METHOD OF MAINTAINING A SAFE RANGE OF FRACTURE CONDUCTIVITY WHEN PUTTING A WELL WITH HYDRAULIC FRACTURING INTO OPERATION Russian patent published in 2021 - IPC E21B47/10 

FIELD: well drilling.

SUBSTANCE: group of inventions relates to the field of technologies for bringing a well into operation, in particular, to the optimization of parameters that have a direct effect on increasing the productivity of a well after hydraulic fracturing (hydraulic fracturing). The method includes the following steps: select at least one pair of test wells with a single reservoir and field, determine the averaged reservoir properties (reservoir properties), geomechanical properties of the reservoir based on the characteristics of the drilled wells adjacent to the test wells located in the same reservoir and field. The dynamics of the wellhead and / or bottomhole pressure, phase flow rates are obtained when the mentioned adjacent wells are brought into operation. The estimated parameters of the fracture geometry are determined and the properties of the proppant, the parameters of the fracturing fluid, oil for adjacent wells are obtained. Preliminary modeling of hydraulic fracture cleaning and wells bringing the wells into operation is carried out using different scenarios of putting them on production for each test well based on the data obtained at the previous step. For each test well, the first and second scenarios of bringing the well into operation are determined, hydraulic fracturing is carried out in the test wells and one test well is brought out of each pair of test wells to the mode according to the first scenario, and the second test well from each pair of test wells is brought to the mode according to the second scenario. Data are collected from downhole and wellhead manometers, data on the concentration of suspended particles (SSP), water cut, flow rate by phases from test wells brought out in the first and second modes. Calibration of preliminary models of test wells based on the data collected in the previous step. For each test well, the optimal range of recovery scenarios is determined, which is in the interval between the first and second scenarios using calibrated models. On the basis of the optimal ranges of scenarios for putting the test wells into operation, the parameter intervals for bringing the production well into operation are determined, including at least the optimal rate of pressure drop, the duration and number of steps along the wellhead choke. Hydraulic fracturing is carried out and the working well is brought into operation according to the parameters determined in the previous step.

EFFECT: optimization of parameters that have a direct effect on increasing the productivity of a well after hydraulic fracturing (hydraulic fracturing).

25 cl, 3 dwg