Downhole steam secondary electric heating pipe column and heating method

A heating method and secondary electric technology, applied in the shape of heating elements, earthwork drilling, wellbore/well parts, etc., to achieve the effect of improving steam sweeping effect, improving dryness, and improving steam throughput

Pending Publication Date: 2022-03-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of improving the dryness of downhole steam, the present invention provides a secondary electric heating pipe string and heating method for downhole steam, which can reheat the steam injected into the bottom of a heavy oil well through the arrang

Method used

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  • Downhole steam secondary electric heating pipe column and heating method
  • Downhole steam secondary electric heating pipe column and heating method
  • Downhole steam secondary electric heating pipe column and heating method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0028] Example 1

[0029] The overall design idea of ​​the present invention: In order to improve the dryness of the underground, consider using the ground boiler to heat the steam, the steam to the bottom of the well is reheated, and for the steam drive, the SAGD depth is 1000-2000 meters deep well, this The way can effectively improve the dryness of the underground. The present invention is subjected to secondary heating of the low-drying steam of the well bottom by a steam wellhead, and the bottom electrical heater 6 is heated twice to the low dryness steam of the bottom well, so that the steam temperature of the bottom of the bottom is greatly Improved to facilitate the high temperature and high pressure diffusion of steam, increase steam wave and effect, increase steam throughput, steam drive, SAGD heating efficiency, and dryness indicators can increase 20-30%.

[0030] For the secondary heating technique of underground steam, it is mainly targeted that the soil steam is used...

Example Embodiment

[0037] Example 2

[0038] A continuous oil pipe 5 for the method of embodiment 1:

[0039] Includes continuous pipe body 12, cable core A9, insulator A11, upper head 10, next head 13,

[0040] The outer diameter of the continuous tubular body 12 is 25.4 mm, the wall thickness is 2.4 mm, and 316L stainless steel is used. There is three cable core A9, including the three cable core A9, the cable core A9 material uses an oxygen-free copper, the diameter is 6mm, the cable core A9 The insulator A11 is filled between the continuous tubular body 12, and the insulator A11 is selected to be magnesium oxide powder. As an insulating use, it is possible to resist high temperature and transfer heat. The upper head 10, the lower head 13 is mounted on both ends of the continuous tubular body 12, for sealing the insulator A11, so that the insulator A11 is isolated from the outside air to prevent interference from being tidy. The upper head 10, the lower head 13 is 10 cm, and the epoxy resin is us...

Example Embodiment

[0056] Example 3

[0057] The various columns described in Example 2 not only apply to the horizontal well injection ceramics, but also for horizontal well production well, when used in horizontal well production well, heated medium is exchanged to oil well output liquid, production mode is used in φ114mm oil pipe 2 -1 and φ120mm tube pump 3-1 perform a well-heating assisted oil production.

[0058] When the viscosity of the horizontal well output is large, when the wax can be waxed, the power can be used to adjust the power, and the electric heater 6 of the bottom bottom is hot, and the temperature of the heating is adhered, improves the temperature of the oil well exit, improves horizontal well Yield. When the output liquid is large, the well production can be carried out, and the control cabinet 8 high power output is adjusted, so that the electric heater 6 is powered on the bottom of the bottom of the bottom, so that high temperature water or steam is generated, and hot water ...

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Abstract

The invention discloses an underground steam secondary electric heating tubular column and a heating method, and relates to the field of oil and gas field steam injection heavy oil exploitation. A continuous oil pipe and an electric heater are arranged in a steam wellhead, and the electric heater at the bottom end performs secondary heating on low-dryness steam at the bottom of the well, so that the temperature and pressure of the steam at the bottom of the well are increased, and the dryness is greatly improved; and high-temperature and high-pressure diffusion of steam is facilitated, the steam sweep effect is improved, then the operation effects of steam huff and puff, steam drive and SAGD are improved, and the dryness index can be improved by 20-30%.

Description

technical field [0001] The invention relates to the field of heavy oil recovery by steam injection in oil and gas fields, in particular to a secondary electric heating pipe string and a heating method for downhole steam. Background technique [0002] Due to the high viscosity of heavy oil in the oil, large seepage resistance, and fast rise of water content, thermal recovery of heavy oil is mostly used. The main methods include: steam huff and puff, steam flooding, SAGD, and fire flooding. Among them, steam injection to extract heavy oil is the most important oil recovery method. The exploitation of heavy oil by steam injection can improve the steam absorption capacity of the reservoir, improve the sweep coefficient and increase the fluidity of crude oil. Steam huff and puff, steam flooding, SAGD and other methods all require the higher the dryness of the steam injected downhole, the better, but the actual effect is not ideal, because the greater the depth, the longer the pi...

Claims

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Application Information

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IPC IPC(8): E21B43/24H05B3/40
CPCE21B43/2401E21B43/2406H05B3/40
Inventor 杨显志赵超袁爱武孙光雄李广富袁天瑜王健骁刘祥刘丹屈振哲吴迪张福兴杨宝春程云龙刘锦王永江金佳毅廖培淳田宇桐王大鹏
Owner PETROCHINA CO LTD
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