GB/T 41612-2022Technique specification of shale gas production appraisal (English PDF)

4.1 Data collection

The information to be collected includes but is not limited to the following.

a) Reservoir parameters. target horizon, original formation pressure, original formation temperature, medium depth of reservoir, reservoir thickness, porosity, permeability, permeability rate stress sensitive data (if any), isothermal adsorption test data, water saturation, pore compressibility coefficient, free gas ratio;

b) Wellbore parameters. wellbore structure, wellbore trajectory, length of horizontal section;

c) Fracturing parameters. length of fracturing section, number of fracturing sections or clusters, amount of fracturing fluid, amount of proppant, displacement, sand ratio, pump pressure;

d) Fluid parameters. gas composition, gas relative density, gas compressibility, gas viscosity, gas diffusion coefficient (if any), produced water ore degree (if any);

e) Gas extraction method;

f) Flowback data. liquid flow, gas production, casing pressure, oil pressure during flowback;

g) Production data. see Table 1;

h) Dynamic monitoring data. static pressure, production flow pressure, wellbore pressure gradient, static temperature, flow temperature, wellhead temperature, wellbore temperature gradient, production profile test data (if any), microseismic test data (if any), tracer test data (if any);

i) Other data. It is necessary to determine the necessary data according to the selected yield forecasting method.

---If the production prediction method based on pressure recovery well test is selected, pressure recovery data is required;

---If the production prediction method of the productivity well test method is selected, the productivity well test data is required.