Limit Pressure Drawdown to Control Shock Effects During Sampling
Critical data for early, optimized well tests and facility design
The low-shock sampling technique limits pressure drawdown during fluid sampling. Shock is minimized by pumping formation fluids into the MDT modular formation dynamics tester tool against piston chambers held at borehole pressure. This technique produces better results than drawing formation fluid into chambers at atmospheric pressure.
Reduced number of well tests and costs
Two deepwater Gulf of Mexico wells were wireline tested using conventional formation testing technology. Samples could not be recovered despite the long testing time. Using the low-shock MDT sampling technique in Well 3, the operator acquired an uncontaminated reservoir fluid sample and pressure data at a time significant savings. With this information, the need for well testing was reduced.
Faster reservoir characterization
A Gulf of Mexico operator drilled five deepwater wells. The operator attempted wireline testing using conventional and low-shock MDT techniques. The conventional tools had a sampling success ratio of 43%. In comparable formations, low-shock MDT sampling had a 100% success ratio. Low-shock sampling not only obtained high-quality PVT reservoir characterization samples but required less time.
Benefits
- Reduce well tests and costs
- Characterize reservoirs in less time
- Get PVT-quality fluid samples
- Reduced filtrate and solids contamination
- Single-phase capture
- Single-phase recovery in low-temperature wells
- Reduce wireline or hole conditioning trips
- Reduced rig time
- Reduced risk
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