Device for positioning and detecting accident well on basis of transient electromagnetic method

Abstract

The invention relates to a device for positioning and detecting an accident well on the basis of a transient electromagnetic method. The device comprises a relief well and the accident well, an emitting electrode and a micro inertial measurement unit combination are arranged on a drill collar in the relief well at an interval, the micro inertial measurement unit combination comprises a three-axis flux-gate sensor, a gravity accelerometer and an underground receiving unit, the emitting electrode is connected with a high-power pulse generation circuit through a cable, the micro inertial measurement unit combination is sequentially connected with a ground receiving unit and a high-power power supply through cables, the high-power power supply can provide power for the high-power pulse generation circuit and the ground receiving unit, the emitting electrode receives current signals and generates a primary field, the primary field motivates an accident well sleeve to generate a secondary field, and signals received by the three-axis flux-gate sensor and the gravity accelerometer are transmitted to and processed in the underground receiving unit and are uploaded to the ground receiving unit. The device can be widely used in the processes of rescuing and detecting in the accident well, grade assessing of an accident and formulating of rescue schemes.

Description

technical field [0001] The invention relates to a safety guarantee device for oil exploitation, in particular to a device for locating and detecting accident wells based on transient electromagnetic method, which can be used for rescue detection of accident wells, accident level evaluation and rescue plan formulation. Background technique [0002] In offshore and land drilling, oil and gas wells with blowout accidents are called accident wells. In order to deal with the accident well, it is necessary to drill a directional well connected with the accident well in a safe area near the accident well. This directional well is called a rescue well. In the world's oil drilling, out-of-control blowout accidents often occur. For example, in December 2010, the "Deepwater Horizontal (Deepwater Horizon)" deepwater drilling platform in the Gulf of Mexico triggered a crude oil spill in the Gulf of Mexico that lasted for several months. , causing serious waste of oil resources and marin...

AI Technical Summary

Problems solved by technology

The active detection technology adopted abroad includes the following four situations: 1. The casing of the production well is magnetized to strengthen the magnetic field before going down the well, so as to detect the accident well. This scheme can improve the detection distance and detection azimuth accuracy of magnetic detection. But it's just an aid

2. Install sound sources in production wells in order to detect accident wells. This solution requires additional work for the drilling of each production well. Not only is the process complicated, but the range of acoustic detection is relatively limited

3. During the land drilling process of rescue wells, electromagnetic signals are emitted through the return lines arranged on the ground to detect the relative distance and orientation between the accident well and the rescue well. However, this scheme needs to be operated near the accident well, so it will be limited in application

4. Lift the drill collar during the drilling of the rescue well, detect it with the open-hole logging instrument, and repeat the alternating process of drilling and logging. Among them, the open-hole logging method used is to detect the casing resistance of the accident well The detection distance is 30 meters. This scheme does not use the most advanced resistivity open hole logging means and methods. During the detection process, detection drilling cannot be realized continuously, and the work efficiency is relatively low.

[0005] At present, the existing magnetic detection technology uses time-harmonic electromagnetic signals to detect the distance and azimuth of the accident well. In order to ensure a certain detection distance, the frequency of the signal should not be too high, and the low frequency of the electromagnetic signal will lead to a decrease in detection accuracy.

Therefore, using electromagnetic signals of time-harmonic signals, the accuracy and detection distance of detection azimuth are limited.

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