伸缩叠合型柔性(袋)管取心内管的研究与应用

Research on Coring Inner-tube of Flexible Retractable and Folable Pipe（Bag）and the Application

摘要:

为解决刚性取心管采取岩心扰动度、水分保真度、取心率难以满足业主及设计部门要求的问题，研制了伸缩叠合型柔性(袋)管取心内管。通过分析比较柔性取心内管轴向和径向2种折叠方式对取心效果的影响，选用了轴向折叠方式的柔性取心内衬管。柔性取心内管的材质选用添加玻璃纤维丝的聚乙烯塑料。辅之配套使用高胎体底喷钻头、单向性罩爪簧的钻进工艺。通过在4种典型钻探项目中的试验，样品的扰动度＜5%，水分保真度＞95%，取心率达到了80%～95%。实践证明，应用伸缩式叠合型柔性（袋）管取心内管的三重管钻取特殊心样等原状样品，保真度高，采取率高，取心效果良好,有较好的推广应用价值。

Abstract:

A coring inner-tube of flexible retractable and foldable pipe (bag) has been developed to solve the problems caused by rigid coring tube, such as core disturbance, moisture retention and low core recovery. By the comparison of influence on coring effects by the flexible coring tube with axial and radial folding patterns, the axial one was selected. The flexible coring inner-tube is made of polyethylene plastic with glass wool, and employs the drilling technology with ancillary techniques of high matrix bottom jet bit and single way claw spring cover. In the tests of 4 typical drilling projects, the sample disturbance are lower than 5%, moisture retention higher than 95% and core recovery reaching 80%～95%. The practices show that by the triple-tube equipped with coring inner-tube of flexible retractable and foldable pipe (bag), special rock samples and the undisturbed samples can keep high fidelities and high recovery with perfect coring effect.