Profile controlling and flooding composition for high-temperature oil reservoirs with high salinity

A high-temperature, high-salt, composition technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of low oil displacement efficiency, poor temperature and salt resistance, etc.

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of poor temperature and salt resistance and low oil displacement efficiency under the high temperature and high salt conditions existing in the oil displacement agent in the prior art, and provides a high temperature and high salt oil reservoir control and displacement composition

Method used

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  • Profile controlling and flooding composition for high-temperature oil reservoirs with high salinity

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Experimental program
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Effect test

Embodiment 1

[0054] The polymer microemulsion of the present embodiment is prepared by polymerizing a reverse phase microemulsion under the action of a redox composite initiator; the reverse phase microemulsion comprises the following components in parts by weight:

[0055] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0056] b) 15 parts of emulsifier; the HLB value of the emulsifier is 6.7 (from Span 80 (that is, sorbitan monooleate) HLB value is 4.3; Tween 20 (polyoxyethylene (20EO) sorbitan monolauryl Ester) mixed with HLB value 16.7);

[0057] c) 30 parts of water-soluble monomer A; water-soluble monomer A is composed of 18 parts of acrylamide, 6 parts of sodium acrylate and 6 parts of 2-acrylamido-2-methylpropanesulfonate sodium;

[0058] d) 6 parts of temperature-resistant and salt-resistant monomers; the temperature-resistant and salt-resistant monomers are selected from oil-soluble temperature-resistant and salt-resistant monomers: octadecyl methacrylate;...

Embodiment 2

[0122] The polymer microemulsion of the present embodiment is prepared by polymerizing a reverse phase microemulsion under the action of a redox composite initiator; the reverse phase microemulsion comprises the following components in parts by weight:

[0123] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0124] b) 15 parts of emulsifier; the emulsifier HLB is 6.7 Span 40;

[0125] c) 30 parts of water-soluble monomer A; water-soluble monomer A is composed of 18 parts of acrylamide, 6 parts of sodium acrylate and 6 parts of 2-acrylamido-2-methylpropanesulfonate sodium;

[0126] d) 6 parts of temperature-resistant and salt-resistant monomers; the temperature-resistant and salt-resistant monomers are selected from oil-soluble temperature-resistant and salt-resistant monomers: octadecyl methacrylate;

[0127] e) 24 parts of water;

[0128] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, comprises the fol...

Embodiment 3

[0145] The polymer microemulsion of the present embodiment is prepared by polymerizing a reverse phase microemulsion under the action of a redox composite initiator; the reverse phase microemulsion comprises the following components in parts by weight:

[0146] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0147] b) 15 parts of emulsifier; the HLB value of the emulsifier is 6.7 (from Span 80 (that is, sorbitan monooleate) HLB value is 4.3; Tween 20 (polyoxyethylene (20EO) sorbitan monolauryl Ester) mixed with HLB value 16.7);

[0148] c) 30 parts of water-soluble monomer A; water-soluble monomer A is composed of 18 parts of acrylamide, 6 parts of sodium acrylate and 6 parts of 2-acrylamido-2-methylpropanesulfonate sodium;

[0149] d) 6 parts of temperature-resistant and salt-resistant monomers; the temperature-resistant and salt-resistant monomers are selected from oil-soluble temperature-resistant and salt-resistant monomers: octadecyl methacrylate;...

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Abstract

The invention relates to a profile controlling and flooding composition for high-temperature oil reservoirs with high salinity and an application of the composition in tertiary oil recovery of the high-temperature oil reservoirs with high salinity, and mainly aims at solving the problems of poor heat resistance and salt tolerance and low oil displacement efficiency of an oil displacement agent under the conditions of high temperature and high salinity in the prior art. The problems are well solved by virtue of the following technical scheme: the profile controlling and flooding composition for high-temperature oil reservoirs with high salinity is prepared from the following components in percentage by weight: (1) 0.01-3.0% of heat-resistant and salt-tolerant polyacrylamide microspheres, (2) 0.01-5.0% of anionic-nonionic surfactant and (3) 92.0-99.98% of injected water; and the profile controlling and flooding composition can be applied to field applications for increasing the recovery rate such as depth profile controlling, water plugging and oil displacement for tertiary oil recovery of the high-temperature oil reservoirs with high salinity.

Description

technical field [0001] The invention relates to a high-temperature and high-salt oil reservoir regulating and flooding composition and its application in the tertiary oil recovery of the high-temperature and high-salt oil reservoir. Background technique [0002] With the development of society and economy, people's demand for oil continues to increase and oil reserves decrease, and oil, as a non-renewable resource, is becoming more and more valuable. The first problem is: the contradiction between supply and demand is prominent, the demand for oil is increasing, and the number of new oil fields is less and less; the second is that there is still a large amount of crude oil left in the depleted oil reservoirs. Primary oil recovery (POR) can recover 10-25% of underground crude oil, and secondary oil recovery (SOR) can recover 15-25% of underground crude oil, that is, only 25-50% of underground crude oil can be recovered from primary oil recovery and secondary oil recovery. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08F220/56C08F220/58C08F220/06C08F220/18C08F228/02C08F4/40
CPCC09K8/584C09K8/588C08F4/40C08F220/56C08F220/06C08F220/585C08F220/1818
Inventor 宋晓芳夏燕敏蔡红许汇王兰
Owner CHINA PETROLEUM & CHEM CORP
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