Method and system for monitoring liquid level in oil jacket annular space

Abstract

The embodiment of the present application discloses a method and system for monitoring the liquid level in the oil casing annulus. The system includes: a signal transmitting device, a casing protection device, and a wellhead receiving device; the signal transmitting device is placed in the oil casing annular layer; The signal transmitting device is used to transmit wireless signals to the wellhead receiving device; the signal transmitting device transmits wireless signals according to preset parameters; the outer shell protection device is located on the periphery of the signal transmitting device and wraps the signal transmitting device The casing protection device is floating on the liquid surface of the oil casing annulus; the wellhead receiving device is arranged at the wellhead; the wellhead receiving device is used to receive the wireless signal sent by the signal transmitting device, according to the The received wireless signal determines the position of the liquid level in the annulus. It can quickly monitor the height of the liquid level in the annular space.

Description

technical field [0001] The present application relates to the technical field of gas production engineering, in particular to a method and system for monitoring the liquid level in an oil jacket annular space. Background technique [0002] Due to the high formation pressure, some gas fields contain corrosive media such as CO2 and H2S. In order to prevent the casing from being subjected to high pressure, most gas wells and gas storage wells are installed with production packers, and annulus protection is added to the casing annulus liquid to protect the casing. Due to the presence of corrosive media or the temperature and pressure changes during the production process, the threads and even the body of the oil pipe may leak. If the tubing leaks, the annulus protection fluid will continue to enter the tubing, even causing the annulus liquid level to drop to the point of leakage. Therefore, the position of the leakage point can be determined by monitoring the liquid level in t...

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Problems solved by technology

[0005] The inventor found that there are at least the following problems in the prior art: the liquid level monitor needs to continuously emit sonar pulse waves into the well, and the wellhead needs to provide a gas pressure source, and the wellhead equipment is relatively complicated

In the nitrogen height monitoring method, it is necessary to install a pressure gauge at the same time as the lower pipe string, and the position of the pressure gauge cannot be changed arbitrarily

Therefore, the existing methods or devices for monitoring the liquid level in the oil jacket annulus are complicated to operate and cannot quickly monitor the height of the liquid level in the annulus

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