Experimental Study on Effect of Injected Drilling Fluid forBore Hole Collapse Prevention

Jung-Hyuk Choi; Chung-Sik Yoo; Yun-Su Han

doi:10.12814/jkgss.2016.15.4.053

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2016 Vol.15, Issue 4 Preview Page Next Page

Experimental Study on Effect of Injected Drilling Fluid forBore Hole Collapse Prevention 모형실험을 이용한 안정액 주입 시 공벽붕괴방지 효과 분석

30 December 2016. pp. 53-62

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Abstract

This paper presents the results of a reduced-scale physical model investigation into the effect of drilling fluid with different mix designs for use in offshore bore hole collapse prevention. Compare the bentonite and Attapulgite use. Reduced-scale model tests were then carried out considering field procedures for cases with decomposed granitic soil with fines and a sand with various drilling fluids with different mix designs. The results were indicated that the addition of polymer to the bentonite based drilling fluid decreases the amount of injected drilling fluid and increases the final depth of excavation. Also revealed that the effect of polymer on the performance of drilling fluid is more pronounced in the decomposed granite soil with fines than sand. Practical implications of the findings from this study are discussed in detail.

Keywords

Drilling fluid

Reduced scale model test

Bentonite

Bolehole

본 논문에서는 해상 시추 시 공벽붕괴 방지를 위해 적용되는 시추 안정액(drilling fluid)의 다양한 배합설계에 따른 공벽붕괴 방지 효과에 대한 실험적 연구 결과를 다루었다. 이를 위해 내염성점토와 벤토나이트 안정액의 공벽 붕괴 방지 성능을 비교하였으며 아울러 첨가제 혼합 시 안정액의 성능지표 변화에 대한 실험결과를 간략히 기술하였다. 또한 지반시추(굴착) 및 안정액 투입을 모사하는 토조 장치를 구축하여 세립분이 포함된 화강풍화토 및 모래지반을 대상으로 해수에 배합된 다양한 안정액에 대한 실험을 수행하고 안정액 투입량, 굴착가능 깊이 등을 측정하여 공벽붕괴 방지 효과를 고찰하였다. 그 결과 내염성 점토와 벤토나이트 모두 폴리머 첨가시 공벽붕괴 방지효과가 단일 안정액에 비해 증가하는 것으로 검토되었으며 첨가제로 CMC 보다 폴리머가 우수한 것으로 검토되었다. 본 논문에서는 도출된 연구결과가 실무적 차원에서 지니는 의미에 대한 내용을 기술하였다.

References

1.American Petroleum Institute 13A (2010), “ Specification for Drilling Fluids Materials”.

2.Fritz, P., Hermanns, S. and Heinz, R. (2002), “Modified Bentonite Slurries for slurry Shields in High Permeable Soils”, 4th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, pp.33-39.

3.Kwon, Y. H., Jun, S. K., Baek, S. J. and Ariyama, M. (1999), “A study on the mix design for stabilizing liquid of slurry wall”, Korean Concrete Institute Spring Conference, pp.457-462.

4.Han, Y. S., Choi, J. H., Yoo, C. S. and Jung, J. J. (2014), “Evaluationof Engineering Characteristics of the Drilling Fluid for Excavating the Marine Ground”, Korean Geo-Environmental Society fall Conference, pp.67-72.

5.Hong, W. P., Lee, M. K. and Lee, J. H. (2006), “Model Tests on Ground Deformation during Trench Excavation for Diaphram Walls”, Journal of KGS, Korean Geotechnical Society, December, 2006, Vol.22, No.12, pp.77-88.

6.JBAS (1977), “Japan Bentonite Manufacturers Association Standard”.

7.Lal, M. (1999), “Shale Stability: Drilling Fluid Interaction and Shale Strength”, Proceedings of SPE Asia Pacific Oil and Gas Conference, Society of Petroleum Engineers, pp.1-10.10.2118/54356-ms

8.Yoo, C. and Choi, J. H. (2014), “Development of Bore Hole Collapse Prevention Methodology using Drilling Fluild”, Report to Hyundai Heavy Industries.

9.Yoo, C., Choi, J. H. and Han, Y. S. (2015), “Experimental Study on the Effect of Drilling Fluid with Different Mix Designs for Bore Hole Collapse Prevention”, Journal of KGS, Korean Geotechnical Society, January, 2014, Vol.31, No.1, pp.15-24.10.7843/kgs.2015.31.1.15

Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 15
No :4
Pages :53-62
Received Date : 2016-07-13
Revised Date : 2016-11-22
Accepted Date : 2016-12-09
DOI :https://doi.org/10.12814/jkgss.2016.15.4.053

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

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