A hydraulic fracturing microseismic monitoring device and monitoring method

Abstract

The invention discloses a hydrofracture and micro-seismic monitoring device and a hydrofracture and micro-seismic monitoring method. The monitoring device comprises a plurality of micro-seismic monitoring sensors and a micro-seismic monitoring system, wherein the plurality of micro-seismic monitoring sensors are respectively distributed on shafts installed in a plurality of monitoring wells, and each shaft is composed of a ground exposed section and an underground embedded section; the micro-seismic monitoring sensors are distributed on the outer side walls of the ground exposed sections, the inner ends of the micro-seismic monitoring sensors are provided with connectors, and the outer ends of the connectors are tightly adhered to the outer side walls of the ground exposed sections and fixed to the ground exposed sections through anchoring agents; the monitoring method comprises the steps of: 1, selection of the monitoring wells; 2, installation of the micro-seismic monitoring sensors; 3, wiring of the micro-seismic monitoring sensors; 4, monitoring of hydrofracture and micro-seism. The monitoring device is reasonable in design, convenient to implement, good in use effect and high in monitoring accuracy, and can effectively solve the problems that the micro-seismic monitoring sensor is complex in installation method, high in installation cost, not strong in flexibility, large in signal transmission attenuation, easy to drop, poor in monitoring effect and the like.

Description

technical field [0001] The invention belongs to the technical field of microseismic monitoring, and in particular relates to a hydraulic fracturing microseismic monitoring device and a monitoring method. Background technique [0002] Hydraulic fracturing technology was first used in the development of oil and gas fields to increase the production of oil and gas wells. Hydraulic fracturing is an oil and gas well stimulation measure with wide application prospects. Hydraulic fracturing uses high-pressure pumps on the surface and squeezes fracturing fluid with high viscosity into the oil layer through the wellbore. When the absorption capacity is high, a very high pressure is formed on the oil layer at the bottom of the well. When this pressure exceeds the fracture pressure of the rock in the oil layer near the bottom of the well, the oil layer will be pushed open and cracks will be generated. In the 1960s, the former Soviet Union introduced this technology into coal mines as ...

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Problems solved by technology

[0005] However, since the microseismic monitoring sensors used in the existing microseismic monitoring system are all installed underground, the following problems exist in the actual use process: first, the microseismic monitoring sensors are difficult to install, the installation method is complicated, time-consuming and laborious, and the installation cost is high; 1. The installation quality is difficult to guarantee, and the installed sensors are easy to fall off, which affects the normal monitoring process of the microseismic monitoring system; third, the flexibility is poor. Once the sensor is installed, it is difficult to adjust the installation position. The installation position is inconvenient to adjust and other problems; Fourth, the microseismic monitoring sensor is located below the ground, and a long-distance signal transmission system is required for signal transmission, and the signal transmission attenuation is large, thus affecting the monitoring accuracy

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