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I. Injection and Production Pump Overview: The injection and production pump is a simplified injection pump designed for steam flooding/huff-and-puff operations in high-temperature heavy oil wells. Its core feature is dual-use injection and production: simple and reliable conversion between injection and production. The injection and production pump utilizes a large-diameter, long-stroke pump barrel and plunger, effectively increasing fluid production. A dedicated disconnector for large pumps is used to disconnect the plunger from the sucker rod. The upper outlet valve and lower portion of the plunger are machined with sharp-angle scraping edges. In annular thermal recovery wells, the reciprocating motion of the plunger continuously removes scale and sand from the inner wall of the pump barrel, reducing and preventing sand blockage. The injection and production pump is suitable for pumping heavy and extra-heavy oil under challenging conditions such as high temperatures and sand content. The heavy oil pump successfully addresses the challenges of extra-heavy oil recovery.