There are numerous technical papers on fluid flow analysis which address, both Darsi's non-Darsi's filtration law. As for gas wells, as a rule, the quadratic correspondence-«depression squared-flow rate»-is used for the influx calculation.

Practical examples of the well survey (at the Yamburg and other fields in Tyumen) show, that the production curves, by no means always take the shape of a line on the graphs «depression squared-flow rate».

The filtration law breach does not always take place, and if a breach of the law occurs, it happens only in the near region of the well (at the distance of 1,5 ÷ 15 m).

Our calculations also show, that the production curves distortion often occurs not due to the filtration law breach, but due to the fact that a considerable influence of a number of parameters changes is not taken into account: from the reservoir and borehole pressure: such as supercompressibility factor, viscosity, volume factor.

The pseudopressure and pseudotime functions introduction to the calculation while processing the pressure build-up curves improves the calculation results insignificantly, as the corresponding averaging procedures of the mentioned parameters are carried out at the same time.

The influences of all the pointed out factors on the production curves behavior, as well as during the pressure build-up curves measurements in the wells with the hydraulic fracture and in the horizontal wells is particularly special.

The practical examples are given, showing a considerable difference of the reservoir calculation parameters, when the changing of the supercompressibility factor, viscosity, volume factor, while the pressure is taken into consideration.

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