id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
fcis-11155	Yang, Huohai; Liao, Qingrong	Well Testing Analysis Method and Practice for Low Permeability Gas Reservoirs	2023	4	.pdf	application/pdf	2925	123	51	Division of Flow Stages Based on the calculated typical inclined well pressure of fractured and vuggy reservoirs, and based on the characteristics of the bottomhole dimensionless pressure and its derivative curve, the well testing curve is divided into 8 flow stages: the wellbore storage effect stage (Stage I), which reflects the flow characteristics of crude oil in the wellbore during the initial well opening period, has a derivative curve slope of 1; The skin effect stage (Stage II) reflects the pollution situation in the near wellbore area, and its derivative curve shows a hump shape; The early radial flow stage (Stage III), linear flow stage (Stage IV), and transitional flow stage (Stage V) that reflect the characteristics of inclined well seepage (Figure 6a-c) have derivative curves of horizontal, oblique, and arc lines, respectively; The derivative curves of the karst cave towards fracture flow stage (stage VI), karst cave towards matrix, and matrix towards fracture flow stage (stage VII), which reflect the fluid exchange between the triple media of the reservoir, all show a concave shape; The overall radial flow stage (Stage VIII) under infinite geological boundary conditions (Figure 6d) has a derivative curve slope of 0. Conclusion (1) The typical well testing curves of inclined wells in fractured and vuggy reservoirs are divided into 8 fluid flow stages: wellbore storage effect stage, skin effect stage, early radial flow stage, linear flow stage, transitional flow stage, karst cave to fracture channeling stage, karst cave to matrix and matrix to fracture channeling stage, and overall radial flow stage.	cache/fcis-11155.pdf	txt/fcis-11155.txt