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A hot nitrogen assisted steam huff and puff recovery system and method for heavy oil reservoirs

A heavy oil reservoir, hot nitrogen technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc.

Active Publication Date: 2021-02-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No steam is used in this process, but the viscosity is reduced mainly by hot nitrogen and the heat of injected hot water

Method used

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  • A hot nitrogen assisted steam huff and puff recovery system and method for heavy oil reservoirs
  • A hot nitrogen assisted steam huff and puff recovery system and method for heavy oil reservoirs
  • A hot nitrogen assisted steam huff and puff recovery system and method for heavy oil reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] To exploit heavy oil reservoirs, the specific development steps are as follows:

[0087] (1) Set the packer 11 in the oil jacket annulus 14, the packer 11 is close to the middle of the oil layer 13, and then shoot the casing 8 at the top of the oil layer 13; Perforation operation, the perforation thickness is 4m, forming the casing perforation section 10; performing perforation operation on the tubing 9 at the bottom of the oil layer 13, the perforation thickness is 4m, forming the tubing perforation section 12 .

[0088] (2) Hot nitrogen gas injection stage: After the hot nitrogen gas heated up to 300°C by the electric heating device is pressurized by the first booster pump 4, it is injected into the oil jacket annulus area through the Christmas tree 6 14, after the oil-casing annulus 14 is filled with hot nitrogen, continue pressurizing, stop gas injection when the injection pressure of hot nitrogen at the wellhead reaches 1.1 times the original formation pressure, a...

Embodiment 2

[0093] To exploit heavy oil reservoirs, the specific development steps are as follows:

[0094] (1) Set the packer 11 in the oil jacket annulus 14, the packer 11 is close to the middle of the oil layer 13, and then shoot the casing 8 at the top of the oil layer 13; Perforation operation, the perforation thickness is 5m, forming the casing perforation section 10; performing perforation operation on the tubing 9 at the bottom of the oil layer 13, the perforation thickness is 5m, forming the tubing perforation section 12 .

[0095] (2) Hot nitrogen gas injection stage: After the hot nitrogen gas heated up to 300°C by the electric heating device is pressurized by the first booster pump 4, it is injected into the oil jacket annulus area through the Christmas tree 6 14, after the oil-casing annulus 14 is filled with hot nitrogen, continue pressurizing, stop gas injection when the injection pressure of hot nitrogen at the wellhead reaches 1.15 times the original formation pressure, ...

Embodiment 3

[0100] To exploit heavy oil reservoirs, the specific development steps are as follows:

[0101] (1) Set the packer 11 in the oil jacket annulus 14, the packer 11 is close to the middle of the oil layer 13, and then shoot the casing 8 at the top of the oil layer 13; Perforation operation, the perforation thickness is 3m, forming the casing perforation section 10; performing perforation operation on the tubing 9 at the bottom of the oil layer 13, the perforation thickness is 3m, forming the tubing perforation section 12 .

[0102] (2) Hot nitrogen gas injection stage: After the hot nitrogen gas heated up to 300°C by the electric heating device is pressurized by the first booster pump 4, it is injected into the oil jacket annulus area through the Christmas tree 6 14, after the oil-casing annulus 14 is filled with hot nitrogen, continue pressurizing, stop gas injection when the injection pressure of hot nitrogen at the wellhead reaches 1.05 times the original formation pressure, ...

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Abstract

The invention relates to the technical field of heavy oil thermal recovery, and discloses a thermal nitrogen-assisted steam huff and puff oil recovery system and method for heavy oil reservoirs. The system includes steam generating device, membrane separation device, Christmas tree, cement sheath, casing, tubing and packer; The casing is set in the cement sheath, and the outer side of the casing is closely connected with the inner side of the cementing sheath; one end of the casing and tubing is fixedly connected with the Christmas tree, and the other end is inserted into the oil layer; the casing is formed near the top of the oil layer. For the perforated section, the tubing is provided with a tubing perforated section near the bottom of the oil layer, and a packer is installed in the annulus of the oil jacket between the two perforated sections; the steam produced by the steam generating device is injected into the tubing through the Christmas tree; Oxygen and nitrogen from the membrane separation unit are respectively sent to the steam generation unit and injected into the annulus area of ​​the oil jacket through the Christmas tree. The system of the invention improves the thermal efficiency of the steam and improves the heavy oil recovery rate.

Description

technical field [0001] The invention relates to the technical field of thermal recovery of heavy oil, in particular to a thermal nitrogen-assisted steam huff and puff recovery system and method for heavy oil reservoirs. Background technique [0002] With the increasing development of the global economy, the world's demand for oil is growing rapidly. At present, the geological reserves of heavy oil in the world are about 6.3×10 12 bbl, which occupies a relatively large proportion of the world's oil and gas resources. Heavy oil, that is, high-viscosity heavy crude oil, is usually called asphalt or heavy oil. Its outstanding features are high content of colloid and asphaltene and less wax content, so the viscosity of heavy oil is very high. Under reservoir conditions, heavy oil seepage resistance is high, flow is difficult, and development is difficult. In my country, heavy oil resources are widely distributed, and onshore heavy oil resources account for more than 20% of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/14E21B47/06E21B47/07
CPCE21B43/14E21B43/24E21B47/06E21B47/07
Inventor 张超李兆敏尚朝辉何海峰程显光张学萍
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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