Oil field gas well annular pressure automatic monitoring equipment

Abstract

Oil field gas well annular pressure automatic monitoring equipment, which includes a controller, a pressure sensor, a booster mechanism and a liquid storage tank for storing annular protection fluid; the pressure sensor is used to monitor the pressure of the oil field gas well annulus in real time and generate a corresponding Annulus pressure signal; the controller is used to compare the annulus pressure signal with the preset pressure lower limit threshold, and when the annulus pressure signal is lower than the pressure lower limit threshold, the annulus in the liquid storage tank will be protected by the pressurization mechanism The liquid is supplemented to the annulus of the gas well to pressurize until the pressure signal of the annulus reaches the preset pressure upper limit threshold, and the booster mechanism is turned off to stop the supplementary pressure. The invention monitors the pressure of the annular space in real time, automatically limits the pressure of the annular space within the range of the safety threshold, and ensures the safe and efficient production operation of the gas well in the oil field.

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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