Ground shallow-embedded micro seismic monitoring node device

Abstract

The present invention provides a ground shallow-embedded micro seismic monitoring node device. The device comprises a node host, an external port, a collection detector, a collection protection device, a shallow-embedded rope and a GPS antenna; the node host is connected with the collection detector and the GPS antenna; the collection detector includes a series coil, a metal sheath and a metal drill bit; the metal sheath and the metal drill bit area wrapped around the series coil; and the shallow-embedded rope is fixed at the top end of the metal sheath. The ground shallow-embedded micro seismic monitoring node device is embedded below a low velocity layer to avoid earth surface noise disturbance and the complex near-surface severe absorption attenuation effect and realize the dynamic monitoring of the induced fractures in the unconventional oil and gas reservoir hydrofracture process so as to provide the reference base for the transformation of the reservoir fracture, and therefore the ground shallow-embedded micro seismic monitoring node device can be better applied to the unconventional oil and gas reservoir fine exploration and development.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploration and development, in particular to a ground shallow-buried micro-seismic monitoring node device. Background technique [0002] Unconventional oil and gas resources are widely distributed and have long-term stable production capacity. They are the future replacement energy positions. However, unconventional oil and gas reservoirs have physical characteristics of low porosity and low permeability, which makes unconventional oil and gas resources unable to be effectively exploited. Hydraulic fracturing of tight reservoirs can effectively increase oil and gas productivity. Microseismic monitoring technology can effectively monitor the fracturing status of reservoirs, evaluate the effect of hydraulic fracturing, and provide guidance for the efficient exploration and development of unconventional oil and gas reservoirs. [0003] Microseismic monitoring mainly includes surface micro...

AI Technical Summary

Problems solved by technology

Conventional ground microseismic monitoring devices are deployed on the surface, and there is a lot of surface noise interference, which seriously affects the quality of microseismic monitoring data

In addition, the surface contains a low-velocity layer and a velocity-reducing layer. The propagation velocity of the low-velocity layer is low, and the low-velocity layer has a strong absorption and attenuation effect on seismic waves. The seismic waves generated by hydraulic fracturing propagate upward from the fracturing section. In the low-velocity layer and deceleration layer, the energy and effective frequency band of the seismic wave are severely attenuated, which makes the signal-to-noise ratio of the micro-seismic data monitored on the ground extremely low, which seriously affects the accuracy of micro-seismic monitoring

Shallow well microseismic needs to drill multiple monitoring wells hundreds of meters deep in the monitoring well area, the drilling cost is high, and it is time-consuming and laborious

In-well microseismic requires at least one monitoring well, and the requirements for monitoring wells are high, and monitoring costs are expensive

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