Current signal emission source down-hole three-electrode system

Abstract

The invention belongs to the technical field of underground resource drilling engineering, and particularly relates to a current signal emission source down-hole three-electrode system which comprises an upper halter, a lower halter, an electrode system outer shell, an electrode pushing and supporting mechanism and an electrode conduction unit. The current signal emission source down-hole three-electrode system is characterized in that the upper halter and the lower halter seal the upper end and the lower end of the electrode system outer shell respectively, and the electrode pushing and supporting mechanism is arranged in the electrode system outer shell and pushes the electrode conduction unit to be opened and closed. The current signal emission source down-hole three-electrode system can effectively increase the magnitude of currents which are injected to a ground layer through a signal emission source, low-frequency alternating currents collected on an sleeve pipe of an accident well are further increased, so that a relatively-large low-frequency alternating magnetic field generated through the low-frequency alternating currents collected on the sleeve pipe of the accident well can be detected through an exploring tube in a relief well, the distance measuring range of a relief well and accident well communication detection system is easily enlarged, and the current signal emission source down-hole three-electrode system is better suitable for deep well communication directional drilling engineering.

Description

technical field [0001] The invention belongs to the technical field of underground resources drilling and production engineering, and in particular relates to an underground three-electrode system for a current signal emission source used in a rescue well and accident well connection detection system. Background technique [0002] In recent years, the frequent occurrence of oil spill accidents on offshore drilling platforms has caused serious ecological disasters and extremely bad social impacts. Rescue wells are often used to deal with accidents when oil and gas wells catch fire or blowout accidents in offshore and land drilling. The trajectories converge at a certain layer of the formation, and high-density drilling fluid or cement is injected into the accident well through the rescue well to achieve the purpose of extinguishing the fire of the oil (gas) well or subduing the blowout. On April 20, 2010, the blowout of well MC252#1 in the Gulf of Mexico led to a months-long...

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Problems solved by technology

On April 20, 2010, the blowout of well MC252#1 in the Gulf of Mexico led to a months-long deep-sea drilling oil leak, which not only caused huge economic losses to BP, but also caused serious ecological disasters and social impacts

[0004] Wellspot guiding tool is an efficient tool for controlling the connection between rescue wells and accident wells. At present, the core technology of Wellspot guiding tools designed abroad is still kept secret and monopolized, and there is still a lack of in-depth research in this area in our country

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