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China Cased hole DST tools round mandrel slip joint manufacturer


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Product Detail

Model No.: Top-slip joint-01
Production Capacity: 10sets/month
Delivery Date: 35days
Working Temperature: 400F
Type: Full bore
Condition: NEW
Size: 5"
Means of Transport: Ocean,Land,Air
Packing: plywood
Working pressure: 105Mpa
Material: AISI41XX/Inconnel
Use: Slip Joint
Standard: Nace MR0175/ISO
Application: well testing

Drill stem testing tools round mandrel slip join is for cased hole full bore type in size 3 7/8" and 5" in owrking pressure 105Mpa,5ft choke length

Brief introduction

The round mandrel slip joint, like other slip joints, accepts the movement associated with ocean heave or temperature change without allowing the movement to disturb the placement of downhole tools.

The round mandrel slip joint has the following characteristics:

• Top of the mandrel slip joint has 4 3/4-in. (120.65-mm) drill collar profile for easy handling with the rig elevators and slips

• Maintains its full tensile rating when collapsed and locked

• Can be locked in the closed position for handling, reducing the risk of damage to the lifting/sealing mandrel

• Internally pressure and volume balanced

• String can be picked up with the slip joint locked; the slip joint can then be unlocked before it is run into the hole

• Provides free travel in the string to reciprocate tools without unseating the packer

A slip joint operates by balancing its volume. As the slip joint stretches and increases its internal volume, a differential piston within the slip joint allows the same volume of fluid into the pipe. The net result is no change in internal volume.

Each slip joint has 5 ft (1.52 m) of travel but can be combined with other slip joints to provide additional travel.

When multiple slip joints are run, they are normally connected to one another rather than located throughout the pipe string. The number of slip joints required depends on ocean heave and the amount of expected contraction and expansion.

Features and Benefits

• Provides a variable-length joint to allow the pipe to expand and contract during testing or stimulation

• Keeps vertical movement of the drilling vessel from disturbing tool placement

• Helps space out the testing string when the subsea tree is landed

• Provides a constant weight on the packer during testing or stimulation


The weight of the toolstring (excluding tools, anchor, and traveling blocks) is used to determine the location of the slip joint. Once the necessary packer-setting weight is shown on the weight indicator, the slip joint is placed into the string.

When multiple slip joints are used, the top joint makes its complete travel, then the next joint down makes its travel,and so on. The weight indicator may show a slight bump as each slip joint reaches the end of its travel.

A pressure test can be performed on the entire 5-ft (1.52-m)length of the sealing mandrel OD.








Bore Diameter






Stroke Length



Working pressure



Internal pressure strength



External pressure strength



Tensile strength



Torque strength




H2S,NACE MR0175(>175oF)


Working temperature



Connection thread

3 7/8CAS. BXP or 3 1/2 IF.BXP

Cased hole Drill stem testing tool Round mandrel slip joint
Round mandrel slip joint pressure testing chart

Cased hole Drill stem testing tool Round mandrel slip joint

Material Testing Traceability(SGS)

ZZ TOP OIL TOOLS is the professional manufacturer for the drill stem testing tools and surface testing equipment. All the DST tools are conformed with NACE MR 0175 with traceability,and the DST tools can be worked in H2S & CO2 above 175 F and full H2S, also with the skilled and experienced engineers, we can design the drill stem testing tools as per customer's well condition. Moreover, we supply the training in our factory and operation instruction at the well site. The DST tools are exported to USA, Colombia, India, Pakistan, Iran, Brazil etc. and enjoy the good reputation from the customers.

To shorten the delivery time, we proceeded the DST Tools in stock:

Packer,circualting valve,select tester valve,APR N-valve,OMNI valve,Hydraulic Jar,Tubing string tester

1. Full bore Packer, 7" Casing, working pressure 70Mpa, Working Temperature 400F, Connection: IF, 4set

2. Tester valve, 5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4 sets

3. Hydraulic Jar,5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4sets

4. Rupture disk Circulating valve, 5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4sets

5. Flowhead (surface test tree), 3 1/16", working pressure 70 Mpa. 1set

Should you have any interest or inquiry on the Drill stem testing tools, contact us freely.

skype Mr. Dongwa

Tel: 86-29-81779342
Fax: 86-29-81543379
Mobile: 136 5925 3658
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Company Info

XI'AN ZZ TOP OIL TOOLS CO.,LTD [China (Mainland)]

Business Type:Manufacturer, Distributor/Wholesaler, Service
City: Xi'an
Province/State: Shaanxi
Country/Region: China (Mainland)

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