Blocking remover and preparation method thereof

A technology of plugging remover and active agent, which is applied in the field of bio-nano-based plugging remover and its preparation for newly put into production trans-injection wells. Time, the effect of avoiding secondary pollution

Active Publication Date: 2020-04-17
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the current pretreatment agent have the following limitations and deficiencies: 1) anionic surfactants are not resistant to high salinity, if the water-sensitive critical salinity of the reservoir is higher, or the calcium and magnesium ion content is higher, then This technique cannot be implemented; 2) the interfacial tension of most pretreatment agents is at 10 1 About mN/m, it has a certain effect on high permeability, medium to high permeability and other reservoirs, but the treatment effect is not ideal for medium to low and low permeability transfer injection wells, and sometimes even causes secondary damage (mixing of two pretreatment agents 3) Cationic polymers or cationic surfactants are adsorbed on the surface of formation rock minerals, and long-te...

Method used

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  • Blocking remover and preparation method thereof
  • Blocking remover and preparation method thereof
  • Blocking remover and preparation method thereof

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preparation example Construction

[0051] On the other hand, the embodiments of the present invention provide the above-mentioned preparation method of the plugging agent, and the preparation method of the plugging agent includes the following steps:

[0052] 1) adding the biosurfactant fermentation broth, emulsifier and co-solvent into the reaction vessel, heating up and stirring evenly;

[0053] 2) Add anti-scaling agent and anti-swelling agent to the homogeneously mixed solution prepared in step 1), stir and dissolve;

[0054] 3) Continue to heat up the homogeneously mixed solution prepared in step 2), then add hydrophobic nano-silica into the reaction vessel, and stir evenly to obtain the blocking release agent.

[0055] In the embodiment of the present invention, the temperature increase in step 1) is to increase the temperature to 30°C-80°C, and keep the temperature for 1-2h after the temperature rise; preferably, the temperature increase rate is 1°C / min;

[0056] In the embodiment of the present inventi...

Embodiment 1

[0070] With Potsdam bacillus biological lipopeptide surfactant fermentation liquid 40g, emulsifier α-olefin sulfonate sodium (C14-C18 olefin sulfonate and C14-C16 olefin are mixed in a ratio of 1:1 by mass ratio) 3g, Add 15g of isopropanol to the reaction kettle in turn, raise the temperature to 40°C, the heating rate is 1°C / min, keep warm for 1h, and stir evenly; add 3.5g of EDTA-disodium and 3g of sodium citrate to the uniformly mixed above solution , compound amino acid (glutamic acid, tryptophan, aspartic acid and lysine are mixed in the ratio of mass ratio 1:1:1:1) 3g, stir to make it dissolve and mix homogeneously; Add nitric acid in the mixed solution Potassium 5g, potassium fulvic acid 2.8g, stir to dissolve completely, until uniformly mixed; finally raise the temperature to 80°C, add 3g of aminosilane-modified hydrophobic nano-silica, stir at 6000rpm for 18 minutes until uniform, Obtained biological nano plugging agent A (SWJDA).

Embodiment 2

[0072] With Potsdam bacillus biological lipopeptide surfactant fermented liquid 46g, emulsifying agent α-olefin sulfonate sodium (C14-C18 olefin sulfonate sodium and C14-C16 olefin sulfonate sodium are mixed in a ratio of 1:1 by mass ratio ) 2.9g, n-butanol 18g, were added to the reaction kettle in turn, heated up to 38°C, the heating rate was 1°C / min, kept warm for 1.2hr, stirred evenly; added 4g of EDTA-disodium to the above-mentioned solution that was mixed uniformly, Sodium citrate 2g, compound amino acid 5g (glutamic acid, tryptophan, aspartic acid and lysine are mixed in the ratio of mass ratio 1:1:1:1), stir to make it dissolve and mix evenly; Add 4g of potassium nitrate and 4g of potassium fulvic acid into the solution, stir to dissolve completely, and mix evenly; finally, heat up to 80°C, add 3.5g of hydrophobic nano-silica modified by aminosilane, and stir at 5000rpm for 28 Minutes until uniform, the existing bio-nano plugging agent B (SWJDB).

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Abstract

The invention discloses a blocking remover and a preparation method thereof. The blocking remover comprises following raw materials: Brevibacillus borstelensis biosurfactant fermentation liquid and hydrophobic nano silicon dioxide, and an emulsifier, an anti-scaling agent, an anti-swelling agent and a cosolvent can also be contained. The preparation method of the blocking remover comprises the following steps: firstly, adding the biosurfactant fermentation liquid, the emulsifier and the cosolvent into a reaction container, heating, and uniformly stirring; secondly, adding the anti-scaling agent and the anti-swelling agent into the solution obtained in the former step, and stirring for dissolving; and finally, continuously heating a prepared solution, adding hydrophobic inorganic nanoparticles into the reaction container, and uniformly stirring. The blocking remover has low oil-water interfacial tension, can effectively strip and emulsify residual oil and colloidal asphaltene deposits in a medium-low permeable layer to form a low-viscosity emulsion, remove organic blocking, resist hypersalinity, can be completely degraded by microorganisms, and is green and environment-friendly.

Description

technical field [0001] This article relates to oil and gas recovery technology, specifically a plugging remover and its preparation method, especially a bionano-based plugging remover and its preparation method for newly put into production trans-injection wells. Background technique [0002] Water injection has become the main way for oilfields to replenish formation energy, and most water injection wells are transfer injection wells adjusted by oil wells, there will be a certain amount of residual oil and deposited colloidal The layer contains clay minerals, and there is a problem of clay hydration swelling. At present, when oilfields perform pretreatment in transfer wells, since the surfactants used to treat residual oil are generally anionic, the anti-swelling agents and surfactants used to treat water-sensitive clay minerals are cationic polymers or surfactants. Treatment agents cannot be mixed and need to be prepared and injected separately. This makes the current pr...

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/524C09K2208/10
Inventor 冯青李啸南佘跃惠黄子俊张凡曾鸣杨慰兴仲晔蔡依娜魏志鹏樊爱彬高杰李学军苏三宝董浩冯阳阳曾琦王子琛翁雪
Owner CHINA NAT OFFSHORE OIL CORP
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