A method for recovering in-situ regenerated foam oil in deep heavy oil reservoirs

A technology for heavy oil reservoirs and mining methods, applied in the field of heavy oil reservoir mining and deep heavy oil reservoir mining, can solve the problems of no economical and efficient mining methods, low cycle yield, poor economic benefits, etc., to achieve Avoid the effects of rapid degassing, high flow capacity, and high elastic energy

CN103244086BActive Publication Date: 2016-03-09PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-03-09

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Abstract

The invention provides a deep heavy oil reservoir in-situ regeneration foam oil exploiting method. The method includes: using vertical wells and / or horizontal wells to form a steam-stimulated well pattern; continuously injecting light alkane solvent into an oil reservoir through the steam-stimulated well pattern to form a first light alkane solvent slug; stopping light alkane solvent injection, and continuously injecting natural gas into the oil reservoir through the steam-stimulated well pattern to form a natural gas slug; stopping natural gas injection, continuously injecting light alkane solvent into the oil reservoir through the steam-stimulated well pattern to form a second light alkane solvent slug; shutting the wells for soaking; and opening the wells for continuous production; wherein the light alkane solvent is preferably alkane with carbon number of 5-8. By the method, foam oil flow can form in oil layers during steam-stimulated recovery, and oil production speed and recovery efficiency of the deep heavy oil reservoir can be increased effectively.
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Description

technical field

[0001] The invention relates to a mining method for heavy oil reservoirs, in particular to a mining method for deep heavy oil reservoirs, and belongs to the technical field of petroleum exploitation. Background technique

[0002] Deep heavy oil reservoirs refer to heavy oil reservoirs whose burial depth is greater than 2000m. There are a large number of reserves distributed in Turpan-Hami and other regions in my country, and the development potential is huge.

[0003] Because deep heavy oil reservoirs are buried too deep, conventional steam injection development technologies, such as steam huff and puff, steam flooding, steam-assisted gravity drainage, etc., have too much heat loss along the way during steam transportation from the wellhead to the bottom of the well. , so the thermal efficiency of steam is low, the dryness and specific volume of steam reaching the bottom of the well are low, the swept volume per unit mass of steam is small, and the developmen...

Examples

Embodiment 1

[0030] The general principle of the production method of the present invention is explained below by taking a deep heavy oil reservoir in Turpan-Hami as an example, but it should be noted that the present invention is by no means limited to the heavy oil reservoir in Turpan-Hami Oilfield. The depth of the reservoir is about 2000m, the viscosity of crude oil at the reservoir temperature is about 10000 centipoise, and the density is 0.97cm 3 / g, the original average formation pressure was 18.0MPa.

[0031] (1) Well layout parameters

[0032] Newly drilled wells adopt the vertical well determinant well pattern layout, the well spacing is 100m, and the row spacing is 100m;

[0033] (2) Select n-heptane as the light alkane solvent, the injection volume of the slug mixing system of solvent and natural gas is 200t / cycle, and the ratio of light alkane solvent to natural gas mass slug is 1:1, that is, n-heptane 100t, 100t of natural gas, the mass ratio of two light alkane solvent slu...

Embodiment 2

[0041] The general principle of the production method of the present invention is explained below by taking a deep heavy oil reservoir in Turpan-Hami as an example, but it should be noted that the present invention is by no means limited to the heavy oil reservoir in Turpan-Hami Oilfield. The depth of the reservoir is about 2500m, the viscosity of crude oil at the reservoir temperature is about 30000 centipoise, and the density is 0.98cm 3 / g, the original average formation pressure is 21.0MPa.

[0042] (1) Well layout parameters

[0043] For new drilling, the horizontal wells are arranged in rows and arrays, and the distance between the horizontal sections of adjacent horizontal wells is 200m;

[0044] (2) Select n-octane as the light alkane solvent, the injection volume of the slug mixing system of solvent and natural gas is 300t / cycle, and the ratio of light alkane solvent to natural gas mass slug is 1.2:1, that is, n-octane 163t, 136t of natural gas, the mass ratio of tw...