Air-injection displacement oil production method for producing oil from horizontal wells by means of injecting air in vertical wells

A horizontal well and air flooding technology, applied in wellbore/well parts, production fluid, earthwork drilling and production, etc., to achieve the effects of enhanced oil recovery and oil production speed, high sweep coefficient, and efficient utilization

Inactive Publication Date: 2016-11-09
中嵘能源科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems existing in the existing vertical well and horizontal well combined oil recovery technology, the present invention provides an air flooding oil production method for vertical well injection and horizontal well oil production

Method used

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  • Air-injection displacement oil production method for producing oil from horizontal wells by means of injecting air in vertical wells

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Effect test

Embodiment 1

[0026] An air flooding oil production method for vertical well injection and horizontal well oil production, which is completed by the following steps, including: 1. According to the geological analysis of the oil reservoir, determine the arrangement of vertical well gas injection wells (3) and horizontal well production wells (1) to ensure that the vertical well The angle between the two ends of the horizontal section (2) of the gas injection well (3) and the production well (1) is 30°; ) at 3 meters below the bottom of the fan-shaped perforation, and the perforation density is 15 holes / m; 3. Nitrogen pressure test: connect the 800 standard square nitrogen injection pipeline to the gas injection well (3), and carry out pressure test on the oil layer through the nitrogen truck; 4. Through the steam boiler and supporting facilities, inject 120 tons of high-temperature steam into the gas injection well (3), the steam temperature is 300°C, and the steam dryness is 70%; The fan-sh...

Embodiment 2

[0028] An air flooding oil production method for vertical well injection and horizontal well oil production, which is completed by the following steps, including: 1. According to the geological analysis of the oil reservoir, determine the arrangement of vertical well gas injection wells (3) and horizontal well production wells (1) to ensure that the vertical well The angle between the two ends of the horizontal section (2) of the gas injection well (3) and the production well (1) is arranged at 36°; ) fan-shaped perforation at 6 meters below, the perforation density is 20 holes / m; 3. Nitrogen pressure test: connect the 1500 standard square nitrogen injection pipeline to the gas injection well (3), and carry out pressure test on the oil layer through the nitrogen truck; 4. Through the steam boiler and supporting facilities, inject 180 tons of high-temperature steam into the gas injection well (3), the steam temperature is 330°C, and the steam dryness is 90%; The fan-shaped perf...

Embodiment 3

[0030] An air flooding oil production method for vertical well injection and horizontal well oil production, which is completed by the following steps, including: 1. According to the geological analysis of the oil reservoir, determine the arrangement of vertical well gas injection wells (3) and horizontal well production wells (1) to ensure that the vertical well The angle between the two ends of the horizontal section (2) of the gas injection well (3) and the production well (1) is arranged at 45°; ) fan-shaped perforation is carried out at 5 meters below, and the perforation density is 18 holes / m; 3. Nitrogen pressure test: connect the 1200 standard square nitrogen injection pipeline to the gas injection well (3), and carry out pressure test on the oil layer through the nitrogen truck; 4. Through the steam boiler and supporting facilities, inject 150 tons of high-temperature steam into the gas injection well (3), the steam temperature is 320°C, and the steam dryness is 80%; ...

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Abstract

The invention discloses an air-injection displacement oil production method for producing oil from horizontal wells by means of injecting air in vertical wells. By the aid of the air-injection displacement oil production method, problems of low sweep coefficients of oil reservoirs, small receiving areas of existing production wells, low oil production speeds and recovery ratios and the like due to main vertical well-vertical well and vertical well-horizontal well oil production modes for air-injection displacement oil production at present can be solved. The air-injection displacement oil production method includes that an air injection well of each vertical well and two ends of a horizontal section of a production well are arranged to form included angles of 30-45 degrees, fan-shaped perforation is carried out on positions, 3-6 meters below the horizontal wells, of the vertical wells, nitrogen pressure tests are carried out, high-temperature steam and air are injected into the air injection wells to carry out spontaneous ignition, and air-injection displacement oil production can be carried out on the horizontal wells. The air-injection displacement oil production method has the advantages that the air-injection displacement oil production method is high in sweep coefficient of oil reservoirs; feed-through characteristics of air-injection displacement oil production can be sufficiently utilized, pyrolysis reaction generated by the air injected into the air injection wells of the vertical wells is nearly circularly diffused around the air injection wells, the production wells of the horizontal wells are provided with fan-shaped receiving surfaces and are wide in receiving area, accordingly, the air-injection displacement oil production method can be high in recovery percent under the propulsion effects of fan-shaped pyrolysis zones, and the recovery rates and the oil production speeds can be increased.

Description

technical field [0001] The invention relates to an air flooding oil recovery method in which air is injected into a vertical well and oil is produced in a horizontal well, belonging to the field of air flooding oil recovery. Background technique [0002] At present, most countries use water flooding in the field of oil exploitation. When water flooding enters the later stage, the water content of the production well will be too high, resulting in ineffective water circulation and insufficient formation energy. Air flooding technology can be applied to wells with low water flooding efficiency , shut-down wells, semi-shutdown wells, etc., compared with other oil recovery methods, the difference is that after the air enters the oil layer, the oxygen part in the air reacts with the crude oil to oxidize and crack the crude oil, the macromolecular chain breaks to form small molecules, and produces a large amount of carbon dioxide. The dissolution of carbon dioxide in crude oil enh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/247
CPCE21B43/168E21B43/247
Inventor 邓晓亮洪兆
Owner 中嵘能源科技集团有限公司
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