Underground separated layer water injection control system based on RFID (radio frequency identification device)

Abstract

The invention relates to an underground separated layer water injection control system based on a RFID (radio frequency identification device). The system comprises a computer, a radio frequency card writing chip, a radio frequency card and a water distributor, wherein the computer and the radio frequency card writing chip are connected through a URAT (universal asynchronous receiver transmitter) serial line; and when in construction, the radio frequency card and the radio frequency card writing chip are connected through wireless communication. The system provided by the invention also has the advantages that: the radio frequency card is very small and can smoothly drop in an oil pipe without blocking the oil pipe; and the radio frequency card is provided with a plastic protection layer to buffer impact. In the invention, the special water distributor is provided with a valve control circuit and a corresponding valve transmission mechanism; the mounting structure is compact, the strength of the water distributor is not influenced, and butt joint with a standard oil pipe is convenient; and the system is suitable for the small space in an oil well, and an oil well pipeline does not need to be modified. The sleeve and a sealing rubber ring of the special water distributor can effectively protect the valve control circuit and the corresponding valve transmission mechanism from interference of factors such as underground pressure, humidity and the like.

Description

technical field [0001] The invention relates to the technical field of energy mining equipment, in particular to an RFID-based downhole layered water injection control system. Background technique [0002] When the oil field enters the stage of water injection development, in order to ensure that the pressure of the oil field will displace the oil, it is necessary to inject water into the formation, that is, water injection oil recovery technology. Wells that inject water are called injection wells. Most oil fields in my country are layered reservoirs, and the oil layers are an independent and closed oil storage body. There are differences in the structure, composition, pressure, temperature, thickness, etc. of each oil layer: some oil layers are loose in texture, and the pores are large and numerous. , strong oil storage capacity; some oil reservoirs are dense in texture, with few and small pores, and relatively weak oil storage capacity. The existence of this difference m...

AI Technical Summary

Problems solved by technology

The use of cables or hydraulic lines to control has the problems of cumbersome operation of downhole tools and complex mechanical structures. When controlling oil wells with more than 3 oil layers, there are too many hydraulic lines, complicated installation, low reliability, and difficult control.

Although optical fiber sensing technology has the advantages of long communication distance, no signal attenuation, high data reliability, no need for downhole signal processing circuits, and greatly simplified system structure, etc., due to the high brittleness of optical fibers, especially downhole tools are frequently operated and the vibration is relatively large. It is easy to cause the optical fiber to break under the condition of the optical fiber. In addition, when the optical fiber passes through the packer, an additional optical fiber protection device is required, which greatly increases the complexity and cost of the mechanical structure and reduces the reliability of the downhole tool.

Although the pressure coding technology can realize the transmission of surface and downhole information, due to the lengthy pressure coding of the system, it takes a long time to successfully type a set of pressure codes, and it is difficult to apply and operate in actual wells on site

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