A device and method for detecting drilling fluid gas in a riser

Abstract

The invention relates to a drilling fluid gas detection device and method in a riser. The device comprises a plurality of gas sensing devices, a front-end processor, a signal amplifier and a signal analysis device. The sidewall of the riser is provided with a plurality of through holes. , the gas sensing device is installed at the through hole; the gas information collected by the gas sensing device is transmitted to the signal analysis device through the front-end processor and the signal amplifier, and the signal analysis device accepts the gas transmitted by the signal amplifier information and analyze it. In the present invention, the semi-permeable membrane and the sensor are placed in the wall of the riser. Due to the selective permeability of the semi-permeable membrane, the gas in the riser will pass through the semi-permeable membrane and be captured by the sensor, so as to realize the drilling operation in the riser. The purpose of liquid gas detection is to detect gas intrusion and well kick in advance, improve the safety during drilling, and avoid the occurrence of complex accidents such as well blowout.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to a drilling fluid gas detection device and method in a riser. Background technique [0002] Offshore drilling is a high-risk and high-investment industry, and any small accident will bring huge property losses. In offshore drilling, the length of the blowout accident occurs, in addition to management reasons, the main reason is the monitoring method for gas intrusion Poor, once the blowout occurs, the consequences are difficult to control. In drilling, the normal drilling process is that the drilling fluid is pumped into the bottom hole through the mud pump through the drill pipe, and then returned to the surface through the annulus. The pressure generated by the static column pressure and the circulation friction can balance the formation pressure and prevent the gas in the formation. wellbore. After gas invasion occurs, the bottom hole pressure will drop, the p...

AI Technical Summary

Problems solved by technology

The above technologies have been successfully applied in their respective fields, but there are still deficiencies in the quantitative monitoring of gas intrusion. For example, the effect of using polydimethylsiloxane as a semipermeable membrane for oil and gas separation under high temperature conditions is poor; The Le measurement technology cannot meet the requirements in low gas transgression monitoring; the real-time data of the bottom hole pressure sensor is limited by the downhole transmission technology, and real-time data transmission cannot be achieved

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