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krC-A型压差式双级注水泥器为内关闭式结构，不需投重力塞，通过液体的压力差打开循环孔，关闭塞带动关闭套下行关闭循环孔。
The krC-A Hydraulic Stage Cementer features inner closing structure, opening through pressure difference. The closing plug drives the closing sleeve down and then shut circulation ports.
特 点
1、打开压力可以调节，且打开动作不受井斜的影响。
2、碰压后即可打开循环孔，打开、关闭 动作时均不存在小腔液体压缩问题。
3、上下接头内径与套管内径一致，但小于关闭套内径，起下钻及钻除作业时可有效保护关闭套，使其免受损伤。
4、全部配件均由可钻性好的橡胶/铝质材料制成。且具有防转机构，方便钻去。
Features
1. Opening pressure can be adjusted and it is not subjective to hole angle or mud properties for operation.
2. The pressure-relief design prevents fluid trapping and compression during the closing phase of the tool’s operation.
3. The I.D. of upper/lower sub is the same as that of casing, but smaller than that of closing sleeve, which can minimize chances of damages to the closing sleeve.
4. The inner seats are made of an easily drillable butyronitrile rubber/aluminum material. Both the opening and closing seats lock against rotation for easy drillout.
技 术 参 数 Technical Parameters
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规 格, Specifications, mm (in)
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Φ139.7 (5½")
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Φ177.8 (7")
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Φ244.5 (9⅝")
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最大外径, Max O.D., mm
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Φ170
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Φ208
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Φ283
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通 径, Drill-out I.D., mm
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Φ122
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Φ155
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Φ220
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总 长, Overall Length, mm
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1082
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1182
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1222
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额定负荷, Rated Load, t
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140
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170
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210
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密封能力, Sealing capacity, MPa
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25
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25
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25
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打开压力, Opening Pressure, MPa
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13
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13
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13
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关闭压力, Closing Pressure, MPa
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5
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5
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5
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下滑套内径, Lower Sliding Sleeve I.D., mm
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Φ85
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Φ115
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Φ176
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上滑套内径, Upper Sliding Sleeve I.D., mm
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Φ95
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Φ125
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Φ197
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产品介绍
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