Liquid-phase CO2 fracturing fluid

A technology of liquid carbon dioxide and fracturing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high friction and high friction that cannot be widely used, so as to improve sand-carrying performance, slow down settlement rate, The effect of changing the mode of settlement

Inactive Publication Date: 2015-12-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the liquid carbon dioxide fracturing fluid in the prior art still cannot be widely used due to the technical problem of high friction

Method used

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  • Liquid-phase CO2 fracturing fluid
  • Liquid-phase CO2 fracturing fluid
  • Liquid-phase CO2 fracturing fluid

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0041] Example 1: Cool carbon dioxide to -10°C indoors, pressurize to 25Mpa, take 2% tackifier, 5% auxiliary solvent, and 0.05% nano-coated fibers and add them to 92.95% liquid carbon dioxide through a closed injection device, and stir It is dissolved and formulated into a liquid carbon dioxide fracturing fluid system.

Embodiment 2

[0042] Embodiment 2: In the room, carbon dioxide is cooled to -10°C, pressurized to 25Mpa, gets 2% tackifier, 5% auxiliary solvent, 0.1% nano-coated fiber and adds it to 92.9% liquid carbon dioxide through airtight injection equipment, stir It is dissolved and formulated into a liquid carbon dioxide fracturing fluid system.

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Abstract

The invention discloses a liquid-phase CO2 fracturing fluid including a tackifying agent, an auxiliary solvent, nano coating fibers and liquid CO2, wherein the nano coating fibers particularly comprise polymer / inorganic ion nano composite fibers, polymer / carbon nano tube composite fibers, polymer / lamellar filling material composite fibers, polymer / montmorillonite nano composite fibers or polymer / graphite nano composite fibers. In the embodiment above, by means of addition of the nano coating fibers to the liquid-phase CO2 fracturing fluid, friction resistance in a constructed tubular column is reduced. In addition, the nano coating fibers can form a fiber network in the liquid-phase CO2 fracturing fluid, thereby improving sand carrying performance of the fracturing fluid, changing sedimentation manner and reducing sedimentation rate of a propping agent.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas exploitation, in particular to a liquid carbon dioxide fracturing fluid. Background technique [0002] Unconventional natural gas resources include shale gas, tight sandstone gas, etc. Currently, unconventional oil and gas resources have played an important role in the global energy structure. The reservoir physical properties of unconventional oil and gas resources are generally poor, with physical characteristics such as low porosity, low permeability, and low pore throat radius, and the flow resistance of oil and gas is much greater than that of conventional oil and gas reservoirs. The application of hydraulic fracturing technology to the exploitation of unconventional oil and gas reservoirs such as shale gas and tight gas will cause a series of problems such as water sensitivity and reservoir pollution, and the lack of water resources is also an important factor restricting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/62
CPCC09K8/62C09K2208/08
Inventor 王峰刘合王毓才李国欣张应安张劲张士诚许建国林其勇孟思炜朱兆鹏张融
Owner PETROCHINA CO LTD
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