Device for underground detecting sand production of oil well

Abstract

The invention discloses a device for underground detecting sand production of an oil well, which comprises an underground part and an aboveground part. The device comprises a detector, a transmission line, an optical fiber grating demodulator, a computer, and the like. An optical fiber grating accelerator and an ultrasonic sensor are arranged at a measuring nipple. The detector is transmitted underground by a winch through a stranded wire, at the damaged part of a sleeve or at the place near the damaged part of a sieve tube, the sands contained in the fluid strike a rotary impeller arranged in the detector so as to generate vibration and sound, the optical fiber grating accelerator and the ultrasonic sensor detect the signal and transmit the signal to the optical fiber grating demodulator arranged on the ground through a cable, then the signal is amplified, filtered, subjected to analogue-digital conversion, and then is transmitted to the computer, the computer performs power spectral-density analysis by analysis software so as to identify the information such as sand production amount and sand production depth. The device is characterized by simple structure, low cost, convenience in operation, and wide temperature and pressure application range; a new method is provided for the detection of sand production places of the oil well. The device is applied to the technical field of sand production place measurement.

Description

technical field [0001] The invention belongs to the technical field of oil well sand production point measurement, in particular to a device for downhole detection of oil well sand production. Background technique [0002] In production wells, due to quality problems of casing and sand control pipes, corrosion of downhole fluid, drilling, well completion, oil production and stimulation measures, etc., may cause damage to casing and sand control pipes. The result of its damage is the channeling between the formation and the wellbore, resulting in sand production in the oil well. Severe sand production in oil wells will cause sand burial in oil and gas layers, sand plugging in oil pipes, sand accumulation in ground pipes, etc., directly affecting the normal production of oil and gas wells. It is necessary to find a way to detect the sand production of oil and gas wells and determine the location of the downhole sand production point, so as to find out the fault location in a ...

AI Technical Summary

Problems solved by technology

The result of its damage is the channeling of the formation and the wellbore, resulting in sand production in the oil well.

Severe sand production in oil wells will cause sand burial in oil and gas layers, sand plugging in oil pipes, sand accumulation in ground pipes, etc., directly affecting the normal production of oil and gas wells

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