METHOD OF A REMOTE MEASUREMENT OF THE LEVEL OF LIQUID IN THE GAS-LIFT BOREHOLES Russian patent published in 2004 - IPC

FIELD: control of boreholes parameters.

SUBSTANCE: the invention is pertinent to the field of the boreholes parameters control and may be used for a remote measurement of a dynamic level of liquid in the gas-lift boreholes. The problem of the invention is to increase efficiency of the measurements. The method includes transmission of a direct acoustic signal, reception of a signal reflected from of the "gas - liquid" mediums interface and definition of the time interval between the direct and reflected signals, which is used for determination of the fluid level. A direct acoustic signal is formed with the help of the controlled valve, that is linked through the inlet with the channel of the gas feeding and through the outlet- with the channel of low pressure. The valve control is combined with registration of the acoustic signals. Control of the process of registration is conducted in the real scale of time. The controlled valve may be installed in the borehole mouth and be linked through the inlet with a annular space and through the outlet - with a collector of the oil-and-gas manifold, or it may be installed the in the gas-manifold linking the valve inlet with distributing gas pipeline and the outlet - with a collecting channel. At the central layout of a gas lift the controlled valve may be positioned in the borehole mouth and link it through the inlet with the oil-well tubing and through the outlet - with the manifold. An inlet of the controlled valve may be linked with the by-pass pipeline and its outlet - with a separator, At that the valve may be used in turn by each borehole linked to the by-pass line. The level of the liquid may be determined with allowance for an actual sound speed in the borehole defined by the time interval between the direct signal and the signal reflected from the place of the pipes joint.

EFFECT: the invention allows to increase efficiency of the measurements.

6 cl, 1 dwg