裂缝非均质油藏注CO2驱防气窜弱凝胶体系的研制及评价

Development and Evaluation of Technology of Injection of CO2 Flooding Anti-Gas Channeling Weak Gel System in Heterogeneous Fracture Reservoir

针对JZ25-1 S油田非均质裂缝低渗高矿化度的油藏特征,研制了一种适合该类油田的防气窜弱凝胶体系,并对该体系的耐温、耐矿化度及注入性能进行了评价。注CO2驱防气窜弱凝胶体系配方为:1 500 mg/L JHW-5+100 mg/L JLJ-1+100 mg/L WDJ-1+60 mg/L HSJ-1。该防窜体系具有较好的热稳定性和耐矿化度性能,在非均质储层中的注入具有选择性,在低渗透层中的压力梯度明显高于高渗层。

In view of the characteristics of heterogeneous fracture, low permeability and high salinity in JZ25-1 S Oilfield, an anti-gas channeling weak gel system was developed, and the temperature resistance, salinity tolerance and injectability of this system were evaluated. The formulation of this anti-gas channeling weak gel system is 1 500 mg/L JHW-5 + 100 mg/L JLJ-1 + 100 mg/L WDJ-1 + 60 mg/L HSJ-1. This anti-gas channeling weak gel system has good heat stability and salinity tolerance, and has selectivity when injected into heterogeneous reservoir with the pressure gradient in low permeability formation being significantly higher than that in high permeability formation.