Research on Hole Making Mechanism of High Pressure Hydraulic Perforation

Abstract:

In this paper, we integrated use hydraulics, seepage flow mechanics, rock mechanics, and finite element simulation analysis and other methods to study the rock fragmentation mechanism of high pressure water jet. We make tensile stress - crack expansion comprehensive rock fragmentation model for the screw drilling of high pressure water jet. We make finite element simulation according to the mechanism of integrated model of high pressure water jet process, to analysis the internal rock stress distribution and external rock stress distribution of the fluid, and come to the reasonable number of high-pressure water jet nozzle hole. It is verified by the high pressure water jet breaking rock inside experiments of tensile stress - comprehensive rock fragmentation fracture expansion model, summarizes the law of high pressure water jet breaking rock, and we get to know reasonable drilling mode of the high pressure water jet is screw drilling with pitch of 120mm. At present there are two main types of the micro mechanism of the high pressure water jet. One is stress and tensile damage, because of the action produced by stress wave of the high pressure water jet impacting on rock, which mainly makes the tensile failure of rock; another one is crack expansion damage, under the effect of quasi static pressure radiation of water jet, the coupling effect between water shooting jet and rock pore skeleton, which make the rock pore, throat, and micro cracks expanding gradually, eventually the macro damage.

• Periodical: Applied Mechanics and Materials (Volume 590)
• Pages: 96-100
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.590.96
• Online since: June 2014
• Authors: Hai Cheng Li*, Xu Jing Zhang, Fu Min Liang
• Keywords: Finite Element Analysis (FEA), Hydrau-Perforation, Rock Breaking Mechanism, Tapping the Potential of Residual

References

[1] Li Gensheng, Shen Zhonghou. Advances in researches and applications of water jet theory in petroleum engineering [J]. Petroleum Exploration and Development, 2005, 32(1): 96-99.

[2] Wang Shimin, Zhu Hehua, Feng Xiating, et al. Influence of heterogeneity on macroscopical crack form of the brittle rock [J]. Rock and Soil Mechanics, 2006, 27(2): 224－227.

[3] Daniel L M. Experimental studies water jet impact on rock and rocklike materials[R]. Proceeding of the 3rd International Symposium on Jet Cutting Technology, Chicago U S A, (1976).

[4] Dong Zhiyong Concussion Jet [M]. Chinese Ocean Publishing Company, 1997. 9.

[5] Rui Yongqin, Tang Chun-an. Numerical simulation on failure process of rock sample with RFPA2D code under direct shear test [J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(3): 364-368.

[6] Yang Tianhong, Tang Chun-an, Liang Zhengzhao, et al. Study on model of damage and flow coupling in brittle rock failure process [J]. Acta Mechanica Sinica. 2003, 35(5): 533-541.

[7] Li Gensheng, Shi Huaizhong, Shen Zhonghou, et al. Mechanisms and tests for hydraulic pulsed cavitating jet assisted drilling [J]. Petroleum Exploration and Development, 2008, 35(2): 239-243.

[8] Yang Yongyin, Shen Zhonghou, Wang Ruihe. Analysis of the mechanisms of improving ROP using low pressure pulse jetting techniques in under-balanced drilling [J]. Petroleum Drilling Techniques, 2002, 30(5): 15-16.

[9] Xu Tao, Tang Chun-an, Zhang Zhe, et al. Theoretical, experimental and numerical studies on deformation and failure of brittle rock in uniaxial compression[J]. Journal of Northeastern University (Natural Science), 2003, 24(1): 87－90.

[10] Liang Zhengzhao, Tang Chun-an, Zhang Yongbin, et al. On probability model of physico-mechanical parameters of quasi-brittle materials and associated mechanical failure behaviors [J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(4): 718-727.