A data transmission device and method for downhole communication

Abstract

The invention provides a device and a method for data transmission during underground integrated communication, and belongs to the field of petrochemical industry. According to the invention, triggering and information transmission of a PLC (Programmable Logic Controller) are achieved by using an RFID (Radio Frequency Identification Device) technology. An RFID reader / writer is embedded under an oil well; and double-way control and data communication between the RFID reader / writer and a valve control PLC are achieved; when the PLC is required to execute an action, an RFID passive electronic label containing an operating instruction is put from a wellhead; and when the RFID passive electronic label passes through the RFID reader / writer, the RFID reader / writer is used for reading the operating instruction and transmitting the operating instruction to the PLC to execute corresponding operation, so as to operate an underground intelligent water distributor. Through the adoption of the data transmission device and method provided by the invention, cable investment can be greatly saved, the reliability is greatly enhanced and long-time continuous working is guaranteed because an energy saving mode is obtained; according to the invention, false actions can be avoided through the adoption of multiple safety measures; according to the invention, through customizing and packaging, the used electronic label can be used for bearing severe underground working environments; and according to the invention, history data local storage and post analysis functions are supported; and according to the invention, the accuracy and reliability are enhanced when the labor cost is reduced.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a data transmission device and method for downhole communication, which is used for communication data transmission under special working conditions downhole. Background technique [0002] The control of objects such as valves at the bottom of oil drilling has always been a technical problem in oil drilling. Traditional methods include: throwing metal balls, controlling hydraulic pressure and pulses and other mechanical triggering methods, and laying cables and sonar to trigger PLC to realize actions, so as to realize the control of valve objects. [0003] In the prior art, the patent No. 200410061228 discloses a method of regulating layered water injection with pressure waves, which is based on the number of layers that need to be distributed by the water injection well, in a group of pressure-controlled water distributors that can receive ground pressure signal...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patent uses a high-pressure pump as a pressure source at the wellhead, so that the pressure-controlled water distributor on the water volume section can send out a pressure coded signal corresponding to its action. This method requires the use of high-pressure pump equipment, which is expensive and manually controlled. The time precision of the pulse is low, and the operation is time-consuming. Its main disadvantages are as follows:

[0005] (1) When the formation absorbs water seriously, it is difficult to produce a significant pressure difference with a high-pressure pump, which has a greater impact on the effect of generating pressure waves;

[0006] (2) When the high-pressure pump completes a cycle of pressure pulses, it needs to stop the pump and then start the high-pressure pump again. This operation consumes a lot of energy and takes a long time;

[0007] (3) The stability of boosting by using a high-pressure pump is not enough, and the cost is high

However, due to the harsh underwater environment, it is difficult to use photoelectric detection and other limit switches, and it is impossible to transmit information and instructions to the PLC

Using wired cables, due to the harsh working environment in the well (temperature: maximum 125 degrees, minimum ten degrees; pressure: 60MPa; corrosiveness: saturated salt water), not only the cost of long-distance cable transmission is high, but also the durability and reliability of work. Reliability is difficult to guarantee

All in all, no matter which of the above methods is used, there are disadvantages such as expensive, easy to corrode, and inflexible control in harsh environments such as high temperature and high pressure corrosion.

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