GB/T 43125-2023Specification for productivity evaluation of shale oil (English PDF)

3.1 Productivity evaluation

The process of evaluating the oil and gas production capabilities of production wells or development well groups at different stages.

3.2 Economic production life

The corresponding production time from when a normal production well or development well group starts to produce oil and gas to when the produced oil equivalent reaches the lower economic limit.

4.1 Applicable conditions for evaluation methods

4.1.1 Depending on the richness of the data, different methods are used to evaluate the productivity of production wells.

4.1.2 When well test data are available, the analytical method should be used.

4.1.3 When the production well has oil and gas production data for more than 12 months, the decline method should be used.

4.1.4 When a numerical model can be established for the evaluated area, numerical simulation method should be used.

4.1.5 When there are no wells drilled or put into production in the evaluated area and the following conditions are met, the analogy method should be adopted.

---The wells to be drilled or not put into production have the same or similar geological conditions, fracturing stimulation technology and intensity as typical wells that have been developed;

---Typical wells that have been developed have oil and gas production data for no less than 12 months.

4.2 Analytical method

4.2.1 Determination of key parameters

4.2.1.1 The key parameters for the analytical productivity evaluation include the effective permeability of the reservoir and fractures, the effective half-length of the fractures, the conductivity of the fractures, and the fracture conductivity.