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Experimental Study on a Liquid-Solid Phase-Change Autogenous Proppant Fracturing Fluid System.

Yixin Chen1, Yu Sang1, Jianchun Guo2

  • 1PetroChina Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road, Chenghua District, Chengdu, Sichuan 646002, China.

ACS Omega
|March 20, 2023
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Summary
This summary is machine-generated.

A novel liquid-solid phase-change autogenous proppant fracturing fluid system eliminates sand-carrying issues in oil and gas wells. This system transforms into solid particles in situ, offering superior conductivity and crush resistance compared to conventional proppants.

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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Chemical Engineering

Background:

  • Conventional fracturing fluids face challenges with "sand-carrying," leading to operational inefficiencies and formation damage.
  • The need for advanced fracturing fluid systems that minimize or eliminate solid particle injection is critical in oil and gas exploration.

Purpose of the Study:

  • To propose and evaluate a novel liquid-solid phase-change autogenous proppant fracturing fluid system (LSPCAP).
  • To address the limitations of conventional "sand-carrying" technologies in oil and gas field fracturing operations.

Main Methods:

  • Development of a two-component fluid system: phase-change liquid (PCL) and non-phase-change liquid (NPCL).
  • Selection of bisphenol-A epoxy resin for PCL and deionized water with nonionic surfactant for NPCL, based on molecular interaction theory.
  • Comprehensive testing including rheological properties, filtration, friction, particle size analysis, crushing resistance, and conductivity.

Main Results:

  • The LSPCAP system exhibits non-Newtonian fluid properties and no wall-building tendency.
  • Filtration coefficients were measured, with the mixture showing a damage rate of 18%.
  • Significant friction reduction (69%) was achieved at a PCL:NPCL ratio of 1:10.
  • Autogenous solid particles demonstrated good sorting (S = 1.04-1.73), low crush rates (3.56-8.42%), and superior conductivity compared to quartz sand and ceramsite under 10-30 MPa.

Conclusions:

  • The proposed liquid-solid phase-change autogenous proppant fracturing fluid system effectively overcomes "sand-carrying" issues.
  • The system offers tunable particle properties and enhanced performance metrics, including conductivity and crush resistance.
  • LSPCAP presents a promising alternative to conventional proppants in hydraulic fracturing applications.