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Slickwater fracturing fluid suitable for being used at hypersalinity condition

A high-salinity, water fracturing technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of poor salt resistance, poor sand-carrying performance, poor swelling, etc., to achieve low friction, Easy flowback, low cost effect

Inactive Publication Date: 2018-09-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the condition of high salinity in the dosing water, this type of polymer exhibits poor salt resistance, poor dispersion, poor swelling, and poor sand-carrying performance during construction, so it is not used for field promotion and application.

Method used

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  • Slickwater fracturing fluid suitable for being used at hypersalinity condition
  • Slickwater fracturing fluid suitable for being used at hypersalinity condition
  • Slickwater fracturing fluid suitable for being used at hypersalinity condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] By weight percentage, 50m on site 3 The container is filled with dosing water, and slowly add 0.06% EDTA and 0.02% citric acid, 0.05% ammonium polyacrylate, 0.03% fatty alcohol polyoxyethylene ether under the condition of pump circulation, circulate for 5 minutes, and then add 0.25% % polymer thickener with 0.03% clay stabilizer for 15 minutes to ensure that the liquid is fully mixed to form a homogeneous solution, after full circulation to form a slick water fracturing fluid, add 0.30% sodium lauryl sulfate during fracturing construction and 0.02% ammonium persulfate and 0.01% vitamin C. It can meet the sand concentration of 720Kg / m under the condition of high salinity of 150000mg / L 3 Fracturing construction needs.

[0043] Among them, the polymer thickener is obtained through the following process: by mass percentage, weigh 35% acrylamide, 6% acrylamide octadecyl methacrylate, 1% sodium dodecylbenzenesulfonate, 0.5% Ammonium persulfate-sodium thiosulfate, 0.18% hyd...

Embodiment 2

[0046] Percentage by weight, 50m on site 3 Fill the container with clean water, then slowly add 0.08% ethylenediamine and 0.03% gluconic acid, 0.06% ammonium polyacrylate, 0.02% alkylphenol polyoxyethylene ether under the condition of pump circulation, circulate for 10 minutes, and then press the formula Add 0.05% clay stabilizer to 0.30% thickener polymer and continue to circulate for 15 minutes until the solution is uniformly dispersed.

[0047] Among them, the polymer thickener is obtained through the following process: by mass percentage, weigh 35% acrylamide, 6% acrylamide octadecyl methacrylate, 1% sodium dodecylbenzenesulfonate, 0.5% Ammonium persulfate-sodium thiosulfate, 0.18% hydroxyethyl methacrylate, and water as the balance; it was heated to 30°C under stirring, and then nitrogen gas was introduced for 60 minutes, and then ammonium persulfate-sodium thiosulfate was added. Adopt microemulsion polymerization reaction for 8-10 hours, add hydroxyethyl methacrylate, c...

Embodiment 3

[0053] A slick water fracturing fluid suitable for use under high salinity conditions, consisting of the following components by weight percentage:

[0054]

[0055] The remaining ingredients are water; wherein, the dispersant includes a surfactant.

[0056] Wherein, the polymer thickener is obtained by the following method: by mass percentage, weigh 50% of acrylamide, 6% of acrylamide octadecyl methacrylate, 2% of sodium dodecylbenzenesulfonate, 0.5% ammonium persulfate-sodium thiosulfate and 0.25% hydroxyethyl methacrylate, the balance is water; water, acrylamide, acrylamide octadecyl methacrylate and sodium dodecylbenzenesulfonate , heated to 30°C under stirring, then nitrogen gas was introduced for 60 minutes, then ammonium persulfate-sodium thiosulfate was added, reacted for 8 hours, hydroxyethyl methacrylate was added, and cooled to room temperature to obtain a polymer thickener.

[0057] The chelating agent is formed by mixing substance A and substance B at a mass r...

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Abstract

Provided is a slickwater fracturing fluid suitable for being used at a hypersalinity condition. The slickwater fracturing fluid is prepared from, by mass, 0.15-0.45% of polymer viscosifier, 0.05%-0.15% of chelating agent, 0.05%-0.15% of dispersing agent, 0.02%-0.05% of clay stabilizer, 0.30%-0.50% of structure stabilizer, 0.02%-0.06% of gel breaker and the balance water. The slickwater fracturingfluid has the advantages of being low in viscosity, friction and cost and easy to recycle, easily flowing back and the like; the problems are mainly solved that at the hypersalinity condition, polymers are poor in salt resistance and sand-carrying stability and does not easily disperse; the problem can also be solved that vegetable glue fracturing fluid easily rots; after being filtered, flow-backliquid can be further directly recycled, and requirements of large-scale fracturing construction of compact oil-gas reservoirs can be effectively met.

Description

technical field [0001] The invention belongs to the field of oil field stimulation, in particular to a slick water fracturing fluid suitable for use under the condition of high salinity, and belongs to the working fluid for the reconstruction of low-permeability oil and gas field reservoirs. Background technique [0002] Fracturing has been developed rapidly and widely used as the main production and injection measures of oil and gas reservoirs. Fracturing is the use of pressure to open formations to form fractures and support them with proppant to reduce fluid flow resistance and increase production and injection measures. The purpose of fracturing is to form fractures with conductivity in the formation. The fracturing fluid used determines the fracturing effect to a large extent. At the same time, there are certain requirements for the viscosity of the fracturing fluid so that it can Fluids known as low viscosity flow back easily to avoid damage to hydrocarbon layers in t...

Claims

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Application Information

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IPC IPC(8): C09K8/60C09K8/66C09K8/68
CPCC09K8/68C09K8/602C09K8/604C09K8/665C09K2208/12
Inventor 李宪文范华波薛小佳赵文王成旺吴江李楷郭钢刘锦山树民刘顺吴顺林杨露
Owner PETROCHINA CO LTD
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