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Method for inhibiting asphaltene deposition damage during hypotonic reservoir carbon dioxide flooding process through nanometer fluid

A nano-fluid, carbon dioxide technology, applied in chemical instruments and methods, fluid extraction, earthwork drilling, etc., can solve problems such as the inability to prevent asphaltene deposition, and achieve the effect of preventing reservoir damage and solving deposition problems.

Active Publication Date: 2016-11-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent document performs stripping treatment on the asphaltene that has been deposited on the surface of the sand grains, which belongs to the post-treatment after asphaltene deposition, and cannot prevent the deposition of asphaltene on the surface of the sand grains, and thus cannot fundamentally solve the problem of asphaltene deposition.

Method used

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  • Method for inhibiting asphaltene deposition damage during hypotonic reservoir carbon dioxide flooding process through nanometer fluid
  • Method for inhibiting asphaltene deposition damage during hypotonic reservoir carbon dioxide flooding process through nanometer fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The low-permeability core is placed in the core holder, saturated water is injected first, and then saturated oil is injected to obtain a simulated low-permeability reservoir. First inject 2PV crude oil into the simulated low-permeability reservoir to test the core permeability k1, then inject carbon dioxide and nanofluid at the same time with a volume of 2PV, and finally re-inject 2PV crude oil to test the core permeability k2.

[0029] The low-permeability core has an inner diameter of 2.54 cm, a length of 5 cm, and a permeability of 8.5 mD. The composition of the nanofluid is: SiO with a particle size of 10nm-30nm 2 The mass fraction of nanoparticles is 0.5%, the mass fraction of anionic surfactant is 0.1%, and the balance is water. The anionic surfactant is sodium petroleum sulfonate, the injection volume of carbon dioxide is 2PV, the injection volume of nanofluid is 0.1PV, and the injection velocity of nanofluid is 0.5m / d.

Embodiment 2

[0031] As described in Example 1, the difference is:

[0032] The inner diameter of the low-permeability rock core is 2.54cm, the length is 5cm, and the permeability is 8.3mD. The composition of the nanofluid is: SiO with a particle size of 10nm-30nm 2 The mass fraction of nanoparticles is 0.05%, the mass fraction of anionic surfactant is 0.5%, and the balance is water. The anionic surfactant is petroleum sodium carboxylate, the injection volume of carbon dioxide is 2PV, the injection volume of nanofluid is 0.1PV, and the injection velocity of nanofluid is 0.8m / d.

Embodiment 3

[0034] The low-permeability core is placed in the core holder, saturated water is injected first, and then saturated oil is injected to obtain a simulated low-permeability reservoir. First inject 2PV crude oil into the simulated low-permeability reservoir to test the core permeability k1, then alternately inject carbon dioxide and nanofluid, first inject carbon dioxide with a volume of 2PV, and finally re-inject 2PV crude oil to test the core permeability k2.

[0035] The inner diameter of the low-permeability core is 2.54cm, the length is 5cm, and the permeability is 8.4mD. The composition of the nanofluid is: SiO with a particle size of 10nm-30nm 2 The mass fraction of nanoparticles is 0.1%, the mass fraction of anionic surfactant is 0.2%, and the balance is water. The anionic surfactant is sodium petroleum sulfonate, the injection volume of carbon dioxide is 2PV, the injection volume of nanofluid is 0.025PV, the volume ratio of carbon dioxide and nanofluid is 80:1, and the...

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Abstract

The present invention relates to a method for inhibiting the asphaltene deposition damage during a hypotonic reservoir carbon dioxide flooding process through a nanometer fluid. The method comprises: simultaneously injecting carbon dioxide and a nanometer fluid into a hypotonic oil reservoir or alternatively injecting carbon dioxide and a nanometer fluid into a hypotonic oil reservoir. According to the present invention, through the injection of the nanometer fluid, the nanoparticles in the nanometer fluid can effectively adsorb asphaltene so as to prevent the damage on the reservoir due to the deposition of the asphaltene on the sand.

Description

technical field [0001] The invention relates to a method for suppressing asphaltene deposition damage in the process of carbon dioxide flooding by nanofluid, and belongs to the technical field of reservoir protection. Background technique [0002] In recent years, carbon dioxide flooding technology has become a hotspot in the research and application of enhanced oil recovery because of its unique oil displacement mechanism. However, in the process of CO2 flooding, the dissolution of CO2 in crude oil will lead to the precipitation of colloidal asphaltene components in asphaltenic crude oil, and the precipitated colloidal asphaltenes may be adsorbed or deposited on the surface of rock sand grains, causing reservoir damage , leading to changes in rock surface wettability or formation plugging, and even seriously affect production. [0003] Chinese patent document CN105315981A (application number: 201410313270.8) discloses a chemical synergist for heavy oil thermal recovery and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524E21B43/16
CPCC09K8/524C09K2208/10E21B43/164
Inventor 鹿腾李兆敏张兴鲁李健胡伟毅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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