Method for monitoring oil well fracturing microseismic ground-borehole crack

A microseismic and surface technology, applied in the field of oil well fracturing microseismic surface-well fracture monitoring, can solve the problems of difficult monitoring, high cost, and inability to meet deep well fracturing fracture monitoring

Inactive Publication Date: 2010-09-15
长春锐利科技有限公司
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Problems solved by technology

[0003] The invention monitors the stratum disturbance (microseismic) generated by fracture formation in fracturing, and effectively s

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  • Method for monitoring oil well fracturing microseismic ground-borehole crack
  • Method for monitoring oil well fracturing microseismic ground-borehole crack
  • Method for monitoring oil well fracturing microseismic ground-borehole crack

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Embodiment Construction

[0007] Firstly, five ground vibration pickups (2, 3, 4, 5, 6) should be distributed radially around the fracturing well 1, and a monitoring well 7 should be found within 600m around the fracturing well 1, and the fracturing monitoring and The three-core cable 8 on the command vehicle is connected with the vibration pickup 10 in the well, and then the vibration pickup 10 in the well is put into the 1 / 2 depth of the fracturing well 1 fracturing layer. The vibration pickup 10 in the well adopts the most advanced acceleration sensor in the world as the front-end acquisition unit, and the minimum measurement accuracy is 10 -5 m / s 2 , which meets the requirements for measuring microseismic signals. There is a main control station of this system on the fracturing monitoring and command vehicle. The main control station adopts an industrial computer, runs WINDOWSXP operating system, and is connected with the main control station through a network interface through an adapter. The mai...

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Abstract

The invention designs a method for monitoring an oil well fracturing microseismic ground-borehole crack, which is characterized by comprising the following steps of: receiving microseismic waves by monitoring substations arranged at the circumference of a wellhead by utilizing the propagation characteristic of an elastic wave field in a stratum medium, forming a series of equation sets according to the arrival time difference of the microseismic waves of each substation, and solving the series of equation sets to determine the position of a microseismic source and further determine stratum parameters of crack distribution, such as the azimuth, the length, the height, the ground stress direction and the like. The background noise in a well is small, filtration processing is carried out on a ground observation signal through an underground observation signal, fracturing microseismic signals and ground interferences are screened and distinguished, a detector placed in the well is a reference value of a whole set of system collected signals, the signal collected by a ground seismometer is identified by people through the reference value to filter an interference signal, so that a monitored result of the people can be more true and reliable.

Description

technical field [0001] The invention relates to a microseismic monitoring method for fracturing fractures, in particular to a microseismic surface-in-well fracture monitoring method for oil well fracturing. Background technique [0002] At present, conventional methods for fracture monitoring using microseismic fracturing are divided into two categories: well monitoring and surface monitoring. The cost of observation equipment in this method of well monitoring is too high, and the implementation conditions are too harsh. It is required to find three "monitoring wells" within a range of 600 meters. The synchronization problem of large and micro-seismic information acquisition leads to low reliability of observation data, and it is difficult to accurately determine the observation point. Contents of the invention [0003] The invention carries out monitoring based on formation disturbance (microseismic) generated by fracture formation in fracturing, and effectively solves t...

Claims

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Application Information

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IPC IPC(8): G01V1/40
Inventor 王建平叶震刘勇林君陈祖斌曾晓献张林行孙峰
Owner 长春锐利科技有限公司
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