Mud gun focus drilling rig and combined excitation method for mud gun focus

Abstract

The invention discloses a mud gun focus drilling rig and a combined excitation method for a mud gun focus. The mud gun focus drilling rig includes a hollow drilling rig shell provided with an upper end and a lower end opposite to each other, at least two mud guns arranged in the drilling rig shell and arranged successively along the axial direction of the drilling rid shell. A limiting mechanism used for positioning the mud guns is arranged in the drilling rig shell. The limiting mechanism is provided with a gap. Exhaust holes matching with air exhaust holes of the mud guns are arranged in the drilling rig shell. The mud gun focus drilling rig also includes an air pipe penetrating through the gap and communicating with the mud guns; a cable penetrating the gap and electrically connected with the mud guns. The cable is connected with an electromagnetic valve electrically. According to the invention, multiple mud guns are connected in series axially, so that seismic exploration requirements can be met better and single-point excitation can be realized. Excitation cost is saved and excitation effect is improved.

Description

Technical field [0001] The invention relates to the technical field of geophysical prospecting, in particular to a mud gun seismic source drilling tool and a combined excitation method of the mud gun seismic source. Background technique [0002] At present, land oil exploration mainly uses controllable seismic sources and well explosives as excitation sources. Air gun seismic sources are used as excitation sources in waters with a water depth greater than 3m (meters), while in water-land interaction zones and swamp areas with water depths of 0-1.5 meters, because controllable seismic sources and air gun ships cannot drive and pass, only explosives can be used. The use of explosives as the excitation source requires corresponding drilling rigs, transportation and other equipment, which not only has a high construction cost, but also has the following problems: poor environmental protection and many potential safety hazards. In addition, explosives are not allowed in some areas, r...

AI Technical Summary

Problems solved by technology

The use of explosives as the excitation source requires corresponding drilling rigs, transportation and other equipment, which not only has high construction costs, but also has the following problems: poor environmental protection and many potential safety hazards

But on the whole, this method of arranging multiple excitation points on the plane to form a gun array for excitation requires drilling multiple wells at one shot point, which takes a long time, so the excitation efficiency while drilling is low

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