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Integrated self-crosslinking fracturing method, applied fracturing fluid, and preparation method and application thereof

A fracturing fluid and self-crosslinking technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of poor temperature and shear resistance, poor stimulation effect, formation damage, etc. The effect of convenient preparation, measurement and easy operation

Active Publication Date: 2021-06-25
北京爱普聚合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional water-based fracturing fluids require at least a cross-linking agent as an additive. The cross-linking effect is unstable, the controllability is poor, and the temperature and shear resistance are poor, resulting in a low sand ratio and insufficient sand carrying capacity. Avoid the generated residue and residual glue from causing damage to the formation, resulting in poor production stimulation effects, especially for unconventional oil and gas reservoirs, which can easily cause irreversible damage to the formation and lead to no oil and gas

Method used

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  • Integrated self-crosslinking fracturing method, applied fracturing fluid, and preparation method and application thereof

Examples

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preparation example Construction

[0038] As a preference, the thickener can be selected from the thickener formula disclosed in the invention patent application with the application number 201811402402.9 and the invention title "Integrated Self-Crosslinking Emulsion Type Fracturing Fluid Thickener, Its Preparation Method and Application" , the raw materials of the thickener include the following raw material components in terms of mass percentage:

[0039] Oil-soluble solvent 35-50%;

[0040] Deionized water 26-30%;

[0041] Viscosifying monomer 12-15%;

[0042] Modified monomer 5-8%;

[0043] Anionic emulsifying active monomer 2~3%;

[0044] Cationic quaternary ammonium salt type monomer 2~3%;

[0045] Anionic emulsifier 0.5-1%;

[0046] Non-ionic emulsifier 2.5-4%;

[0047] Preferably, the oil-soluble solvent includes any one or a combination of two or more of white oil, silicone oil and petroleum ether;

[0048] As preferably, the tackifying monomer comprises any one or two or more of acrylamide, sod...

Embodiment 1

[0083] Laboratory application and performance testing of the integrated self-crosslinking fracturing method:

[0084] Keep the water temperature at 10°C, add 298.8g of tap water to the liquid preparation equipment, keep stirring, and at the same time add 1.2g of integrated self-crosslinking fracturing fluid thickener, 0.15g of ammonium persulfate and 120cm 3 After the ceramsite is evenly mixed with sand, it becomes an integrated self-crosslinking fracturing fluid. Put it into an aging tank, raise the temperature to 180°C, and break the gel completely after 2 hours to complete the indoor evaluation process.

[0085] The integrated self-crosslinking fracturing fluid prepared above is used as slick water. After testing, the viscosity is 28mPa·s, the drag reduction rate is 70%, the sand ratio is 40%, the gel breaking fluid viscosity is 2.4mPa·s, and the core damage rate is 12%. , temperature resistance 180 ° C, 10 ° C at 3 ° C / min continuous heating to 180 ° C, 170s -1 The visco...

Embodiment 2

[0087] Laboratory application and performance testing of the integrated self-crosslinking fracturing method:

[0088] Keep the water temperature at 40°C, add 490.0g of surface water to the liquid preparation equipment, keep stirring, and at the same time add 10.0g of integrated self-crosslinking fracturing fluid thickener, 0.5g of capsule breaker and 500cm 3 Quartz sand, mixed evenly, becomes an integrated self-crosslinking fracturing fluid. Put it into an aging tank, raise the temperature to 180°C, and break the gel completely after 2 hours to complete the indoor evaluation process.

[0089] The integrated self-crosslinking fracturing fluid prepared above is used as a sand-carrying fluid. After testing, the viscosity is 198mPa s, the drag reduction rate is 45%, the sand ratio is 100%, the gel breaking fluid viscosity is 1.8mPa s, and the core damage rate is 8 %, temperature resistance 180°C, 180°C, 170s -1 Shear 90min viscosity 62.0mPa·s.

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Abstract

The invention discloses an integrated self-crosslinking fracturing method, applied fracturing fluid, and a preparation method and application of the fracturing fluid. The fracturing method comprises the steps of preparing aqueous solutions with different mass fractions as the fracturing fluid by using an integrated self-crosslinking emulsion type fracturing fluid thickening agent, that is, the slick water drag reduction fracturing with the conventional sand ratio and the high sand ratio is performed by using the 0.05-0.4 wt% of the thickening agent solution, the sand-carrying fracturing with the conventional sand ratio and the high sand ratio is performed by using the 0.4-2.0 wt% of the thickening agent solution, the mass fraction is adjusted at will, the slick water drag reduction fracturing and the sand-carrying fracturing are switched at any time, and the field application of the drag reduction and sand-carrying conventional fracturing and the large-scale continuous fracturing is met. The fracturing fluid disclosed by the invention has the characteristics of integration of resistance reduction and sand-carrying fracturing, integration of materials and preparation, integration of multiple functions, self-crosslinking characteristic, easiness in preparation and operation, capability of meeting conventional fluid preparation and large-scale online continuous fluid preparation, facilitation of environmental protection and reservoir protection, low cost, high cost performance, excellent yield increasing effect and the like.

Description

technical field [0001] The invention belongs to the technical field of fracturing stimulation, and in particular relates to a water-based fracturing method, in particular to an integrated self-crosslinking fracturing method, an integrated self-crosslinking fracturing fluid used, its preparation method and its application in conventional Oil and gas fields and unconventional oil and gas fields, such as shale gas, shale oil, tight oil and gas, coalbed methane and other oil and gas fields. Background technique [0002] The purpose of fracturing is to form fractures with conductivity in the reservoir, and the fracturing fluid used largely determines the fracturing effect. At the same time, there are certain requirements for the viscosity of the fracturing fluid, so that it is easy to carry sand, and after fracturing, it becomes a low-viscosity liquid that is easy to flow back, so as to avoid damage to the oil and gas layers in the reservoir. The fracturing methods currently use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/80C09K8/88E21B43/26
CPCC09K8/68C09K8/80C09K8/882C09K8/602E21B43/26C09K2208/12C09K2208/28
Inventor 郑焰袁彦峰白小丹罗于建杨传海王亚男
Owner 北京爱普聚合科技有限公司
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