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Well having inductively coupled power and signal transmission

A signal unit and wellbore technology, applied in electromechanical devices, drilling equipment, wellbore/well components, etc.

Active Publication Date: 2013-05-01
EQUINOR ENERGY AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Further development of the existing technologies mentioned above is required to allow for the elimination of long cables in the well and possibly the replacement of sensors and other sensing equipment located inside the production tubing

Method used

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  • Well having inductively coupled power and signal transmission
  • Well having inductively coupled power and signal transmission
  • Well having inductively coupled power and signal transmission

Examples

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example

[0028] A 2000m long well transmits 1kW from top to bottom. Experiments have shown that 50% efficiency is practical. Therefore, 2kW must be applied to the main coil. A convenient main coil is about 8m long and consists of 80 identical coils arranged side by side, connected in parallel, each with about 250 0.2mm 2 coils of copper wire. By applying approximately 9.1A of 220V, 50Hz AC to the main coil, 25W will be applied to each of the 80 coils that make up the main coil, and 0.1A will be applied to each of the 80 coils that make up the main coil. The closed circuit of the well, including the production tubing and casing short-circuited at the top and bottom of the well, can be seen as a coil, and therefore if losses are ignored, the voltage and current of the closed circuit are 80 x 220 / 250 = 70.4V, respectively and 9.1 x 250 / 80 = 28.43A. However, losses do exist due to resistive losses in the production tubing and casing, typically around 2 ohms in actual wells. If you use...

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Abstract

Well for production of hydrocarbons, comprising a hole drilled down into an underground, a casing fastened to the hole wall, a production pipe that extends into the casing from the surface and down to a hydrocarbon-containing zone, a hanger on the surface in an upper end of the well, in which hanger the production pipe and casing are hung up and electrically short-circuited, and a packer arranged sealingly and electrically short-circuiting in the annulus between the production pipe and the casing, in or close to a lower end of the well, distinguished in that the well further comprises: a primary coil arranged concentrically about the production pipe, a secondary coil arranged concentrically about the production pipe, a load connected to the secondary coil, and an alternating current generator / signal unit connected to the primary coil.

Description

technical field [0001] This invention relates to signal and power transmission for operating wells producing hydrocarbons. Background technique [0002] When producing hydrocarbons from a well, it is preferable to know the physical parameters about how the well is producing. The physical parameter can be measured at the wellhead, but it is particularly preferred that it can be measured in the well, preferably in the producing zone of the well. [0003] Pressure is of particular interest, as are many other physical parameters, such as temperature, composition and flow rate. Additionally, the primary interest may be to install valves, pumps or other equipment into the well that require power and signals from the surface. [0004] In published patent US 6,644,403 B2 a method and a device for measuring physical parameters in a production well are described. Inside the well, in the annulus between the production tubing and the outer casing, a transformer half is placed in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/02E21B47/12H02K
CPCE21B47/122E21B17/028E21B47/13E21B17/0283
Inventor 比约马尔·斯文尼宁比亚梅·比戈滕
Owner EQUINOR ENERGY AS
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