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CO2 fracturing displacement integrated oil extraction method for aiming at tight oil reservoir

A technology for tight oil reservoirs and fracturing, which is applied in the fields of fluid production, earth-moving drilling and production, wellbore/well components, etc. It can solve problems such as low permeability, difficult injection and production between wells, etc., and achieve the effect of avoiding damage and environmental pollution.

Active Publication Date: 2018-12-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, for tight oil reservoirs, due to the extremely low permeability, it is difficult to conduct interwell injection-production development through conventional well patterns

Method used

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  • CO2 fracturing displacement integrated oil extraction method for aiming at tight oil reservoir
  • CO2 fracturing displacement integrated oil extraction method for aiming at tight oil reservoir

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Embodiment

[0030] A CO2 for tight oil reservoirs 2 The fracturing-flooding integrated oil production method is characterized in that: it includes: starting from the toe of the horizontal well to the direction of the heel in sequence, performing fracturing and oil-flooding on the segmented units sequentially, and using liquid Carbon dioxide performs staged sealing and fracturing of horizontal wells; in the oil displacement stage, after the segmented units of the horizontal well are fractured to form fractures, high-pressure carbon dioxide is continuously injected into the segmented units to perform segmented sealing and flooding. Among them, the high-pressure CO 2The injection parameters are determined according to the reservoir engineering method or test injection results, and the injection pressure is lower than the fracture pressure of the formation.

[0031] CO for tight oil reservoirs 2 The specific method of integrated oil recovery by fracturing and flooding includes selecting the...

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Abstract

A CO2 fracturing displacement integrated oil extraction for aiming at a tight oil reservoir is characterized by comprising the steps of successively performing fracturing and displacement on segmentedunits in a direction from the toe part of a horizontal well to the heel part, and in a fracturing period, performing segmented closed fracturing on the horizontal wall by means of liquid carbon dioxide; and in the displacement period, after cracks of the horizontal wall segmented unit are generated through fracturing, injecting high-pressure carbon dioxide into the segmented unit for performing segmented closed displacement. According to the method of the invention, an always CO2 injection state is utilized, thereby realizing no discharge returning and obtaining functions of sand carrying, seam generation, stratum energy supplementing and displacement. Not only is fracturing liquid effectively used for supplementing energy, but also tight oil reservoir displacement oil extraction is realized. Furthermore an injection amount and an injection time length can be selected according to an actual development requirement, thereby realizing integration of reservoir yield increase fracturing reconstruction and displacement.

Description

technical field [0001] The present invention relates to a CO 2 The utility model relates to an integrated oil recovery method of fracturing and flooding, which belongs to the technical field of tight oil reservoir development engineering in the development of oil and gas fields. Background technique [0002] Tight oil reservoirs refer to the self-generated and self-storage, continuous distribution, and no large-scale long-distance migration that occur in organic-rich and extremely low-permeability dark shale, argillaceous siltstone, and sandstone interlayer systems in an adsorbed or free state. Oil accumulations with reservoir porosity less than 10% and air permeability less than 1 mD. my country's tight oil reserves are large, and with the sharp increase in energy demand in my country, tight oil will have a good resource prospect. How to achieve efficient and steady-state development has been the research direction of technicians in this field, and it is also the face of u...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/16
CPCE21B43/164E21B43/26
Inventor 李宾飞柏浩李兆敏许建国李爱山张燎源史大山郑超
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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