ISO 7055:2023

Overview

ISO 7055:2023 establishes a standardized laboratory method for determining drag reduction performance of slick water used in the natural gas upstream sector, particularly in shale gas volume fracturing operations. This international standard provides a precise pipeline-based test procedure that effectively simulates field conditions, enabling reliable evaluation of slick water’s ability to reduce frictional resistance in pipelines. With a focus on experimental setup, operating conditions, and measurement methodology, ISO 7055:2023 ensures that drag reduction values obtained reproducibly reflect on-site performance, supporting efficient and cost-effective fracturing operations.

Key Topics

• Drag Reduction Measurement
  ISO 7055:2023 specifies the use of a fluid flow loop with a test pipeline to measure differential pressure, providing direct insights into the drag reduction capabilities of slick water compared to fresh water under standardized conditions.

• Pipeline Methodology
  The standard adopts the pipeline method-recognized as the most effective technique for evaluating drag reduction-utilizing equipment such as a mixing tank, progressive cavity pump, flow meter, and differential pressure sensors.

• Experimental Conditions and Devices
  Detailed parameters include:

  • Test pipe inner diameter of 8 mm with controlled surface roughness.
  • Fluid flow velocity maintained at 10 m/s to mimic operational conditions.
  • Mechanical stirring in a minimum 30-liter mixing tank for consistent slick water preparation.
  • Pressure sensors with ±0.25% full-scale accuracy and flow meters with less than 0.20% relative error.

• Calculation and Data Processing
  Drag reduction percentage is calculated from the pressure difference between fresh water and slick water flows through the test pipe, facilitating quantifiable performance metrics.

• Repeatability and Accuracy
  The method ensures reliable results with repeatability criteria stating absolute deviation between parallel samples should not exceed 5%.

Applications

ISO 7055:2023 plays a crucial role in the natural gas upstream industry, particularly in the context of:

• Shale Gas Hydraulic Fracturing
  Evaluating slick water formulations to optimize drag reduction - a vital factor that influences pumping pressures, operational safety, and overall fracturing efficacy.

• Fracturing Fluid Development
  Supporting chemical manufacturers and testing laboratories in precisely assessing the impact of drag-reducing additives, surfactants, and bactericides under controlled conditions before field deployment.

• Pipeline Flow Efficiency
  Informing operators and engineers on drag reduction performance to minimize energy consumption during fluid transport, reduce wear on pumping equipment, and control operational costs.

• Quality Control and Standardization
  Enabling laboratories to adopt a globally recognized method for routine slick water characterization, ensuring consistency across the industry and facilitating regulatory compliance.

Related Standards

• ISO 8503-4
  Specifies the calibration of surface profile comparators critical for test pipe surface roughness measurement, directly referenced in ISO 7055 for ensuring accurate test pipe preparation.

• Industry-Specific Standards for Fracturing Fluids
  Complementary documents governing chemical composition and testing protocols for fracturing fluids can enhance validation alongside drag reduction tests.

• ISO/IEC Directives
  Guidelines on developing and maintaining ISO standards ensure ISO 7055 adherence to international best practices in standardization.

Keywords: ISO 7055:2023, drag reduction, slick water, natural gas upstream, shale gas fracturing, hydraulic fracturing, fluid flow loop, pipeline method, fracturing fluid testing, drag-reducing agent, laboratory standard, pressure differential measurement.