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

An electric submersible pump and thermal recovery well technology, which is applied in the fields of production fluids, wellbore/well components, earth-moving drilling, etc., can solve the problems of high workover cost, leakage, and sound steam injection effect, etc., to ensure production safety. , Guarantee operation safety, improve the effect of thermal recovery efficiency

Pending Publication Date: 2021-07-09
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment

[0030] as attached figure 1 As shown, the present invention discloses a full-bore heat-insulated electric submersible pump injection-production integrated string applied to 370-degree thermal recovery wells, mainly including a steam injection process system, a lifting process system, a safety control system, and a downhole monitoring system .

[0031] The upper part of the Y joint A-2 is connected to the 4-1 / 2" heat-insulated oil pipe A-1, and the high-temperature electric pump unit B-2 is connected to the pump front II and the check valve B-4, and the heat-insulated short The connection B-5 is connected to the first-stage check valve B-3 in front of the pump, and the first-stage check valve B-3 in front of the pump is connected to the lower end of the Y joint A-2 to form a lifting channel.

[0032] The upper end of the small-diameter heat-insulated oil pipe A-3 is connected to the lower end of the Y joint A-2, and the lower end is connected to the 4-1 / 2" heat-insulated oil p...

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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 ...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/22
CPCE21B43/24E21B43/166
Inventor 柳沣洵刘志龙刘全刚刘海英李令喜于继飞董世超张成富
Owner CNOOC ENERGY TECH & SERVICES
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