METHOD OF QUANTITATIVE ESTIMATION OF PROFILE AND COMPOSITION OF INFLOW IN LOW-FLOW WATER-FLOODED OIL WELLS Russian patent published in 2020 - IPC E21B47/00 

FIELD: oil industry.

SUBSTANCE: invention relates to methods of determining a phase profile of inflow and devices for measuring and monitoring operating parameters of a low-flow oil well. Method of quantitative evaluation of profile and composition of inflow in low-flow oil welled wells consists in determination of volume fraction of light (more mobile) phase moving along the shaft. To specify real speed of globule (V) movement, a frame-by-frame measurement is used with the possibility of fixing passage of focal points of focal points by light-phase globules: either by a downhole video camera, placed in a video transparent medium, which is provided by setting the camera to two focal lengths, the difference between which L, with alternate switching of foci and alternate fixation; or by two synchronously operating video cameras spaced apart by distance L. Distance L is determined by mathematical expression L=v*3600/N, where v is approximate speed of light phase movement, N is number of frames per minute, provided by video camera. Thereafter, the light phase velocity is calculated from the mathematical expression V=L/dT, where dT is the globule displacement time within the length L. Then, the light phase flow rate is calculated from the mathematical expression Q=V*S, where S is the flow area determined based on measurements video camera at one of focal distances.

EFFECT: technical result is the quantitative assessment of the profile of the light phase (oil or gas) flow parameters in the multicomponent flow in the low-yield vertical and directional wells, mainly filled with water (id est in video transparency conditions of the barrel filler).

3 cl, 4 dwg