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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

[0044] Preparation of amphoteric ion monomer water-soluble modified starch, the specific preparation process is: Weigh 100g of cornstarch, add deionized water, gelatinize at 60°C for 30min, add 5g of potassium persulfate after nitrogen gas for 30min, weigh 100g of acrylamide ( AM), 170g zwitterionic monomer (DAPS) was dissolved in deionized water and then transferred to the gelatinized starch reactor. The total mass concentration of the monomer was 25%. After reacting at 60°C for 5h, a colloidal solid was obtained, which was washed with acetone A white precipitate was obtained. The white precipitate was dried at 70°C for 20 h and crushed to obtain the final product.

Embodiment 2

[0046] Preparation of anionic monomer water-soluble modified starch, the specific preparation process is: Weigh 100g mung bean starch, add deionized water, gelatinize at 65°C for 40min, add 2.5g sodium persulfate after 15min of nitrogen gas, and weigh 50g acrylamide ( AM), 100g of anionic monomer (AMPS) was dissolved in deionized water and then transferred to the gelatinized starch reactor, the total mass concentration of the monomer was 20%, after reacting at 70°C for 6h, a colloidal solid was obtained, which was washed with acetone to obtain white precipitate. The white precipitate was dried at 80° C. for 16 hours and then pulverized to obtain an anionic monomer water-soluble modified starch.

Embodiment 3

[0048] Prepare cationic monomer water-soluble modified starch. The specific preparation process is as follows: Weigh 100g of wheat starch and add deionized water to gelatinize at 70°C for 50min. (AM), 40g of cationic monomer (DAC) was dissolved in deionized water and then transferred to the gelatinized starch reactor. Washing yielded a white precipitate. The white precipitate was dried at 75° C. for 24 hours and then pulverized to obtain a cationic monomer water-soluble modified starch.

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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 in particular relates to an oil and gas layer protection material and its preparation method and application. Background technique [0002] Shielding temporary plugging to protect 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 multi-pressure formations in open hole sections, that is, to use two factors that damage oil and gas layers during drilling into oil and gas layers. The unfavorable factors (pressure difference and drilling fluid solid phase particles) are converted into favorable factors to protect oil and gas layers, and the purpose of reducing the damage to oil and gas layers caused by drilling fluid, cement slurry, pressure difference and soaking time is achieved. [0003] The basic idea of ​​shielding temporary plugging protection oil and gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/516C09K8/514C08B31/00C08F251/00C08F228/02C08F220/56
CPCC09K8/516C09K8/514C08B31/003C08F251/00C08B30/18C08F220/56C08F228/02
Inventor 王晨赵凯强杨超尹泽群张志智孙潇磊
Owner CHINA PETROLEUM & CHEM CORP
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