The Research Of Injection Wells Profile Control Technology In BaiYu Shan Area

After more than10years development of water-flooding reservoir porestructure and permeability of BaiYushan Oilfield has undergone great changes. The tradiction between the layers or in the layer is further exacerbated. High permeability or the seepage advantage channels are come into being. The situation of water flooding and the distribution of remaining oil have become increasingly complex. It is becoming increasingly difficult to keep a stable productivity. This not only greatly affect the degree of recovery of crude oil, but also increased the cost of oil production. The water channel or high permeability sandstone formation must be blocked for enhancing oil recovery.Deep profile control technology as aneffective means to reduce the well water content and enhanced oil recovery, has become the key to sustainable development of this old oilfield.This thesis based on the geological characteristics of the reservoir and fluid properties BaiYushan area in Jing’an Oilfield, through its fractured reservoir characteristics and heterogeneity, to carry out the indoor experiment preferred polymer profile control agent’s formulations.The best formula is preferred a partially hydrolyzed polyacrylamide (HPAM) polymers, together with the cross-linking agent, accelerator and stabilizer. Profile control agent is evaluated through the static test and dynamic core flow tests in low permeability fractured reservoir conditions gelation time, into a gel strength, salt resistance, temperature resistance, stability over time, compressive strength, select injectioninjection profile improvement rate and oil displacement efficiency. Experimental results show that:the weak gel profile control agent into the gel time and into the gel strength is moderate, good stability, good plugging effect of different permeability cores. The weak gel profile control agent can be used to improve the water absorption profile of the formation, its overall performance to meet BaiYushan Oilfield reservoir profile control operational requirements.