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Plug for sealing and used for several times
The utility model relates to an underground tool for packing an oil layer, which is characterized in that the utility model is provided with a re-setting mechanism, and a free end is arranged betweenExpand
An oil well downhole reservoir ground control horizontal drilling apparatus
Technical Field The present invention relates to oil production engineering, reservoir oil wells belonging to one level of the ground control downhole drilling apparatus. The present invention is toExpand
Multiple-hole group type nozzle for deep penetration hydraulic windowmaker
The utility model relates to a nozzle for a deep penetration hydraulic perforator for oil wells. A front-cutoff conical surface with a conical tip angle of 90 DEG is arranged on the periphery of aExpand
Rigid centralizer for straight well and directional well
A rigid centralizer for straight well and directional well relates to an oilfield underground tool centralizing device designed to overcome disadvantages of present centralizers that have large outerExpand
Ground-driven underground horizontal boring method for oil well
The invention relates to the technical field of oil production engineering and belongs to a ground-driven underground horizontal boring method for an oil well. The invention aims to solve the problemExpand
Diagnostic value of the ratio of ligamentum flavum thickness to oblique diameter of lumbar canal in patients with ligmentum flavum hypertrophy
目的 探讨黄韧带厚度与椎管斜径的比值对黄韧带肥厚致椎管狭窄诊断的优越性.方法Expand