SY/T 7609-2020 in English

Analysis of standard technical framework

Key technical innovations

3D geological modeling expansion requirements: The standard clearly stipulates that the modeling range should be expanded by more than one well spacing to ensure the accuracy of boundary effect assessment. The application of Daqing Oilfield shows that this requirement can reduce the recovery factor prediction error by 12.7%.

Implementation difficulties and countermeasures

Stratum combination contradiction

Article 7.2 of the standard requires that the difference in physical properties is ≤3 times. In actual operation, it is necessary to pass:

1. Fine small layer division (≤2m single layer)
2. Dynamic monitoring and adjustment of injection-production correspondence rate
3. Selective injection of packers

Chemical agent adsorption loss

Refer to the requirements of standard 8.2.1(c), it is recommended that:

• Pre-sacrificial agent slug (0.05PV)
• Surfactant compound ratio optimization
• Regular backflow fluid composition monitoring

Development index prediction specifications

Chapter 9 of the standard stipulates that it must include:

Standard evolution analysis

Main improvements compared to SY/T 6174-2012:

• Added quantitative requirements for 3D geological modeling (Article 5.2)
• Refine the technical path for residual oil analysis (Article 6.4)
• Clarify the chemical agent commodity dosage prediction formula (Article 8.2.8)

After the implementation of this standard, it is expected that the design cycle of chemical composite flooding schemes can be shortened by 30%, and the success rate of field tests can be increased to more than 82%.