METHOD FOR IN-BOREHOLE DETERMINING SPECIFIC WEIGHT OF FLUID COMPONENTS Russian patent published in 1997 - IPC

FIELD: study of boreholes in oil production. SUBSTANCE: method includes measuring the parameter under control in the process of borehole exploitation. The parameter is the weight of production tubing in point where it is suspended from. Fluid production is stopped in regular intervals to measure production tubing weight. Fluid and water specific weights are determined separately in the borehole. Where fluid specific weight is determined using the formula as follows: ; where V_t- is the volume of upper float installed above fluid dynamic level in the borehole, but lower than static level (cubic meters); Ptlow

- is production tubing weight when fluid level achieves lower boundary of upper float, H; Ptup is weight of production tubing when fluid level achieves upper boundary of upper float, H. Water specific weight is determined by the following formula: , where P_m is maximum weight of the production tubing that is not submersed into the fluid, H; V_l- is volume of lower float installed below pump inlet, (cubic meters); V_d- is volume of production tubing portion between the floats (cubic meters). EFFECT: higher accuracy. 2 dwg