Claw-sleeve type multi-stage cementing device
A technology of graded cement injectors and claw sleeves, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., and can solve problems such as complex assembly process, unstable product performance, and complex structure
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments in no way limit the present invention.
[0024] Such as figure 1 As shown, the claw-type step-by-step cementing device includes an upper joint 1, a cylindrical body 2, a sliding sleeve 3 fitted inside the cylindrical body 2, and closing sleeves that are sequentially fitted inside the sliding sleeve 3 and arranged at intervals from top to bottom. 5. Open the sleeve 6 and the anti-rotation sleeve 8; where,
[0025] The upper joint 1 is threaded on the top inner wall of the cylindrical body 2, and the cylindrical body 2 is fixed on the upper joint 1 by a plurality of fastening screws 4 arranged on the outer wall along the circumferential direction to prevent tripping; on the upper joint 1 The inner wall is provided with connecting internal threads for connecting casing strings; the inner diameter of the upper joint 1 i...
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