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Improvement of sand-washing performance and internal flow field analysis of a novel downhole sand removal device

Improvement of sand-washing performance and internal flow field analysis of a novel downhole sand removal device

Zhiliang Wang ^1,2, Zhigang Fang ^2,3, Zhensong Wang ^2,3, Manlai Zhang ^4,5, Ruiquan Liao ^1,2

Zhiliang Wang ^1,2, Zhigang Fang ^2,3, Zhensong Wang ^2,3

¹School of Petroleum Engineering, Yangtze University, Wuhan, 430100, Hubei, China.
²Lift Test Base of China National Petroleum Corporation, Hami, 839009, Xinjiang, China.
³Research and Development Center, Tuha Oilfield Company, CNPC, Hami, 839009, Xinjiang, China.
⁴Lift Test Base of China National Petroleum Corporation, Hami, 839009, Xinjiang, China. manlai-zhang@foxmail.com.
⁵School of Mechanical Engineering, Yangtze University, Jingzhou, 434023, Hubei, China. manlai-zhang@foxmail.com.

⁰School of Petroleum Engineering, Yangtze University, Wuhan, 430100, Hubei, China.

Scientific Reports +

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July 5, 2024

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July 5, 2024

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View abstract on PubMed

Summary

This summary is machine-generated.

Sand production in shale gas wells reduces output. A new jet sand-washing device with optimized nozzle design improves sand removal efficiency, boosting shale gas well production in China.

Area Of Science

Petroleum Engineering
Fluid Mechanics
Geology

Background

Shale gas wells in the Sichuan-Chongqing region face declining production due to sand accumulation in middle and late exploitation stages.
Effective sand removal is crucial to prevent production loss and burial of the production layer.

Purpose Of The Study

To develop and optimize a novel downhole jet sand-washing device for enhanced shale gas well productivity.
To investigate the impact of nozzle structure and sand-washing fluids on device performance.

Main Methods

Comparative analysis of sand-washing fluids and nozzle structures.
Computational Fluid Dynamics (CFD) and internal flow field analysis of the sand-washing and unblocking process.
Control variable method to determine optimal design parameters.

Main Results

The device integrates a jet pump with an efficient sand-washing nozzle for dual sand-washing and negative-pressure sand conveying.
Key nozzle parameters influencing performance include length-diameter ratio, outlet diameter, and contraction angle.
Optimal ranges identified: length-diameter ratio (2-4), outlet diameter (6-10 mm), contraction angle (12°-16°), inlet diameter (18-22 mm).

Conclusions

The novel jet sand-washing device offers improved sand removal and unblocking capabilities.
Optimized nozzle dimensions are critical for maximizing the device's efficiency.
This research provides a new structural design and optimal parameter ranges for downhole sand removal devices.

Keywords:

Complete sand washing depth Computational fluid dynamics Novel sand removal device Sand washing nozzle Sand washing performance

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