API 11B sucker rod

API 11B sucker rod is a core mechanical component specially designed for onshore and offshore oil and gas field pumping systems, strictly manufactured in accordance with the latest API Spec 11B international industry standards. As a key connecting part between the surface pumping unit and downhole oil well pump, it undertakes the critical task of transmitting reciprocating power to realize continuous crude oil extraction, and is widely applicable to conventional oil wells, low-permeability oil wells, heavy oil wells and various medium-depth oil and gas production scenarios.

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Product Encyclopedia

1. Product Description

API 11B Sucker Rod is a core mechanical component specially designed for onshore and offshore oil and gas field pumping systems, strictly manufactured in accordance with the latest API Spec 11B international industry standards. As a key connecting part between the surface pumping unit and downhole Oil Well Pump, it undertakes the critical task of transmitting reciprocating power to realize continuous crude oil extraction, and is widely applicable to conventional oil wells, low-permeability oil wells, heavy oil wells and various medium-depth oil and gas production scenarios. Made of high-quality micro-alloyed carbon steel and alloy steel through precision hot rolling, overall quenching and tempering, and shot blasting treatment, the product features uniform internal structure, high structural density and excellent comprehensive mechanical properties. The standard 9° box cone thread design effectively optimizes connection tightness, avoids thread slipping and oil leakage, and ensures stable power transmission under long-term reciprocating operation, high tension and downhole complex working conditions. Compared with ordinary sucker rods, API 11B certified products have outstanding advantages in fatigue resistance, corrosion resistance and tensile strength, which can effectively adapt to downhole high pressure, humid and corrosive environments, reduce equipment failure rate and extend the service life of the pumping system. All products undergo strict online fault detection and mechanical performance testing during production to ensure full compliance with API dimensional tolerance, thread forming and quality control specifications, providing reliable and long-lasting power support for oilfield continuous production.

2. Product Specification & Model Parameter Table

API 11B sucker rods cover multiple standard sizes and performance grades, covering mainstream application demands of global oilfields. The core specifications and mechanical parameters are standardized as follows, with all indicators fully complying with API 11B 28th edition specifications:

Size (Inch)	Nominal Diameter (mm)	Standard Length (m)	Performance Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Core Features
5/8	15.88	7.62	C/D/KD	620-795	≥485	≥12	Lightweight, suitable for shallow wells
3/4	19.05	7.62	C/D/KD/HL	690-860	≥550	≥11	Universal type for medium-shallow wells
7/8	22.23	7.62	D/KD/HY	795-965	≥590	≥10	High strength, fatigue resistant
1	25.40	7.62	D/KD/HY	860-1030	≥650	≥9	Heavy-duty for medium-deep wells
1 1/8	28.58	7.62	KD/HY	900-1100	≥700	≥8	Ultra-high strength for deep wells

All models support customized length and special anti-corrosion coating processing. The matching couplings adopt 8630 high-strength steel, with standard API 11B thread profile, ensuring precise docking and stable connection. The product adopts wooden case packaging in line with API Standards to avoid damage during long-distance transportation.

3. Company Introduction

Our company is a professional integrated manufacturer and supplier of oilfield downhole equipment integrating R&D, production, inspection and sales, with more than 20 years of professional experience in oilfield sucker rod production. The factory covers a large-scale production base, equipped with advanced full-automatic rolling production lines, integral quenching and tempering heat treatment equipment, and precision thread processing and testing instruments. We strictly implement API 11B international standards and ISO quality management system in the whole production process, from raw material procurement, precision processing, heat treatment to finished product inspection, realizing full-process quality traceability. The company focuses on technological innovation, continuously optimizing product formulas and production processes, and has independently developed high-fatigue and anti-corrosion series sucker rod products, which solve the pain points of easy fracture and short service life of traditional products in harsh working conditions. All products have obtained API monogram certification and international quality inspection certificates, and are widely exported to more than 30 countries and regions such as Southeast Asia, the Middle East, Africa and South America. Adhering to the business philosophy of "Quality First, Customer Supreme", we provide one-stop services including product customization, technical guidance, after-sales maintenance and global logistics distribution for oilfield enterprises at home and abroad, and have established long-term stable cooperative relations with many large petroleum groups, winning high recognition and trust from customers.

4. Frequently Asked Questions (FAQ)

Q1: What is the core standard of API 11B sucker rod?A1: All products are manufactured in strict accordance with the 28th edition of API Spec 11B, covering dimensional accuracy, thread form, mechanical properties, surface treatment and quality testing standards, with API monogram certification to ensure universal compatibility with global oilfield equipment.

Q2: What working conditions are suitable for different grades of sucker rods?A2: Grade C is suitable for conventional shallow and medium wells with stable working conditions; Grade D is universal for most medium-depth oil wells with good fatigue resistance; KD and HY high-strength grades are specially used for deep wells, heavy oil wells and high-frequency reciprocating working conditions with severe load changes.

Q3: How to ensure the connection stability of the sucker rod?A3: The product adopts standard 9° box cone thread design, with precise thread matching. Equipped with supporting 8630 high-strength couplings, it effectively improves connection tightness and tensile resistance, avoiding loosening and fracture during long-term operation.

Q4: What is the product warranty and after-sales service?A4: We provide a 1-year official warranty for all API 11B sucker rods. Any quality problems caused by production processes during the warranty period can be replaced free of charge. We also provide 24-hour online technical support and on-site guidance services.

Q5: Can customized products be provided?A5: Yes. We support customized services of special lengths, high anti-corrosion coatings, ultra-high strength specifications and special thread models according to customers' well condition and production demands, meeting personalized application needs of different oilfields.

API 11B Sucker Rod is a standardized and specialized downhole power transmission component in the petroleum extraction industry, and the core execution standard is the API Spec 11B specification formulated and updated by the American Petroleum Institute, which is the unified international technical standard for global sucker rod design, manufacturing and inspection. As an indispensable part of the rod pumping system, the sucker rod string composed of multiple single sucker rods and couplings connects the surface pumping unit and downhole plunger pump, converts the rotary motion of the surface unit into downhole reciprocating linear motion, and realizes the lifting and extraction of underground crude oil, which is the core power transmission carrier of conventional mechanical oil production technology.

In terms of product classification, API 11B sucker rods are scientifically graded according to material composition, mechanical properties and applicable working conditions, mainly including C, D, K, KD, HL, HY and other mainstream grades. Grade C is a conventional carbon steel sucker rod with stable performance and cost-effective, suitable for conventional oil wells with low load and stable working environment; Grade D is modified alloy steel material, with significantly improved fatigue resistance and tensile strength, which is the most widely used general-purpose grade in medium-depth oil fields; KD and HY high-strength series adopt micro-alloyed refined steel, through integral quenching and high-temperature tempering process, with ultra-high tensile strength and fatigue resistance, which can adapt to harsh working conditions such as deep wells, ultra-deep wells, heavy oil wells and high water-cut oil wells, and effectively resist fatigue fracture and stress corrosion caused by long-term high-frequency reciprocating load.

In terms of structural design, the standard API 11B sucker rod consists of three parts: rod body, upset forging end and thread joint. The rod body adopts a smooth cylindrical structure with uniform wall thickness to reduce downhole fluid resistance and friction loss; the two ends are integrally upset and thickened to enhance the structural strength of the stress concentration area and avoid end fracture; the thread adopts a special 9° tapered box cone thread profile, with accurate tooth shape and uniform pitch, which has excellent self-locking performance and sealing performance. This structural design can effectively disperse working stress, reduce thread wear and loosening probability, and ensure the stability and safety of the rod string under long-term alternating load. The standard single rod length is 7.62 meters (25 feet), and multiple rods can be connected through standard couplings to form a rod string matching different well depths, with strong assembly flexibility and equipment compatibility.

In terms of production process and quality control, qualified API 11B sucker rods need to go through strict production processes including raw material inspection, hot rolling forming, integral upsetting, overall quenching and tempering heat treatment, thread precision machining, surface shot blasting and anti-corrosion treatment. The heat treatment process is the core link to determine product performance. Overall quenching improves the hardness and strength of the rod body, and high-temperature tempering eliminates internal stress, ensuring the product has both high strength and good toughness. All finished products must pass tensile test, fatigue test, dimensional tolerance detection and thread precision inspection to ensure that all mechanical indicators and dimensional parameters fully meet API 11B standard requirements. The surface shot blasting treatment removes oxide scale and burrs, improving the adhesion of anti-corrosion coatings and the wear resistance of the product.

In terms of industry application and technical value, API 11B sucker rod has the characteristics of wide adaptability, stable performance and long service life, and is applicable to almost all conventional mechanical oil production scenarios. Its standardized design realizes the universal interchangeability of global oilfield equipment, greatly reducing the procurement and maintenance costs of oilfield enterprises. With the continuous development of oilfield exploitation technology, high-strength, anti-corrosion and fatigue-resistant API 11B upgraded sucker rods have become the mainstream of the market, effectively solving the technical problems of short service life and frequent replacement of traditional sucker rods in harsh working conditions, improving the continuous operation efficiency of oilfield production systems, and reducing production and operation costs. As the most basic and core component of rod pumping oil production technology, API 11B sucker rod plays an irreplaceable role in ensuring stable and efficient production of onshore and offshore oil and gas fields, and is an essential basic equipment for the sustainable development of the petroleum extraction industry.

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API 11B sucker rod

API 11B sucker rod

1. Product Description

2. Product Specification & Model Parameter Table

3. Company Introduction

4. Frequently Asked Questions (FAQ)

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