A Study on a Hydraulic Parameter Evaluation by a Single Borehole Well Test

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2007 Vol.44, Issue 2 Preview Page Next Page

A Study on a Hydraulic Parameter Evaluation by a Single Borehole Well Test 단공식(單孔式) 투수시험에 의한 수리정수 평가에 관한 고찰: 김형목, 신중호, Kenichi ANDO
Hyung-Mok KIM, Joong-Ho SYNN and Kenichi ANDO

30 April 2007. pp. 135-144

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Abstract

In this paper, it was aimed to enhance an evaluation of hydraulic properties using a single borehole test in a deep underground. In terms of hypothetical data, the influence of lower permeable skin zone around a borehole as well as the effect of borehole wall collapse on the hydraulic properties was investigated. Conventional well test analysis without considering the lower permeable skin zone could produce an underestimation of hydraulic conductivity. As an identifying method of the skin zone, the well test with a series of multi-test events was proposed. Meanwhile, a borehole wall collapse influenced little on hydraulic conductivity but significantly on a specific storage. The change of borehole radius due to the borehole wall collapse could be identified during the residual analysis in a numerical history matching of a well test data.

Keywords

A single borehole well test

Skin zone

Borehole wall collapse

Numerical history matching

단공식 투수시험을 이용한 지하심부 암반의 투수특성 평가기술 개발의 일환으로 시추공 주변의 평가대상 암반보다 낮은 투수성의 스킨 영역과 공벽붕괴에 의한 시추공 반경 확대가 투수성 평가에 미치는 영향을 검토해 보았다. 수치모의시험 데이타를 이용한 검토 결과, 스킨 영역의 형성을 고려하지 않은 기존의 해석 방법에서는 대상 암반의 투수성이 과소평가될 수 있음을 확인하였다. 스킨 영역을 확인하는 방법의 일례로서 복수의 수위변동 과정으로 구성된 일련의 투수시험을 실시하는 것을 제안하였다. 또한, 수치해석적 최적화 기법을 통한 투수시험 자료 해석과정에서 얻어지는 잔차분석을 통해 공벽붕괴 등에 따른 시험구간 내 시추공 반경 변화를 역추정할 수 있음을 보였다.

키워드

단공식 투수시험

스킨 영역

공벽 붕괴

수치해석적 최적화 기법

References

성현정, 김용제, 이철우, 김구영, 우남칠, 2005, 균열암반에서의 양수시험자료 해석과 일반 방사상 유동모델의 적용성 연구, 자원환경지질, 38(2), pp. 177-185.
Bouwer, H. and Rice, R.C., 1976, A slug test method for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells, Water Resources Research, Vol. 12, No. 3, pp. 423-428.
Cooper, H. H., Bredehoeft, J. D., and Papadopulos, S. S., 1967, Response of a finite-diameter well to an instantaneous change of water, Water Resources Research, Vol. 3, No. 1, pp. 263-269.
HydroSOLVE INC., 2003, AQTESOLV for windows, User’s Guide, Reston, VA.
INTERA Inc., 1996, GTFM-User Documentation: Final Description, Theoretical Development, and Software Architecture: Internal Report.
Theis, C. V., 1935, The relation between the lowering of the piezometric surface and the rate and duration of discharge of a well using groundwater storage, American Geophysical Union Trans., Vol. 16, pp. 519-524.
西垣誠ら, 1986, 単孔式透水試験法の問題点の検討と改良, 地下水と井戸とポンプ, Vol. 28, No. 9, pp. 1-10.

Information

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 : 44
No :2
Pages :135-144

[1] 성현정, 김용제, 이철우, 김구영, 우남칠, 2005, 균열암반에서의 양수시험자료 해석과 일반 방사상 유동모델의 적용성 연구, 자원환경지질, 38(2), pp. 177-185.

[2] Bouwer, H. and Rice, R.C., 1976, A slug test method for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells, Water Resources Research, Vol. 12, No. 3, pp. 423-428.

[3] Cooper, H. H., Bredehoeft, J. D., and Papadopulos, S. S., 1967, Response of a finite-diameter well to an instantaneous change of water, Water Resources Research, Vol. 3, No. 1, pp. 263-269.

[4] HydroSOLVE INC., 2003, AQTESOLV for windows, User’s Guide, Reston, VA.

[5] INTERA Inc., 1996, GTFM-User Documentation: Final Description, Theoretical Development, and Software Architecture: Internal Report.

[6] Theis, C. V., 1935, The relation between the lowering of the piezometric surface and the rate and duration of discharge of a well using groundwater storage, American Geophysical Union Trans., Vol. 16, pp. 519-524.

[7] 西垣誠ら, 1986, 単孔式透水試験法の問題点の検討と改良, 地下水と井戸とポンプ, Vol. 28, No. 9, pp. 1-10.

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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