At present, there are four major series of premium thread designed and developed in various countries in the world: VM series, Hydrir series, Hunting series and Tenaris series.

Features of prtemium thread

Although the design of premium thread for casing varies from country to country and company to company, the basic form is basically the same, mainly to improve the connection strength and sealing performance of the pipe string.

On the other hand, most oil casing premium thread are divided into three parts: the connection thread part, the shoulder of the anti-torque table and the sealing surface part.

Most use API trapezoidal threads to improve the interchangeability of threaded parts.

Advantages of premium thread:

In the early stage of the use of oil well pipes, premium thread were designed for different oil fields, different blocks, and different well conditions, with a strong personalized color. However, as well conditions become more complex, the conditions under which the pipeline is used become more stringent. After the comparison, screening and actual test of various special buckles in foreign countries, more than 10 typical products are gradually formed, which can basically meet the special needs of the current oil field. Although various special buckle products can meet the needs of drilling and production under different simultaneous conditions, they all have the following common advantages:

1. The connection strength of the joint can be matched with the strength of the pipe body, and even the strength of the joint higher than the pipe body is suitable for deep and ultra-deep wells;

2. Good sealing performance, suitable for high pressure gas wells, oil wells and thermal recovery wells

3. Strong bending resistance, suitable for supporting wells, large displacement wells and horizontal wells;

4. It is easy to fix, can be fastened quickly, and it is not easy to perform drilling operations in harsh environments such as deserts and oceans;

5. Good anti-adhesion performance, can be removed repeatedly without damaging the threads;

6. Strong anti-torque capability;

7. Good corrosion resistance.