Analytical and experimental study of stress sensitivity effect on matrix / fracture transfer in fractured tight reservoir
| Autor: | Lianjing Xia, Kai Liu, Yeheng Sun, Daiyin Yin |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Effective stress 02 engineering and technology Mechanics 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Transfer function Volumetric flow rate Permeability (earth sciences) Fuel Technology 020401 chemical engineering Initial permeability Initial value problem 0204 chemical engineering Shape factor 0105 earth and related environmental sciences Pressure diffusion |
| Zdroj: | Journal of Petroleum Science and Engineering. 195:107958 |
| ISSN: | 0920-4105 |
| DOI: | 10.1016/j.petrol.2020.107958 |
| Popis: | In fractured tight reservoirs, the stress sensitivity effect has important impacts on the law of pressure diffusion as well as the matrix/fracture transfer flow, which is the main fluid migration way. In this paper, the stress sensitivity effect is considered to establish the matrix/fracture transfer flow model, and the transfer shape factor and transfer function are deduced. According to the characteristics of the simplified model, the 1D and 2D matrix/fracture transfer flow experiments considering the stress sensitivity effect are designed, and the theoretical model is verified. Then, the stress sensitivity tests and transfer flow experiments are carried out, the influences of stress sensitivity factors (lithology, initial permeability and effective stress) on transfer flow are studied. The experiment results show that the average errors of matrix average pressure, transient transfer flow and cumulative transfer volume flux are 3.6%, 4.8% and 5.2% respectively, and the calculation accuracy is high. The stress sensitivity of the Glutenite is the strongest, the Turbidite the middle and the Beach bar sand the weakest; the smaller the initial value of permeability is, the stronger the stress sensitivity is; the bigger the effective stress is, the more the permeability loss is. Due to the differences of stress sensitivity effect, the stronger the stress sensitivity is, the faster the transient transfer flow rate drops, and the fewer the cumulative transfer volume flux is. The new transfer flow model is applied to the well test interpretation theory, and the fitting results of the real pressure build-up data show that the new well test type curve has better fitting effect on the unsteady matrix/fracture transfer stage with an error of 4.2%, which is 25.6% lower than that of the classic theory. |
| Databáze: | OpenAIRE |
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