VSP optical cable descending device, oil and gas exploration system and descending method

Abstract

The invention discloses a VSP optical cable well descending device, an oil-gas exploration system and a descending method, and belongs to the technical field of oil-gas exploration. An oil and gas exploration system comprises an optical fiber geophone, a vibroseis and a VSP optical cable descending device. The VSP optical cable descending device comprises a well casing filled with water, an optical cable, a long-strip flexible traction object and an air pipe, the optical cable is suspended in the well pipe; one end of the long-strip-shaped flexible traction object is connected with the bottomend of the optical cable, and the other end of the long-strip-shaped flexible traction object makes contact with the bottom wall of the well casing. The air pipe is arranged on the outer side wall ofthe optical cable along the extending direction of the optical cable; the air inlet end of the air pipe communicates with the air pump; a plurality of air bags are arranged on the side wall of the airpipe at intervals and communicated with the air pipe. According to the invention, the problem of excessive deformation of the optical cable can be avoided, and the quality of seismic signals detectedby a distributed optical fiber seismic wave sensing system (DAS) can be improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a VSP optical cable downhole device, an oil and gas exploration system and a downhole method. Background technique [0002] Oil is an important strategic material. With the rapid development of China's economy, my country's consumption of oil is increasing. Increasing exploration and development efforts, developing new technologies, reducing traditional exploration costs, and increasing oil production are all important directions for future energy exploration. Seismic methods are the cornerstone of underground exploration and the main method of domestic oil and gas exploration. Compared with surface seismic surveys, downhole VSP experiments can help us obtain more details of rock properties and potential fluid paths in geothermal reservoirs. That is to use artificial methods to send strong low-frequency seismic waves to the stratum. The seismic waves encounter di...

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Problems solved by technology

[0007] The object of the present invention is to provide a VSP optical cable downhole device, an oil and gas exploration system and a downhole method to solve the problem that the existing optical cable will be deformed or broken during the lowering process, and the quality of the seismic wave signal detected by the optical cable is poor The problem

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