compound flooding depth profile control agent,the dynamic regulation of gel type profile control agent and the effect evaluation were carried out.The two.pipe parallel model is used to simulate the distribution and pressure changes of ternary and ternary after different penetration rates(3.0,2.6 and 2.25).Compared with the three.(1500mg / L,3000 mg / L)gels and the effect of the combination on the flow distribution after profile control were studied by using the three.tube parallel core model.The effects of the flow rate and the pressure distribution on the flow distribution were analyzed.The effects of different injection times on the effect of gel profile control and flooding were studied by using the three.dimensional heterogeneous model with permeability variation coefficient of 0.55.(0.55 and 0.65)on the effect of the profile transfer oil.The effect of different stages of profile control on the oil displacement effect was calculated by using the three.dimensional visualization model.The effect of different profile control on the overall effect was compared.The change of saturation field and pressure field during profile control is given.