New method for controlling up-down integrated well control safety in deep water well drilling and completion

Abstract

The invention relates to a new method for controlling up-down integrated well control safety in deep water well drilling and completion. The new method comprises the following steps that S1, a while-drilling temperature and pressure sensor is mounted at the position close to a drill bit and used for detecting the temperature and pressure of the position near the drill bit during well drilling; S2,a downhole blowout preventer is mounted at a lower well section in a wellbore so that the downhole blowout preventer can control high-pressure overflow at the lower well section in the wellbore for the first time; S3, a signal of the temperature and pressure sensor, a signal of the downhole blowout preventer and a signal of a submarine blowout preventer are connected in a wireless transmission mode, the wireless signals are transmitted to a well drilling platform, and whether the submarine blowout preventer needs to be shut down or not is judged by a worker on the platform; and S4, the well drilling platform conducts well drilling operation, after the drill bit drills to high-pressure gas, the sensor detects a high-pressure signal, the downhole blowout preventer is shut down, meanwhile, the a signal is transmitted to the offshore well drilling platform, whether the submarine blowout preventer needs to be shut down or not is judged by the worker on the platform according to the obtained signal, and thus two-stage blowout prevention is achieved.

Description

technical field [0001] The invention relates to the technical fields of marine drilling technology and oil and natural gas exploitation, and is a new safety control method for integrated well control of upper and lower wells in deep water drilling and completion. Background technique [0002] Blowout is a phenomenon in which the pressure of formation fluid (oil, natural gas, water, etc.) is greater than the pressure in the well during the drilling process, and a large amount of it pours into the wellbore and ejects uncontrollably from the wellhead. The blowout accident is the casualty and property loss caused by the huge pressure and shock wave during the eruption. Blowout accident is a very harmful drilling accident. Once it occurs, it often has serious consequences, and strict preventive measures must be taken. When a blowout occurs, the main well must be closed quickly and accurately to control the wellhead to prevent blowout accidents. [0003] The existing offshore dr...

AI Technical Summary

Problems solved by technology

This conventional blowout prevention method has certain limitations. Once the single-stage blowout preventer fails to work normally, the overflow fluid will flow directly from the wellhead on the seabed, causing serious marine environmental pollution.

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