A system and method for downhole signal wireless transmission of salt cavern gas storage
A technology of wireless transmission and gas storage, which is applied in the field of downhole measurement and can solve problems such as the difficulty of underground wireless signal transmission.
Active Publication Date: 2021-04-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0009] Aiming at the defects and improvement needs of the prior art, the present invention provides a downhole signal wireless transmission system and method for salt cavern gas storage, the purpose of which is to solve the problem of difficulty in downhole wireless signal transmission in an environment where high and low impedance coexist
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0034] Such as figure 1 As shown, the present invention provides a downhole signal wireless transmission system of a salt cavern gas storage, the system includes: a downhole detection device, which is installed on the outer wall of the center pipe located in the cavity, and is used to convert the detected data into The electrical signal is then transmitted to the repeater with the central tube ...
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The invention discloses an underground signal wireless transmission system and method of a salt cavern gas storage, belonging to the technical field of underground measurement. Including: the downhole detection device, which is installed on the outer wall of the central tube in the cavity, and is used to convert the detected data into electrical signals and transmit them to the repeater with the central tube as a carrier; the repeater, which is installed on the casing The outer wall of the central tube inside the tube is used for impedance transformation to adapt the electrical signal to the low-impedance environment at the central tube of the casing part where the repeater is located, and transmits the electrical signal to the uphole detection device with the central tube as a carrier. In the downhole part with high impedance and low conductivity, the present invention uses the central pipe in the cavity for wireless transmission of electrical signals, and in the casing part with low impedance and high conductivity, the coil of the repeater is used for impedance conversion. The impedance of the center pipe will be adjusted high, so that the electrical signal can be transmitted wirelessly smoothly; using one or more repeaters can realize the long-distance transmission of the signal downhole.
Description
technical field [0001] The invention belongs to the technical field of downhole measurement, and more specifically relates to a downhole signal wireless transmission system and method for a salt cavern gas storage. Background technique [0002] The salt cavern gas storage is built by injecting fresh water into the salt mine as a dissolved cavity for gas storage. Dissolution, the brine is discharged from the drainage pipe, and the spacer liquid is injected into the gap between the water injection pipe and the casing to avoid the top dissolution; during the above period, the parameters are constantly adjusted according to the technical parameters such as the brine salinity, and the geometry and volume of the underground cavity are controlled. Finally, a gas storage that meets the design requirements is obtained. Gas storages are often located thousands of meters underground, so real-time transmission of downhole data is conducive to timely and accurate evaluation of downhole ...
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IPC IPC(8): E21F17/18E21F17/16
CPCE21F17/16E21F17/18
Inventor 刘昶陈庆叶才勇杨思谛余沐阳胡皓然欧阳宇伦饶波徐争光
Owner HUAZHONG UNIV OF SCI & TECH