METHOD FOR DETERMINING FLOW PROFILE IN LOW-RATE HORIZONTAL WELLS WITH MULTI-STAGE HYDRAULIC FRACTURING Russian patent published in 2019 - IPC E21B47/10 

FIELD: mining.

SUBSTANCE: invention relates to the field of geophysical studies of oil wells in oil fields with low-permeability reservoirs in the conditions of ambiguity of measurements performed on the flow of fluid in the downhole conditions, in particular, to determining the profile of the flow of fluids entering the well, which carried out a multi-stage hydraulic fracturing. Method includes the descent into the well of the flow meter in the complex of geophysical instruments, the subsequent injection of fluid into the well through the hydraulic fracturing ports, during which, due to the creation of a high fluid injection pressure, the intervals corresponding to the hydraulic fracturing ports are measured, the flow meter is measured during ascent and descent until the bottomhole pressure of the total fluid flow is controlled, which is controlled by wellhead measurements. Injectivity distribution of the fracture ports is calculated by processing the flow meter readings taking into account the direction and speed of its movement, and the flow profile is determined from the condition that the productivity of the ports from which the fluid flows is proportional to their injectivity during fluid injection. In wells with a two-phase fluid containing oil and water, studies in the discharge mode are performed sequentially when pumping oil and water.

EFFECT: proposed method allows with high accuracy to determine the flow profile in low-rate horizontal wells by increasing the information content and accuracy of measurements.

1 cl, 1 dwg