Initial application of intense repeated pulse wave for stimulating CBM reservoirs

doi:10.3969/j.issn.1672-7703.2019.03.013

Abstract

Abstract: CBM (coalbed methane) reservoirs are usually developed by hydraulic fracturing stimulation. However, it is less effective to improve the natural fracture system in coalbeds and results in lower production of vertical CBM wells. By applying intense repeated short pulses to the liquid-solid interface, coal rock can be broken and fractured due to the fact that solid is more prone to break than liquid. It is worthy to focus on how intense repeated pulsed wave can improve the natural fracture network in coalbeds. In this study, intense repeated pulse wave was applied to stimulate CBM reservoirs, and the results were evaluated by considering well test interpretation on the improvement of matrix permeability, fracture system and fracturing stimulation. Field tests show that intense repeated pulse wave plays an active role in increasing coal rock permeability and improving induced fractures. It is an effective method for stimulating CBM reservoirs.

Key words: coalbed methane, pulse wave, fracturing, well test, permeability

CLC Number:

Guo Zhidong, Zeng Wenting, Fang Huijun, Ge Tengze, Han Jun, Lin Jingde. Initial application of intense repeated pulse wave for stimulating CBM reservoirs[J]. China Petroleum Exploration, 2019, 24(3): 397-402.

References

[1] 倪小明,苏现波,张小东.煤层气开发地质学[M].北京:化工工业出版社,2009. Ni Xiaoming, Su Xianbo, Zhang Xiaodong. Coalbed methane development geology[M]. Beijing:Chemical Industry Press, 2009.
[2] 李相方,蒲云超,孙长宇,任维娜,李莹莹,张亚琦,等.煤层气与页岩气吸附/解吸的理论再认识[J].石油学报,2014,35(6):1113-1129. Li Xiangfang, Pu Yunchao, Sun Changyu, Ren Weina, Li Yingying, Zhang Yaqi, et al. Recognition of absorption/desorption theory in coalbed methane reservoir and shale gas reservoir[J]. Acta Petrol Sinica, 2014,35(6):1113-1129.
[3] Han Guoping, Ling Kegang, Zhang He. Smart de-watering and production system through real-time water level surveillance for coal-bed methane wells[J]. Journal of Natural Gas Science and Engineering, 2016,31:769-778.
[4] Wan Yizhao, Liu Yuewu, Ouyang Weiping, Liu Wenchao, Han Guofeng. Desorption area and pressure-drop region of wells in a homogeneous coalbed[J]. Journal of Natural Gas Science and Engineering, 2016,28:1-14.
[5] Moridis G J. Numerical Studies of Gas Production From Methane Hydrates[J]. SPE Journal, 2003,8(4):359-370.
[6] Zuber M D, Reeves S R, Jones A H. Variability in coalbed methane well performance:a case study[J]. Journal of Petroleum Technology, 1991,43(4):468-475.
[7] 邱爱慈,张永民,蒯斌,吕晓琳,汤俊萍.高功率脉冲技术在非常规天然气开发中应用的设想[C]//中国工程院,国家能源局.第二届能源论坛.煤炭工业,2012:22-24. Qiu Aici, Zhang Yongmin, Kuai Bin, Lv Xiaolin, Tang Junping. The application of high power pulse technology in unconventional gas development[C]//Chinese Academy of Engineering, National Energy Administration. second energy BBS. Coal Industry, 2012:22-24.
[8] 周晓亭,秦勇,李恒乐,张永民,邱爱慈.电脉冲应力波作用下煤体微裂隙形成与发展过程[J].煤炭科学技术,2015,43(2):127-143. Zhou Xiaoting, Qin Yong, Li Hengle, Zhang Yongmin, Qiu Aici. Formation and development of coal micro-fractures under stress wave induced by electrical impulses[J]. Coal Science and Technology, 2015,43(2):127-143.
[9] 秦勇,邱爱慈,张永民.高聚能重复强脉冲波煤储层增渗新技术试验与探索[J].煤炭科学技术,2014,42(6):1-8. Qin Yong, Qiu Aici, Zhang Yongmin. Experiment and discovery on permeability improved technology of coal reservoir based on repeated strong pulse waves of high energy accumulation[J]. Coal Science and Technology, 2014,42(6):1-8.
[10] 邱爱慈.中国电气工程大典[M].北京:中国电力出版社,2009. Qiu Aici. Chinese electrical engineering major[M]. Beijing:Chinese Electrical Engineering Major, 2009.
[11] 张永民,邱爱慈,周海滨,刘巧珏,汤俊萍.面向化石能源开发的电爆炸冲击波技术研究进展[J].高电压技术,2016,42(4):1009-1017. Zhang Yongmin, Qiu Aici, Zhou Haibin, Liu Qiaoyu, Tang Junping. Research progress in electrical explosion shockwave technology for developing fossil energy[J]. High voltage technology, 2016,42(4):1009-1017.
[12] 李恒乐,秦勇,张永民,师庆民,周晓亭.重复脉冲强冲击波对肥煤孔隙结构影响的实验研究[J].煤炭学报,2015,40(4):915-921. Li Hengle, Qin Yong, Zhang Yongmin, Shi Qingmin, Zhou Xiaoting. Experimental study on the effect of strong repetitive pulse shockwave on the pore structure of fat coal[J]. Journal of China Coal Society, 2015,40(4):915-921.
[13] 刘能强.实用现代试井解释方法:5版[M].北京:石油工业出版社,2008. Liu Nengqiang, Practical modern well test method:5th edition[M]. Beijing:Petroleum Industry Press, 2008.
[14] 张琪.采油工程原理与设计[M].东营:石油大学出版社,2003. Zhang Qi. Principle and design of oil recovery engineering[M]. Dongying:Petroleum University Press, 2003.
[15] Bearinger D, Majcher M. Controls on mannville coolbed methane production in fort assiniboine/alberta[R]. SPE 137924, 2010.
[16] Schroeter T V, Hollaender F, Gringarten A C. Deconvolution of well-test data as a nonlinear total least-squares problem[J]. SPE Journal, 2009,9(4):375-390.
[17] Schroeter T V, Hollaender F, Gringarten A C. Analysis of well test data from permanent downhole gauges by deconvolution[R]. SPE 77688, 2002.
[18] Schroeter T V, Gringarten A C. Superposition principle and reciprocity for pressure transient analysis of data from interfering wells[J]. SPE Journal, 2009,14(3):488-495.
[19] Levitan M M. Practical application of pressure-rate deconvolution to analysis of real well tests[J]. SPE Reservoir Evaluation & Engineering, 2005,8(2):113-121.
[20] Levitan M M. Deconvolution of multiwell test data[J]. SPE Journal, 2007,12(4):420-428.