SU365460A1 - METHOD OF MEASUREMENT OF OIL DEBIT IN WELLS WITH STAGENT WATER - Google Patents

Description

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The invention relates to the field of measuring a small flow rate of oil and determining the location of its flow in stagnant water wells.

Methods are known for measuring the flow rate of oil in wells with stagnant water, based on the overlapping of the cross section of the well by a packer.

In order to improve the measurement accuracy of the proposed method, the oil flow rate is determined by the time of moving the water-oil section from the upper to the lower limit of a fixed volume under the packer.

The drawing is a schematic diagram of the device for implementing the proposed method, where the arrow shows the direction of water flow, and the arrow shows the direction of oil flow.

The device contains an absolute packer (for example, an inflatable rubber gloom, a water-oil position position sensor 2 (BHP), for example a y-density meter, operating according to the 7-translucency method and located below the packer a, and a discharge pipe 3 through which the upward flow of water .

In the pipe there is a sensor 4 for the flow rate of water, for example a sensor of a hot-wire anemometer. From the branch pipe through the system of pipes 5, the liquid is discharged into the well interval located above the packer. The space below the packer, limited by the entrance of the branch pipe and the walls 6 of the well, forms a zone,

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in which drops of oil 7 are barbed through water. The sensor of the polarization of the PRC is installed in the zone / accumulation of oil at a fixed distance from the packer.

so that the flow of fluid in the discharge pipe does not affect the measurement results. The oil production rate is measured at a specific depth. At the flow rate measurement point, the packer is opened and the liquid rushes into the discharge pipe.

At low oil and water flow rates, the oil moves along the wellbore mainly due to gravitational forces in the form of floating drops 7, and the change in oil flow rate changes the number of drops passing the well section per unit time. Since the cross section of the branch pipe is smaller than the cross section of the well, the main part of the drop oil passes by the entrance of the branch pipe and accumulates under the packer in the accumulation zone (a kind of oil trap). This produces a BHP that, as the oil accumulates beneath the packer, moves down to the inlet of the drain pipe. By installing a VHP position sensor above this input, it is possible to measure the oil filling time of a certain volume in the accumulation zone k.

The graph shown in the drawing illustrates the process of filling a fixed volume with oil when used as

y-raft oil / water sensor