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为解决煤层气活性水改造效果差的难题,基于煤层发育被方解石充填的天然裂缝网络、压裂液滤失量大的特性,提出了新的缝网压裂思路,研制与煤层相适应的复合压裂液体系。潜在酸压裂液酸蚀充填矿物,使裂缝恢复畅通,形成相连通的复杂裂缝网络;清洁压裂液携砂,支撑压开的裂缝。探讨了该思路的可行性和优势,以及与页岩气、砂岩气缝网压裂的区别。分析了沁水盆地南部3号煤和15号煤地质特征,研制了相应的潜在酸压裂液和清洁压裂液,形成"潜在酸酸蚀裂缝充填矿物,清洁压裂液携砂"的缝网压裂技术。与常规活性水压裂对比表明,3号和15号煤层缝网压裂产量高,见气普遍更早。3号煤压裂支撑剂用量更少,15号煤煤层气开发取得历史突破。实践表明煤层气缝网压裂具有可行性。 相似文献
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本文结合广东省阳茂高速公路总监办建立质量保证体系的经验,就公路工程监理质量保证体系的建立中中应注意的事项从组织结构、职责权限.工作程序和设备人员四个主要方面进行了探讨分析。 相似文献
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<正>The Brownian motion of a polystyrene bead trapped in a time-sharing optical tweezers(TSOT) is numerically simulated by adopting Monte-Carlo technique.By analyzing the Brownian motion signal,the effective stiffness of a TSOT is acquired at different switching frequencies.Simulation results confirm that for a specific laser power and duty ratio,the effective stiffness varies with the frequency at low frequency range,while at high frequency range it keeps constant.Our results reveal that the switching frequency can be used to control the stability of time-sharing optical tweezers in a range. 相似文献
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A novel realization of time-sharing optical tweezers (TSOT) is demonstrated using a tilt glass plate. Objects are trapped in the time-sharing dual traps; each of them acts like a single beam gradient trap with an effective stiffness. The effective stiffness of TSOT is experimentally measured through analysis of dynamical images. In comparison, it is numerically calculated by adopting the Monte Carlo technique. Both simulation and experimental results agree well with each other and show a good linear relationship between the effective stiffness and trap switching frequency in the range from 5 Hz to 70 Hz. 相似文献