Downhole electric heating horizontal production well string structure

Abstract

The embodiment of the invention provides a downhole electric heating horizontal production well string structure. The string structure comprises a casing pipe, a horizontal liner pipe and oil pipes located in a cavity formed by the casing pipe and the horizontal liner pipe in a defined mode, the oil pipes include the first metal oil pipe and the second metal oil pipe which are used for forming an electromagnetic wave energy transmission channel, the first metal oil pipe is sleeved with the second metal oil pipe, and the cavity between the second metal oil pipe and the first metal oil pipe is filled with an insulating material; the casing pipe and the horizontal liner pipe are insulated and isolated, the horizontal liner pipe is horizontally divided into two parts which are insulated and isolated to serve as two arms of a radio frequency antenna, and the first metal oil pipe and the second metal oil pipe are correspondingly coupled with the two arms of the radio frequency antenna respectively. The structure further comprises a continuous oil pipe for forming an oil and gas transmission channel, the continuous oil pipe is located in the cavity formed by the casing pipe and the horizontal liner pipe in the defined mode, and a hot fluid injecting pipe is installed in the continuous oil pipe. The embodiment can be used for collaborative development of electromagnetic waves and hot fluid.

Description

technical field [0001] The present application relates to oil production equipment in an oil field, in particular to a downhole electric heating horizontal production well string structure. Background technique [0002] At present, for the development of horizontal wells in heavy oil reservoirs, horizontal wells are mainly used for steam huff and puff, steam flooding and steam assisted gravity drainage (SAGD). However, due to the high energy consumption of steam injection, large carbon emissions, and high energy consumption, it is necessary to develop new heating technologies for heavy oil recovery. At present, technologies such as electric heating for heavy oil recovery have emerged, and may become one of the most potential development technologies for heavy oil development in the future. [0003] Theoretical research shows that the combination of electromagnetic wave heating generated by magnetic dipoles and the current steam injection or light hydrocarbon solvent injecti...

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Problems solved by technology

[0004] In the process of realizing the present application, the inventors of the present application found that the synergistic development of the above-mentioned electromagnetic wave and steam injection, injection of light hydrocarbon solvent, water, etc. is still in the theoretical research stage, and has not yet been applied in practice.

The reason for the lack of practical application is that the existing horizontal injection well string structure used in the development of heavy oil is usually designed for a single heating method, so it cannot be applied to the coordinated development of electromagnetic waves and steam injection, light hydrocarbon solvent injection, water injection, etc.

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