Drill Bits & Tools

Technical Specifications – Drill Bits & Downhole Tools

The following tables provide key specifications for our primary product categories. Detailed technical data sheets available on request.

PDC Bits

Parameter	Specification
Bit sizes	3‑¾″ to 26″ (95.3 mm to 660.4 mm)
Body types	Matrix body (abrasive formations) / Steel body (impact‑prone formations)
Blade count	3 to 9 blades
Cutter type	High‑performance PDC cutters, various grades available
IADC coding	M (matrix) / S (steel) plus cutter size code (e.g., S616, M616)
Hydraulic design	Optimized nozzle placement and flow simulation
Cutting structure	Force‑balanced, asymmetrical blade design
API connection	API Reg pin (sizes from 2‑⅜″ Reg to 7‑⅝″ Reg)
API standard	API 7‑1
Customization	Any size, blade count, cutter grade available

Roller Cone Bits

Parameter	Specification
Bit sizes	4‑¾″ to 26″ (custom sizes available)
Tooth types	Milled tooth (steel tooth) / Tungsten carbide insert (TCI)
IADC range	1xx through 8xx (soft to extremely hard formations)
IADC 1xx	Very soft formations – clay, mudstone, chalk, soft limestone
IADC 4xx	Soft to medium formations – shale, sandstone, medium limestone
IADC 6xx	Hard formations – hard limestone, dolomite, abrasive sandstone
IADC 8xx	Extremely hard / interbedded formations
Bearing types	Rubber‑sealed / Metal‑sealed (up to 250°C)
API connection	API Reg pin (4‑½″ Reg through 7‑⅝″ Reg)
Standard	API Spec 7‑1

Positive Displacement Motors (PDM / Mud Motors)

Parameter	Specification
Size (OD)	43 mm – 286 mm (1.7″ – 11.25″) and larger
Hole size compatibility	3‑½″ through 17‑½″ wellbores
Lobe configurations	1:2, 3:4, 5:6, 7:8, 9:10
Bent housing options	Straight / Single‑bent (0–1.5°) / Double‑bent / Adjustable (0–3°)
Stator temperature rating	Standard 150°C / High‑temp 175°C
Special formulations	Oil‑based mud resistant / Saturated saltwater mud resistant
Long‑type motors	30–60% higher torque than standard
API standard	API Spec 7‑1

Application Fields – Matching Tools to Formations

Different formations and well types demand different tool combinations. Here is how our classification applies to common applications:

🏗️ Vertical Wells (Conventional)

• Tools used: PDC or roller cone bit + drill collars + jar (optional) + stabilizer

• Bit selection: PDC bits for soft to medium formations; TCI roller cone bits for hard, abrasive sections

📐 Directional and Build‑Section Wells

• Tools used: PDC bit + mud motor (bent housing) + MWD + non‑magnetic drill collar + stabilizer + jar

• Motor selection: Shorter motors with adjustable bent housing (0–3°) for precise build rates

• Bit selection: PDC bits with shallower cone profiles for better steerability

📏 Horizontal and Extended‑Reach Wells

• Tools used: Same as directional, plus longer motors for extended lateral capability

• Motor selection: High‑torque (7:8 or 9:10 lobe) long‑type motors; torque increased 30–60% over standard

• Bit selection: PDC bits with optimized cutter exposure for consistent ROP through lateral

⛽ Hard and Abrasive Formations

• Tools used: TCI roller cone bit (IADC 6xx or 8xx) + shock sub + jar

• Bit selection: Metal‑sealed bearing bits for high‑temperature, high‑RPM applications; carbide inserts designed for abrasive wear resistance

🧪 Deep and Ultra‑Deep Wells (High Temperature / High Pressure)

• Tools used: High‑temperature PDC bits (special cutter grades) + high‑temp elastomer mud motor (175°C) + high‑temp jars

• All seals and elastomers rated for extreme downhole heat

• Case study: Kingdream bits and downhole tools set a record of 5,818 meters in the Tarim Basin, Xinjiang, demonstrating capability in ultra‑deep, high‑pressure environments. This success has led to over 30 drilling records being broken since the launch of our four‑blade combination.

🌍 International Oilfields – Proven Performance

• Kuwait Oil Company (KOC): After securing a long‑term drill bit service contract in 2022, Kingdream’s large‑size hybrid bits, shaped‑cutter PDC bits, and RSS PDC bits have been widely applied in Kuwait. A product and technology promotion conference was successfully held there in 2024.

• Kazakhstan: Our "Peak” series PDC bits achieved 2,252 meters of penetration in a single bit run – 50.13% higher than the block average.

• Russia: Our SJPETRO, KINGDREAM, and SJS brands are well‑recognized by Russian customers.

Why Choose SJ Petro / Kingdream for Drill Bits & Downhole Tools?

🏭 Over 40 Years of Downhole Tool Expertise

Kingdream has been dedicated to drill bits and downhole tools for over four decades. We are not a new entrant to the market. Our "KINGDREAM” trademark has been recognized as a China Famous Trademark, and we have received numerous honors, including "World Market China (Petroleum Machinery) Top Ten Annual Brands” and "China Petroleum and Petrochemical Equipment Manufacturing Industry Outstanding Contribution Award”.

👑 One of the World’s Major Downhole Tool Manufacturers

Kingdream competes directly with global leaders such as Baker Hughes, Schlumberger, and Halliburton. Our product range covers:

• Drill bits (PDC, roller cone, hybrid) – all IADC classifications, all bit sizes

• Downhole drilling motors – all sizes, lobe configurations, and bent housing types

• Downhole tools – jars, stabilizers, NMDCs, fishing tools, shock subs

• Drilling accessories – crossovers, subs, and drill stem components

🔧 Full API Certification – Quality You Can Trust

Our products are manufactured to API 7‑1 and 7‑2 specifications. We hold API Q1, API 7, API 4F, API 6A, and API 16C certifications across our manufacturing facilities. Third‑party inspection (DNV, BV, ABS) is welcome at any stage of production.

🌍 Global Export Track Record – Recognition in Major Oilfields

Kingdream products are currently operating in:

• Kuwait – Hybrid bits, shaped‑cutter PDC bits, RSS PDC bits

• Kazakhstan – Record‑setting PDC bit performance (2,252 meters in one run)

• Russia – KINGDREAM, SJPETRO, and SJS brands recognized by Russian customers

• China – Tarim Basin record of 5,818 meters

🔄 Complete Downhole Tool Ecosystem – One‑Stop Supply

You source everything from one manufacturer, with consistent quality, matched component compatibility, and a single point of contact.

🧪 Continuous Innovation – Hybrid Bit Technology

We pioneered China’s "fixed blade + rolling cone” hybrid rock‑fracture theory, developing four functional "Long” series hybrid bits covering 5‑½″ to 26″ sizes. This proprietary technology gives Kingdream a unique competitive advantage in hard and interbedded formations.

🎯 Custom Engineering Services

We do not just sell off‑the‑shelf tools. Our engineering team can customize:

• Bit cutter layout for your specific formation

• Motor lobe configuration for your flow rate and torque requirements

• Bent housing angle for your build rate target

• Non‑standard tool dimensions for specialized applications

Frequently Asked Questions (FAQ)

Q1: What is the difference between PDC bits and roller cone bits?

A: PDC bits use synthetic diamond cutters and drill by shearing the rock. They are generally faster in soft to medium‑hard, non‑abrasive formations but can be damaged in hard, interbedded, or highly abrasive rocks. Roller cone bits (milled tooth or TCI) use rotating cones with teeth or inserts that drill by crushing and gouging. They are more durable in hard, abrasive formations and interbedded sequences. We manufacture both, as well as hybrid bits that combine both cutting mechanisms.

Q2: What do IADC codes mean for roller cone bits?

A: The IADC (International Association of Drilling Contractors) code tells you the bit’s formation application:

• 1st digit (series): Formation hardness – 1 (soft) through 8 (extremely hard)

• 2nd digit (type): Cutting structure – 1 (milled tooth) / 2–4 (TCI, medium to hard) / 5–7 (TCI, hard)

• 3rd digit (bearing/seal): 1 (standard roller bearing) / 2 (air-cooled) / 3 (roller bearing, sealed) / 4–7 (journal bearing, sealed)

• 4th digit (gauge protection): 1 (standard) / 2–3 (hardfaced) / 4–5 (TCI gauge)

For example, IADC 447 indicates: Series 4 (medium formation), TCI cutting structure, sealed journal bearing.

Q3: What is the benefit of high‑torque mud motors for horizontal drilling?

A: Horizontal sections generate high friction against the wellbore, requiring more torque to rotate the bit and drill string. Our long‑type mud motors increase torque by 30–60% compared to standard motors, allowing you to drill longer laterals without stalling the motor or reducing ROP. High‑torque motors (7:8 or 9:10 lobe configurations) are specifically designed for PDC bits in extended‑reach applications.

Q4: How do I choose the right bit for my formation?

A: This is a detailed engineering decision based on your specific lithology, but general guidelines are:

• Soft formations (clay, shale, chalk, salt): PDC bits or IADC 1xx/4xx roller cone

• Medium formations (sandstone, limestone): PDC bits (non‑abrasive) or IADC 4xx/5xx/6xx roller cone

• Hard, abrasive formations (dolomite, hard sandstone, granite): TCI roller cone (IADC 6xx/8xx) or hybrid bits

• Interbedded or hard stringers: Hybrid bits (fixed blades + rolling cones)

We provide a bit selection guide and can recommend the optimal bit based on your offset well data.

Q5: What does "force‑balanced cutting structure” mean on your PDC bits?

A: A force‑balanced cutting structure means the side forces acting on the bit are canceled out, resulting in the bit rotating around its center rather than wobbling. This reduces vibration, improves directional control, prevents bit whirl, and extends cutter life. Our asymmetrical blade design achieves this without sacrificing ROP.

Q6: Can you customize downhole tools for my specific well conditions?

A: Yes. We offer full customization services:

• Bits: Custom IADC codes, cutter grades, blade counts, hydraulic designs, and nozzle configurations

• Motors: Custom lobe configurations, bent housing angles (0–3°), stator elastomer grades, and length modifications

• Downhole tools: Custom lengths, thread types, and material specifications

• Fishing tools: Custom‑designed overshots and spears for non‑standard fish shapes

Q7: What is the typical lead time for drill bits and downhole tools?

A: Lead times vary by product and customization level:

• Standard PDC bits (stock sizes): 4–6 weeks

• Custom PDC bits: 6–8 weeks

• Roller cone bits (standard IADC codes): 4–6 weeks

• Custom roller cone bits: 6–8 weeks

• Mud motors: 6–8 weeks for standard lobe configurations

• Drilling jars, stabilizers, NMDCs: 6–8 weeks

• Fishing tools: 4–6 weeks (stock items available)

Q8: What after‑sales support do you provide for drill bits and downhole tools?

A: Our standard support package includes:

• Bit run analysis – Post‑run evaluation of bit wear patterns, ROP, and drilling parameters; recommendations for next‑bit optimization

• Tool maintenance guides – Inspection procedures, repair thresholds, and component replacement schedules

• Spare parts supply – Replacement cutters (for repairable PDC bits), seals, bearings, stators, and rotor components

• Technical hotline – 24/5 (Monday–Friday) support for run planning and troubleshooting