Sand Production Caused by Water-Hammer Events: Implications for Shut-In Protocols and Design of Water-Injection Wells
- Haotian Wang (University of Texas at Austin) | Jongsoo Hwang (University of Texas at Austin) | Mukul M. Sharma (University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2019
- Document Type
- Journal Paper
- 461 - 472
- 2019.Society of Petroleum Engineers
- wellbore integrity, unconsolidated sands, sand control, water hammer, water injectors
- 6 in the last 30 days
- 216 since 2007
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A pressure pulse, known as a water hammer, can occur immediately after water-injection wells are shut-in for emergency or operational reasons. Large pressure pulses may cause wellbore-integrity problems such as sandface failure and sand production. We propose a new work flow to simulate water-hammer events, the resulting wellbore failure, and sand production in water injectors. On the basis of the results of this work flow, recommendations are made for wellbore design and shut-in protocols for water-injection wells.
For the first time, the results presented in this paper allow us to quantitatively understand the role of well shutdowns and subsequent water-hammer pressures on sand production. The failure of unconsolidated sands near the wellbore is affected by water-hammer events and their amplitude, period, and attenuation. If a water-hammer event occurs during the shut-in of water injectors, the extent of the sand failure becomes larger, and the failure zone continues to propagate along the stress-concentration direction. The simulation results clearly show the parameters that are important and suggest changes to well operations such as proper shut-in protocols that help to minimize the possibility of sand production. The results also suggest ways in which injectors can be designed to minimize the impact of water-hammer events.
|File Size||910 KB||Number of Pages||12|
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