Casing Pipe

Steel casing pipe is the structural string that holds the wellbore open and provides the barrier for cementing and zonal isolation-your casing choices directly affect collapse/burst margins and long-term well integrity.Octal Pipe supplies high-quality casing pipe manufactured in strict accordance with API 5CT and ISO 11960 standards, covering a full range of steel grades and connection types to meet global project requirements.

When selecting casing for a new well, the first questions every drilling or procurement engineer needs answered are simple but critical:

• Can this casing handle my well depth, pressure profile, and collapse load?
• Does the supplier provide stable grades (not over-stressed materials)?
• Are the threads reliable enough for my mud weight and torque program?
• Can they deliver the exact sizes and lengths needed for my running plan?
• Is there full traceability and quality control behind every joint?

Octal Pipe supplies API 5CT casing built around these real project needs-not just the API minimums.
Every joint we deliver has controlled chemistry, verified mechanical properties, PSL2-level inspection, and documented heat-treatment stability to ensure predictable collapse, burst, and tensile performance in the wellbore.

Want to see how these pipes are actually packed, loaded and shipped for real wells and pipelines?
👉 Please click "View OCTAL Project Shipments" to check real loading photos, sizes and destinations.

Octal Pipe supplies API 5CT latest edition (11th) certified casing that meets or exceeds the world's most recognized industry standards, ensuring seamless approval across operators, drilling contractors and regulators globally.

Key Notes for Selection

• J55 / K55 – cost-effective, most widely stocked for surface strings
• N80Q / L80-1 / C90 / T95 – mandatory restricted yield + stress-relieved for controlled sour service (NACE MR0175)
• L80-9Cr / 13Cr – martensitic stainless for severe CO₂ and chloride corrosion
• P110 / Q125 – highest strength for ultra-deep or high-collapse designs

Every grade can be supplied in PSL-1, PSL-2 or PSL-3, with full material test reports (EN 10204) and third-party inspection to match your exact well conditions.

Casing Pipe Price: What Usually Moves the Number

• Connection choice is the biggest swing: BTC vs premium is not a small add-on-make-up and seal strategy are what you're paying for.
• Sour-service requirements change the whole route: SSC/NACE-related requirements (when applicable) affect steel selection and QA scope.
• Inspection scope must be comparable: if one quote includes thread gauging / NDT / 3.2 and another doesn't, "price" is not comparable.

• Outside Diameter (OD): 4-1/2″ – 20″ (114.3 mm – 508 mm), covering virtually every standard casing size used worldwide.
• Wall Thickness & Weight: Full range per API 5CT tables – from lightweight 9.50 lb/ft up to heavy-wall 169.00 lb/ft, ensuring availability for shallow surface strings through ultra-deep, high-collapse production casing.
• Standard API Length Ranges: – Range 1 (R1): 16 – 25 ft (4.88 – 7.62 m) – typically used onshore when transportation length is restricted – Range 2 (R2): 25 – 34 ft (7.62 – 10.36 m) – popular for land rigs and shorter offshore lifts – Range 3 (R3): 34 – 48 ft (10.36 – 14.63 m) – our most heavily stocked length – preferred by major operators for offshore, deepwater and export projects (reduces connections by ≈30 % vs R2)
• Custom & Special Lengths: Exact cut-to-length up to 15 m (49.2 ft), pup joints, and crossover lengths produced to order with no extra cutting or waste charge on most common sizes (4-1/2″ to 13-3/8″).

OCTG casing for land drilling rigs

For conventional onshore oil & gas wells, our OCTG casing for land drilling rigs is supplied mainly in J55, K55, N80 and P110 with BTC/STC/LTC threads. Large stock in R2/R3 lengths and ready-to-run threading means you can build complete surface, intermediate and production strings with fewer mill changeovers and shorter rig waiting time.casing pipe oil and gas：

Surface casing: focuses on shallow formation support and cement job stability; buyer locks OD/grade/connection around rig handling and cementing plan.

Intermediate casing: chosen to isolate troublesome zones; buyer focuses on collapse/burst envelope and cementing reliability.

Production casing: becomes the long-term barrier; buyer focuses on connection sealing strategy and sour-service/SSC requirements (when applicable).

Steel casing pipe for offshore platforms and jack-up rigs

Offshore platforms and jack-up rigs demand higher safety margins. We supply heavy-wall P110/C110 and sour-service grades such as L80-13Cr and T95 with full NACE MR0175 testing and third-party witnessing. Controlled collapse resistance, premium connections and optional 3LPE/FBE coatings make these strings suitable for conductor and production casing in harsh marine environments.

API 5CT casing for directional and horizontal drilling

In directional and horizontal wells, casing must survive high doglegs, torque and multi-stage fracturing. Our API 5CT casing for directional and horizontal drilling uses high-strength grades with tight ovality and connection control, plus licensed special threads where needed. This reduces make-up problems, leakage risk and workover costs in shale and extended-reach wells.

Casing pipe for water wells and geothermal wells

For water wells and geothermal projects, our casing pipe for water wells and geothermal wells combines suitable carbon or alloy grades with controlled straightness and optional internal coatings. This helps maintain borehole stability, protects against corrosion and scaling, and gives your pumps and completion equipment a cleaner, longer-lasting casing string.

Casing While Drilling (CWD) String Requirements

• Connection priority shifts: CWD treats casing as a rotating string, so you lock connection type/make-up practice and reject criteria tighter than standard running.
• Wear & handling reality: state expected wear environment and handling method so the supplier can align end protection, thread protection, and packing discipline.
• Acceptance focus: require joint-level traceability and thread control evidence when specified, because CWD failures show up as make-up trouble and downtime, not as "pipe chemistry issues."

Octal Pipe provides a complete portfolio of API standard and premium connections to meet every well condition from shallow surface strings to ultra-deep HPHT and sour-service production casing:

• STC (Short Thread & Coupling) – economical, ideal for shallow/low-pressure surface casing.
• LTC (Long Thread & Coupling) – longer make-up length for improved tensile strength in intermediate strings.
• BTC (Buttress Thread & Coupling) – high axial load capacity, standard choice for deeper and deviated wells.
• NUE (Non-Upset External Upset Tubing Thread) – lightweight tubing connection, common in production strings.
• EUE (External Upset End Tubing Thread) – higher joint efficiency, widely used in oil/gas production tubing.
• Premium Gas-Tight Connections – metal-to-metal seal, 100 % leak-proof, validated to ISO 13679 CAL-IV. Perfect for sour service, high-pressure, and thermal recovery wells.

All connections are machined on our dedicated CNC lines, phosphated/copper-plated, supplied with original thread compound and heavy-duty protectors. Coupling stock and special clearance options available on request.

1. Ready Stock API 5CT Casing, Fast to Site
Over 15,000+ tons of API 5CT casing pipe kept in genuine stock from 4-1/2″ to 13-3/8″ in J55, N80Q, L80-1 and P110, mainly in R3 lengths. For standard OCTG casing sizes, 95 % of orders ship within 7–14 days, and urgent wells receive a firm quotation, PI and shipment schedule within 24–48 hours, so your rig programme is not waiting on pipe.For a recent example of stock-based casing supply and fast delivery, see our Aktobe Neftekhim 2025 Octal Pipe exhibition case

2. Sour-Service Casing Ready for H₂S / CO₂ Wells
For sour-service projects we supply L80-1, L80-13Cr, C90, T95, C110 sour service casing with hardness and mechanicals controlled for NACE MR0175 / ISO 15156. Each heat is hardness-tested, HIC/SSC tested and delivered with full test reports, helping your Middle East, North Sea and other H₂S fields pass owner and third-party audits the first time.

3. Licensed Premium Threads with Short Lead Times
With dedicated CNC lines in Tianjin and Shanghai, we machine API and special premium connections in-house on API 5CT casing pipe. Threads are gauged and physically validated to international performance standards, then finished with phosphating, copper plating and OEM thread compound. Typical delivery for threaded & coupled casing strings is 5–10 days after pipe readiness, reducing waiting time between mill and rig.

4. One-PO OCTG Package, Less Coordination for You
Instead of managing multiple vendors, you can place one purchase order for everything: casing, premium threading, pup joints, protectors, centralizers, SGS/BV/DNV inspection, ocean freight booking and customs documents. You receive rig-ready OCTG casing at the wellsite, with less internal coordination and lower risk of missing items or paperwork delays.

Octal Pipe uses advanced production lines and testing methods to ensure compliance with international standards. Processes include:

• Seamless hot rolling or ERW manufacturing
• Heat treatment (normalizing, quenching, tempering)
• Non-destructive testing (NDT): ultrasonic, electromagnetic, magnetic particle inspection
• Hydrostatic pressure test for each pipe
• Dimensional, straightness, and thread inspection
• Chemical and mechanical testing with certified reports

Exceptional Collapse Resistance Grades like N80Q, L80-1, C90, T95 and C110 use restricted yield strength ranges (e.g., 80–95 ksi for L80-1) and precise wall-thickness control. This design factors routinely exceed 1.2 even in 15,000 ft+ deep wells or high-external-pressure offshore environments, preventing ovalization and collapse long after cheaper unrestricted grades would fail.

Full Sour-Service Qualification (H₂S & CO₂) L80-1, L80-9Cr/13Cr, C90, T95 and C110 are manufactured and tested to the strictest NACE MR0175 / ISO 15156 requirements. Hardness is capped at 23–30 HRC, with every heat subjected to HIC and SSC tests (NACE TM0284 & TM0177 Method A ≥95 % acceptance). This makes them the trusted choice for Middle East sour giants, North Sea CO₂ floods, and North American shale plays with high H₂S.

Gas-Tight Premium Thread Performance Connections such as VAM TOP, NEW VAM, TENARIS BLUE, Hunting APEX and Hydril PH6 feature metal-to-metal seals, reverse-angle torque shoulders and resin-free dope options. They remain 100 % leak-proof after multiple make-and-breaks and under combined tension/compression/bending loads - validated to ISO 13679 CAL-IV or customer protocols.

High-Temperature & HPHT Reliability P110 and Q125 grades retain mechanical properties above 150 °C (300 °F) and 20,000 psi internal pressure, making them ideal for steam-assisted gravity drainage (SAGD), geothermal wells, and ultra-deep HPHT reservoirs without loss of yield or ductility.

Superior Geometry & Runability Cold-drawn finishing plus full-body normalizing or quench-and-temper ensure ovality below 0.5 % and straightness better than 1:2000. The result: dramatically lower running friction, easier centralization, and uniform cement sheath - reducing the risk of poor cement jobs and costly remedial work.

When you buy API 5CT casing, you're not only paying for steel – you're paying for how well it survives storage, sea transport and real well conditions. We can match surface protection to your project and logistics:

Black varnish / shop painting – basic anti-rust layer for yard storage and inland transport, suitable for fast-moving stock and standard land drilling projects.

3LPE or FBE external coating – for offshore conductors, CO₂ / water injection wells or highly corrosive soils, giving pipeline-grade corrosion protection on exposed casing strings.

Internal epoxy or cement lining – optional protection for water injection, disposal and CO₂ service, helping reduce internal corrosion, scaling and future workover frequency.

Plastic thread protectors and coupling covers – fitted on every joint to protect threads and seals during handling, stacking and sea freight; metal protectors available where rig handling is especially rough.

• You don't waste time guessing the spec

Tell us your well design and we help you lock the right API 5CT casing-grade, weight, connection and length-up front. With a full range from J55 to Q125, 4-1/2"–20" and both API & special connections, you're not forced into "almost correct" grades or mixing random leftovers from different suppliers.

• Fewer surprises with owners and inspectors

Each joint is drifted, hydrotested and NDT-checked, with heat numbers tracked from mill to finished casing string. We deliver complete test packs (MTC, NDT, hardness, sour-service tests where needed) in the format owners and third-party inspectors expect, so you spend less time arguing paperwork and more time running pipe.

• One source for both standard and difficult wells

Whether it's a simple land well or sour / HPHT / high-deviation well, we don't just push what's in stock. We recommend J55/K55/N80 for sweet wells, L80/T95/C110 for sour or high-pressure sections, and 13Cr or special grades where CO₂ and chlorides are high-so your string is built to the real downhole conditions, not to our warehouse inventory.

• Less trouble and wasted time on the rig floor

Casing comes with CNC-machined, API-gauged threads, correct dope, protectors and clear marking in running order. That means fewer rejected joints, fewer re-cuts and fewer unexpected make-and-break issues-your crew can pick up, make up and run the string with far less "rig drama".

• Delivery you can actually plan around

We prepare strings to your length range and running sequence, pack and mark them for fast yard handling, and ship through established routes to major oilfield regions. For urgent wells we can split shipments-critical sizes first, balance later-so your rig schedule is built around realistic dates, not best-case promises.

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Common Problem

How do I choose between J55, N80, L80 and P110?

You give us depth, pressure and basic fluid data, and Octal Pipe recommends a practical grade mix-J55/K55 for shallow, N80 for medium, L80/P110 for deeper or higher-pressure sections-so you don't overpay for steel you don't need.

Can you supply casing pipe for water wells and geothermal wells?

For casing pipe for water wells and geothermal wells, Octal Pipe uses suitable API 5CT or equivalent grades, with controlled straightness and optional internal coating, so your well stays stable and pumps run longer with fewer failures.

Can your casing be used in directional and horizontal wells?

Yes, we regularly supply api 5ct casing for directional and horizontal drilling, using high-strength grades and controlled connections to reduce make-up problems, leakage risk and unplanned fishing or workovers.

How fast can you deliver and what support do you provide?

For common sizes and grades, Octal Pipe can ship from stock in about 7–14 days, and for urgent wells we confirm availability and schedule within 24–48 hours, with threading, inspection and export packing arranged in one package.

Certifications

 

CE Certificate

ISO 9001 Certificate

API Q1 Certificate

ABS Certificate

AP-5L Certificate

API-5CT Certificate

 

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