Flow string
A production pipe and casing technology, applied in the field of production pipe strings, can solve problems such as delay in construction progress, buckling of casing strings, and high frictional resistance of casing strings, and achieve the effects of reducing mutual wear and avoiding radial deviation
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[0023] Such as figure 1 and figure 2 As shown, this embodiment includes a casing 1 placed in the wellbore 2, and two floating collars 3 are arranged on the horizontal section of the casing 1, and the floating collars 3 include a casing 31, a fixed sleeve The sleeve 311, the upper sliding sleeve 32 and the lower sleeve 38, the fixed sleeve 311 is fixed on the upper part of the inner wall of the housing 31 through the upper shear nail 34, and the upper sliding sleeve 32 is composed of interconnecting parts connected with each other and the outer diameter is the same as the inner diameter of the housing 1. The shearing part is formed on the inner wall of the upper part of the fixed sleeve 311, the sliding sleeve 38 is supported on the lower part of the inner wall of the fixing sleeve 311 by the lower shear nail 37, and the lower sleeve 38 is supported on the housing 31 by the lower shear nail 37. In the lower part of the inner wall, the communicating portion is placed in the sl...
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