METHOD FOR ELECTRICAL MONITORING OF RESERVOIR-COLLECTOR CHARACTERISTICS DURING DEVELOPMENT OF OIL DEPOSITS USING STEAM PUMPING Russian patent published in 2020 - IPC G01V3/04 

FIELD: oil industry.

SUBSTANCE: method includes drilling of a network of uncased wells with extraction of core with possibility of detecting a productive formation and detection of filtration-capacitance properties of rock. An electrode is run in each well on an insulated cable to the specified depth within the limits of the detected productive stratum and plugging of each of wells with cement with fixation on surface of earth piece of cable with length of 1.5–2 meters with possibility of connection to above electrode of measuring equipment. Measurements of ΔUEP between adjacent wells are performed so that system of closed adjoining triangular circuits is obtained. Discrepancy equal to sum of potential difference between borehole electrodes is calculated for each circuit. Further, taking into account the discrepancy, the measured ΔUEP values are corrected such that the sum of the corrected ΔUEP values on any closed loop is equal to zero. Potentials of other wells are then calculated relative to the reference well with potential equal to zero. Plan of isolines of potential is plotted. Plans are made for isolines of potentials obtained at different times with interval of 2–3 months between measurements. When comparing isolines, the direction of fluids movement in the productive formation, as well as the formation heating area, is determined. Resistance of grounding of electrode of each of monitoring wells is measured by double-beam scheme with interval of 2–3 months. Performing DC measurements between well electrodes and based on Ohm's law and current and voltage values calculating resistance R, which consists of coil resistance with connecting wire Rcw, cable resistance Rc, resistance of well electrodes Rwe and medium resistance Rmr between electrodes. For spatial and time analysis values ΔR1 = R − Rcw and ΔR2 = R − Rcw−Rwe are used, which contain information on change of medium resistance, including productive formation, between wells.

EFFECT: invention can be used to increase efficiency of development of shallow deposits of ultraviscous oil or bitumen.

1 cl, 6 dwg