EFFECT OF FRACTURING FLUID PROPERTIES ON FORMATION AND FRACTURES PROPAGATION
UDC: 622.276.66
DOI: 10.33285/0130-3872-2021-3(339)-42-45
Authors:
IZYUMCHENKO DMITRY VIKTOROVICH 1,
MALYSHEV SERGEY VLADIMIROVICH 1,
SEREDA NIKOLAY ELISEEVICH 1,
CHIKRIZOV ALEXEY IVANOVICH 1
1 LLC "Gazprom VNIIGAZ", Moscow region, Razvilka poselok, Russian Federation
Keywords: hydraulic fracturing, fracture propagation, fracture length, fluid leakage coefficient, fluid efficiency ratio, Fluid injection rate
Annotation:
Hydraulic fracturing technology is used to increase gas and oil recovery, involve weakly drained intervals opened by the well into the development, increase of well productivity and reduce the differential pressure drawdown. This study considers the process of fluid filtration through a fracture walls, which is determined by the volume of the fluid remaining in the fracture and the fluid filtered into the formation. It is indicated that the parameter of the fluid balance, being in the fracture and filtering through its walls is the fluid utilization coefficient, which depends on the coefficient of its leakage. This parameter is the main one. It is controlled by the operator during the operation. At low values (about 20 %), it is undesirable to carry out the operation, since there is a high probability that fluid leaks will exceed the injection fluid supply, and as a result, the fracture will close, the so-called "STOP" mode. The article demonstrates the dependence of the optimal fracture length on the injection rate of the process fluid and the leakage coefficient. The above-mentioned dependences provide a conclusion that the maximum fracture length that can be obtained is limited by the fluid leakage coefficient and the rate of its injection. The paper presents a method for determining the leakage coefficients. The properties of the hydraulic fracturing fluid can significantly affect the entire treatment process. Calculation of fluid injection rate and determination of fluid leakage rate is one of the most important aspects of hydraulic fracturing operation design.
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