Composite Plugging Removal Technology and Application in Low Permeability Oilfield

摘要

In an oilfield factory, the blocking and jam in Chang 2 reservoir is very serious. In recent years, according to analysizing different plugging mechanism and optimizing acidizing formula, the optimal plugging removal technology was formed suitable for the solution for the Chang 2 reservoir of oilfield factory. This plugging removal formula increases the efficiency radius, and increases the dosage of additives to protect the pipe, rod and pump from the precipitation such as Ca~(2+) and Mg~(2+), which causes new pollution. Reasonable multiple technologies were designed, and low displacement method was used in the injection process, aiming at the characteristics of Chang 2 reservoir. This method extends the time of plugging removal fluid staying around the well bore, which can eliminate plugging near well bore area effectively, and improve the permeability. DQ-1 composite plugging removal and other kinds of plugging removal methods have been used more than 50 times, and the effect is remarkable, which made a positive contribution to stable production of the oilfield.