Method for monitoring average sand production rate of oil and gas well

Abstract

The invention discloses a method for monitoring the average sand production rate of an oil and gas well. The method comprises the steps that an ultrasonic probe is used for transmitting and receiving ultrasonic signals in an elbow pipe perforation accident high-incidence area; acquiring and recording residual wall thickness information of the pipeline according to the principle of an ultrasonic pulse reflection method; the difference value of the residual wall thickness of the pipeline recorded before and after the fixed monitoring time is substituted into the erosive wear equation; and the sand production mass flow is calculated according to the erosion rate determined by the erosion wear equation. According to the invention, the erosion wear equation is utilized to calculate the sand production rate, the influence of single measurement error and accumulative error in the monitoring process is avoided, only the pipeline wall thickness value in a fixed time length needs to be measured, the circuit is simple, the processing system is simple, the equipment reliability is high, the implementation is more accurate, and the failure of pipeline perforation can be found in time before the failure of pipeline perforation. And equipment can be replaced in time.

Description

technical field [0001] The invention relates to the technical field of sand production detection of oil and gas wells, in particular to a method for monitoring the average sand production rate of oil and gas wells. Background technique [0002] Oil and gas resources are an important part of energy. With the continuous deepening of the exploitation of deep unconventional oil and gas resources in my country, the problem of sand production in oil and gas wells has become prominent. Sand production in oil and gas fields includes quartz sand or proppant injected by large-displacement fracturing in the early stage. Or the original sand grains of the formation. Proper sand production can improve the production of oil and gas wells. However, serious sand production will cause damage to downhole casing strings, surface manifolds and equipment, resulting in potential safety hazards. [0003] Most of the existing on-line monitoring methods and monitoring devices for sand production are...

AI Technical Summary

Problems solved by technology

Proper sand production can increase the production of oil and gas wells, but severe sand production will cause damage to downhole oil casing strings, surface manifolds and equipment, causing safety hazards

[0003] Most of the existing on-line monitoring methods and devices for sand production are based on the principle of ultrasonic waves. Ultrasonic sensors (piezoelectric transducers) are used to detect the vibration signal of sand particles hitting the pipe wall, and the sand signal is extracted from the impact signal to obtain the instantaneous sand production rate. However, it needs continuous online monitoring for a long time, and the total sand output can be obtained by accumulating the sand output. The processing system is complicated, and it is easily affected by the cumulative error in the monitoring process, and the reliability is low.

At the same time, the wear and tear caused by the sand-carrying fluid on the pipe wall will cause perforation after a certain period of time, and some sand particles directly hit the surface of the ultrasonic sensor structure, causing distortion of the sand output measurement results and damage to the sensor structure. Due to the perforation hole, it cannot be found in time, thus affecting the sand detection results

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