Phase change fracturing fluid system for phase change fracturing

A phase change fracturing and liquid technology, which is applied in the fields of fluid production, drilling composition, wellbore/well components, etc., can solve the problems of difficult injection, difficult injection, complicated process implementation, etc. The effect of crack construction is easy to operate and reduces construction costs

Active Publication Date: 2016-12-07
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2010, Schlumberger proposed that the fracture conductivity of HIWAY high-speed channel flow is not affected by the permeability of proppant. Compared with conventional fracturing technology, this technology also needs to inject solid phase proppant into the formation, and the process implementation...

Method used

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  • Phase change fracturing fluid system for phase change fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First take 50g of toluene, then add 5g of melamine, 5g of triallyl isocyanurate, 10g of vinyl acetate, 1g of sodium dodecylbenzenesulfonate, 0.5g of hydrogen peroxide, and 1g of polyethylene glycol in sequence. Put everything in a flask and stir evenly at room temperature to complete the preparation of phase change fracturing fluid FfP1.

[0020] Place the well-stirred FfP1 flask in a constant temperature oil bath, raise the temperature to 80-90°C and react for 0.5-5 hours, stop heating, take out the flask and observe beads and massive solid phases appearing in the FfP1 sample. It shows that the phase change fracturing fluid FfP1 can be used in phase inversion fracturing, and can realize the transition from liquid phase to solid phase.

Embodiment 2

[0022] First take 50g of o-xylene, then add 12g of melamine, 10g of vinyl acetate, 2g of acrylonitrile, 0.5g of sodium dodecylbenzenesulfonate, Tween 20 (0.5g), 2g of sodium phosphate, and 0.5g of ammonium persulfate. Stir evenly at room temperature to complete the preparation of phase change fracturing fluid FfP2.

[0023] Place the well-stirred FfP2 flask in a constant temperature oil bath, raise the temperature to 90-100°C and react for 0.5-5 hours, stop heating, take out the flask and observe the appearance of beads and massive solid phases in the FfP2 sample. It shows that the phase change fracturing fluid FfP2 can be used in phase inversion fracturing, and can realize the transition from liquid phase to solid phase.

Embodiment 3

[0025] First take 50g of ethylbenzene, then add 10g of melamine, 4g of triallyl isocyanurate, 10g of acrylonitrile, 0.5g of sodium dodecylbenzenesulfonate, and 0.5g of cetyltrimethylammonium bromide , calcium chloride 2g, hydrogen peroxide 1g, polyvinylpyrrolidone 1g. Stir evenly at room temperature to complete the preparation of phase change fracturing fluid FfP3.

[0026] Place the well-stirred FfP3 flask in a constant temperature oil bath, raise the temperature to 70-80°C and react for 0.5-5 hours, stop heating, take out the flask and observe the appearance of beads and massive solid phases in the FfP3 sample. It shows that the phase change fracturing fluid FfP3 can be used in phase inversion fracturing, and can realize the transition from liquid phase to solid phase.

[0027] Table 1 Solid phase properties of phase change fracturing fluid after phase change

[0028]

[0029] The data in Table 1 shows that the density of the solid phase after the phase transition is lo...

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Abstract

The invention discloses a phase change fracturing fluid system for phase change fracturing. The phase change fracturing fluid system is prepared from, by weight, 10%-40% of supramolecular building structure, 0-40% of supramolecular function unit, 0.5%-2% of surfactant, 0-5% of inorganic salt, 0.5%-2% of oxidizing agent, 0-2% of cosolvent and the balance solvent, wherein the supramolecular building structure is melamine or triallyl isocyanurate or a mixture of melamine and triallyl isocyanurate, the supramolecular function unit is vinyl acetate or acrylonitrile or a mixture of vinyl acetate and acrylonitrile, and the solvent is methylbenzene or ethylbenzene or o-xylene or m-xylene or p-xylene. In the fracturing construction process, a conventional fracturing fluid is used for fracturing a stratum, the phase change fracturing fluid is injected into the stratum, or the phase change fracturing fluid and other fluids which cannot be subjected to phase change are injected into the stratum together, a supramolecular material in the phase change fracturing fluid is subjected to self-assembly to form a solid phase material with a certain strength, support to cracks is achieved, and construction operation is easy, convenient, safe and efficient.

Description

technical field [0001] The invention relates to reservoir hydraulic fracturing stimulation technology in the process of petroleum development, belongs to the research field of supramolecular chemistry and self-assembly nanotechnology, and specifically relates to a phase-change fracturing fluid system based on supramolecular self-assembly. Background technique [0002] Hydraulic fracturing technology has been widely used in the development of oil and gas fields as the main measure for oil and gas well stimulation and water well injection, and has made important contributions to the stable production and injection of oil and gas fields. Hydraulic fracturing is to pump high-viscosity pre-fluid into the target reservoir to form and extend fractures at high pressure, and then pump sand-carrying fluid mixed with proppant. The sand-carrying fluid can continue to extend the fracture and carry proppant deep into the fracture. For fractures, it is best to degrade the fracturing fluid ...

Claims

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Application Information

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IPC IPC(8): C09K8/64C09K8/70C09K8/80
CPCC09K8/64C09K8/70C09K8/80E21B43/26C09K8/68C09K8/88
Inventor 杜光焰杨勇赵立强余东合刘国华杜娟车航罗志峰裴宇昕李年银刘平礼徐昆
Owner PETROCHINA CO LTD
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