The casing float shoe is used in large displacement well completion in oil fields. Technically, it uses a sealing device to seal a certain amount of lightweight liquid or gas inside the casing to reduce the weight of the entire casing string in the drilling fluid, thereby effectively reducing the friction between the casing and the wellbore, solving the problem of difficulty in running casing during large displacement well completion. It features a simple and practical structure, can reduce friction to allow the casing to be run smoothly into place, and can be widely used in large displacement well completion operations in oil field drilling.
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Expanding shoe can overcome wellbore obstacles and guide casing or pipeline to the predetermined depth. It has a shorter profile and optimal cutting structure, enabling it to mitigate any predictable or unpredictable difficulties encountered during casing or pipeline running.
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The main function of the casing shoe is to act as a casing guiding device, connected to the lower end of the casing, to ensure that the casing does not pierce the well wall during casing running, allowing the casing to enter the well smoothly.
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Float shoes, hoops, and stoppers
Casing float shoes and floats are highly temperature-resistant, have good sealing and drillability, and are easy to connect, thus replacing guide shoes and casing shoes. Float shoes or floats can be used not only for general technical casing and oil-bearing casing but also for deep wells, ultra-deep wells, and special process wells. Plugs play a role in isolating drilling fluid and cement slurry and pressure in cementing operations. Plugs are divided into top plugs and bottom plugs, both of which have protruding anti-rotation petal shapes at the front end, and the bottom plug has concave petal shapes at the top end. The difference between the top plug and the bottom plug is that the bottom plug has a burst disk.
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Insert-type float shoes, float hoops
Insertable float shoes and float collars offer good high-temperature resistance, sealing, and drillability, and are easy to connect. They are used for general technical casing and oil layer casing, and can also be used in deep wells, ultra-deep wells, and special process wells. Insertable float shoes belong to the category of inner-tube cementing. They consist of a shell, cement, an automatic grouting valve, an insertion joint, an O-ring seal, and an insertion seat.
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