Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： H8b gas reservoir of well hy-A1 in the East China Sea has an abnormally high temperature andhigh pressure formation.The predicted fracture initiation pressure of fracturing design is inconsistent withthat of fracturing operation , resulting in high fracture initiation in operation. In this paper , the mathematicalmodel of high fracture initiation pressure of low permeability reservoir in the East China Sea is establishedby considering the factors of fluid pressure in fracture , including principal stress, wellbore permeability,and fracture dip angle.On-the-spot verification showed that the difference was 4.9% . With the help of di-chotomy , the model is solved , and the results show that with the increase of well deviation , the fracture ini-tiation angle decreases; with the increase of azimuth , the fracture initiation angle increases first and thendecreases until zero, and the fracture initiation pressure generally decreases first and then increases ; withthe increase of azimuth , the fracture initiation pressure has the lowest peak value , and the azimuth of thelowest peak value range is between 50� and 80�. When the azimuth angle is 71� in 0皏ertical well sec-tion , the peak value of minimum initiation pressure is 58.5 MPa;there is a maximum initiation angle in acertain azimuth angle , and the azimuth angle between the maximum initiation angle and the peak value isbetween 60� and 80�. Large stress difference ,small Poisson's ratio and abnormal high pressure are the keyfactors of high initiation pressure.In fracturing design , the azimuth angle and deviation angle should be asclose to the minimum force area of initiation pressure as possible.
Subjects: Library Science，Information Science >> Information Science submitted time 2018-08-14 Cooperative journals: 《智库理论与实践》
Abstract：[目的/意义] 独立性是智库的核心价值之一，本身具有复杂性和相对性，难以进行量化。目前国内对智库独立性的研究较少，需要进一步讨论。 [方法/过程] 本文通过对美国、英国、日本3国智库独立性及保持独立性方面的举措进行比较分析，阐述我国现阶段智库独立性建设存在的问题，并提出相应建议。［结果/结论］我国在建设中国特色新型智库过程中需要推动各类智库协调发展，完善智库登记管理的相关法律法规，引导企业和个人向智库捐款，加强对各类智库的监督管理。
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