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Thermal recovery technology of multielement thermal fluid of thickened oil well

A technology of multi-component thermal fluid and thermal recovery technology, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc. It can solve the problem of low oil recovery rate and ultimate recovery rate, difficulty in greatly increasing heavy oil recovery rate, Poor economic benefits and other problems, to achieve the effect of light weight, improve oil displacement efficiency, and reduce heat loss

Inactive Publication Date: 2011-11-02
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

The current conventional water injection cold recovery development is difficult to greatly increase the recovery rate of heavy oil, the estimated oil recovery rate and ultimate recovery rate are far lower than the expected value of the oilfield development plan, and the economic benefits are poor

Method used

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  • Thermal recovery technology of multielement thermal fluid of thickened oil well
  • Thermal recovery technology of multielement thermal fluid of thickened oil well

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Embodiment Construction

[0028] The general principle of the present invention is explained below with regard to a certain offshore heavy oil well in Bohai Bay as an example, but it should be noted that the present invention is by no means limited to offshore heavy oil wells.

[0029] The heavy oil well is a horizontal branch well with an inclination depth of 1195-1703m (the vertical depth in the middle of the oil layer is 941m), the horizontal well section is 517.25m long, and the average vertical thickness of the oil layer is 7.9m. s. The average daily oil production of this heavy oil well is 35t / d when the electric submersible pump is used for cold recovery.

[0030] first reference figure 1 , deliver diesel oil from the fuel tank 1 to the generator 6 at a rate of 70-90kg / h through the oil injection pump 4, and deliver pressurized fuel to the generator 6 at a rate of 1000-1200kg / h through the air compressor and booster 3 The air (pressure is less than 25MPa), after the igniter in the generating d...

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Abstract

The invention relates to a thermal recovery technology of a multielement thermal fluid of a thickened oil well, comprising the step of injecting a multielement thermal fluid and annular injection nitrogen into an oil layer together. The invention relates to a thermal recovery technology of a multielement thermal fluid of an offshore thickened oil well.

Description

technical field [0001] The invention relates to a thermal recovery process of multiple thermal fluids in heavy oil wells. Background technique [0002] my country's heavy oil resources are widely distributed. At present, a large number of onshore heavy oil reservoirs have been discovered in 15 large and medium-sized oil-bearing basins and regions such as Songliao Basin, Bohai Bay Basin, Junggar Basin, and Erlian Basin; Heavy oil accounts for more than 60% of the oil fields, and the heavy oil reserves in the Bohai Bay region account for about 80% of the total reserves in the region. The currently used heavy oil recovery technologies mainly include thermal oil recovery technology (steam huff and puff, steam flooding, SGAD, SAGP, FAST, hot water flooding, electromagnetic heating, burning oil layers, etc.), sand production cold recovery technology, carbon dioxide huff and puff recovery technology and wellbore degassing technology. Among viscous oil recovery technologies, steam h...

Claims

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Application Information

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IPC IPC(8): E21B43/243
Inventor 孙永涛林涛马增华张玉久孙玉豹刘海涛王少华张伟顾启林
Owner CHINA NAT OFFSHORE OIL CORP
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