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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 arrangement of coiled tubing and an electric heater. Improve the dryness of steam injection at the bottom of the well and the swept volume of steam to produce a better displacement effect, and have great applicability to deep wells with steam flooding and SAGD depths of 1000-2000 meters

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

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Embodiment 1

[0029] The overall design idea of ​​the present invention: in order to improve the dryness of downhole steam, consider using the surface boiler to heat the steam once and then reheat the steam reaching the bottom of the well twice. For deep wells with steam flooding and SAGD depths of 1000-2000 meters, this This method can effectively improve the dryness of downhole steam. In the present invention, the coiled tubing 5 and the electric heater 6 are lowered into the steam wellhead, and the bottom electric heater 6 reheats the low-quality 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. Improvement to facilitate the high-temperature and high-pressure diffusion of steam, improve the steam sweep effect, improve the heating efficiency of steam stimulation, steam flooding, and SAGD, and the dryness index can be increased by 20-30%.

[0030] As for the downhole steam seconda...

Embodiment 2

[0038] The coiled tubing 5 that is used for the method described in embodiment 1:

[0039] Including continuous pipe body 12, cable core a9, insulator a11, upper head 10, lower head 13,

[0040] The outer diameter of the continuous pipe body 12 of this embodiment is 25.4mm, and the wall thickness is 2.4mm. It is made of 316L stainless steel, and three cable cores a9 are penetrated in the middle. The insulator a11 is covered between the continuous pipe body 12, and the material of the insulator a11 is magnesium oxide powder, which is used as insulation and can resist high temperature and transfer heat. The upper sealing head 10 and the lower sealing head 13 are installed on both ends of the continuous pipe body 12 respectively, and are used to seal the insulator a11, isolate the insulator a11 from the outside air, and prevent interference from getting wet. Upper sealing head 10, lower sealing head 13 are 10 centimeters long, adopt epoxy resin material. The length of the cable...

Embodiment 3

[0057] The tubing strings described in Example 2 are not only applicable to horizontal well steam injection wells, but also to horizontal well production wells. When used in horizontal well production wells, the heating medium is replaced by oil well production fluid, and the production method adopts Φ114mm tubing 2 -1 and Φ120mm tubular pump 3-1 are used for bottomhole heating to assist oil production.

[0058] When the viscosity of the output fluid in the horizontal well increases and wax is produced, the control cabinet 8 can be used to adjust the power, and the electric heater 6 at the bottom of the well can be energized and heated to realize heating and viscosity reduction, increase the temperature of the output fluid at the outlet of the oil well, and increase the temperature of the horizontal well Yield. When the water content of the produced fluid is large, the well production can be stopped, and the high-power output of the control cabinet 8 can be adjusted to energiz...

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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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