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Integral insulated tubing column structure

A heat-insulating oil pipe and pipe string technology, which is applied in the direction of drilling pipe, casing, isolation device, etc., can solve the problems of poor air tightness of heat-insulated oil pipe, heat insulation effect needs to be improved, etc., and achieve good thermal insulation performance Effect

Pending Publication Date: 2021-07-23
淄博孚瑞特热能科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to aim at the technical defects of the prior art and provide an integral heat-insulated oil pipe column structure to solve the technical problems of poor air tightness and thermal insulation effect of conventional heat-insulated oil pipes

Method used

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  • Integral insulated tubing column structure
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Embodiment 1

[0022] An overall heat-insulated oil tubing string structure, including several unit pipes connected head to tail in sequence, such as figure 1 As shown, the unit tube includes an outer tube 1, an inner tube 2, a heat insulation cavity 3, a secondary thread 4 at the II end, a primary thread 5 at the II end, a weld seam 6 of the inner and outer tubes at the II end, and a primary thread 7 at the I end. , I-end secondary threads 8, I-end inner and outer pipe welds 9, I-end thread inner sealing end face 10, II end thread outer sealing end face 11, wherein the inner pipe 2 is located inside the outer pipe 1, and the two ends of the inner pipe 2 are respectively The outer pipe 1 is connected to the outer pipe 1 through the welding seam 9 of the inner and outer pipe at the I end and the inner and outer pipe welding seam 6 at the II end. There is a heat-insulating cavity 3 between the outer pipe 1 and the inner pipe 2, and the inner wall of one end of the outer pipe 1 is provided with ...

Embodiment 2

[0024] An overall heat-insulated oil tubing string structure, including several unit pipes connected head to tail in sequence, such as figure 1 As shown, the unit tube includes an outer tube 1, an inner tube 2, a heat insulation cavity 3, a secondary thread 4 at the II end, a primary thread 5 at the II end, a weld seam 6 of the inner and outer tubes at the II end, and a primary thread 7 at the I end. , I-end secondary threads 8, I-end inner and outer pipe welds 9, I-end thread inner sealing end face 10, II end thread outer sealing end face 11, wherein the inner pipe 2 is located inside the outer pipe 1, and the two ends of the inner pipe 2 are respectively The outer pipe 1 is connected to the outer pipe 1 through the weld seam 9 of the inner and outer pipe at the I end and the inner and outer pipe weld seam 6 at the II end. There is a heat-insulating cavity 3 between the outer pipe 1 and the inner pipe 2, and the inner wall of one end of the outer pipe 1 is provided with an I e...

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Abstract

The invention provides an integral insulated tubing column structure. The structure is formed by butting a plurality of unit pipes end to end in sequence. According to the integral insulated tubing column structure, internal threads and external threads are respectively machined on both ends of the unit pipes, two pipe columns are directly connected through the pipe body threads, and a coupling is not needed. Connecting threads are of a two-stage thread structure, the threaded end surface is provided with a conical sealing surface, and the airtight sealing performance is achieved. The double-stage threads are designed, so that the wall thickness size of an outer pipe of a connection overlapping section is reduced on the premise that the threaded connection strength is guaranteed, the inner thickening design is adopted for the outer pipe end of a pipe body, the outer diameter size of the pipe end of the pipe body is reduced, enough space is reserved for the overlapping vacuum heat insulation design of the connection overlapping section, vacuum heat insulation is achieved in the radial direction of the whole pipe column within the full-length range of the pipe column after the whole pipe column is connected, no direct heat dissipation point exists, and good heat preservation and heat insulation performance is achieved. The design is suitable for full-size model design of a heat insulation oil casing.

Description

technical field [0001] The invention relates to the technical field of petroleum machinery, in particular to an integral heat-insulating oil pipe string structure. Background technique [0002] In oil extraction technology, insulated tubing is one of the necessary downhole tools for steam injection. Since steam injection will undergo heat exchange during the injection process, the temperature of the steam will decrease, resulting in heat loss, making it difficult to meet the production demand. The insulated tubing has a good heat insulation effect and can reduce the heat loss of the oil well. The heat-insulated oil pipe is generally a double-layer concentric pipe string structure, and the annular space of the two-layer pipe is filled with heat-insulating material, inert gas or vacuum. When steam injection is used to exploit heavy oil, the use of heat-insulated tubing can reduce heat loss and improve steam dryness. [0003] In the overall structure of the heat-insulated oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00E21B17/08E21B36/00
CPCE21B17/00E21B17/08E21B36/003
Inventor 丁英杰董世超柳沣洵刘志龙于继飞李孟龙曹景强高山
Owner 淄博孚瑞特热能科技有限公司
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