Multistage fracturing horizontal well inter-crack interval CO2 flooding oil extraction method

A horizontal well and fracturing technology, which is applied in wellbore/well components, production fluids, earthwork drilling, etc., can solve the problems of inability to quantitatively evaluate the total oil production and oil production, low production efficiency, and many production processes, etc. Achieving good development effect, improving production status, and rationally allocating production and injection

Active Publication Date: 2016-12-07
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

This technical solution is relatively complicated. In a horizontal well, only three fractures can be injected with water and oil produced at a time. After the three fractures have completed water injection and oil production, the other three adjacent fractures can

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  • Multistage fracturing horizontal well inter-crack interval CO2 flooding oil extraction method
  • Multistage fracturing horizontal well inter-crack interval CO2 flooding oil extraction method

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Embodiment Construction

[0030] In order to further understand the content of the present invention, the present invention will be described in detail below in conjunction with specific examples.

[0031] like figure 1 and figure 2 As shown, according to the multi-stage fracturing horizontal well fracture interval CO of the present invention 2 An embodiment of the oil flooding recovery method, it comprises the following steps in sequence:

[0032] Step 1: Fracturing the wellbore of the horizontal well in stages to form multiple fracturing fractures perpendicular to the wellbore of the horizontal well;

[0033] Step 2: Install tubing I2 and tubing II3 in the casing 1 in the wellbore of the horizontal well, install flow controller I6 on the tubing I2 corresponding to the even-numbered fracture 4, and install the flow controller I6 on the tubing II3 corresponding to the odd-numbered fracture 5 Install the flow controller II7, and set the packer 9 in the annular space 8 of the oil casing corresponding t...

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Abstract

The invention relates to a multistage fracturing horizontal well inter-crack interval CO2 flooding oil extraction method. The method includes following steps: performing sectional fracturing on a horizontal well shaft to form multiple fracturing cracks perpendicular to the horizontal well shaft; mounting an oil pipe I and an oil pipe II in a casing in the horizontal well shaft, mounting flow controllers I at positions, corresponding to even-level cracks, of the oil pipe I, mounting flow controllers II at positions, corresponding to odd-level cracks, of the oil pipe II, and arranging a packer at a position, between the odd-level cracks and the even-level cracks, in an annular space of an oil jacket; at an initial production stage, utilizing natural energy for extraction until bottom hole pressure is lowered to bubble point pressure, and utilizing crack intervals for extraction, injecting CO2 into the oil pipe I, wherein CO2 enters the even-level cracks, and crude oil is output from the odd-level cracks and enters the oil pipe II at the same time; when oil yield is lower than economic limit yield, stopping injecting CO2. By the method, crude oil recovery rate can be increased substantially, and gas channeling can be inhibited effectively.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a CO 2 Oil flooding method. Background technique [0002] With the rapid growth of global oil demand, the objects of oil and gas exploration and development are becoming more and more complex, and the grade of reserves is getting worse and worse. Low-permeability and ultra-low-permeability reservoirs will become the main targets of oilfield development in the future. Among the new proven reserves of crude oil in my country's onshore oilfields, the proportion of low-permeability reservoirs has increased sharply. Therefore, low-permeability and tight reservoirs are gradually becoming the focus of my country's future oil and gas development. [0003] Multi-stage fractured horizontal wells are usually used to develop low-permeability oil fields, which can provide channels for oil and gas flow, thereby increasing production. However, on the one ...

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Application Information

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IPC IPC(8): E21B43/16E21B43/26
CPCE21B43/164E21B43/26
Inventor 于海洋唐蕾李芳玉程时清朱常玉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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