What is Stage Mechanical Stage Collar?
The Stage Mechanical Stage Collar is the traditional design of stage collar in well cementing process, relying on physical, gravity-driven tools to activate the cementing ports. The Stage Mechanical Stage Collar is a high-quality, robust tool engineered for maximum downhole performance, allows cementing to be split into two stages. It is built from materials with a minimum yield strength of up to 135,000 psi, including grades suitable for sour gas environments.
Appilcation of Stage Mechanical Stage Collar
The Mechanical Stage Collar is chosen when the wellbore trajectory allows for gravity to assist the operation, providing a highly reliable and lower-cost solution.
- Vertical & Shallow-to-Medium Depth Wells: When the well is relatively straight, the simple mechanical activation is robust and highly dependable.
- Cost Efficiency: For wells where rig time is a factor but not excessively expensive, the lower purchase cost of the mechanical tool makes it preferable.
- Simple Zonal Isolation: Used effectively for segmenting the cement job to protect a single, clearly defined weak formation zone in a vertical section.
data sheet of Stage Mechanical Stage Collar
| Size (mm) / (in) | OD (mm) | ID (mm) | Length (mm) | Opening Pressure (Mpa) | Closing Pressure (Mpa) | Threads Load (T) | Thread Type | Part No. | |
|---|---|---|---|---|---|---|---|---|---|
| 140 | 5-1/2 | 168 | 121 | 1180 | 7-9 | 5-6 | 120 | API / Premium Thread | SCJX140 |
| 168 | 6-5/8 | 200 | 150 | 1240 | 7-9 | 5-6 | 170 | API / Premium Thread | SCJX168 |
| 178 | 7 | 208 | 156 | 1200 | 7-9 | 5-6 | 210 | API / Premium Thread | SCJX178 |
| 244 | 9-5/8 | 285 | 220.5 | 1300 | 7-9 | 5-6 | 350 | API / Premium Thread | SCJX244 |
| 340 | 13-3/8 | 385 | 320 | 1320 | 7-9 | 5-6 | 540 | API / Premium Thread | SCJX340 |
Mechanical Stage Collar V.S. Hydraulic Stage Collar
| Feature | Stage Mechanical Stage Collar (MC) | Stage Hydraulic Stage Collar (HC) |
|---|---|---|
| Opening Mechanism | Activated by a gravity-fed, free-fall opening plug/dart that lands on a seat. | Activated by a pumped hydraulic ball or special plug that lands on a seat. |
| Primary Force | Gravity is critical for the dart/plug descent. | Hydraulic Pumping Pressure is the sole driver. |
| Structure | The internal seat and sleeve are designed to interface with the larger, heavier mechanical dart. | The internal seat (ball seat) is designed to securely seal around a high-pressure ball or plug. |
| Well Suitability | Vertical / Low-Deviation Wells (Ideal ≤ 30° deviation). | High-Angle / Horizontal Wells (Required for ≥ 45° deviation). |
| Operational Risk | Risk of the opening dart/plug sticking or failing to land in a high-angle section. | Risk of the hydraulic ball/plug failing to seal properly under pressure or being pumped out prematurely. |
| Drill-Out Time | Generally takes slightly longer to drill out if the dart/plug is heavier or more metallic. | Often designed for faster drill-out with smaller, engineered components. |
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Stage Mechanical Stage Collar
why choose puyang zhongshi co ltd?
Premier Authority and Most Capable Supplier in Oilfield
Established in 1996 through the SINOPEC Central Plains Oilfield restructure, Puyang Zhongshi Group Co Ltd operates with a registered capital of 130 million RMB and an annual output of 200 million RMB. We employ over 580 staff, including 160+ technical experts.
Our main product is Oil Machinery, supported by over 10 specialized companies (including cementing tools, pumping units, and wellhead systems) and five international trade departments. For cementing tools, we have a robust monthly capacity of 500 sets of float equipment and 30,000 centralizers.
We have built long-term strategic partnerships across major global markets, including USA, Russia, Kazakhstan, Sudan, Indonesia, Iran, and Venezuela.
fully certified by API & ISO
The API (American Petroleum Institute) certifications our company Puyang Zhongshi Group holds are excellent and position us very strongly in the global oil and gas market. They provide an authoritative, third-party validation of our product quality and system reliability.
Having the API Q1 certification immediately places our company Puyang zhongshi group co ltd in the top tier of suppliers. Many smaller manufacturers only hold ISO 9001, but the Q1 certification signals a commitment to the oil and gas industry’s most demanding quality requirements, especially relevant for services and complex equipment.
Supplier of the SLB, Halliburton & Baker Hughes
We are the stable supplier of the International Big Three—Schlumberger, Halliburton, and Baker Hughes. Our established partnership with these global leaders means our products and services are proven to meet the industry’s most rigorous standards. Our clients include many top oil service companies in the world.
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