Study on Field Test and Plugging Simulation of the Knot Temporary Plugging Agent

The existing temporary plugging evaluation methods cannot simulate the pumping process and plugging process. To quantitatively evaluate the plugging effect of the knot temporary plugging agent, based on the high-pressure delivery system of the temporary plugging agent and the plunger pump system, it carried on the ground simulation test. The results showed that the knot temporary plugging agent had an excellent plugging performance. The numerical simulation method calculated the flow field, and the velocity field and pressure field with the different number of perforations and different displacements were analyzed. When the number of perforations was few, the total flow rate, the flow rate through the perforation, and the negative pressure were significant. But the suction force on the temporary plugging agent was too large, which may lead to the failure of the temporary plugging agent. For 12 perforations, when the flow was small, the negative pressure at the perforation was too small to suck the temporary plugging agent into the perforation. For 12 perforations, when the flow was 2 m3/min, the maximum speed of the perforation was 47.5 m/s, and negative pressure of 1.25 MPa was formed inside the perforation relative to the wellbore. The negative pressure could effectively suck in the temporary plugging agent. The research results can provide a theoretical basis for the optimization of the fracturing temporary plugging process.