METHOD FOR MONITORING UNDERGROUND WASTE DISPOSAL DURING DRILLING CUTTINGS FOR REINJECTION INTO RESERVOIR Russian patent published in 2023 - IPC E21B49/00 E21B47/06 

FIELD: waste management.

SUBSTANCE: invention is related to determining the behavior of a fracture in rock formations, during drilling cuttings for reinjection operations. A method for monitoring underground disposal of waste during drilling cuttings for reinjection into a reservoir is claimed, including obtaining characteristics of pressure behavior over a period of time corresponding to the studied period of well operation, interpretation of pressure characteristics during a specified period of time to determine the behavior of a fracture in reservoirs, identifying risks associated with waste disposal, characterized by the development of uncontrolled vertical fracture growth and the threat of fracture penetration into undesirable reservoirs, and the implementation of a solution based on the identified risk and consisting of optimization of waste injection parameters and their properties. At the same time, the change in the fracture closing pressure is determined by the actual injection of waste during the entire period of operation of the well, and the behavior of the fracture in the reservoirs is determined by the actual change in the formation stress relative to the volume of waste, taking into account the comparison of changes in the actual fracture closing pressure with the simulated change in the formation stress. The presence or absence of risks is determined by the relative position of the curve of the simulated stress of the formations and the points of the actual fracture closure pressure. Then, the influence of each type of waste on the change in the fracture closure pressure is identified, which determines the necessary optimization of waste injection by changing the injection intensity, properties and volumes of injected waste.

EFFECT: increase of accuracy of assessing behavior of a fracture, as well as the reliability of determining the risks associated with deviations from the normal development of a fracture in rock formations during waste injection

3 cl, 6 dwg