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An improved heavy oil thermal recovery method and device

A technology for thermal recovery of heavy oil and oil layers, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of steam drive and low recovery rate, so as to improve oil recovery and reduce steam channeling Effect

Inactive Publication Date: 2017-03-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the whole process of heavy oil production, the existing technology of using steam huff and puff first and then steam flooding has not been fundamentally improved, which leads to low recovery during steam huff and puff and steam channeling during steam flooding. The problem has not been fundamentally resolved

Method used

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  • An improved heavy oil thermal recovery method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method of using the above-mentioned heavy oil thermal recovery device, comprising the following steps:

[0030] A. Several oil wells are set in the production area, so that each oil well runs through each oil layer in the production area, and the heavy oil thermal recovery device is lowered into the oil well, and a gas injection device is arranged in each oil layer;

[0031] B. Use the gas injection pipeline 2 to inject steam into each oil layer, the injection pressure is 3.7MPa, the steam dryness is 25%, the steam temperature is 300°C, and the injection speed is 1700m 3 / h, the injection time is 30h;

[0032] C. After the steam injection is completed, carry out the first stewing well, and the stewing time is 40h;

[0033] D. After the first soaking well, carry out secondary steam injection into each oil layer, and perform the second soaking well after the second steam injection, and repeat this step several times until the pressure drop rate in the well during the w...

Embodiment 2

[0045] A method of using the above-mentioned heavy oil thermal recovery device, comprising the following steps:

[0046] A. Several oil wells are set in the production area, so that each oil well runs through each oil layer in the production area, and the heavy oil thermal recovery device is lowered into the oil well, and a gas injection device is arranged in each oil layer;

[0047] B. Use the gas injection pipeline 2 to inject steam into each oil layer, the injection pressure is 4.3MPa, the steam dryness is 30%, the steam temperature is 260°C, and the injection speed is 2200m 3 / h, the injection time is 25h;

[0048] C. After the steam injection is completed, carry out the first stewing well, and the stewing time is 40h;

[0049] D. After the first soaking well, carry out secondary steam injection into each oil layer, and perform the second soaking well after the second steam injection, and repeat this step several times until the pressure drop rate in the well during the w...

Embodiment 3

[0060] This embodiment is basically the same as Embodiment 2, and will not be described in detail here. The difference is that in step D, after the completion of the second brine well, the check valve 10 is first opened, and the auxiliary injection pipeline 3 is used to check the oil in the oil layer. Crude oil is pre-extracted, and the amount of each pre-extraction is controlled at 0.3 to 0.4 tons. With the increase in the number of brine wells, the amount of each pre-extraction gradually decreases. Pre-extraction after soaking the well can reduce the air resistance of steam in the oil layer, improve the fluidity of heavy oil in the oil layer, and improve the reaction between steam, hot water and the catalyst injected together with hot water and heavy oil, thereby improving the oil output. oil volume.

[0061] After experimental comparison, the comparison of the average daily oil production and the average daily steam consumption using the existing technology (initial steam h...

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Abstract

The invention discloses an improved heavy oil thermal recovery device. The device comprises a pumping rod; the pumping rod is provided with at least two sets of independent gas injection devices; each gas injection device comprises a gas injection pipeline, an auxiliary injection pipeline and a sampling pipeline; the top end of each gas injection pipeline is provided with a steam injection valve and an oil outlet valve; the top end of each auxiliary injection pipeline is provided with a check valve; a pressure sensor probe, a temperature sensor probe and a dryness sensor probe are arranged in the sampling pipeline. The invention also discloses a heavy oil recovery method by using the heavy oil thermal recovery device. A steam huff and puff mode and a steam flooding mode are organically combined and are used circularly. The device and the method can overcome defects in the prior art, the oil extraction rate in the whole heavy oil recovery process is improved and the exploitation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an improved heavy oil thermal recovery method and device. Background technique [0002] Heavy oil is an important oil resource in the 21st century. The reserves of heavy oil, super heavy oil and natural bitumen in the world are about 1000×108 tons, accounting for 53% of the world's remaining recoverable oil reserves, mainly distributed in Canada, Venezuela, the United States, and China and other countries and regions. Heavy oil accounts for 40% of my country's remaining recoverable oil reserves, of which medium-deep heavy oil accounts for 70%. [0003] The way of heavy oil production is mainly to take measures to improve the fluidity of crude oil, increase the oil-water mobility ratio and increase the displacement efficiency of crude oil. At present, heavy oil recovery is mainly based on thermal oil recovery, which mainly includes steam huff and puff, steam flood...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24
CPCE21B43/24
Inventor 张茂林董越王彦升窦雪锋纪成段明付明德富王怀龙郭沙沙温志平蔡珺君陈杜鹃
Owner SOUTHWEST PETROLEUM UNIV
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