고갈저류층 시추공 안정성 분석과 시추전략
Wellbore Stability Analysis and Drilling Strategy in Depleted Reservoir
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초록
석유생산 과정에서 저류층 공극압 감소는 현지응력 변화를 일으킨다. 고갈저류층의 추가시추는 저류층의 덮개암, 다층 저류층 구조 및 저류층 내의 생산성 차이로 인해 허용이수밀도범위가 좁다. 그 결과 초기 저류층 시추에 서 발견되지 않았던 압력차고착, 이수손실 및 저류층 손상 등의 시추공 안정성 문제가 발생할 수 있으며 이를 해결하기 위한 추가 작업 및 시추비용이 증가될 수 있다. 이러한 고갈저류층의 시추문제를 극복하고 성공적인 시추작업을 위해 서는 시추공 안정성 분석과 그에 따른 효과적 시추전략이 필요하다. 이 연구에서는 석유생산에 따른 시추공 안정성 평가를 위한 이론적 배경을 살펴보았다. 그리고 압력제어 시추법과 시추공 응력보강 등 고갈저류층 시추를 위한 시추 전략과 적용사례를 정리하였다.
Abstract
A decrease in reservoir pressure leads to change in the in-situ stress acting on the reservoir over the lifetime of the field as oil and gas are being produced. Drilling infill wells in the depleted reservoir may experience a narrow mud weight window due to presence of cap rock, stacked reservoir, and difference in production rate within the reservoir. Wellbore stability issues such as differential sticking, lost circulation, and formation damage that were not expected while drilling the initial production field could occur more frequently while drilling in depleted reservoir, which may contribute to increased drilling time and cost. Wellbore stability analysis and appropriate drilling strategies are required to overcome these drilling risks associated with depleted reservoirs for successful drilling operations. This paper describes the theoretical background of wellbore stability, drilling strategies, and case histories, i.e., managed pressure drilling and wellbore strengthening techniques, to drill through depleted reservoirs successfully.
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