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A method to improve low permeability reservoir co 2 driving efficiency

A low-permeability, high-permeability technology, applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as low displacement efficiency, and achieve the effect of improving efficiency, reducing gas mobility, and having broad application prospects.

Active Publication Date: 2016-10-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The object of the present invention is to solve the difficult problem existing in above-mentioned prior art, provide a kind of method that improves low permeability reservoir CO 2 The method of flooding efficiency, by changing the gas displacement direction to expand the gas swept volume, thereby increasing the CO 2 flooding efficiency and reduce CO in low permeability reservoirs 2 During the flooding process, the gas mobility can be improved, the gas drive efficiency can be improved, and the CO in low permeability reservoirs can be solved. 2 The problem of low displacement efficiency caused by gas rushing along hyperpermeable parts

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  • A method to improve low permeability reservoir co <sub>2</sub> driving efficiency

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[0024] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0025] The principle of the inventive method is as Figure 1 to Figure 4 Shown: Figure 1 to Figure 4 The dark color in represents the low-permeability layer (that is, the low-permeability part), and the light color represents the hyper-permeability layer (that is, the high-permeability part). figure 1 Shown is low permeability heterogeneous reservoir injected with CO 2 During the process, the gas rushes along the hyperpermeable part, reducing the displacement efficiency. figure 2 Shown is the pre-water slug, sodium silicate aqueous solution main slug, rear water slug, and sodium silicate aqueous solution main slug (pre-water slug and post-water slug) injected during the water-gas alternation process. The plugs are protective slugs, which temporarily isolate CO 2 And the purpose of sodium silicate aqueous solution, the amount is very small, can be ignored relativ...

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Abstract

The present invention provides a method for improving CO in low-permeability reservoirs 2 The method of flooding efficiency belongs to the field of petroleum development. The method described by post-injected CO 2 It reacts with the sodium silicate aqueous solution injected earlier to form an inorganic gel, thereby inhibiting CO 2 Channeling along the high-permeability parts forces the gas to divert to the low-permeability parts, thereby enlarging the swept volume of the gas and increasing CO2 in low-permeability reservoirs. 2 effect on driving efficiency. The method of the invention reduces CO in low permeability reservoirs 2 The gas mobility during the flooding process improves the gas drive efficiency and solves the problem of CO in low-permeability reservoirs. 2 The problem of low displacement efficiency caused by gas rushing along high-permeability parts; the method of the present invention is suitable for improving CO in low-permeability heterogeneous reservoirs. 2 The oil displacement effect has a relatively broad application prospect under the current situation that the development proportion of low permeability reservoirs is increasing year by year.

Description

technical field [0001] The invention belongs to the field of petroleum development, and in particular relates to a method for improving CO in low-permeability reservoirs. 2 way to drive efficiency. Background technique [0002] At present, my country's oilfield development is gradually developing towards hard-to-produce low-permeability and heavy oil reservoirs, and the general permeability of low-permeability reservoirs is 10×10 -3 μm 2 -50×10 -3 μm 2 , some reservoirs have a permeability of 1×10 -3 μm 2 -10×10 -3 μm 2 , even lower than 1×10 -3 μm 2 , water flooding is difficult to develop, and gas flooding is one of the effective measures to develop low permeability reservoirs. Compared with air flooding and nitrogen flooding, CO 2 The miscible pressure of flooding is low, and it is easy to form miscibility with crude oil. 2 Emphasis on emission reduction, more and more CO 2 Injected into the ground to enhance oil recovery while reducing emissions. The disadv...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16
Inventor 王海波马涛谭中良卢刚
Owner CHINA PETROLEUM & CHEM CORP
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