CXS和XNS型坐落短节随完井管柱下入井中，为井下流动控制工具提供精确的坐 落位置，CXS和XNS型坐落短节适用于标准磅级的油管。

完井时可根据需要，在管柱上以任意次序下入任意多个相同内径的坐落短节，这样就可以在管柱内提供任意多个位置来坐落和锁定井下流动控制工具。流动控制工具与配套的锁紧心轴通过钢丝携带的下入工具一起下入井中。

钢丝作业者选用相应的下入工具，可将流动控制工具坐落在预定深度某一个坐落短节上。如果这个坐落位置不合适或者井况发生了变化，可以通过钢丝作业将流动控制工具上提或下放到管柱内另外一个合适的坐落短节上，而且这个过程并不需要压井。

XNL型坐落短节用于使用单一坐落短节的情况，也可以用于CXS型坐落短节串的 最下部。对于同一规格的油管管柱， XNS型与CXS型坐落短节内径相同。(N代表止动短节)

主要特性

◎ 大内径，降低流动限制；

◎ 相同的内部剖面结构使短节更通用。

主要优点

◎ 多功能性，可降低完井和生产维护成本；

◎ 操作简单；

◎ 下入、定位和回收井下流动控制工具的方式有多种选择。

应用

◎ 悬挂测量工具，测井底温度、压力等；

◎ 几乎可以在任意位置坐落和锁定井下流动控制工具。

LANDING NIPPLE

INTRODUCTION

Model CX and CXN landing nipple are run in wellbore in conjunction with completion string, exact landing position is provided for wellbore flow control tool. CX and CXN type landing nipple are applicable for standard grade tubing.

Multi-same ID landing nipple can be run at will in the string at a will order. Many positions at discretion are provided by string to set and lock wellbore flow control tool. Flow control tool is run in wellbore in conjunction with lock nipple by a wireline service tool.

Service tool is selected by operator accordingly. Flow control tool can be set on the designed depth of certain landing nipple. If the position is not suitable or wellbore condition has changed, another suitable landing nipple can be found by pulling or tripping in flow control tool through slickline operation, and it is unnecessary to kill well during the whole operation.   Model CXN landing nipple is used for the single landing nipple operation. It can also be used at the bottom of CX landing nipple string. The ID of CXN and CX is the same for the same specification tubing string.

FEATURES

◎ Large ID, reduce flow restrict;

◎ More commonly used for the same inner section configuration.

BENEFITS

◎ Multi-function, it can reduce completion and maintenance cost;

◎ Easy to operate;

◎ Mach choice can be selected to run, land and retrieve flowing control tool.

APPLICATION

◎ Hanging testing tool;

◎ Wellbore flow control tool can be set and locked at any position.

Note: Other specification products are available.