Casing centralizer and method for cementing construction
A technology of centralizer and casing, which is applied in the direction of casing, drill pipe, earthwork drilling, etc., and can solve problems such as inability to expand or shrink, large borehole wall wear, and pipe leakage
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[0033] Embodiment 1, with reference to Figure 1-3 , a casing centralizer for cementing construction mentioned in the present invention, comprising a connecting collar 1, a base pipe 2, and a first centralizing device, the first centralizing device is installed on the lower side of the base pipe 2, and the upper end of the base pipe 2 Install the connecting collar 1, which also includes an upper sealing device, a lower sealing device and a second centralizing device, the middle part of the base pipe 2 is provided with a second centralizing device, and upper sealing devices are respectively installed on both sides of the second centralizing device device and a lower sealing device, the upper sealing device includes an upper sealing cylinder liner 3, an upper sealing piston 4 and an upper hydraulic sealing rubber cylinder 8, the upper sealing cylinder liner 3 is fixed on the outer wall of the base pipe 2, and the upper sealing piston 4 is installed on the upper Seal the inner ca...
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