STUDY ON AUTOADAPTED SHIELDING TEMPORARY PLUGGING AGENT ZPJ

Shielding temporary plugging technique requires the diameters of temporary plugging materials must be matching with that of the pores in reservoir, otherwise, temporary plugging effect won’t be obtained. However, due to wide distribution of radius of pore throat, the traditional shielding temporary plugging technique can’t exert good shielding temporary plugging effects. Autoadapted shielding temporary plugging agent ZPJ can plug wide pore radius under unpredictability of pore radius and has good performance in permeability restored by back flow. The lab evaluation results show that permeability plugging ratio of ZPJ is near 100%, the strength of temporary plugging belt is above 9 MPa, permeability restored by back flow is above 90%.