What Are SLIPS in Oil and Gas Drilling and How Do You Choose the Right Type?

SLIPS are the tools that grip and suspend drill pipe in the rotary table, and you choose the right type mainly by matching gripping length to drilling depth and confirming the pipe outside diameter (OD) range. In the product range shown on srlf.net, rotary slips accommodate drill pipe from 2 3/8–7 in (60.3–177.8 mm) OD and are classified as Ultra-Short (SDS-S), Short (SDS), Medium (SDML), and Extra Long (SDXL) according to gripping length. Use the shortest class that safely covers your drilling depth for shallow work, step up to medium for general drilling, and reserve the extra-long class for deep drilling.

What SLIPS Do in the Rotary Table

A slip is a wedge-shaped gripping tool that sits in the rotary table opening and holds the drill string so it can be suspended while connections are made or broken. The gripping surface (dies or inserts) bites into the pipe OD, and the tapered body transfers the load into the rotary table bushing. This is why slip selection is a load-and-size decision as much as a handling decision.

Gripping-Length Classes and Where They Fit

The site classifies rotary slips by gripping length, and ties each class to a drilling depth band:

The logic behind the classes: a longer gripping length spreads the load over more pipe surface, which matters as string weight and depth increase. A shorter slip is quicker to handle and suits lighter, shallower strings. The trade-off is that going longer than needed adds handling effort without a depth benefit.

How to Match Slips to Pipe and Depth

1. Confirm the pipe OD. Rotary slips in this range cover 2 3/8–7 in (60.3–177.8 mm) OD. If your pipe falls outside that window, this slip family is not the match.
2. Identify the drilling depth band. Shallow → SDS-S or SDS. Medium → SDML, described as the perfect choice for all medium-depth drilling. Deep → SDXL.
3. Check the load path. The slip works together with the rotary table bushing, so the bushing and slip tapers must be compatible.
4. Inspect dies and inserts before use. The gripping elements are what actually contact the pipe; worn or wrong-profile inserts change how the load is carried.

Rotary Slips vs. Spiders and Slip-Type Elevators

These are related but not interchangeable:

• Rotary slips seat in the rotary table and suspend the string there.
• Spiders are the counterpart used in the table opening for handling, and the site lists them as a separate product category alongside slips.
• Slip-type elevators/spiders are mechanized, air-operated tools that can handle casings up to 20 in. They are described as easy to operate, dependable, and able to reduce workload, and are designed and manufactured according to API & ISO.

If your task is suspending drill pipe in the rotary table, you want slips. If you are handling casing up to 20 in with mechanized operation, the slip-type elevator/spider is the relevant tool.

Compliance and Pre-Use Checks

The slip-type elevators/spiders are stated to be designed and manufactured according to API & ISO. For any slip, verify the standard and certification your operation requires, then inspect the gripping elements (dies/inserts) and the slip body before each use. The site does not publish a specific inspection interval or torque/load table for slips, so confirm those against your own operating procedure and the manufacturer's documentation.

Practical Selection Summary

• Pipe OD 2 3/8–7 in (60.3–177.8 mm) → rotary slips in this range.
• Shallow drilling → SDS-S or SDS.
• Medium-depth drilling → SDML.
• Deep drilling → SDXL.
• Casing up to 20 in with mechanized handling → slip-type elevator/spider (API & ISO).
• Always confirm bushing compatibility and inspect dies/inserts before use.

For current pricing and availability, contact the supplier directly; the site lists a 24-hour service hotline at 008613862776577 and an email at [email protected].