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Chemical oil displacing method for oil reservoir after polymer oil displacement

A chemical flooding and polymer technology, applied in chemical instruments and methods, drilling composition, earthwork drilling and other directions, can solve the problems of single technical effect, complex oil displacement mechanism, low oil saturation, etc. The effect of recovery

Active Publication Date: 2018-09-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the low saturation of remaining oil and complicated oil displacement mechanism after polymer flooding in the reservoir, the relevant technology only injects one system of substances into the reservoir, and the technical effect produced by it is single and limited, and cannot improve oil recovery well. yield

Method used

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  • Chemical oil displacing method for oil reservoir after polymer oil displacement
  • Chemical oil displacing method for oil reservoir after polymer oil displacement
  • Chemical oil displacing method for oil reservoir after polymer oil displacement

Examples

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Embodiment 1

[0099] The embodiment of the present invention provides a chemical flooding method for oil reservoir after polymer flooding, and evaluates the experimental results of the chemical flooding method. The chemical flooding method is realized through the following steps:

[0100]The simulated reservoir is three layers of heterogeneous cores connected in parallel, the gas permeability is 500, 2000, 4000mD, the height is 2.0, 4.5, 1.8cm, and the length and width are 30, 4.5cm. The simulated reservoir needs to be pretreated before chemical flooding after polymer flooding. The pretreatment method is to flood the simulated reservoir with water to 95% water cut at 45°C (with no back pressure at the core outlet). %, and then inject 0.57PV of partially hydrolyzed polyacrylamide (degree of hydrolysis 21%, molecular weight 16 million, concentration 0.1%), followed by water flooding to 98% water content.

[0101] The chemical flooding after polymer flooding is carried out on the pretreated s...

Embodiment 2

[0130] The embodiment of the present invention provides a chemical flooding method for oil reservoir after polymer flooding, and evaluates the experimental results of the chemical flooding method. The chemical flooding method is realized through the following steps:

[0131] The simulated reservoir is three layers of heterogeneous cores connected in parallel, the gas permeability is 500, 2000, 4000mD, the height is 2.0, 4.5, 1.8cm, and the length and width are 30, 4.5cm. Before chemical flooding after polymer flooding in the simulated reservoir, the simulated reservoir needs to be pretreated. The pretreatment method is to flood the simulated reservoir with water at 45°C to a water cut of 95%, and then inject 0.57PV of partially hydrolyzed polyacrylamide (The degree of hydrolysis is 21%, the molecular weight is 16 million, and the concentration is 0.1%), followed by water flooding to 98% water content.

[0132] The chemical flooding after polymer flooding is carried out on the...

Embodiment 3

[0169] The embodiment of the present invention provides a chemical flooding method for oil reservoir after polymer flooding, and evaluates the experimental results of the chemical flooding method. The chemical flooding method is realized through the following steps:

[0170] The simulated reservoir is three layers of heterogeneous cores connected in parallel, the gas permeability is 500, 2000, 4000mD, the height is 2.0, 4.5, 1.8cm, and the length and width are 30, 4.5cm. Before chemical flooding after polymer flooding in the simulated reservoir, the simulated reservoir needs to be pretreated. The pretreatment method is to flood the simulated reservoir with water at 45°C to a water cut of 95%, and then inject 0.57PV of partially hydrolyzed polyacrylamide (The degree of hydrolysis is 21%, the molecular weight is 16 million, and the concentration is 0.1%), followed by water flooding to 98% water content.

[0171] The chemical flooding after polymer flooding is carried out on the...

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Abstract

The invention discloses a chemical oil displacing method for an oil reservoir after the polymer oil displacement, which belongs to the technical field of the oil field oil displacement. The chemical oil displacing method comprises the following steps: injecting a first substance into a target oil reservoir, and sealing an advantageous permeable channel of the target oil reservoir; injecting a second substance into the target oil reservoir to pre-adsorb the target oil reservoir; injecting a third substance into the target oil reservoir to adjust an adsorption profile of different permeable layers of the target oil reservoir, enlarge an involved volume and improve the oil displacing efficiency; and injecting a fourth substance into the target oil reservoir to prevent the third substance frombeing diluted. According to embodiments of the invention, the first substance, the second substance, the third substance and the fourth substance are successively injected into the oil reservoir at different phases, so that the substances injected at different phases can be cooperated with one another to have a synergistic effect, an oil displacing mechanism combining the blocking, controlling and displacing of the oil reservoir after the polymer displacement can be formed, and by adopting the embodiments of the invention, the recovery ratio of the oil reservoir after the polymer displacementcan be effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil field flooding, in particular to a chemical flooding method for oil reservoir polymer flooding. Background technique [0002] When the development of large domestic oilfields enters the middle and later stages, it is usually necessary to sequentially adopt water flooding (water flooding) and polymer flooding (polymer flooding) to drive oil reservoirs in order to increase oil recovery in oil layers. However, after water flooding and polymer flooding, the average recovery degree of the oil reservoir is about 50%, that is to say, nearly half of the geological reserves still remain underground. Therefore, it is necessary to further drive oil after polymer flooding to Enhance oil recovery in oil reservoirs. [0003] In related technologies, after polymer flooding, the method of injecting foam, microorganism, gel, ternary and other substances into the reservoir is often used to improve the oil displacement...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/508C09K8/584C09K8/588C09K8/594C09K8/60C09K8/88C09K8/94E21B43/22
CPCC09K8/5083C09K8/512C09K8/584C09K8/588C09K8/594C09K8/604C09K8/887C09K8/94E21B43/16
Inventor 程杰成伍晓林韩培慧高淑玲曹瑞波刘宏生
Owner PETROCHINA CO LTD
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