A kind of seawater-based fracturing fluid and its preparation method and application

A seawater and base pressure technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problem that the temperature resistance is difficult to meet the application requirements and improve, and achieve good sand-carrying performance and good breaking capacity. Adhesive properties, the effect of improving high temperature resistance

Active Publication Date: 2021-04-23
SHANGHAI BRANCH CHINA OILFIELD SERVICES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, for some oil and gas fields with relatively high temperatures, the temperature resistance of the above-mentioned seawater-based fracturing fluids is still difficult to meet the application requirements and needs to be further improved

Method used

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  • A kind of seawater-based fracturing fluid and its preparation method and application
  • A kind of seawater-based fracturing fluid and its preparation method and application
  • A kind of seawater-based fracturing fluid and its preparation method and application

Examples

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Embodiment 1

[0051] This embodiment provides a seawater-based fracturing fluid, including a base fluid and a cross-linking agent accounting for 0.1% by weight of the base fluid, and the base fluid includes the following components in weight percentage:

[0052] Seawater-based fracturing fluid thickener 0.8%, performance regulator 0.6%, chelating agent 0.8%, high temperature stabilizer 0.2%, anti-swelling agent 1%, drainage aid 0.04%, gel breaker 0.1%, the balance is seawater ;

[0053] Wherein, the seawater-based fracturing fluid thickener is the high-temperature-resistant seawater-based fracturing fluid thickener disclosed in Example 1 of CN 108485640A;

[0054] The performance regulator is prepared by the following method: keep the temperature in the reactor at 30°C, add 310g of deionized water, 125g of acrylamide, 50g of sodium acrylate, 5g of allyloxysodium dodecyl carboxylate and 10g of 2-Acrylamido sodium dodecylsulfonate, stir until dissolved, then pass 99.999% high-purity nitrogen...

Embodiment 2

[0064] This embodiment provides a seawater-based fracturing fluid, including a base fluid and a crosslinking agent accounting for 0.14% by weight of the base fluid, and the base fluid includes the following components in weight percentage:

[0065]Seawater-based fracturing fluid thickener 1.2%, performance regulator 0.4%, chelating agent 0.5%, high temperature stabilizer 0.3%, anti-swelling agent 0.8%, drainage aid 0.02%, gel breaker 0.3%, the balance is seawater ;

[0066] Wherein, the seawater-based fracturing fluid thickener is the high-temperature resistant seawater-based fracturing fluid thickener disclosed in Example 2 of CN 108485640A;

[0067] The performance modifier is prepared by the following method: keep the temperature in the reactor at 30°C, add 236g of deionized water, 120g of acrylamide, 32g of sodium acrylate, 8g of allyloxysodium dodecyl carboxylate and 4g of Sodium 2-acrylamido dodecylsulfonate, stirred until dissolved, then passed 99.999% high-purity nitr...

Embodiment 3

[0077] This embodiment provides a seawater-based fracturing fluid, including a base fluid and a cross-linking agent accounting for 0.12% by weight of the base fluid, and the base fluid includes the following components in weight percentage:

[0078] Seawater-based fracturing fluid thickener 1%, performance regulator 0.5%, chelating agent 1%, high temperature stabilizer 0.4%, anti-swelling agent 0.5%, drainage aid 0.06%, gel breaker 0.2%, the balance is seawater ;

[0079] Wherein, the seawater-based fracturing fluid thickener is the high-temperature resistant seawater-based fracturing fluid thickener disclosed in Example 3 of CN 108485640A;

[0080] The performance regulator is prepared by the following method: keep the temperature in the reactor at 30°C, add 180g of deionized water, 84g of acrylamide, 27g of sodium acrylate, 4.5g of allyloxydodecyl sodium carboxylate and 4.5g 2-acrylamido sodium dodecylsulfonate, stir until dissolved, then pass 99.999% high-purity nitrogen t...

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Abstract

The invention provides a seawater-based fracturing fluid, a preparation method and application thereof. The seawater-based fracturing fluid includes a base fluid and a cross-linking agent accounting for 0.1-0.14% by weight of the base fluid; the base fluid includes a seawater-based fracturing fluid thickener, a chelating agent, a high-temperature stabilizer, and an antiswelling agent , drainage aid, performance modifier and seawater, the seawater-based fracturing fluid thickener accounts for 0.8-1.2% by weight of the base fluid; the cross-linking agent is an alkane containing 8-12 carbon atoms Sulfonate. Stir and mix the base fluid and the cross-linking agent at room temperature until a viscoelastic liquid is formed, which is the seawater-based fracturing fluid. The seawater-based fracturing fluid provided by the present invention is physically cross-linked through multi-component association, has the advantages of good sand-carrying property, high temperature resistance, no heavy metal elements, and low content of gel-breaking fluid residue after gel-breaking, and is especially suitable for high-temperature oceans Oil and gas reservoir fracturing construction.

Description

technical field [0001] The invention belongs to the technical field of water-based fracturing fluid, and in particular relates to a sea-based fracturing fluid and its preparation method and application. Background technique [0002] In recent years, with the strategic in-depth development of oil and gas resources development, the ocean has become one of the important trends in the development of oil and gas resources. Offshore oil and gas resources are extremely rich, but offshore low-permeability oil and gas fields are generally less developed. Therefore, the development of offshore low-permeability oil and gas fields to increase oil and gas production has attracted increasing attention. At present, offshore low-permeability oil and gas fields are mainly sandstone reservoirs, which are characterized by deep geological burial, high temperature, high shale content, and low rock porosity, making development difficult. [0003] At present, large-scale, industrial fracturing ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/685E21B43/26
Inventor 郭布民王杏尊李小凡鲍文辉陈磊孙厚台李梦申金伟赵健
Owner SHANGHAI BRANCH CHINA OILFIELD SERVICES
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