Abstract
References
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In this study, the optimization model was developed in order to examine the production rate of each layer in commingled reservoir where PLT has not been performed. By using the model, production rate was investigated in production well B and C which are on gas production throughout K&L, M, and P layers. Firstly, well logging and core data of production wells as well as DST data of exploration well A were analyzed to determine permeability of the K&L, M, and P layers. The permeabilities of each layer were evaluated as 9.7, 1.3 and 14.0 md by DST data which is concerned most reliable. The skin factors of the production well B and C were estimated as 2.98 and 0.15 by well test analysis based on the production data. The allocation of production rate in the production well B was determined as 44.7%, 4.9%, 50.4% and that in production well C was determined as 51.8%, 4.5%, 43.7% by applying the permeability, skin factor and bottomhole pressure to the optimization model. Since the allocation of production rate depends on the flow capacity of each layer and the pressure change during production, the difference between the allocation of production rate and flow capacity of the well C, which yields the greater pressure drop, is larger than that of production well B. Also, it was confirmed that the layers of K&L and P affect an important role in gas production by more than 95%.
본 연구에서는 PLT를 수행하지 않은 다중 가스전의 층별 생산량을 파악하기 위해서 최적화 모델을 개발하였으며, 이를 3개 저류층에서 동시에 생산을 실시하고 있는 생산정 B와 C에 적용하여 생산량을 규명하였다. 우선, K&L, M, P 층의 투과도를 결정하기 위해서 생산정의 물리검층해석자료, 코어분석자료, 탐사정의 DST 해석자료를 분석하였으며, 이중에서 가장 신뢰성이 있는 DST 해석자료에서 산출된 층별 투과도 결과를 이용하여 각각 9.7, 1.3, 14.0 md로 결정하였다. 한편 지층의 손상지수는 생산기간동안 취득된 생산자료를 바탕으로 유정시험해석을 통해 산출된 2.98과 0.15를 생산정 B와 C의 주변 지층의 손상지수로 적용하였다. 층별 투과도, 손상지수 및 정저압력을 최적화모델에 적용하여 층별 생산량 할당비를 산출한 결과, 생산정 B에서는 44.7%, 4.9%, 50.4%로 계산되었으며, 생산정 C의 경우는 51.8%, 4.5%, 43.7%로 산출되었다. 여기서 산출된 생산량 할당비는 유동능력뿐만 아니라 생산기간동안의 압력변화까지 고려한 것이므로 생산기간동안 압력변화가 큰 생산정 C가 B에 비해 생산량 할당비와 유동능력과의 차이가 크게 나타난 것으로 판단된다. 또한 산출된 층별 생산량을 통해 K&L과 P 층이 가스생산의 95% 이상을 차지함을 확인할 수 있었다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 46
- No :4
- Pages :482-489
Journal of the Korean Society of Mineral and Energy Resources Engineers
