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With the rapidly increasing number of patent applications in China, each applicant tends to accumulate the quantity of patent, but not the improvement of patent quality. Therefore, the State Intellectual Property Office (SIPO) has recently issued a package of notification, which aims to reverse the status quo. However, existing methods of regional patent evaluation still emphasize on quantity rather than quality indices, which leads to biased evaluation results. In this paper, we establish a comprehensive index system for regional patent evaluation. The indicators of the system consist of four dimensions, including quantity, quality, structure, and coordination. This aims to provide a path of high-quality development for regional patent work. Based on the patent data of each city in Sichuan Province in 2020, this paper validated the effectiveness of the comprehensive evaluation system and put forward countermeasures and suggestions. [ABSTRACT FROM AUTHOR]

Shale gas wells in the Changning block of Weiyuan, Sichuan, China, experience water production problems throughout their life cycles. In actual field production, plunger lift is typically used to discharge liquid from a shale gas well. However, it is difficult to test the formation inflow performance relationship curve (IPR) of a plunger lift well. Hence, data on the formulation and optimization of plunger lift well systems are lacking. Based on actual measured data related to casing pressure changes at the wellhead and the gas-liquid distribution characteristics in a wellbore during the shut-in phase, this paper establishes a method for calculating the formation IPR curve of a shale gas plunger lift well by calculating changes in wellbore gas volume continuously. This method has a fast calculation speed. The gas-water interface distribution can be obtained in 3–5 iterations, and the inflow dynamic curve can be calculated in less than 5 seconds. This method tested the IPR curves of gas wells in the Changning block. The IPR curves of plunger lift wells showed concave characteristics contrary to the conventional upward convex curves. This is because the bottom hole flowing pressure changes caused variations in the water saturation of the near-wellbore zone. Consequently, the productivity equation of the plunger lift well is established by introducing the variation coefficient of water saturation expressed by bottom hole flow pressure. This equation fits with the measured IPR curve with an average R2 of approximately 0.9989. [ABSTRACT FROM AUTHOR]