Abstract
Today, number of fracturing operations (fracturing) is increasing every year due to the development of low-permeability formations classified as hard-to-recover formations. The actual task is to determine parameters of fracture obtained in order to confirm the planned design, toimprove technology of fracturing fluid injection and proppant, toprevent premature watering and to frac non-target reservoirs. The fracture properties do not remain constant over time: under the influence of rock pressure, the proppant is compressed and destroyedandduring production part of proppant is washed out of fracture. Therefore, it is also important to monitor the change of fracture parameters over time.
Technologies are known to determine the fracture parameters [16, 17]. Anywork aiming at developping accessible technologies with high level informativeness is relevant: Temperature transient ananlysis is one of them.
Thermometry method is actively used in borehole geophysics. Unlike well tests (hydrodynamic studies), thermometry allows individual characteristics of each formation (inflow intervals) to be obtained in case of a multi-layer system.
Thefield results and theoretical studies have shown that temperature is sensitive to the presence of fracture: by means of temperature measurements in the well, the fracture height is determined reliably now. An important task is to determine thefracture geometry - length, width, azimuth direction. The complexity of this problem solutionis due tothe fact that thermohydrodynamic processes in reservoir – fracture systemhas not been yet sufficiently studied. Therefore, theoretical studies are needed to study the effect of fracture on temperature and pressure fields in reservoir. In the presented work the problem is solved with help of mathematical modeling:analytical solutions are obtained and numerical model is developed. The results of multivariate calculations and their comparison with field data of temperature recovery in wellbore are presented.
