METHOD FOR DETERMINING LEVEL OF LIQUID IN ANNULAR SPACE OF OIL PRODUCT WELLS Russian patent published in 2007 - IPC E21B47/04 G01F23/296 

FIELD: well research, possible use for determining and controlling static and dynamic oil level in product wells.

SUBSTANCE: in accordance to method, signal s₀(t) is generated in form of a sum of rectangular impulses, changing time of n-th impulse and its duration depending on n. Generated signal s₀(t) is sent to generator of acoustic signal for generation thereof. Acoustic signal s₁(t) reflected from liquid is transformed to electric signal and subjected to analog-digital transformation. Signal s₀(t) is subjected to folding operation with digitized reflected signal s₁(t), and then temporary position of signal reflected from liquid is determined relatively to moment of generation of acoustic signal in inter-tubular space, using which, level of liquid is determined.

EFFECT: possible control over level of liquid in wells with high value of signal/noise ratio, resulting in decreased probability of error during computation of level.

5 dwg, 3 tbl