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Deep low penetrating oil layer thin oil fire flooding horizontal well gas-injection horizontal well oil production process technology

A process technology and a technology for horizontal wells, which are applied in the technical field of thin oil fire flooding horizontal wells in deep low permeability oil layers, gas injection horizontal wells, and oil production technology fields, and can solve the problems of limited exploitation, unproducible performance, poor permeability, and difficulty in thin oil development.

Inactive Publication Date: 2007-01-03
尤尼斯油气技术(中国)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of scientific and technological progress, horizontal drilling technology has been widely promoted in oil fields. Because horizontal drilling expands the oil drainage area of ​​a single well oil layer, it is very popular. In addition, it can save drilling costs during the drilling process. At present, the current Technical utilization of horizontal well oil recovery at home and abroad is mainly through the steam oil recovery method to extract the crude oil in the oil layer, and the lithology of this kind of oil reservoir is buried shallow, the permeability is high, generally above 50MD, and the lithology is relatively loose and uniform, but For oil wells with a depth of less than 2000 meters, especially some tight sandstones less than 50 MD, due to the deep burial of oil reservoirs, it is difficult to develop thin oil. So far, the production of deep low-permeability oil layers has been limited and cannot be produced, which has become a major problem in oilfield development.
The method of using the fire-flooding horizontal well injection-production method proposed by the present invention to exploit the thin oil in the deep low-permeability oil layer is to use the characteristics of the deep oil layer itself, which is tight in lithology and poor in permeability, through high-pressure gas injection in the horizontal well The complex process of burning oil in the flooding section enables the production of thin oil from the production well. According to investigations, this technology has not been reported so far.

Method used

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  • Deep low penetrating oil layer thin oil fire flooding horizontal well gas-injection horizontal well oil production process technology
  • Deep low penetrating oil layer thin oil fire flooding horizontal well gas-injection horizontal well oil production process technology

Examples

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Embodiment 1

[0025] figure 1 Among them, the design depth of oil production well 1 and gas injection well 2 are both rock formations below 2000 meters, their permeability is less than 30DM, the viscosity of thin oil is 20-100MP.S at 50°C, it can flow below 75°C, and the density of thin oil is 0.9g / cm 3 Below, the lithology is sandstone body or ancient buried hill fracture reservoir. After the above conditions are met, the fire flooding horizontal oil production well section can be drilled.

[0026] Determine the position of the ignition layer in the gas injection well after completion:

[0027] 1. The ignition layer, that is, the fire displacement oil layer, should be selected within the horizontal section 3 of the horizontal gas injection well 2, because in the ignition well, only the oil reservoir in the horizontal well section has the largest exposure surface, and in general, the oil layer exposure layer is proportional to the horizontal well depth distance , which can increase the oi...

Embodiment 2

[0034] When the conditions in Example 1 are met, the exposed single horizontal section oil layer in the gas injection well 2 can be injected with high-pressure air by a WV-12 type compressor to implement ignition and drive the horizontal section oil layer, and produce in the oil production well 1 , if a large area of ​​oil production area is required, it can also be figure 2 The well layout method uses the multi-stage compressor unit 4 and the parallel horizontal oil production well 1 and horizontal gas injection well 2 to ignite in the horizontal section of the gas injection well 1 as described above, and the thin oil is produced in the horizontal section of the oil production well 2. crude oil is sent out through oil pipeline 5, like this, will improve the recovery degree of thin oil to a greater extent.

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Abstract

The present invention relates to a deep-layer low-permeability oil reservoir thin oil combustion drive horizontal well air injection horizontal well oil production technique. It is characterized by that said invention utilizes the heat quantity produced in air injection horizontal well section as firing drive oil reservoir and transfers the heat quantity into the horizontal oil-producing wells distributed at two sides of the air injection horizontal well section so as to make the thin oil be recovered from the oil-producing wells.

Description

Technical field: [0001] The invention relates to a thin oil fire-flooding horizontal well gas injection horizontal well oil production technology in a deep low-permeability oil layer, which belongs to the fire-flooding oil recovery method for thin oil recovery. Background technique: [0002] With the development of scientific and technological progress, horizontal drilling technology has been widely promoted in oil fields. Because horizontal drilling expands the oil drainage area of ​​a single well oil layer, it is very popular. In addition, it can save drilling costs during the drilling process. At present, the current Technical utilization of horizontal well oil recovery at home and abroad is mainly through the steam oil recovery method to extract the crude oil in the oil layer, and the lithology of this kind of oil reservoir is buried shallow, the permeability is high, generally above 50MD, and the lithology is relatively loose and uniform, but For oil wells with a depth ...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 邓惠荣郎米勒张吉林祝学江
Owner 尤尼斯油气技术(中国)有限公司
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