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Hydrocarbon reservoir protection material and preparation method and application thereof

A technology for protecting materials and oil and gas formations, applied in the direction of chemical instruments and methods, drilling compositions, etc.

Pending Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on homogeneously distributed polydisperse starch microspheres

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] To prepare water-soluble modified starch with zwitterionic monomer, the specific preparation process is as follows: Weigh 100g corn starch and add deionized water to gelatinize at 60℃ for 30min, bubbling in nitrogen for 30min, add 5g potassium persulfate, and weigh 100g acrylamide ( AM), 170g zwitterionic monomer (VPPS) is added to deionized water to dissolve and transferred to the gelatinized starch reactor. The total mass concentration of the monomer is 25%. After reacting at 60℃ for 5h, a colloidal solid is obtained, which is washed with acetone. A white precipitate was obtained. The white precipitate was dried at 70°C for 20 hours and then crushed to obtain the final product.

Embodiment 2

[0048] To prepare anionic monomer water-soluble modified starch, the specific preparation process is: weigh 100g mung bean starch, add deionized water and gelatinize at 65℃ for 40min, bubbling in nitrogen for 15min, add 2.5g sodium persulfate, respectively weigh 50g acrylamide ( AM), 100g of anionic monomer (FA) is added to deionized water to dissolve and transferred to the gelatinized starch reactor. The total monomer concentration is 20%. After reacting at 70℃ for 6 hours, a colloidal solid is obtained, which is washed with acetone. White precipitate. The white precipitate was dried at 80°C for 16 hours and then pulverized to obtain anionic monomer water-soluble modified starch.

Embodiment 3

[0050] To prepare cationic monomer water-soluble modified starch, the specific preparation process is: weigh 100g wheat starch, add deionized water and gelatinize at 70℃ for 50min, bubbling in nitrogen for 45min, add 2.4g ammonium persulfate, and weigh 20g acrylamide respectively (AM), 40g cationic monomer (DBC) was dissolved in deionized water and transferred to the gelatinized starch reactor. The total mass concentration of the monomer was 15%. After reaction at 75℃ for 5.5h, a colloidal solid was obtained. Use acetone Washing to obtain a white precipitate. The white precipitate was dried at 75°C for 24 hours and then crushed to obtain the cationic monomer water-soluble modified starch.

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PUM

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Abstract

The invention discloses a hydrocarbon reservoir protection material as well as a preparation method and application thereof. The hydrocarbon reservoir protection material comprises starch-containing microspheres and water-soluble modified starch, based on the total weight of the hydrocarbon reservoir protection material, the content of the starch-containing microspheres is 40-80 wt%, the content of the water-soluble modified starch is 20-60 wt%, and the preparation method comprises a step of uniformly mixing the starch-containing microspheres with the water-soluble modified starch to obtain the hydrocarbon reservoir protection material. The invention also relates to an application of the starch microspheres in a hydrocarbon reservoir protection temporary plugging agent. The hydrocarbon reservoir protection material has the advantages of simple components, efficient performance, environmental friendliness, low cost and the like.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas layer protection, and specifically relates to an oil and gas layer protection material and a preparation method and application thereof. Background technique [0002] Shielding temporary plugging protection oil and gas layer drilling technology (referred to as shielding temporary plugging technology) is mainly used to solve the problem of protecting oil and gas layers in open-hole sections with multiple pressure strata, that is, using two factors that damage the oil and gas layers during drilling. The unfavorable factors (pressure difference and solid particles of drilling fluid) are transformed into favorable factors for protecting oil and gas reservoirs, so as to reduce the damage to oil and gas reservoirs by drilling fluid, cement slurry, pressure difference and intrusion time. [0003] The basic idea of ​​shielding temporary plugging to protect the oil and gas layer drilling technology is to use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/514C08F251/00C08F220/56C08F226/06C08F222/02C08F220/34C08F226/02C08B31/12
CPCC09K8/514C09K8/035C08F251/00C08B31/12C08F220/56C08F226/06C08F222/02C08F220/34C08F226/02
Inventor 王晨赵凯强杨超赵林韩洁
Owner CHINA PETROLEUM & CHEM CORP
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