Wireless measurement and control separate injection pipe column of water injection well

Abstract

The invention provides a wireless measurement and control separate injection pipe column of a water injection well, comprising a underground pressure pulse transmitting-receiving device, a plurality of flow measurement and control devices, a plurality of cable crossing packers and an oil pipe; a plurality of flow measurement and control devices are sealed in different water injection layers by a plurality of cable crossing packers; the underground pressure pulse transmitting-receiving device is located at the upper end of a tool section; a pressure signal received from the ground is convertedto an electrical signal and transmitted to a plurality of flow measurement and control devices so as to control the work of a plurality of flow measurement and control devices; injected water enters the oil pipe and flows downwards to the flow measurement and control devices in each water injection layer; and the water injection rate of each water injection layer can be measured by the flow measurement and control devices. The wireless measurement and control separate injection pipe column of the water injection well can meet the requirements of real-time adjustment and frequent measurement and adjustment of an injection scheme during a three-dimensional development process of an oil deposit, improve the technological level of an intelligent injection process and fill the blank of wirelesstwo-way signal transmission in the water injection field.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a wireless measurement and control distribution injection pipe string for water injection wells. Background technique [0002] Layered water injection wells in oilfields are regularly tested in layers to understand the water absorption status of each separate injection layer, and at the same time adjust the water volume of the water injection layer that cannot meet the injection requirements to meet the injection requirements. Currently, the test and adjustment process of separate injection wells includes steel wire carrying test instruments After the downhole data is collected and stored, the ground is played back and read, and the water nozzle is used to adjust the water volume; the communication cable carries the measurement and adjustment integrated instrument to go down the well layer by layer to test and adjust the water volume, and the ground can directly read...

AI Technical Summary

Problems solved by technology

[0002] Layered water injection wells in oilfields are regularly tested in layers to understand the water absorption status of each separate injection layer, and at the same time adjust the water volume of the water injection layer that cannot meet the injection requirements to meet the injection requirements. Currently, the test and adjustment process of separate injection wells includes steel wire carrying test instruments After the downhole data is collected and stored, the ground is played back and read, and the water nozzle is used to adjust the water volume; the communication cable carries the measurement and adjustment integrated instrument to go down the well layer by layer to test and adjust the water volume, and the ground can directly read the data during the measurement and adjustment; The development of electronic information integration technology has also carried out technical tests such as permanent underground real-time transmission of cables, wireless transmission of acoustic waves, wireless transmission of electromagnetic wave signals, and wireless transmission of one-way pressure pulse control to promote the development of information-based intelligent water injection technology, but there are the following problems : 1) It is difficult to run the measuring and adjusting instruments in directional wells and highly deviated wells, and it is impossible to implement effective injection; 2) The communication cable is easy to bump when it goes downhole with the tubing, causing corrosion and breakage, which affects the life of the tubing string; 3) The existing wireless transmission The method has serious signal attenuation and short transmission distance, and can only realize one-way signal transmission from the ground to the downhole, and cannot wirelessly return the downhole signal, and needs to be lowered into the instrument for collection, and it cannot be implemented in inclined wells

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