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Temperature response type phase-change fracturing fluid and using method thereof

A temperature-responsive, variable fracturing technology, applied in the field of hydraulic fracturing, can solve problems such as clogging of cracks, complicated process implementation, and pollution of fracturing fluid residues, and achieve high conductivity, broad market prospects, and low solid phase density. Effect

Pending Publication Date: 2020-07-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems that the existing hydraulic fracturing technology needs to inject solid-phase proppant into the formation, the process is complicated, the fracturing fluid residue pollutes the reservoir, and blocks the cracks, the present invention provides a method that can realize temperature-controlled phase transition and has a certain Temperature-responsive phase-change fracturing fluid with strength and support properties

Method used

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  • Temperature response type phase-change fracturing fluid and using method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First take 10g of unsaturated polyester, then respectively add styrene (2g), glycidyl methacrylate (3g) and BPO (0.15g) to it and stir evenly to complete the preparation of functional oil phase GOP1; take 30g of To mineralize the water, polyvinyl alcohol (0.5 g) and sodium dodecylbenzene sulfonate (1 g) were added to complete the preparation of the functional water phase GWP1 with a concentration of 5 wt%.

[0030] Mix 50% GOP1 and 50% GWP1 in a beaker and stir evenly to obtain phase change fracturing fluid PCF1, place it in a constant temperature oil bath, raise the temperature to 80-90°C and react for 0.5-3 hours to stop heating, take out the beaker to observe the PCF1 sample The appearance of uniform bead-like and a little block-like solid phases shows that PCF1 can be used for phase change fracturing and can realize the transition from liquid phase to solid phase.

Embodiment 2

[0032] First take 10g of unsaturated polyester, then add styrene (2g), vinyl acetate (2g), glycidyl methacrylate (4g) and BPO (0.15g) to it and stir evenly to complete the functional oil phase The preparation of GOP2: Get 30g of mineralized water, add polyvinyl alcohol (0.5g), sodium dodecylbenzenesulfonate (1g), ammonium persulfate (0.5g), promptly complete the functional water phase that concentration is 6wt% Formulation of GWP2.

[0033] Mix and stir 20% GOP2 and 80% GWP2 in a beaker to obtain phase change fracturing fluid PCF2, place it in a constant temperature oil bath, raise the temperature to 90-100°C and react for 0.5-3 hours to stop heating, take out the beaker to observe the PCF2 sample The appearance of uniform bead-like and a little block-like solid phase has a porous structure, indicating that the phase change fracturing fluid PCF2 can be used for phase change fracturing and can realize the transition from liquid phase to solid phase.

Embodiment 3

[0035] First take 10g of unsaturated polyester, then add vinyl acetate (2g), divinylbenzene (1g), glycidyl methacrylate (4g) and BPO (0.15g) to it and stir evenly to complete the functional oil The preparation of phase GOP3: get 30g of mineralized water, add polyvinyl alcohol (0.5g), sodium dodecylbenzenesulfonate (1g), ammonium persulfate (0.5g), promptly complete the function water that concentration is 6wt% Phase GWP3 formulation.

[0036] Mix and stir 30% GOP3 and 70% GWP3 in a beaker to obtain phase change fracturing fluid PCF3, place it in a constant temperature oil bath, raise the temperature to 60-80°C and react for 0.5-3 hours to stop heating, take out the beaker to observe the PCF3 sample The appearance of uniform bead-like and a little block-like solid phases shows that PCF3 can be used for phase change fracturing and can realize the transition from liquid phase to solid phase.

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Abstract

The invention relates to the technical field of hydraulic fracturing. A solid-phase propping agent needs to be injected into a stratum in an existing hydraulic fracturing technology, in order to solvethe problems of complex process implementation, reservoir pollution caused by fracturing fluid residues and crack blockage, the invention provides a temperature response type phase-change fracturingfluid and a use method thereof, and the temperature response type phase-change fracturing fluid is composed of the following components in percentage by mass: 20-50% of a functional oil phase and 50-80% of a functional water phase. The temperature response type phase-change fracturing fluid can realize temperature control phase change, is changed into a solid material by virtue of covalent bonds and non-covalent bonds, has specific strength and supporting property, and does not need to be added with other solid-phase proppants; by means of the temperature response type phase-change fracturingfluid, a hydraulic fracturing construction process without injecting the solid-phase propping agent can be achieved, construction risks and potential safety hazards are effectively reduced, and the temperature response type phase-change fracturing fluid is suitable for fracturing transformation production increase of oil and gas field reservoirs.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing, in particular to a temperature-responsive phase-change fracturing fluid and a use method thereof. Background technique [0002] Hydraulic fracturing technology is an important technology for reservoir stimulation. It has been widely used in the stimulation of low-permeability reservoirs and the production of oil and gas wells, providing an important guarantee for the stable production of oil and gas fields. Fracturing fluid can form a certain length of artificial seepage channels in oil and gas reservoirs, and the fractures formed by fracturing need to have stable geometry and high conductivity. [0003] Existing hydraulic fracturing technologies more or less have the following problems: complex process, high requirements for construction equipment; evenly laid proppant, limited fracture conductivity; fracturing fluid residues pollute reservoirs and block fractures, etc. In 2010, Sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/267
CPCC09K8/68C09K8/885C09K8/882E21B43/267
Inventor 杜光焰陈贤惠原静静彭远元张艺芬
Owner ZHEJIANG UNIV OF TECH
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