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Seawater-based fracturing fluid as well as preparation method and application thereof

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

Active Publication Date: 2019-04-05
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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  • Seawater-based fracturing fluid as well as preparation method and application thereof
  • Seawater-based fracturing fluid as well as preparation method and application thereof
  • Seawater-based fracturing fluid as well as preparation method and application thereof

Examples

Experimental program
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Effect test

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 seawater-based fracturing fluid as well as a preparation method and application thereof. The seawater-based fracturing fluid comprises a base fluid and cross-linking agent accounting for 0.1 to 0.14 percent of the weight of the base fluid; the base fluid comprises a seawater-based fracturing fluid thickening agent, a chelating agent, a high-temperature stabilizer, an anti-swelling agent, a drainage aid, a performance regulator and seawater, and the seawater-based fracturing fluid thickening agent accounts for 0.8 to 1.2 percent of the weight of the base fluid; and the cross-linking agent is alkyl sulfonate containing 8 to 12 carbon atoms. The base fluid and the cross-linking agent are stirred and mixed at a room temperature to form viscose and elastic fluid, i.e. theseawater-based fracturing fluid. The seawater-based fracturing fluid provided by the invention has the advantages of good sand carrying property, high temperature resistance, no heavy metal elements,low content of gel breaking residue after gel breaking and the like by carrying out the physical cross-linking by virtue of multi-element association effect, and is particularly suitable for the fracturing construction of marine high-temperature oil and gas reservoirs.

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 Applications(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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