Practice of Fuzzy-Ball Drilling Fluid Technology in Qinping CBM Well 12-11-3H with Six Branch Holes

Abstract:

The 3# high rank coal in Qinshui basin frequently takes place of falling block, sloughing hole, leaking and pipe-stuck during drilling operation. The third open of 12-11-3H well in Qinping is consist of 2 main-branch and 6 sub-branch, using fuzzy-ball drilling fluid for 3 days accomplishing a footage of 4 189.49m. In order to adjust performance of drilling fluid, mix 4 fuzzy-ball drilling fluid additives SDS, SDBS, HES PAM together according to different well condition. The density of this drilling fluid is from 0.96 to 1.08g/cm³. The plastic viscosity of it is from 7 to 17mPa^.s, the yield value is from 4.0 to 10.22Pa. After using this fuzzy-ball drilling fluid, the drilling rate has increase to 95%, completing the geological demand with an average drilling rate of 12.65m/h. Compared with adjacent well, the drilling rate has been raised 11.55% with no serious falling block, sloughing or leaking in whole well. However the solid control equipments still need to be strengthened for further improving drilling rate and economic benefits.

• Periodical: Applied Mechanics and Materials (Volumes 423-426)
• Pages: 649-652
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.423-426.649
• Online since: September 2013
• Authors: Jin Bang Cui, Ji Hong Zhang*, Qing Zhong Zhu, Bi Wu Chen
• Keywords: Coalbed Methane (CBM), Fuzzy-Ball Drilling Fluid Application, Multi-Branch Horizontal well

References

[1] Zhang Peihe. Characters of distribution and influencing factors about the reservoir pressure in Qinshui Coalfield. Coal Geology & Exploration, 30(6): 31-32(2002).

[2] BaoGuiquan. Study on Some Focal Technical Problems of Drilling Engineering for Coal Bed Methane. Exploration Engineering(Rock & Soil Drilling and Tunneling), 12: 4-8(2007).

[3] ZhengLihui, KongLingchen, Cao Yuan et al. The mechanism for fuzzy-ball working fluids for controlling & killing lost circulation. Chinese Science Bull, 15(55): 1210-1228(2010).

DOI: 10.1007/s11434-010-3202-8

[4] ZhengLihui, Zhang Mingwei. Review of basic theory for lost circulation control. Oil Drilling & Production Technology, 34(5): 1-9, (2012).

[5] Li Liangchuan, Lu Shuqing, Peng Tong, et al. Fuzzy-Ball work-over fluids for formation damage control in Jidong Oilfield. Oil Drilling & Production Technology, 33(3): 31-34, (2011).

[6] Wang Degui, He Yuyun, Bu Yuan et al. Practice of fuzzy-ball drilling fluid technology in Well Ji X coal bed methane. Oil Drilling & Production Technology, 33(5): 93-95, (2011).

[7] Mengshangzhi, Dou zhenghui, Liu bin et al. Fuzzy Ball Drilling Fluid Technology inCBM of Multilateral Horizontal Well FL-H2-L with Five Branch Holes. Drilling Fluid & Completion Fluid, 29(1): 5-8, (2012).

[8] Sun Fapei, Zhang Jie, Li Jian et al. Soft capsule Drilling Fluid Technology for 215. 9mm CBM Well and Horizontal Well. China Coalbed Methane, 9(2): 18-21, (2012).

[9] ZhengLihui and Zhao Xionghu: An Introduction to Drilling Fluid (China University of Mining and Technology Publication, China 2008, In Chinese).

[10] ZhengLihui, Cao Yuan, Han Zixuan. Novel low-density drilling fluid containing fuzzy ball structure. ActaPetroleiSinica, 31(3): 490-493. (2010).

[11] Zheng Lihui, Wan Xianghui, Chi Lijun, et al. A nover multifunctional bionic fuzzy-ball drilling fluid, Advanced Materials Research, v 236-238, pp.608-615, 2011, Application of Chemical Engineering.

DOI: 10.4028/www.scientific.net/amr.236-238.608