셰일가스 저류층의 재수압파쇄 적용 시기 선정 연구
Determination of Application Time for Refracturing in Shale Gas Reservoirs
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초록
최근 몇 년 간 저유가가 지속됨에 따라 유·가스전 운영사들은 적은 투자로 생산성을 높이기 위해 셰일가스 생산정에 재수압파쇄를 적용하고 있다. 하지만, 재수압파쇄는 적용 시기에 따라 가스생산량과 물생산량이 달라지므 로 적합한 적용 시기를 파악하는 것이 중요하다. 이 연구에서는 경제성 평가를 수행하여 순이익이 최대가 되는 재수압 파쇄 적용 시기를 파악하고자 하였으며 이를 위해 셰일가스 저류층의 재수압파쇄 시기에 따른 누적가스와 물생산량 을 도출하였다. 그 결과 재수압파쇄 적용 시기가 이를수록 누적가스생산량과 물생산량이 증가하는 경향이 있었고 이 는 초기 수압파쇄수의 잔존에 의한 저류층 수포화율이 높아 물생산량이 증가한 것으로 확인하였다. 이로 인해 물처리 비용이 증가하여 재수압파쇄 적용시기에 영향을 미치는 것을 확인하였으며 재수압파쇄 시기 선정 시 물처리 비용에 대한 충분한 고려가 필요할 것으로 판단된다.
Abstract
The current low oil price environment has driven oil and gas industry operators to consider refracturing their previously underperforming shale gas production wells to boost productivity with lower investment. However, it is important to determine the proper application time for refracturing as the gas and water productions vary by the application period. This study analyzes the cumulative gas and water production in a shale gas reservoir based on the refracturing application period. An economic evaluation was performed to identify the application period for refracturing that would yield the maximum net income. Applying refracturing at early stages had a tendency to increase the cumulative gas and water production from injected water that remained in the reservoir which increased the water saturation. Therefore, the wastewater cost increased and would need to be considered in order to determine the application period for refracturing.
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