Research On Key Construction Technology Of Water Curtain System Of Huangdao National Oil Reserve Underground Water Sealed Caverns Engineering

In the1970s, our country built the first bridge crude oil water sealed caverns for the total capacity of the150000Party in Huangdao, and a underground oil depots which the capacity is40000party at Zhejiang Xiangshan in the80’s, not by artificial water curtain, In recent years, with the development of economic and social development, China has delineated Zhejiang Zhenhai, near Hangzhou Bay, Huangdao, Shandong, Guangdong Zhanjiang and other major as strategic reserve base, are or will be the construction of a large number of setting artificial water curtain of underground water seal underground structure.The air tightness of water sealed caverns is crucial to the success of the project, water seal mode including natural groundwater and artificial water curtain in two ways. Engineering practice shows that the current method can completely control the oil and gas leakage is to use artificial water power water curtain closed, artificial water curtain system a decisive role in ensuring the safety of underground oil storage depot closures played in. Factors influencing the effect of artificial water curtain seal, in addition to water curtain system design, construction and maintenance, the permeability of the rock cavern is particularly critical. Permeability of rock mass will results in a water inflow in the hole is too high, will greatly increase the risk of underground structure construction and operation costs.Therefore artificial water curtain and leakage of underground structure control become underground petroleum reserve engineering design, construction and safety operation of the key technical problems. Artificial water curtain cave seepage control and become key technology problems to design, construction and safe operation of underground oil reserves in the project.The national oil reserve bases in Huangdao limited liability company organized the construction units collaborative research, systematically studied the key technology of large underground cavern of Huangdao water seal system, obtained results can provide the reference for the follow-up of the cavern construction.(1) to use the hydraulic test water curtain hole site, studied the hydraulics penetration mechanism of water curtain system, analysis of the field of comprehensive water curtain hole hydraulic test, three-dimensional fracture network seepage, seepage flow of dual media, we obtain accurate permeability parameters of Huangdao large seal oil tank water curtain system, and accurately solve complex conditions seal leaking oil caverns predictable technical problems.. (2) proposed a set of long horizontal borehole deviation control techniques.Using the technology improved the precision of pore of the horizontal drilling of large, solved the artificial water curtain hole construction of super long horizontal borehole deviation control technology problem, partial slope of the horizontal drilling of large control within the plus or minus2.3°, enhance the long horizontal borehole deviation control standards at home and abroad.(3) proposed a large seal cave excavation fine blasting technology and rising leak plugging technology of shell type prestressed hollow bolt pressure grouting, the formation of large water seal leakage preventing cave control innovation plugging technology combination to solve the artificial water infratentorial cavern leakage control key technical problems, reaching the cave depot water curtain system stability purposes.