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Heavy oil recovery method

A production method and heavy oil technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of low recovery rate of reverse nine-point well pattern, so as to improve production degree and recovery rate , to solve the effect of low recovery

Active Publication Date: 2022-06-03
PETROCHINA CO LTD
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a heavy oil recovery method to solve the problem of low recovery of reverse nine-point well pattern in the prior art

Method used

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Embodiment Construction

[0025] In the present invention, unless otherwise stated, the orientation words used such as "upper, lower" are usually directed to the accompanying drawings

[0031] The technical solution of this embodiment is applied to disconnect the first vertical well 10 from the gas supply device, so as to connect the first vertical well 10 to the gas supply device.

[0034] In this embodiment, in the steam injection cycle of the gas supply device, the daily steam injection volume of the gas supply device is 2 to 3 tons per meter. This

[0035] In this embodiment, the preset length h and the thickness H of the oil layer 40 satisfy 0.5H≤h≤0.6H. Thus, the above

[0036] Specifically, after the second vertical well 20 is disconnected from the oil production device, the upper end of the second vertical well 20 is blocked.

[0039] In this embodiment, the carbon dioxide gas injection amount of the gas supply device is 1.5 to 2.5 tons per meter. Specifically, if the oil layer 40

[0043] It sho...

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Abstract

The invention provides a heavy oil recovery method. The heavy oil production method is applicable to the reverse nine-point well pattern, which includes at least one well layout unit, each well layout unit includes the first vertical well, the second vertical well and the third vertical well, the first vertical well and the gas supply device Connected, the second vertical well and the third vertical well are connected to the oil production device, the heavy oil production method includes: step S1: disconnect the first vertical well from the gas supply device, so as to connect the first vertical well to the oil production device; step S2: Disconnect the second vertical well from the oil production device, and seal the perforation of the second vertical well with a preset length h along the direction from the oil top to the oil bottom of the oil layer; Step S3: Connect the gas supply device to the second vertical well , the gas supply device injects steam into the second vertical well, and the steam is discharged into the oil layer from the perforation of the second vertical well to drive the crude oil in the oil layer into the first vertical well and / or the third vertical well. The invention solves the problem of low recovery rate of reverse nine-spot well pattern in the prior art.

Description

Heavy oil recovery method technical field The present invention relates to the technical field of petroleum exploitation, specifically, relate to a kind of heavy oil exploitation method. Background technique [0002] At present, for the exploitation of heavy oil and tank heavy oil, steam injection thermal recovery is usually adopted. Generally, steam injection thermal recovery It is steam huff and puff. However, after a certain period of steam huff and puff production of heavy oil forms thermal communication, only each oil well can be produced. The crude oil in the oil layer near the point, a large number of dead oil areas are left between the wells, resulting in low recovery. In order to improve recovery factor, in prior art, adopt steam flooding exploitation technology to improve recovery after steam huff and puff rate of succession techniques. Among them, steam flooding is the continuous injection of high-dryness steam into the oil layer from the injection well. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/30
CPCE21B43/24E21B43/30Y02E10/10
Inventor 董宏王倩于庆森高成果杨柳
Owner PETROCHINA CO LTD
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