Device for improving physical properties of dense shale oil and gas reservoir, and control method of device

Abstract

The invention discloses a device for improving physical properties of a dense shale oil and gas reservoir, and a control method. The device comprises a down-hole natural frequency detection system, adown-hole control system, an adjustable-speed motor, a vibration sensor, a vibrating rod and a vibrating bar body. The down-hole natural frequency detection system is used to detect the natural frequency of shale. The down-hole control system is connected with the adjustable-speed motor. An output end of the adjustable-speed motor is connected with the vibrating rod. The outer side of the vibrating rod is wrapped with the vibrating bar body. The vibration sensor is arranged on the vibrating bar body and is used to detect the vibration frequency of the vibrating bar body. The down-hole controlsystem has control over the rotating speed of the adjustable-speed motor according to the natural frequency, detected by the down-hole natural frequency detection system, of the shale so as to enablethe vibrating bar body to vibrate according to the natural frequency. According to the device for improving physical properties of the dense shale oil and gas reservoir, an armored cable goes down tothe position of a preset bullet hole in a well, the dense reservoir is induced to resonate by utilizing the resonance principle, new cracks or a large number of microcracks are generated inside the reservoir, then the physical properties of the reservoir are changed, and the recovery ratio of single-well shale gas is increased.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of improving physical properties of shale oil and gas reservoirs, and in particular to a device for improving physical properties of tight shale oil and gas reservoirs and a control method thereof. Background technique [0002] Shale gas refers to the natural gas that mainly exists and is enriched in the adsorbed and free states in organic-rich shale and interlayers. Shale gas does not form traps similar to conventional oil and gas. It has the characteristics of self-generation and self-storage, weather-water interface, large-area low-abundance continuous accumulation, low porosity, and low permeability. There are locally enriched sweet spots, and generally no Natural production or low production, horizontal wells and large-scale hydraulic fracturing are required for economical production. The formation and enrichment of shale gas has its own unique characteristics, and it is often...

AI Technical Summary

Problems solved by technology

[0004] For this reason, the embodiment of the present invention provides a device for improving the physical properties of tight shale oil and gas reservoirs and its control method to solve the problem of how to improve the physical properties of tight shale oil and gas reservoirs in the prior art

Images