| With the increasing complexity of oil and gas exploration environment,intelligent stratified oil production technology solves the contradiction between reservoirs in high water cut stage.In the intelligent stratified production system,each well has multiple production zones that need to be exploited,and only by unified management of state parameters of each production zone and production parameters of multiple Wells,can the optimal combination of multiple Wells and multiple reservoirs be exploited and the dynamic real-time monitoring of downhole reservoirs be realized.Based on the analysis of the domestic and foreign intelligent stratified oil production technology and its monitoring system,this paper mainly focuses on the transmission and communication technology of multi-well and multi-reservoir in stratified oil production,in order to realize the efficient management of downhole oil reservoirs and adapt to the intelligent development trend of oil fields.The research contents of this paper mainly include the following aspects:Firstly,the demand and overall function of intelligent stratified oil production system are analyzed,and the power line carrier communication mode is selected.In view of the reliability problem of signal transmission between ground and downhole,channel simulation of 6000 m single core cable is carried out in Multisim14.0,transmission characteristics and signal coupling mode of single core cable of different lengths are analyzed and studied,which provides an important reference for signal processing module of hardware circuit in downhole communication sub.On this basis,a multi-well multi-reservoir transmission system model is established,and the reliability and stability of the transmission model are verified by analytic hierarchy process and genetic algorithm.Secondly,by comparing the characteristics of several common coding methods and the analysis and comparison of the applicable occasions,combined with the distribution characteristics of intelligent Wells,Manchester code is selected to complete the encoding and decoding of the data transmission system.The hardware and software design of the downhole communication sub and the surface monitoring center is completed.The two-way communication and power supply between the surface monitoring center and each reservoir acquisition module is realized through a single core cable.The communication protocol of the layered oil production transmission system is designed,and the RTU mode of the standard MODBUS protocol is adopted in the protocol layer to reduce the bit error rate.In addition,the upper computer real-time monitoring software is designed using Lab VIEW2018 software,and the measurement data is sent to the mobile terminal through the cloud server,and the We Chat developer tool is used to complete the design of the client We Chat small program,which enriches the diversity of data monitoring methods.Finally,the designed stratified oil production transmission system was simulated by Proteus,and the software and hardware functions of the transmission system were tested in the laboratory by simulating the downhole environment,which verified the feasibility and rationality of the multi-well multi-reservoir transmission system for stratified oil production. |
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