Types Of Threads For Casing Pipe Threads are used as mechanical means to hold the neighboring joints together during axial tension or compression. For casing pipe, the most popular threading type is LTC (Long thread coupling), STC (Short thread coupling) and BTC (Buttress thread coupling). For all casing sizes, the threads are not intended to be leak-resistant when made up.In the design of those threading types, you can find them in API 5CT or API 5B. Long thread coupling LTC (Long thread) Long threads have obvious advantages that are widely used in casing pipe connections.For example, it is easy to process, good tightness, strong connection strength, simple maintenance, low price. The LTC thread is the same as the STC thread in the shape and can be connected, but it is generally not allowed to connect because the maximum torque they withstand is different.Casing pipe with long threads is the commonly used in the oil and gas industry. Short threading coupling STC (Short threading) STC coupling can withstand the strength of the tubular 60~80% of the pipe tensile, BTC coupling can hold more tensile but it’s sealing performance is poor under a circumstance like high internal pressure. Buttress threading coupling BTC (Buttress threading) This thread is designed to improve axial tensile or axial compressive load capacity and to provide leakage resistance.LTC, STC and BTC are the same in appearance, how to distinguish them depends on the outside diameter and application. What’s the use of LTC, STC and BTC? Connection strength and tightness are two main coupling technical indicators. Both LTC and STC couplings generally use lead, zinc, copper, graphite or silicone oil composition to improve seals, but those seals only work under a temperature of 60-95 Celsius. Also for STC coupling, if under huge external pressure and axial tensile stress, when heavy impact or bent happens, the threading will have more chance of slippage. Both of those two types of threading is not suitable for heavy oil thermal recovery, ultra-deep well and heavy corrosion environment. API standard threading coupling primarily seals the pipe by thread grease, metal plating and thread engagement of interface. STC thread root to tip clearance is 0.152mm, BTC threading gap is the whole height of the tooth. The bottom to tip is 0.178 for pipe under 193.7mm, and 0.229mm for pipe above 219.1mm https://lnkd.in/dYQRpy6s
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Assembling drill strings that operate reliably requires detailed calculations and comprehensive well designs. One of the major factors that determine the efficiency of a well is determining the kinds of oilfield pipe threads needed, their size, and what their strength should be for the different casings, tubes, and downhole equipment.
In fact, it’s not always possible to procure new Oil Country Tubular Goods (OCTG) for every well. This makes it important for producers to understand the compatibility and suitability of different types of threads and connections. The evolution of the oil and gas industry this past century led to a variety of manufacturing standards and thread types for different pieces of equipment.
Different Standards for Oilfield Pipe Thread Types
The American Petroleum Institute (API) provides a set of standards for threaded pipes and couplings. Specifically, API 5CT (currently in its 10th edition) lists the minimum requirements for designing and constructing wells for oil and gas operations.
The types of pipe threads specified by the API for casing and tubing include:
Short Thread Coupled (STC)
Long Thread Coupled (LTC)
Buttress Thread Coupled (BTC)
Line Pipe (LP)
External Upset End (EUE)
Non-Upset End (NUE)
While these provide the minimum design requirement for threaded connections, manufacturers also have their own variations called Premium Threads. These connections provide additional tensile capacity and improved hydraulic sealing, while also providing easier makeup of the string.
Learn more about how following API standards and specifications can boost your bottom line.
What are Premium Oilfield Pipe Threads?
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Premium oilfield pipe threads usually attempt to improve on the API standards. This can include modifying the thread form, crest-root design, torque shoulder, or integral flush. A premium thread may increase the cost of the OCTG, but with superior performance and reliability, it can increase both the lifespan of a well, as well as its overall yield. Operators and well designers need to consider the environment and geological profile of a site before determining what set of products will serve their needs.
Maintaining the Integrity of Oilfield Pipe Threads
Regardless of what type the designers select, the reliability of each connection will depend on the integrity of the thread. As corrosion, debris, and shock damage can lead to a compromised connection, ensuring all threads remain protected prior to installation remains important for a well’s efficiency.
Learn about the most important considerations for protecting pipe threads and OCTG integrity.
Oilfield thread protectors need to match the exact dimensions of the design criteria. MSI Pipe Protection Technologies provide pipe thread protectors for every kind of specification to help onshore and offshore operators. Even for producers who design and manufacture their own proprietary premium threads, MSI’s team can help with custom protectors.
MSI’s thread protection solutions include:
MAXX™
– Designed for API 5CT
MEGA™
– Plastic and Steel Composite Protectors
ULTRA™
– Premium Thread Protectors
Helping You Deliver a Variety of Protected Pipes and Equipment
MSI also has a range of protective products for equipment like perforating guns and sucker rods. Additionally, tubular handling systems, bumper rings, and pipe chocks can help ensure the integrity of all the OCTG used during operations.
To ensure the maximum protection of your oilfield pipe threads, MSI can assist with a solution. Our solutions are economical, reliable, and/or engineered in accordance with your exact specifications. As always, we’re committed to ensuring that we help you deliver protected pipes all day, every day. Connect with us today at 1-877-276-9208.
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