For the deep abrasive layer of the Xujiahe River in the low-permeability gas tight gas reservoir, the innovative design of the drill bit uses columnar vertical and horizontal impregnated teeth to enhance the anti-abrasive and attack performance of the drill bit. Before entering the well, the technicians went deep into the drill bit manufacturing plant, the drilling company, and the scientific research university, fully demonstrated the technical measures and emergency plans for the drill bit into the well, and optimized the drilling parameters in real time according to the working conditions. The drill bit was the second well test in the Yangshen-1 well. The total drilling footage was 262.36 meters. The shale and sandstone were mainly drilled and a small amount of gravel layer was drilled, which further verified the adaptability of the drill bit in the Xujiahe section.
In recent years, the Southwest Engineering Institute has worked hard to reduce costs and increase efficiency and improve drilling speed. The new impregnated diamond drill bit "T1-SP281" independently developed and improved the drilling speed breakthrough, breaking the situation that the deep Xujiahe Formation relied on imported drill bits, and the cost of a single drill bit was reduced by 30%, speeding up, reducing costs and increasing efficiency. The aspect explores a path of independent innovation.
Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable Welding Neck Flanges.
Lap joint flange is having two components, a stub end, and a loose backing flange. Stub end is butt welded to the pipe and Backing flange freely move over the pipe. The backing flange can be of different material than stub material and normally of the carbon steel to save the cost. Lap flange is used where frequent dismantling is required, and space is constrained.
Furthermore, a standard lap joint flange will typically have a longer hub length in comparison to a slip on flange, but this is often considered unnecessary for many applications.
The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.
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