Experimental Determination of Gas Relative Permeability Considering Slippage Effect in a Tight Formation
Abstract
:1. Introduction
2. Experimental
2.1. Core Samples Preparation
2.2. Fluid Preparation
2.3. Apparatus
2.4. Experimental Procedure
- (1)
- Prepare the synthetic brine and nitrogen as mentioned in Section 2.2, and inject the synthetic brine into the cylinder;
- (2)
- Vacuum the core sample for 12 h and saturate it by injecting synthetic brine into it under 30.0 MPa for 12 h;
- (3)
- Place the saturated core sample into the core holder and increase experimental temperature through the temperature control system to programmed temperature. Confining pressure has also been loaded in this step since the confining pressure is crucial for accurately estimating reliable permeability of tight sandstone under reservoir conditions [20];
- (4)
- Inject the synthetic brine until the injected pressure is stable and record the pressure at the inlet and outlet of the core sample as well as the rate of produced liquid for determining absolute permeability of the core sample;
- (5)
- With an outlet pressure of 0.10 MPa, the nitrogen is injected until no more brine is produced and the gas flow rate and injection pressure are recorded for calculating the effective gas permeability at an irreducible water saturation (). As such, the endpoints of the relative permeability curve, i.e., [,] and [,], can be obtained;
- (6)
- By considering the injection pressure being less than 4.50 MPa (see GB/T 28912-2012), the synthetic brine and gas with specific rate ratio are injected until the flow is stable. Two criteria are employed to determine whether the stable flow is reached or not: (a) injection pressure at the inlet keeps steady and (b) the gas flow rate at the outlet is constant;
- (7)
- After the stable state is reached, the injection pressure, gas, and water flow rate are recorded for determining the corresponding effective gas phase and water phase permeability, respectively. Note that the gas and water viscosity, used in Equations (2) and (3), is dynamically varied according to experimental pressure and temperature as shown in Figure 3a,b. The water saturation at current circumstance can be determined by weighting the produced water volume. In this case, two points, i.e., [,] and [,] (), on the relative permeability curves can be obtained;
- (8)
- More points, i.e., [,] (), on the gas–water relative permeability curves can be determined by dynamically changing the ratio of water flow rate to gas flow rate and repeating Steps 6–7; and,
- (9)
- Terminate the experiment when gas relative permeability is less than 0.005 (see GB/T 28912-2012).
2.5. Determination of Relative Permeability
3. Results and Discussions
3.1. New Correlations: vs.
3.2. Calibration of Gas Relative Permeability
3.3. Gas–Water Relative Permeability Sensitivity Analysis
3.3.1. Effect of
3.3.2. Effect of Confining Pressure
3.3.3. Effect of Temperature
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Group No. | Core No. | , mD | Porosity, % | Length, cm | Diameter, cm |
---|---|---|---|---|---|
Group #1 | #1 | 0.0535 | 7.12 | 6.942 | 2.511 |
#2 | 0.3427 | 12.39 | 7.215 | 2.517 | |
#3 | 0.2046 | 7.81 | 6.872 | 2.515 | |
#4 | 0.4264 | 10.97 | 6.928 | 2.509 | |
#5 | 0.1371 | 8.35 | 6.927 | 2.512 | |
#6 | 0.4327 | 9.21 | 7.237 | 2.513 | |
#7 | 0.0952 | 4.45 | 7.452 | 2.516 | |
#8 | 0.1464 | 8.10 | 6.844 | 2.514 | |
#9 | 0.3010 | 9.81 | 6.738 | 2.512 | |
#10 | 0.0511 | 5.85 | 7.328 | 2.521 | |
#11 | 0.0929 | 7.36 | 6.924 | 2.512 | |
#12 | 0.3058 | 9.89 | 6.668 | 2.514 | |
Group #2 | #13 | 0.1418 | 7.06 | 7.076 | 2.514 |
#14 | 0.2986 | 7.97 | 6.786 | 2.508 | |
#15 | 0.7312 | 8.18 | 7.452 | 2.516 | |
#16 | 2.8730 | 13.61 | 7.084 | 2.516 | |
#17 | 0.2280 | 5.79 | 6.766 | 2.512 |
Core No. | , mD | Confining Pressure, MPa | Temperature, °C | Pressure Drop, MPa |
---|---|---|---|---|
13 | 0.1418 | 30 | 90 | 8 |
14 | 0.2986 | 30 | 90 | 8 |
15 | 0.7312 | 30 | 90 | 8 |
16 | 2.8730 | 30 | 90 | 4 |
50 | 90 | 4 | ||
17 | 0.2280 | 30 | 25 | 4 |
30 | 50 | 4 | ||
30 | 90 | 4 |
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Liu, G.; Fan, Z.; Lu, Y.; Li, S.; Feng, B.; Xia, Y.; Zhao, Q. Experimental Determination of Gas Relative Permeability Considering Slippage Effect in a Tight Formation. Energies 2018, 11, 467. https://doi.org/10.3390/en11020467
Liu G, Fan Z, Lu Y, Li S, Feng B, Xia Y, Zhao Q. Experimental Determination of Gas Relative Permeability Considering Slippage Effect in a Tight Formation. Energies. 2018; 11(2):467. https://doi.org/10.3390/en11020467
Chicago/Turabian StyleLiu, Guangfeng, Zhaoqi Fan, Yang Lu, Siying Li, Bo Feng, Yu Xia, and Qimeng Zhao. 2018. "Experimental Determination of Gas Relative Permeability Considering Slippage Effect in a Tight Formation" Energies 11, no. 2: 467. https://doi.org/10.3390/en11020467
APA StyleLiu, G., Fan, Z., Lu, Y., Li, S., Feng, B., Xia, Y., & Zhao, Q. (2018). Experimental Determination of Gas Relative Permeability Considering Slippage Effect in a Tight Formation. Energies, 11(2), 467. https://doi.org/10.3390/en11020467