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Deep profile control and flooding agent having low initial viscosity and preparation method thereof

A technology of adjusting initial viscosity and flooding agent, applied in the direction of chemical instruments and methods, drilling composition, etc., can solve problems such as less researched, and achieve enhanced recovery, strong plugging ability, and good temperature resistance Effect

Active Publication Date: 2017-07-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For complex fault-block reservoirs with medium-high temperature and low permeability, the key is the issue of injectability. Therefore, the prepared control and flooding system must have lower viscosity and better injectability during injection. There are few studies on this aspect

Method used

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  • Deep profile control and flooding agent having low initial viscosity and preparation method thereof
  • Deep profile control and flooding agent having low initial viscosity and preparation method thereof
  • Deep profile control and flooding agent having low initial viscosity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A deep control and displacement agent with low initial viscosity, the content of each component is as follows:

[0038] Hydrophobic association polymer: average molecular weight 1200×10 4 , the content is 0.05wt%;

[0039] Crosslinking agent: a mixture of formaldehyde and resorcinol, wherein formaldehyde is 0.08wt% and resorcinol is 0.016wt%;

[0040] Acidity regulator: oxalic acid is used as an acidity regulator, and the content is 0.1wt%;

[0041] Antioxidant: thiourea is used as an antioxidant, and the content is 0.012wt%;

[0042] Stabilizer: divalent cobalt salt is used as a stabilizer, and the content is 0.01wt%;

[0043] The rest is water.

[0044] The preparation method of the deep control and displacement agent with low initial viscosity is obtained according to the following steps:

[0045] 1) Prepare 0.5wt% hydrophobic association polymer mother liquor, ripen at room temperature for 24 hours before use;

[0046]2) Then prepare 0.5wt% formaldehyde soluti...

Embodiment 2

[0094] A deep control and displacement agent with low initial viscosity, the content of each component is as follows:

[0095] Hydrophobic association polymer: average molecular weight 1200×10 4 , the content is 0.2wt%;

[0096] Crosslinking agent: a mixture of formaldehyde and resorcinol, wherein formaldehyde is 0.16wt% and resorcinol is 0.032wt%;

[0097] Acidity regulator: oxalic acid is used as an acidity regulator, and the content is 0.16wt%;

[0098] Antioxidant: thiourea is used as an antioxidant, and the content is 0.02wt%;

[0099] Stabilizer: divalent cobalt salt is used as a stabilizer, and the content is 0.015wt%;

[0100] The rest is water.

[0101] The preparation method of the deep control and displacement agent with low initial viscosity comprises the following steps:

[0102] 1) Prepare 0.5wt% hydrophobic association polymer mother liquor, ripen at room temperature for 24 hours before use;

[0103]2) Then prepare 0.5wt% formaldehyde solution, 0.5wt% oxal...

Embodiment 3

[0106] A deep control and displacement agent with low initial viscosity, the content of each component is as follows:

[0107] Hydrophobic association polymer: the content is 0.1wt%;

[0108] Crosslinking agent: a mixture of formaldehyde and resorcinol, wherein formaldehyde is 0.12wt%, resorcinol is 0.02wt%;

[0109] Acidity regulator: oxalic acid is used as an acidity regulator, and the content is 0.12wt%;

[0110] Antioxidant: thiourea is used as an antioxidant, and the content is 0.015wt%;

[0111] Stabilizer: divalent cobalt salt is used as a stabilizer, and the content is 0.01wt%;

[0112] The rest is water.

[0113] The deep control and displacement agent with low initial viscosity can be prepared according to the following steps:

[0114] 1) Prepare 0.5wt% hydrophobic association polymer mother liquor, ripen at room temperature for 24 hours before use;

[0115] 2) Then prepare 0.5wt% formaldehyde solution, 0.5wt% oxalic acid solution, 0.05wt% resorcinol solution, 0...

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Abstract

The invention discloses a deep profile control and flooding agent having low initial viscosity and a preparation method thereof. The deep profile control and flooding agent includes, by weight, 0.05-0.2% of a hydrophobic associated polymer, 0.08-0.16% of formaldehyde, 0.016-0.032% of resorcinol, 0.1-0.16% of oxalic acid, 0.012-0.02% of thiourea, 0.01-0.015% of a bivalent cobalt salt, and the balanced being water. A profile control and flooding system formed by the profile control and flooding agent has low initial viscosity. For low-permeation and ultralow-permeation oil reservoirs, the deep profile control and flooding system can ensure excellent injectability, and also has excellent temperature resistance, anti-shear property and thermal stability, so that a colloid has long-acting effect in the oil reservoirs. The profile control and flooding system also has strong plugging capability, profile improvement rate and oil displacement efficiency, so that a high-permeation channel is easy to plug, flow direction of the oil reservoir is changed, and subsequently injected liquid can enter a low-permeation layer, thereby increasing recovery ratio.

Description

technical field [0001] The invention relates to a deep control and displacement agent and a preparation method thereof, in particular to a deep control and displacement system applied in a low-permeability oil reservoir in a high water-cut period, and belongs to the technical field of oilfield recovery. Background technique [0002] In oilfield tertiary oil recovery technology, a low initial viscosity gel control and displacement system is used for deep control and displacement treatment of reservoirs. This system can block high-permeability channels, adjust permeability gradient, improve water absorption profile, increase swept volume and Oil efficiency, in order to achieve the purpose of enhanced oil recovery. [0003] In the water injection development of reservoirs, due to the heterogeneity of oil layer development, the existence of fractures, high permeability zones, large pores and other reasons, the corresponding oil wells of the water injection wells will be flooded ...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/588
CPCC09K8/512C09K8/588
Inventor 李晓南巢忠堂薛成刚王康月李娟刘华黄菊刘爱武朱国华
Owner CHINA PETROLEUM & CHEM CORP
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