Automatic monitoring equipment for annular pressure of oil field gas well

Abstract

Automatic monitoring equipment for annular pressure of an oil field gas well comprises a controller, a pressure sensor, a pressurization mechanism and a fluid storage tank used for storing annular protecting fluid; the pressure sensor is used for monitoring the annular pressure of the oil field gas well in real time and generating a corresponding annular pressure signal; the controller is used for comparing the annular pressure signal with a preset pressure lower limit threshold, when the annular pressure signal is lower than the pressure lower limit threshold, the annular protecting fluid in the fluid storage tank is supplemented to the annulus of the gas well through the pressurization mechanism, pressurization is conducted till the annular pressure signal reaches a preset pressure upper limit threshold, the pressurization mechanism is closed, and pressure supplement is stopped. According to the automatic monitoring equipment for the annular pressure of the oil field gas well, the annular pressure is automatically limited within a safety threshold range by monitoring the annular pressure in real time, and safe and efficient production operations of the oil field gas well are guaranteed.

Description

technical field [0001] The invention relates to an automatic monitoring device for annulus pressure of gas wells in an oil field. Background technique [0002] In the process of drilling and completion, in order to separate different geological formations and prevent the well wall from collapsing due to different formation pressures, one or more layers of casing are required for cementing, and each layer of casing is cemented with cement. The space is filled with annulus protection fluid, and the pressure of the annular space between the casings of each layer is the annular pressure, which is generally called A annulus, B annulus, C annulus, etc. Due to sealing failure of tubing and casing (such as packers, sliding sleeves, etc.); micro-annulus in the cement sheath caused by gas channeling or post-operation in the completion cementing; low replacement efficiency during cementing; Pressure, temperature and pressure changes and some other reasons caused by the passage of time...

AI Technical Summary

Problems solved by technology

Due to sealing failure of tubing and casing (such as packers, sliding sleeves, etc.); micro-annulus in the cement sheath caused by gas channeling or post-operation in the completion cementing; low replacement efficiency during cementing; Pressure, temperature and pressure changes and some other reasons caused by the passage of time lead to the failure of the cement sheath; unreasonable selection of cement slurry system or formula design, etc. Annular pressure control is very important in the development of high-yield and high-pressure natural gas wells. If the annular pressure is too high or too low, the casing may rupture, and natural gas will flow into the surface, causing serious blowout and other accidents

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