Clay stabilizing agent suitable for low-permeability oil pool

A clay stabilizer and low permeability technology, which is applied in the field of clay stabilizers, can solve the problems of high molecular weight of clay stabilizers, blockage of pore throats, and degradation of injected water quality, so as to facilitate on-site application, prevent clay expansion, and inhibit clay expansion Effect

Inactive Publication Date: 2010-06-02
DAQING GASOLINEEUM INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of clay stabilizer has a large molecular weight. Although it can achieve the purpose of anti-swelling and stability, it will cause great damage to low-permeability reservoirs and block pore throats.
In addition, when the clay stabilizer with a large molecular weight is mixed with the oilfield reinjection sewage containing HPAM (polyacrylamide), the HPAM in the oilfield reinjection sewage is precipitated, causing the injection water to be turbid, reducing the quality of the injection water, and also causing a rise in water injection pressure. Problems such as high water wells and insufficient injection of water wells

Method used

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  • Clay stabilizing agent suitable for low-permeability oil pool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] at 10m 3 Add 5.7 tons of 70% liquid 2-hydroxyethyltrimethylammonium chloride in the mixing tank, then add 4.3 tons of tap water, mix evenly, and filter to obtain 10 tons of clay stabilizer products with a solid content of 40%.

[0030] Wherein 2-hydroxyethyltrimethylammonium chloride is commonly called as choline chloride, and 70% liquid 2-hydroxyethyltrimethylammonium chloride is a commercially available industrial grade product.

[0031] During use, be mixed with the clay stabilizer solution that contains the above-mentioned clay stabilizer product and be respectively 2%, 3%, 4%, 5%, 6% (mass percentage) with HPAM oil field reinjection sewage, its anti-swelling rate is shown in the table 1.

[0032] The anti-swelling rate is determined according to the evaluation method of clay stabilizer for water injection in SY / T 5971-94.

[0033] Table 1 embodiment 1 clay stabilizer solution anti-swelling rate

[0034] Concentration / %

2

3

4

5

...

Embodiment 2

[0038] at 10m 3 Add 5 tons of 20% potassium chloride solution to the mixing tank; then add 4.3 tons of 70% liquid 2-hydroxyethyltrimethylammonium chloride, then add 0.7 tons of tap water, mix well, and filter to obtain a solid content of 40%. 10 tons of clay stabilizer.

[0039] 20% potassium chloride solution: commercially available industrial grade solid potassium chloride is prepared by adding tap water.

[0040] With reference to the usage method of Example 1, the clay stabilizer solutions containing the above-mentioned clay stabilizer are respectively prepared as 2%, 3%, 4%, 5%, 6% (mass percentage), and its anti-swelling rate is shown in Table 2.

[0041] Table 2 embodiment 2 clay stabilizer solution anti-swelling rate

[0042] Concentration / %

2

3

4

5

6

Anti-expansion rate / %

67.9

80.6

88.6

91.4

92.5

[0043] As can be seen from Table 2, the clay stabilizer solution compounded with inorganic salt ...

Embodiment 3

[0046] at 10m 3 Add 7.0 tons of 27% ammonium chloride solution in the mixing tank; add 3.0 tons of 70% liquid 2-hydroxyethyltrimethylammonium chloride, mix well, and filter to obtain 10 tons of clay stabilizer with a solid content of 40% .

[0047] 27% ammonium chloride solution: commercially available industrial grade solid ammonium chloride is prepared by adding tap water.

[0048] With reference to the usage method of Example 1, the clay stabilizer solutions that contain the above-mentioned clay stabilizer are respectively prepared as 2%, 3%, 4%, 5%, 6% (mass percentage), and its anti-swelling rate is shown in Table 3.

[0049] Table 3 embodiment 3 clay stabilizer solution anti-swelling rate

[0050] Concentration / %

[0051] As can be seen from Table 3, the anti-expansion rate of the product of Example 3 compounded with ammonium chloride can also meet the anti-expansion requirements. There is also synergy between ammonium chloride and 2-hydroxyethyltrimethylamm...

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Abstract

The invention discloses a clay stabilizing agent suitable for low-permeability oil pool, which comprises the following materials in percentage by weight: 0.8-98% of (2-hydroxyethyl)trimethylammonium chloride, 0-20% of inorganic salt containing ammonium or potassium ions, and the balance of tap water or oil field return water. The clay stabilizing agent effectively prevents the clay from swelling, can achieve the anti-swelling rate more than 90 percent, has good compatibility with HPAM-containing oil field return water without generating floccules and low damage rate of an oil field and is suitable for the low-permeability oil pool developed by infusing the HPAM-containing oil field return water.

Description

Technical field: [0001] The invention relates to a clay stabilizer used in clay-containing low-permeability oil reservoirs. Background technique: [0002] Low permeability reservoirs during oilfield development, often containing clay minerals, are water sensitive. Among them, clay minerals expand, disperse, migrate, and block pore throats, which greatly reduces the original low permeability, which not only affects the productivity of oil wells, but also has a very bad and irreversible impact on the later development of oil fields. [0003] Injecting clay stabilizers is an effective method to protect water-sensitive reservoirs. The cationic polymer clay stabilizer widely used in oil fields in recent years has high positive charge density, less dosage and long-lasting effect. However, this kind of clay stabilizer has a large molecular weight. Although it can achieve the purpose of anti-swelling and stabilization, it will cause great damage to low-permeability reservoirs and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/575
Inventor 李柏林程杰成牛瑞霞
Owner DAQING GASOLINEEUM INST
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