The Study Of Oil Well Fracturing Crack Location Based On Microseismic Monitoring Method

With the process of oil exploration,the natural capacity of oil wells will be reduced,and the fracturing technology is an important measure of oil production.Microseismic monitoring technology is a kind of new technology,which can monitor underground stress field changes caused by the fracturing,water injection and other petroleum engineering work resulting in rock fracture microseismic signal,the signal containing the source and its nearby rock fracture state information.The aim of micro seismic monitoring research is to identify the effective signals from the signals and extract the effective information as much as possible,show up the effective information of the focal point by digital image processing software,and describe crack size,angle,extension direction and extension length.The results of the micro seismic imaging can directly guide fracturing engineering operation,adjust the fracturing parameters in time,and track and locate the range,the size and the development direction of crack.The selection of fracturing parameters and source parameters can determine reservoir by maximum and minimum horizontal stress direction and stress historical maximum,objective evaluation of the effect of fracturing engineering can provide intuitive and effective instruction on the production and development of the next step,reduce development costs.It outlines the current development situation in the microseismic monitoring technology at home and abroad in this paper,discusses the basic principles of microseismic monitoring technology,analyzes the microseismic monitoring methods and source location method;Secondly,the monitoring instrument,data acquisition and processing procedure are introduced in this paper,and studies and analyzes the basic theory and method used in the experimental data processing combined with experimental data;At last,combining the example of crack location of oil well fracturing,fracturing results are mapping,and assess the accuracy,verify the theoretical and technical methods.It has some guidance for fracturing engineering in future.The research result of this paper solves the problem of fracture location in oil well fracturing,and proves the feasibility and reliability of the method with a living example.This method not only has important effect in the transformation of low permeability oil field,but also has broad application prospect and practical value in unconventional oil gas exploration and development.