Full-shaft heat-insulation electric submersible pump injection-production integrated pipe column applied to 370-DEG C thermal production well and operation method thereof

Abstract

The invention discloses a full-shaft heat-insulation electric submersible pump injection-production integrated pipe column applied to a 370-DEG C thermal production well and an operation method thereof. The pipe column comprises an oil pipe, a Y connector, a heat-insulation oil pipe short section, a high-temperature electric pump unit, a Y-shaped penetrating device, a high-temperature deep well packer and a pipeline. According to the pipe column, the process conversion of steam huff and puff from heat injection to production is achieved without moving the pipe column, the injection-production integrated technology is achieved, the operation cost is reduced, and the thermal production efficiency is improved; full-shaft heat insulation is adopted in the technology of the pipe column, no hot spot exists in the whole process, and the operation safety of an electric submersible pump is further guaranteed; meanwhile, the scheme meets the requirements for marine safety and environmental protection, a high-temperature safety control system is arranged underground, and the safety of shaft steam injection production can be guaranteed; and according to the scheme, temperature data monitoring can be carried out on a full shaft through optical fibers, and technical support is provided for later process scheme optimization. The pipe column has great significance in large-scale development of Bohai Sea thickened oil.

Description

technical field [0001] The invention belongs to the thermal recovery downhole process string technology of a heavy oil oilfield, specifically a full wellbore heat-insulated electric submersible pump injection-production integrated string applied to a 370-degree thermal recovery well and an operation method thereof. Background technique [0002] Due to the particularity of the offshore environment and environmental protection requirements, the steam huff and puff thermal recovery process strings in land oilfields are not suitable for the Bohai Sea. Therefore, according to the characteristics of production wells in offshore oilfields (steam injection temperature is as high as 370°C), thermal recovery uses two injection-production process tubes The column, that is, the light tube injects steam, and the high-temperature electric submersible pump lifts it. This technology has the following problems: [0003] 1. The cost of well completion and workover is high, and the conversion ...

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Problems solved by technology

[0003] 1. The cost of well completion and workover is high, and the conversion of injection and production requires moving string operation, and leakage occurs during the workover process, which seriously affects the effect of steam injection

[0004] 2. There is no underground safety control system, and in extreme cases, the safety of personnel's life and property and the safety of the marine environment cannot be guaranteed

[0005] 3. Without downhole monitoring technology, it is impossible to accurately analyze the steam injection effect after steam huff and puff, and provide technical support for the optimization of steam injection technology in the later stage

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