Sustained casing pressure diagnosis device and method

Abstract

The invention provides a sustained casing pressure diagnosis device and method. The sustained casing pressure diagnosis device comprises a liquid level monitor for monitoring the liquid level in a sustained casing, a pressure sensor for monitoring pressure, and a flow meter for monitoring the blowout flow. A four-way joint is arranged at the position of a surface casing pressure corker and connected with a transmitting gun for monitoring the liquid level in the sustained casing, the pressure sensor for monitoring pressure and a high-pressure pipeline valve for gas blowout, and the flow meter and the pressure sensor are arranged on the high-pressure pipeline valve. The sustained casing pressure diagnosis method includes the steps of firstly, monitoring the current height of the liquid level in the sustained casing through the liquid level monitor, and calculating the current volume of the sustained casing according to the height between the liquid level and the well mouth; secondly, opening the high-pressure pipeline valve on the four-way joint of the sustained casing to conduct blowout, and calculating the volume of blowout gas through the flow meter; thirdly, monitoring the change between the pressure existing during blowout and pressure existing after blowout through the pressure sensor arranged on the high-pressure pipeline valve, and continuing to monitor the current height of the liquid level in the sustained casing through the liquid level monitor so as to judge whether leakage happens to the sustained casing or not.

Description

Technical field [0001] The invention relates to the technical field of production testing of oil and gas wells, in particular to an annular pressure diagnosis device and method. Background technique [0002] In the production test of oil and gas wells, in order to prevent the corrosive gas (such as H 2 S) If it leaks into the annulus, the casing is usually protected by filling environmental protection fluid to prevent corrosive gas from accumulating and corroding the casing near the wellhead. [0003] However, in the existing technology, the production wells of the Yinpuguang gas field generally contain H 2 S gas is relatively high, partly as high as 10% or more. High-sulfur gas leaks into the annulus, accumulates near the wellhead, and eventually corrodes the casing. The method of filling annulus protection fluid used in the early stage protects the casing. [0004] However, this method may cause the protection fluid to fail to protect the annulus due to the following situations: ...

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Problems solved by technology

[0004] However, this method may cause the protection fluid to fail to protect the annulus due to the following conditions: production string leakage leads to annulus protection fluid leakage well, casing string leakage causes annulus protection fluid leakage well, annulus protection fluid leakage Wells that are not fully filled and performance indicators of annular space protection fluid are unqualified

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