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Effectiveness Evaluation on Network Fracturing in Ultra-Deep and Extremely Thick Reservoirs in Kuqa Piedmont-A Case Study of Well KS2-A

  • 0Engineering Technology Department, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China.
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March 10, 2025

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March 10, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Network fracturing is theoretically effective for ultra-deep reservoirs, but current diversion technologies are insufficient. Further research into advanced plugging and diversion is crucial for deep exploration success.

Area Of Science

  • Petroleum Engineering
  • Geology
  • Reservoir Engineering

Background

  • The Cretaceous Bashijiqike formation in the Keshen Gas Field presents extreme conditions: depths over 8000m, 150 MPa pressure, and 190°C temperatures.
  • These harsh conditions and associated risks limit post-stimulation testing methods for ultra-deep reservoirs.

Purpose Of The Study

  • To assess the feasibility of network fracturing for ultra-deep reservoirs in the Kuqa Piedmont.
  • To determine effective methods for verifying successful fracturing in these challenging environments.

Main Methods

  • Analysis of geological and engineering factors influencing longitudinal and transverse fracture network formation.
  • Investigation of theoretical operating curve variations during temporary plugging and diversion.
  • Comparison of actual and theoretical operating curves post-diversion agent injection.
  • Integration with microseismic monitoring and well interpretation for result verification.

Main Results

  • Network fracturing can theoretically achieve transverse fracture networks and multilayer stimulation in ultra-deep, thick reservoirs with natural fractures.
  • Current temporary plugging diversion and layering technologies are ineffective for these ultra-deep conditions.

Conclusions

  • Effective network fracturing is theoretically possible for ultra-deep reservoirs, but current diversion technologies are inadequate.
  • Development of advanced ultra-deep temporary plugging and diversion technologies is essential for future exploration breakthroughs beyond 8000m.