Casing and Casing Pup Joint

Suitable for conventional vertical wells, directional wells, horizontal wells, deep/ultra-deep wells, HTHP wells, sour gas wells and other complex well conditions, our casing and casing pup joint have been widely deployed in oil and gas fields worldwide, trusted by global drilling contractors, oilfield service companies and oil and gas operators.

The matching casing pup joints (short casing joints) are purpose-built for precise length adjustment of the casing string, perfectly compensating for length deviation of standard casing pipes, ensuring accurate setting depth of downhole tools, and significantly improving the efficiency and safety of casing running and cementing operations.

1.Full API 5CT Compliance & Global Compatibility : Fully manufactured and tested in line with the latest API Specification 5CT and ISO 11960 standards, with official API monogram license. Our products are fully compatible with all API-standard well completion equipment globally, meeting the procurement requirements of international oil and gas projects.
2.Superior Mechanical Performance for Harsh Downhole Environments : Available in a full range of API steel grades, with optimized design for tensile strength, collapse resistance, burst resistance and impact toughness. Our casing withstands extreme downhole conditions including high temperature, high pressure, H2S/CO2 corrosion, and complex formation stress, minimizing downhole failure risks and extending well service life.
3.Precision Machining & Zero-Leakage Thread Performance : Adopting high-precision CNC threading equipment, with 100% thread profile and tolerance inspection using API standard gauges. Precision-machined threads ensure perfect make-up, excellent sealing performance, and full interchangeability with same-specification casing from any mainstream manufacturer, eliminating cementing and production leakage risks, and reducing on-site non-productive time (NPT).
4.Flexible Length & Full Customization Options : Standard casing pipes are available in API R1, R2, R3 lengths. Our casing pup joints offer a wide range of standard lengths from 2ft to 12ft, with custom lengths from 0.3m to 6m fully accepted to meet your specific well design requirements. We also support custom end configurations, thread types, and anti-corrosion solutions to solve all your on-site length adjustment and special application challenges.
5.Complete Thread & End Connection Solutions : We provide all standard API casing thread types (STC, LTC, BTC) and various premium semi-premium and premium threads (VAM TOP, Hydril 511, TJ, etc.). Whether for conventional low-pressure wells or high-load deep wells, we deliver the most suitable connection solution to match your downhole load and sealing requirements.

Core Executive Standards
- Primary standard: API Specification 5CT (10th Edition) for Casing and Tubing
- Supplementary standards: ISO 11960, API Q1 Quality Management System, GOST, BS, and other regional standards available on request
Steel Grade Classification
- General Purpose Grades (H40, J55, K55): Cost-effective, stable performance for conventional shallow and medium-depth wells
- High Strength Grades (N80, P110, Q125, V150): High collapse and burst resistance for deep, ultra-deep wells and high-load downhole conditions
- Sour Service Grades (L80-1, C90, T95): Designed for H2S/CO2-containing sour environments, reduces corrosion failure risks
- Corrosion Resistant Alloy Grades (13Cr, Duplex Steel, Nickel-based Alloy): For extreme harsh conditions, superior high-temperature and corrosion resistance

We implement a full-process quality management system in accordance with API Q1 standards. Every piece of casing and pup joint undergoes rigorous inspection before delivery :

- Raw Material Inspection : Spectral analysis, mechanical property testing (tensile strength, yield strength, hardness), and non-destructive testing (NDT) of raw steel pipes, ensuring full compliance with API 5CT requirements.

- 100% Dimension Inspection : Full inspection of outer diameter, wall thickness, length, thread pitch, thread taper, and thread profile using high-precision measuring instruments, strictly controlling API tolerance compliance.

- Thread Integrity Inspection : Full thread verification with API standard working and master gauges, 100% visual inspection of thread surfaces, eliminating thread defects and ensuring perfect make-up performance.

- Non-Destructive Testing (NDT) : Full-body ultrasonic testing (UT), magnetic particle testing (MT) or electromagnetic testing (ET) to detect internal and surface defects, ensuring product structural integrity.

- Hydrostatic Pressure Test : Optional hydrostatic testing according to customer requirements, verifying burst resistance and sealing performance, ensuring zero leakage under rated pressure.

- Full Traceability Management : Each product has a unique identification code, with complete production and inspection records traceable throughout the entire process. Final pre-shipment inspection ensures zero defective products delivered.

- Oil & Gas Well Primary Cementing : For vertical wells, directional wells, horizontal wells, and extended reach wells, provides permanent wellbore reinforcement, isolates oil, gas and water formations, prevents formation collapse and fluid crossflow.
- Well Completion & Workover Operations : Used in completion string assembly, workover, and well stimulation projects. Casing pup joints enable precise length adjustment of the casing string, ensuring accurate setting depth of downhole tools, improving operation efficiency and safety.
- Complex Well Conditions : Suitable for deep/ultra-deep wells, high temperature and high pressure (HTHP) wells, sour gas wells, shale gas horizontal wells, and coalbed methane wells, delivering reliable performance in extreme downhole environments.
- Industrial Borehole Construction : Also applicable for deep water wells, geothermal wells, and mining engineering borehole reinforcement, providing long-term stable wellbore integrity.

Q: Are your casing and casing pup joint manufactured in accordance with API 5CT standard?

A: Yes. All our casing and casing pup joint are fully manufactured, inspected, and tested in strict accordance with the latest API Specification 5CT (10th Edition) and ISO 11960 standards. We hold an official API 5CT monogram license, and can provide a full set of inspection documents and material test reports (MTR) for every order.

Q: Can you provide custom length casing pup joints?

A: Absolutely. We offer standard casing pup joint lengths from 2ft to 12ft, and fully accept custom length requests from 0.3m to 6m to meet your specific well design and casing running requirements. We can also customize end configurations (PXP, PXB, BXB) according to your on-site needs.

Q: What steel grades are available for your casing products?

A: We provide a full range of API 5CT steel grades, including conventional grades (H40, J55, K55, N80), high strength grades (P110, Q125, V150), sour service grades (L80-1, C90, T95), and corrosion resistant alloy grades (13Cr, duplex steel, nickel-based alloy). Our technical team can recommend the most suitable steel grade based on your well conditions and formation parameters.

Q: Can your casing pup joints match with casing from other manufacturers?

A: Yes. Our casing pup joints are strictly manufactured to API 5CT thread tolerance standards, with 100% thread gauge inspection. This ensures 100% interchangeability and perfect make-up with same-specification API standard casing from any mainstream manufacturer worldwide, with no compatibility issues.

Q: What is your minimum order quantity (MOQ)?

A: For in-stock standard specifications, our MOQ is 1 ton (trial orders are accepted) to support your small-batch procurement and project testing. For bulk custom production, the MOQ is negotiable based on specific specifications and order quantity.

Q: What thread types do you offer for casing and pup joints?

A: We provide all standard API casing thread types, including STC (Short Round Thread Casing), LTC (Long Round Thread Casing), BTC (Buttress Thread Casing). We also offer various premium threads such as VAM TOP, Hydril 511, TJ, etc., to meet the requirements of high pressure, high load, and special well conditions.

Q: What quality inspection documents can you provide?

A: We provide a full set of official inspection documents for each order, including Material Test Report (MTR) with chemical composition and mechanical properties, Dimension Inspection Report, Thread Inspection Report, Non-Destructive Testing (NDT) Report, Hydrostatic Pressure Test Report, and API 5CT Certificate of Conformity (COC). Third-party inspection (such as BV, SGS, DNV) is also accepted according to customer requirements.

Q: What is your delivery lead time?

A: For standard specifications with sufficient stock, we can arrange delivery within 7-15 days after receiving your advance payment. For custom production orders, the lead time is 20-45 days, depending on order quantity, specifications, and production schedule. We will keep you updated on production progress throughout the entire order process.

Q: Can you provide anti-corrosion coating for the casing?

A: Yes. We offer various anti-corrosion coating options to extend casing service life in harsh downhole environments, including Fusion Bonded Epoxy (FBE) coating, 3PE/2PE coating, liquid epoxy coating, anti-rust oil, and black varnish. We can also provide custom coating solutions according to your specific corrosion protection requirements.

Q: What payment terms do you accept?

A: We accept flexible payment terms to support your business. For regular orders, we accept 30% T/T advance payment, 70% balance against the copy of the bill of lading. Irrevocable L/C at sight is also accepted for bulk orders. For long-term cooperative partners, we can negotiate more favorable payment terms.

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