Carbon dioxide fracturing well bottom sand mixing enhancement device and method of use thereof

By designing a carbon dioxide fracturing bottom sand-mixing enhancement device, and utilizing the throttling effect and counterflow interference technology, the problem of bottom sand settling during the carbon dioxide fracturing sand-carrying process was solved, achieving a pollution-free and efficient sand-carrying effect.

CN116335619BActive Publication Date: 2026-01-20SHAANXI YANCHANG PETROLEUM GRP
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Patent Information

Application Number
CN202310275366.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-21
Publication Date
2026-01-20
Estimated Expiration
2043-03-21

AI Technical Summary

Technical Problem

Carbon dioxide fracturing is prone to sand settling at the bottom of the well during the sand-carrying process, which increases the risk of sand settling and sand blockage at or within the fracture. Existing methods increase viscosity by adding viscosifiers, but this changes the properties of carbon dioxide and causes pollution to the reservoir and the environment.

Method used

A carbon dioxide fracturing well bottom sand mixing enhancement device is designed, including a cylindrical tube and a throttling orifice with a specific structure. Through a two-stage throttling effect, it forms counter-flow and flow disturbance to prevent sand settling.

Benefits of technology

It achieves the prevention of bottom sand settling without the use of viscosifiers, reduces reservoir and environmental pollution, is applicable to different well depths and reservoirs, and has a simple structure, low cost and long service life.

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Abstract

The application relates to a carbon dioxide fracturing well bottom sand mixing reinforcing device and a use method thereof. Carbon dioxide sand carrying liquid flows in from an upper joint, part of the carbon dioxide sand carrying liquid enters from a first circular throttle, and part of the carbon dioxide sand carrying liquid enters from a first small aperture jet hole; the carbon dioxide sand carrying liquid flowing in from the first circular throttle impacts the bottom of a cavity; the carbon dioxide sand carrying liquid flowing in from the first small aperture jet hole impacts the bottom of the cavity on one side, flows downwards along an arc-shaped groove track to the bottom of the cavity, collides with the carbon dioxide sand carrying liquid flowing in from the first circular throttle and impacting the bottom of the cavity, and flows and interferes; in the process of flowing downwards, the carbon dioxide sand carrying liquid flows in from a second small aperture jet hole on the arc-shaped groove track, the carbon dioxide sand carrying liquid flowing in the lower cavity flows through the opening of the cavity side wall, an outward jet flow is generated at the side second small aperture jet hole under the action of a pressure difference, the jet flow and external sand carrying liquid are stirred and mixed again, and sand settlement is prevented.
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Citation Information

Patent Citations

  • Self-excited oscillation type pulse hydraulic fracturing tool and method

    CN111577235A

  • Horizontal oscillation jet-flow mixing integrated device

    CN1978039A