셰일암체의 저투과도 및 공극률 측정을 위한 실험장치 개발 및 활용
Development and Application of the Apparatus to Measure the Low Permeability and Porosity of Shale Matrix
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초록
저류층의 성공적인 개발을 위해서는 유체의 유동 특성과 저장능력을 파악할 수 있는 투과도와 공극률의 도출이 중요하다. 셰일가스의 경우, 전통적인 천연가스전과 비교하여 투과도와 공극률이 특징적으로 낮기 때문에 통상적인 물성 측정 기술을 적용하기에는 한계가 있다. 이에 본 연구에서는 비정상상태측정법 중 하나인 압력펄스감소법을 기반으로 저투과성 암체의 물성을 도출할 수 있는 실험 장치를 개발하였다. 개발된 장치는 국내 해남 우항리층에서 취득된 셰일 코어의 물성 분석에 이용되었으며, 각 시료의 투과도와 공극률을 도출하였다. 또한, 실험을 통해 얻어진 자료와 이론해 모델 간의 무차원 유사압력(dimensionless pseudo-pressure) 거동에 대한 회귀분석 결과, 모두 0.95 이상의 상관계수를 나타냈으며, 개발된 장치에 대한 높은 신뢰성을 확인할 수 있었다.
Abstract
To develop a shale gas reservoir successfully, it is important to measure permeability and porosity which are representative of flow characteristics and fluid storage. Conventional measurement methods are difficult to be applied to a shale gas reservoir, because porosity and permeability are extremely low compared to a conventional gas reservoir. In this study, an apparatus was developed for measuring low permeability and porosity based on a pressure pulse decay method. The apparatus was applied for measuring the porosity and permeability of shale core samples from Haenam Unhangri Formation in Korea. As a validation of the measurement, regression analysis was carried out using the dimensionless pseudo-pressure between the measured data and analytical solution. The results show the correlation coefficients above 0.95. Therefore, it is believed that the apparatus has a high accuracy.
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