Abstract
The correct use of temporary plugging agents for chemical diverting fracturing technology is the key to stimulate reservoir volume be expanded in the oil and gas industry. By injecting the temporary plugging agents into the initial fracture to form a plugging body with higher strength, so as to force the subsequent flow pressure to divert to other positions to open more new fractures, and then remove the plugging. Based on this background, this paper divides the action mechanism of the temporary plugging agent into four parts, which are introduced respectively. It can be found that the plugging structure can be divided into single structure and composite structure. Faced with development of harsh reservoirs, the composite plugging structure has the highest success rate, but there have always been problems such as complex combination optimization, higher material cost, and difficult flow back. The supercharging mechanism essence is to increase the fracture restart pressure. The diverting mechanism is related to stress redirection, which depends on the superposition of stress states around the fracture, but the difficulty is that there is no suitable method for accurate stress analysis. The mechanism of plugging removal mainly includes three functions: dissolution, degradation and breaker, but each has its own limitations. In addition, through the investigation of new temporary plugging agent materials, it is found that the temperature-controlled temporary plugging agent is in line with the future development trend. To sum up, the findings of this paper will help to better and quickly understand the overall action mechanism and main control factors of temporary plugging agent for diverting fracturing, and also provide theoretical guidance and enlightening suggestions for the performance optimization and future development of temporary plugging agent.
NSTL
Elsevier