Novel cable-free type data bidirectional transmission device for water injection well

Abstract

The invention discloses a novel cable-free type data bidirectional transmission device for a water injection well, capable of realizing a function of bidirectional transmission of data, including a flow and a pressure, from a well mouth of the water injection well to an underground injection layer and from the underground injection layer to the well mouth and adopting time sequence waves for coding. The device comprises an upper joint, an outer protective pipe, a pressure control short section, a water nozzle short section, a circuit control short section, a middle joint and a lower joint; theupper joint and the lower joint are connected with the outer protective pipe through threads; the outer protective pipe is internally provided with the pressure control short section, the water nozzle short section and the circuit control short section; the circuit control short section is internally provided with a flow sensor, a pressure sensor, a battery assembly and a logic control operationcircuit; and injected water enters the stratum after passing through a rapid opening / closing valve and the water nozzle short section. Time sequence pressure waves are decided by signal coding, a decimal system is adopted, timing is started when a signal is changed to a low level, and the signal represents a number N if becoming into a high level after N time units. For the novel cable-free type data bidirectional transmission device for the water injection well, on one aspect, data non-contact bidirectional transmission is realized; and on the other hand, coding is performed by adopting a form of the time sequence waves, and by combining with a design mode of the rapid opening / closing valve, the coding, decoding and transmitting efficiencies of the pressure waves can be greatly improved.

Description

technical field [0001] The invention relates to the field of layered water injection technology for oilfield water injection wells, and in particular to an electromechanical integrated tool with the ultimate goal of controlling the water injection volume, which can realize two-way transmission of flow, pressure and other data functions from the surface wellhead to the downhole, and from the underground to the surface wellhead. Background technique [0002] In order to improve the economic benefits of oil field development and maximize the oil recovery rate, layered water flooding is often used in oil field development to supplement the capacity of the reservoir, injecting water into the well, so as to produce more oil at the production end of the oil well. At present, there are many layered water injection techniques and tools in the oil field, including the method of using steel wire / cable to obtain downhole flow data, and the method of using pressure change to load informat...

AI Technical Summary

Problems solved by technology

However, the aforementioned layered water injection tools face the following problems: the former uses ground equipment to lower the instrument into the well, which increases the operating cost and needs to occupy a limited operating site, especially bringing a greater load to offshore platform construction; the latter mentioned The water injection tool does not have the function of transmitting data from downhole to the surface wellhead, and the transmission efficiency is low

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