Underground gas cut intelligent control system

Abstract

The invention relates to the field of underground gas cut monitoring and control, in particular to an underground gas cut intelligent control system which comprises a control assembly microcomputer, acontrol assembly storage battery, a signal receiver, a bypass electromagnetic valve, a signal projector, a monitoring assembly storage battery, a monitoring assembly microcomputer, a rotational viscometer, an electrical resistivity measuring positive electrode, an electrical resistivity measuring negative electrode, a packer and the like, wherein the control assembly microcomputer, the control assembly storage battery, the signal receiver, the signal projector, the monitoring assembly storage battery and the monitoring assembly microcomputer are mounted in mounting holes of a well drilling shaft bottom pipe column; the rotational viscometer, the electrical resistivity measuring positive electrode, the electrical resistivity measuring negative electrode and the packer are mounted in a dedicated mounting space of the outer wall of the well drilling shaft bottom pipe column; variation of viscosity and electrical resistivity of the drilling fluid are detected to judge whether the gas cutoccurs or not; the packer is utilized to temporarily seal and separate gas cut drilling fluid; and the bypass electromagnetic valve is utilized to reach communication between the well drilling shaft bottom pipe column and the annular space to conveniently replace the drilling fluid so as to avoid the blowout accident.

Description

Technical field [0001] The invention relates to the field of downhole gas intrusion monitoring and control engineering, and more specifically to a downhole gas intrusion intelligent control system. Background technique [0002] In the process of drilling oil and gas wells, the circulation flow of drilling fluid: from the drill pipe to the ground, and then flow to the ground through the annular space between the drill pipe and the well wall (casing). When the fluid contained in the formation being drilled intrudes into the drilling fluid in the wellbore, and the amount of intrusion is large, overflow, blowout, blowout and even major catastrophic accidents will occur. Catastrophic accidents include borehole scrapping, blowout fire, and drilling rig Burial, even casualties and other consequences, so preventing formation fluids from entering the wellbore is of great significance. Gas is a kind of underground fluid. Gas invasion of drilling fluid (abbreviated as gas invasion) is one ...

AI Technical Summary

Problems solved by technology

This process takes a long time from the discovery of gas invasion to the taking of measures, which delays the well killing operation and is very likely to lead to greater catastrophic accidents, and the prediction of gas invasion is not accurate enough, and manual operation is labor-intensive and inefficient

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