Abstract
Coal reservoirs have characteristically low permeability and low pressure and are highly sensitive to damage during well completion. Therefore, systematic reservoir protection measures must be taken in the process of coalbed methane exploitation. However, in some areas such as the Qinshui basin, there is a contradiction between the sidewall stability of horizontal coalbed methane (CBM) wells and the protection of coal seams, which becomes the main technical bottleneck for the efficient development of CBM. Therefore, a double-pipe double-cycle rock carrying technology based on using a clean water drilling fluid is proposed, which can be applied to multi-branch horizontal wells of CBM, improve well completion efficiency and quality, realize reservoir protection, and increase single-well production. Field tests of this technology have been completed in wells ZS1P-5H and QS12P1H with satisfactory results. For example, the QS12P1H well was drilled with one main branch, 15 branches, and 33 pulse branches. The total depth of the well is 13,270 m, and the pure coal depth is 10,288 m. A single well of 10 km footage was realized without accidents, and the daily gas output was up to 10,000 m3.
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References
Dawei L, Wang Q, Wang Y et al (2013) Laboratory research on degradable drilling-in fluid for complex structure wells in coalbed methane reservoirs. Pet Explor Dev 40(2):232–236
Gentzis T (2011) Stability analysis of a horizontal coalbed methane borehole in the San Juan Basin. USA, Energy Sources, Part A: Recovery, Utilization and Environmental Effects 33(21):1969–1984
Gentzis C, Thomas (2009) Stability analysis of a horizontal coalbed methane well in the Rocky Mountain Front Ranges of southeast British Columbia. Int J Coal Geol:328–337
Jharkhand IK, Jaywardhan M et al (2018) Coalbed methane reservoir characteristics of coal seams of south Karanpura coalfield. Int J Coal Geol:185–200
Jihua C, Wang J, Ye Y et al (2012) Inhibitive ability appraisal of salt solution on coal rock. J China Coal Soc 37(6):951–956
Lei Q, Shen R, Hongchun H et al (2007) Drilling technology of multi-branch horizontal well. Acta Pet Sin 28(3):112–115
Qiansheng Y, Laifang Z, Guangzhong J et al (2010) Laboratory research on degradable drilling fluid for pinnate horizontal well based on coalbed methane. J China Coal Soc 35(10):1692–1695
Qiansheng Y, Jun C, Laifang Z et al (2012) Research on coalbed methane drilling fluid for horizontal well based on coal reservoir protection in Qinshui Basin. J China Coal Soc 37(S2):416–419
Shiqi L, Shuxun S, Mengxi L et al (2013) Key geologic factors and control mechanisms of water production and gas production diver-gences between CBM wells in Fanzhuang block. J China Coal Soc 38(2):277–283
Weian H, Zhengsong Q, Wang Y et al (2012a) Study on damage mechanism and protection drilling fluid for coalbed methane. J China Coal Soc 37(10):1717–1721
Weian H, Zhengsong Q, Wang Y et al (2012b) Study on damage mechanism and protection drilling fluid for coalbed methane. Journal of the China Coal Society:1717–1721
Yang H, Wang W, Zhonglan T (2014) Reservoir damage mechanism and protection measures for coal bed methane. Journal of the China Coal Society:158–163
Zhaoping M, Quanlin H (2012) Experimental research on stress sensitivity of coal reservoir and its influencing factors. J China Coal Soc 37(3):430–437
Zheng Y, Hongchun H (2002) Development of drilling and completion technology of coal-bed methane wells in China. Acta Pet Sin 23(3):81–85
Funding
This research was sponsored by the PetroChina Innovation Foundation (2017D-5007-0314).
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Responsible Editor: Santanu Banerjee
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Ran, X., Zhang, B., Wei, W. et al. Reservoir protection and well completion technology for multi-branch horizontal wells in coalbed methane. Arab J Geosci 14, 802 (2021). https://doi.org/10.1007/s12517-021-07157-5
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DOI: https://doi.org/10.1007/s12517-021-07157-5