SY/T 5748-2020 in English
VALIDDetermination method of gas breakthrough pressure in rock
- Issued on:2020-10-23
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
Introduction
Background of Standard Revision and Technological Evolution
SY/T 5748-2020, as an alternative version of SY/T 5748-2013, has been revised to adapt to the technological progress of equipment such as high temperature and high pressure core holder. The standard has added a weighted average density calculation formula (Formula 1) and an outlet pressure determination method, reflecting the higher requirements for the evaluation of tight rock sealing in the development of unconventional oil and gas reservoirs in recent years.
Definition of key terms
| Terms | Definition | Unit of measurement |
|---|---|---|
| Gas breakthrough pressure | The pressure difference between the inlet and outlet when the gas forms a continuous flow channel in the rock | MPa |
| Net confining pressure | The difference between the confining pressure and the pore pressure on the core | MPa |
| Effective overburden pressure | Simulated formation pressure conditions calculated by the formula | MPa |
Core Equipment Technical Specifications
Key equipment requirements:
- Pressure pump: working pressure ≥50.0MPa
- High temperature and high pressure core holder: pressure resistance 50.0MPa, temperature resistance above 150℃
- Flow detection device: range 5mL/min, accuracy ±0.05mL/min
- Vacuum pressurization saturation device: vacuum degree <10-4MPa, pressure ≥25.0MPa
Experimental case: A shale gas block used a diamond wire cutting machine to prepare a plunger sample with a diameter of 2.5cm. The breakthrough pressure was measured to be 8.3MPa at 50℃ and a net confining pressure of 15MPa.
Comparison of old and new standards
| Comparison dimensions | 2013 version | 2020 version |
|---|---|---|
| Safety warning | Not specified | New laboratory safety requirements |
| Equipment classification | Instruments and materials | Changed to equipment and materials |
| Experimental flow chart | Simplified schematic diagram | Updated to modular device diagram |
| Data rounding rules | Not specified | Clarify the number of rounding digits for length/diameter/pressure values |
Implementation suggestions
- For kerosene-saturated rock samples, the interfacial tension conversion must be performed according to formula (3):
Pw = Po×(σgw/σgo) - When the clay mineral content of the rock sample is greater than 15%, kerosene is preferably used as the saturated medium
- The breakthrough pressure test should be performed in a step-by-step manner according to the pressure intervals specified in Table 2, with each pressure point maintained for 30-120 minutes
- The outlet pressure setting should be 0.1-1.0MPa higher than the saturated vapor pressure of water at the test temperature
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
SY/T 6203-2014 in English
Wrecking method for oil and gas well blowout and fire
2014-10-15 -
SY/T 5429-1991 in English
Small diameter flow moisture tester
1992-01-15 -
SY 5210-1991 in English
Well repair faucet
1991-11-20 -
SY 5509-1992 in English
POT-2420 crude oil demulsifier
1992-11-03 -
SY/T 5844.1-1995 in English
Petroleum geological experiment information code geochemical part
1995-04-25 -
SY/T 6268-1996 in English
Recommended Practices for Selection of Tubing and Casing
1996-12-31
