Resume
Interpretation of well testing data allows one to estimate the reservoir state and to choose the corresponding well interventions. However, pressure transient test does not provide detailed information about the state of bottomhole formation zone. One of the methods to increase the number of defined parameters is consideration of temperature dynamics in flowing or shut-in well.
The goal of the present work is development of program code for numerical study of temperature and pressure in production and injection wells. Numerical technique is based on the finite-volume method. Mathematical model describing the distribution of temperature and pressure in the reservoir and the well, taking into account the effects of temperature, such as the Joule-Thomson effect and adiabatic expansion, is considered. Three-dimensional statement allows one to consider complex geometry of the well, hydraulic fractures of different geometry and the anisotropy of the formation.
On the base of numerical simulation the comparative analysis of temperature and pressure distribution in the reservoir and the well with and without fracture is conducted. It is shown that the consideration of the full model "well-formation" is important, because the temperature dynamics in the well and bottomhole formation zone can differ essentially. It is observed that the temperature front in hydraulic fracture propagates faster, than in the reservoir. Effects influencing on the temperature in the injection well differ significantly from the temperature effects appearing in production wells. In production wells the appearance of throttling warm up of liquid on the borders "well-reservoir" and "fracture-reservoir" is observed, the temperature effects are stronger in the presence of the fracture. It is observed the rapid cooling of productive formation due to the convective thermal conductivity and gradual cooling of surrounding rocks due to the conductive thermal conductivity in wells with cold injection.
Developed program code can be useful to design well interventions for cleaning of bottomhole formation zone due to detailed information about state of bottomhole formation zone and hydraulic fracture.
