Device and method for monitoring annular trap pressure in deep water well

Abstract

The present invention relates to a deepwater well annular trap pressure monitoring device and method, characterized in that the pressure monitoring device includes a downhole device, a signal receiver and a ground device; the wellhead of the deepwater well is fixedly connected to the signal receiver, the The signal receiver is connected to the ground device; the outer wall of the inner casing of the deep-water well is fixedly connected to the downhole device, and the downhole device is used for real-time measurement of the annulus temperature data and the annular trap of the deep-water well shaft The pressure data is loaded into the carrier signal and sent to the signal receiver; the ground device is used to decode the carrier signal received by the signal receiver to obtain the real-time annular temperature data and annular space temperature data of the deep-water well shaft. trap pressure data, the present invention can be widely used in the technical field of offshore oil and gas wells.

Description

technical field [0001] The invention relates to a monitoring device and method for annular trap pressure, in particular to a monitoring device and method for annular trap pressure of deep water wells. Background technique [0002] Annular pressure build-up APB (Annular Pressure Build-up) is due to the expansion of the fluid in the annular space between the sealed casing layers due to the temperature rise, thus increasing the annular trap pressure. In 1999, the production casing of Well A-2 in BP’s Marlin Oilfield in the Gulf of Mexico was crushed several hours after it was put into production; the trap pressure was too high during the drilling of Well Pompano A-31 in the Gulf of Mexico due to the high temperature of the drilling fluid circulation , causing the casing to collapse, causing great safety problems. Therefore, it is of great significance to strengthen the monitoring of annular trap pressure and formulate preventive measures in time for the safe production of offsh...

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Problems solved by technology

[0003] For onshore and shallow water wells, oil-casing annulus trap pressure and casing-casing annulus trap pressure can be measured at the wellhead, while for deepwater wells, subsea wellhead, oil removal-casing annulus trap pressure can be measured. The closure pressure can be measured at the underwater wellhead, but the casing-casing annulus trap pressure cannot be measured, so the purpose of monitoring the annular trap pressure cannot be achieved, which makes the development of offshore oil and gas wells have the risk of wellbore integrity of deep water wells

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