Design And Implementation Of Hydraulic Fracture Orientation Monitoring System

Today a considerable number of reservoirs in our country are low-permeability ones, in order to augment productivity and optimize production rates, oil extraction is often conducted by fracturing and water injection is carried out on oil-bearing formation to produce artificial fracture, which increases permeability area and facture conductivity.During the hydraulic fracturing construction process, assessing and monitoring artificial fracture geometry and orientation is the key issue in the exploitation of oil fields.Acoustic emission generated by rock crack during oil well fracturing construction causes micro-seismic, which propagates in rock formations around and produces micro-vibration on well tube. Collecting such information to carry on effective processing and analysis could help understand fracture extension direction, provide reasonable basis for determining optimum well spacing and optimizing fracturing designs. This paper describes a method of monitoring hydraulic fractures which uses microseismic technologies, designs DUT-OFCM-II hydraulic fracture orientation monitoring system to realize real-time monitoring.According to the actual application needs this thesis gives the overall system design scheme, including microseismic signal acquisition systems, remote monitoring systems and wireless transmission between the two systems.According to the system functional requirements analysis, selects the appropriate function modules. In terms of hardware design, gives the AT89S52 MCU interface allocation design, the circuit design including signal conditioning, event identification, data storage, serial communication and power supply modules;in terms of software design, introduces the software integrated development environment, how PC application software works, gives the software structure and the primary function block software design such as self-test, initialization, data processing and communications. Finally, tests the fracture monitoring system, test methods and test results are given as well as recommendations for improvement.After the final commissioning, oil well field experiments show that the fracture monitoring system designed meets the technical requirements, and functions pretty well.