ABSTRACT
In view of the obvious incompatibility of conventional water shutoff and profile control in Jurassic reservoir, such as poor plugging effect and short validity period, the application of polymer microspheres is proposed to further improve the water drive effect. By analyzing the effect of polymer microspheres in implemented reservoirs, this paper evaluates the adaptability of polymer microspheres with different particle sizes, and finally establishes the application chart of polymer microspheres in Jurassic reservoirs, so as to provide technical support for the subsequent adjustment of microsphere injection parameters in Jurassic reservoirs. At the same time, aiming at the problem of poor adaptability of microspheres in some bottom water reservoirs, it is proposed to carry out the test of viscoelastic self regulating agent. Viscoelastic self regulating agent can not only increase the viscosity of displacement phase, but also improve the ability to enter small pores, show good viscoelasticity, and can solve the problems of effectively plugging large pores, deep migration demand, supplementing upper reservoir energy, etc, It can achieve the purpose of increasing oil and controlling water in Jurassic reservoir. Through research and practice, two understandings are obtained: ① polymer microspheres can reduce decline and control water cut in Jurassic reservoir. With the increase of permeability, the particle size of Jurassic reservoir should increase, so as to achieve good decline effect. When the permeability is less than 20md, the particle size of 100nm is better; When the permeability is between 20 ~ 40md, the effect of 300nm is better. ② In view of the maladjustment of some reservoir microspheres, the test of viscoelastic self regulator is carried out. The results show that viscoelastic self regulator can stabilize oil and reduce water.
