Downhole tool specifications
Downhole Tool Specifications Overview
Downhole tools are engineered to specific international standards, primarily API Spec 7‑2 (rotary shouldered connections) and API Spec 7‑1 (rotary drill stem elements). Understanding these specifications is essential for proper tool selection and BHA design.
| Specification Category | Key Parameters | Relevant Standard |
|---|---|---|
| Drill bit specifications | Diameter, IADC code, connection thread, recommended WOB/RPM | API Spec 7‑2 |
| Downhole motor specifications | Outer diameter, torque output, flow range, differential pressure, temperature rating | API Spec 7‑1 |
| BHA component specifications | Drill collar OD/ID, stabilizer dimensions, material grade, hardness | API Spec 7‑1 |
| Connection specifications | Thread type (REG/IF/FH), size, make‑up torque, inspection requirements | API Spec 7‑2 |
API Spec 7‑2 — The Standard for Rotary Shouldered Connections
All Kingdream downhole tools are designed, manufactured and tested to API Spec 7‑2 (Specification for Threading and Gauging of Rotary Shouldered Connections), the industry standard for drill‑string components. API Spec 7‑2 specifies dimensional requirements on threads and thread gauges, stipulations on gauging practice and gauge specifications, as well as instruments and methods for inspection of thread connections.The specification applies to three preferred rotary shouldered connection designs: number (NC) style, regular (REG) style, and full hole (FH) style.
API Spec 7‑1 — Rotary Drill Stem Elements
API Spec 7‑1 covers rotary drill stem elements including kelly valves, kellys, drill stem subs, drill collars, and drilling/coring bits. All Kingdream downhole tools are manufactured under this certified quality management system, with third‑party inspection available through any accredited agency.
1. Drill Bit Specifications
Kingdream offers the complete API Spec 7‑2 drill bit portfolio, with size coverage from 3 3/4″ to 26″ (95 mm – 660 mm) for tricone bits and 3 3/4″ to 17 1/2″ for PDC bits , covering every IADC code from 111 through 777.
1.1 Tricone Drill Bits — Steel Tooth (Milled Tooth) Specifications
Steel tooth bits have cutting elements machined directly into the steel cones, hardfaced with tungsten carbide. They are lower cost and perform well in soft to medium formations.
Material and Construction Specifications:
| Parameter | Specification |
|---|---|
| Bit diameter range | 3 3/4″ to 26″ (95 mm – 660 mm) |
| Material | High‑manganese steel with tungsten carbide hardfacing |
| Hardfacing application | On all surfaces of cutting structure and shirttail tip |
| Cone locking | Ball‑locked cone — reduces cone drop probability |
| Bearing surfaces | Hardfaced with friction‑reducing alloy, silver‑plated |
| Common IADC codes | 111, 115, 116, 117, 126, 127, 131, 136, 137, 216, 217, 316, 317, 326, 327, 336, 337 |
1.2 Tricone Drill Bits — TCI (Tungsten Carbide Insert) Specifications
TCI bits use pressed‑to‑shape tungsten carbide inserts installed into the cones. They are more durable and used in medium‑hard to extremely hard, abrasive formations.
Material and Cutting Structure Specifications:
| Parameter | Specification |
|---|---|
| Bit diameter range | 3 3/4″ to 26″ |
| Insert material | Premium tungsten carbide (spherical, conical, chisel shapes) |
| Insert projection | Large diameter and high projection for maximum penetration |
| Bearing options | Sealed journal bearing (rubber O‑ring) or metal face seal |
| Gage protection | Multiple gage trimmers on heel of cone; tungsten carbide inserts and hardfacing on shirttail |
Bearing Seal Options — IADC Third Digit (Steel Tooth & TCI):
| IADC Bearing Code | Bearing Type | Seal Type | Application |
|---|---|---|---|
| 1 | Open roller/ball | None | Soft formations, low cost |
| 2 | Open roller/ball | None (air drilling) | Air drilling applications |
| 3 | Open roller/ball | None (gage protection) | Soft‑medium formations with abrasion |
| 4 | Sealed roller bearing | Rubber O‑ring | General purpose, moderate life |
| 5 | Sealed journal bearing | Rubber O‑ring | Medium‑hard formations, higher load |
| 6 | Sealed journal bearing | Metal face seal | Hard formations, high temperature, heavy load |
| 7 | Sealed journal bearing + gage protection | Metal face seal | Extreme conditions, ultra‑deep wells |
1.3 IADC Code Quick Reference — Tricone Bits
The IADC three‑digit code is the global classification standard for roller cone bits, providing an immediate specification summary.
| First Digit | Cutting Structure | Second Digit | Formation Hardness | Third Digit | Bearing/Seal Design |
|---|---|---|---|---|---|
| 1–3 | Steel tooth (milled tooth) | 1 | Very soft | 1 | Open roller/ball bearing |
| 4–8 | TCI (tungsten carbide insert) | 2 | Soft | 2 | Open bearing (air) |
| — | — | 3 | Medium‑soft | 3 | Open bearing, gage protection |
| — | — | 4 | Medium | 4 | Sealed roller bearing |
| — | — | 5 | Medium‑hard | 5 | Sealed journal bearing |
| — | — | 6 | Hard | 6 | Metal face seal bearing |
| — | — | 7 | Very hard | 7 | Metal face seal + gage protection |
| — | — | 8 | Extremely hard | — | — |
Common IADC codes for steel tooth bits: 115, 116, 117, 126, 127, 136, 137, 216, 217, 316, 317, 326, 327, 336, 337
Common IADC codes for TCI bits: 417, 437, 515, 517, 535, 537, 617, 637, 737
2. PDC (Polycrystalline Diamond Compact) Bit Specifications
PDC bits use synthetic diamond cutters that shear rock rather than crush it, delivering faster rates of penetration and longer bit life in suitable formations.
2.1 PDC Bit General Specifications
| Parameter | Specification |
|---|---|
| Bit diameter range | 3 3/4″ – 17 1/2″ (95 mm – 445 mm) |
| Body type | Steel body or tungsten carbide matrix body |
| Cutter diameter | 13 mm, 16 mm, 19 mm, 25 mm (premium synthetic diamond compacts) |
| Cutter shape | Planar and non‑planar (shaped‑cutter) options |
| Blade count | 3 to 9 blades (optimized for formation and drilling parameters) |
| Recommended ROP | 8–60 m/h depending on formation |
| Hydraulic design | CFD‑optimised nozzle placement |
2.2 PDC Bit Blade and Cutter Specifications
| Bit Diameter (inches) | Typical Blade Count | Recommended Cutter Size | Connection |
|---|---|---|---|
| 3″ – 5″ (76–127 mm) | 3–4 blades | 13 mm | 2 7/8″ API REG |
| 5″ – 7″ (127–178 mm) | 4–5 blades | 13 mm or 16 mm | 3 1/2″ API REG |
| 7″ – 9″ (178–229 mm) | 5–6 blades | 16 mm | 4 1/2″ API REG |
| 9″ – 13″ (229–330 mm) | 6–7 blades | 16 mm or 19 mm | 6 5/8″ API REG |
| 13″ – 17 1/2″ (330–445 mm) | 7–9 blades | 19 mm or 25 mm | 6 5/8″ or 7 5/8″ API REG |
2.3 PDC Bit Body Selection
| Body Type | Material | Key Specification | Application |
|---|---|---|---|
| Steel body | High‑strength alloy steel | Excellent toughness, lower cost | Soft to medium formations, cost‑sensitive operations |
| Matrix body | Tungsten carbide matrix cast around steel core | Superior erosion/abrasion resistance | Hard, abrasive formations; high‑velocity drilling fluids |
3. Diamond Drill Bit Specifications (Ultra‑Deep / Hard Formation)
For the world's deepest wells and most challenging formations, Kingdream’s diamond drill bits provide the extreme durability required.
| Parameter | Specification |
|---|---|
| Bit diameter range | 3 3/4″ to 26″ |
| Types available | Impregnated diamond, surface‑set natural diamond, diamond‑enhanced PDC, four‑blade KSF fast drilling diamond |
| Cutting mechanism | Combined "drilling force” and "grinding force” through circular superhard diamond composite sheets |
| Matrix material | Premium tungsten carbide matrix body |
| Application | Ultra‑deep wells (>7,000 m), extremely hard/abrasive formations |
| Weight capacity | Supports cumulative BHA weight exceeding 2,000 metric tons |
| Field validation | Proven in China's first 10,000‑m ultra‑deep well, Shendi Take 1; shattered over 30 performance records in Tarim Basin |
4. Downhole Motor Specifications
Kingdream’s KD Force downhole motors feature super‑large torque output and uniform stress distribution, handling complex formations with ease while reducing the risk of stress concentration and fatigue failure.
4.1 KD Force Downhole Motor — Performance Specifications
| Parameter | Specification |
|---|---|
| Outer diameter range | 3 1/2″ – 9 1/2″ |
| Rotor material | High‑quality alloy steel |
| Stator material | Rubber with high force and tearing strength |
| Operating temperature (standard) | ~120 ℃ (248 °F) |
| Operating temperature (high‑temp) | ~180 ℃ (355 °F) |
| Operating differential pressure | Up to 8.1 MPa (1,174 psi) depending on size |
| Flow range | 636 – 1,272 L/min (4.0 – 8.0 BPM) for typical sizes |
| Torque output | Super‑large torque output (varies by size; up to 14,250 N·m for large models) |
| Stress distribution | Uniform across motor length, reducing fatigue failure risk |
| Oil‑mud compatibility | Suitable for high‑oil‑mud conditions |
4.2 Downhole Motor Selection — By Diameter
| Motor Diameter (inches) | Flow Range (L/min) | Typical RPM Range | Bit Range (inches) | Thread Type |
|---|---|---|---|---|
| 3 1/2″ | 150 – 300 | 200 – 400 | 3 3/4″ – 5″ | 2 7/8″ REG |
| 4 3/4″ | 250 – 500 | 150 – 350 | 6″ – 7″ | 3 1/2″ REG |
| 6 3/4″ | 500 – 900 | 100 – 250 | 7″ – 8 1/2″ | 4 1/2″ REG |
| 8″ | 700 – 1,200 | 80 – 200 | 8 1/2″ – 12 1/4″ | 6 5/8″ REG |
| 9 1/2″ | 1,000 – 1,600 | 60 – 150 | 12 1/4″ – 17 1/2″ | 6 5/8″ or 7 5/8″ REG |
4.3 Torque Impactor Specifications
Torque impactors reduce stick‑slip and torsional vibration, protecting the BHA and drill bit while improving drilling efficiency.
| Parameter | Specification |
|---|---|
| Function | Reduces stick‑slip and torsional vibration |
| Integration | Placed between drill bit and downhole motor |
| Application | Interbedded formations, directional drilling, extended laterals |
5. Drill Collar and Stabilizer Specifications
5.1 Drill Collar Specifications
Kingdream offers three types of drill collars: slick (standard), spiral, and non‑magnetic, all conforming to API Spec 7‑1.
| Parameter | Slick Drill Collar | Spiral Drill Collar | Non‑Magnetic Drill Collar |
|---|---|---|---|
| Diameter range | 3 1/8″ – 10″ | 3 1/8″ – 10″ | 3 1/8″ – 10″ |
| Material | AISI 4145H modified alloy steel | AISI 4145H modified alloy steel | Non‑magnetic alloy steel |
| Heat treatment | Full‑length, Brinell 285 – 341 | Full‑length, Brinell 285 – 341 | Specialized non‑magnetic processing |
| Impact strength | Min. 40 ft‑lbs IZOD | Min. 40 ft‑lbs IZOD | Application‑dependent |
| Key advantage | BHA stiffness and weight for WOB transfer | Reduces differential sticking risk | Compatible with MWD survey instruments |
Drill collar threading (rotary shouldered connections): API Spec 7‑2 REG style, 3 1/2″ REG to 7 5/8″ REG depending on collar OD.
5.2 Stabilizer Specifications
| Parameter | Integral Blade Stabilizer | Sleeve Stabilizer |
|---|---|---|
| Diameter range | 6″ – 12″ | 6″ – 12″ |
| Blade count | 3 or 4 spiral blades | Replaceable sleeve |
| Hardfacing | Tungsten carbide on blade surfaces | Tungsten carbide on sleeve wear surfaces |
| Application | Wellbore trajectory control, maintaining BHA stiffness | Same, with replaceable wear surfaces for extended life |
| Material | High‑strength alloy steel | High‑strength alloy steel (body); wear‑resistant alloy (sleeve) |
6. Rotary Sub Specifications
Rotary subs connect different components of the drill string and BHA.
| Parameter | Lift Sub | Crossover Sub | Kelly Saver Sub |
|---|---|---|---|
| Thread sizes | 2 7/8″ – 7 5/8″ REG | Custom (any API REG/IF/FH combination) | 4 1/2″ – 6 5/8″ REG |
| Material | AISI 4145H modified alloy steel | AISI 4145H modified alloy steel | High‑strength alloy steel |
| Standard length | 36″ or 48″ | As specified by customer | 36″ or 48″ |
| Hardness | Brinell 285 – 341 | Brinell 285 – 341 | Brinell 285 – 341 |
| Key advantage | Handling BHA components (lifting point) | Connecting different thread sizes/types | Extends kelly life by absorbing connection wear |
7. Recommended Operating Parameters
7.1 Tricone Bit Operating Parameters — WOB and RPM by IADC Code
These values provide general starting ranges. Adjust based on downhole conditions, formation hardness, and bit diameter.
| IADC Code Range | Recommended WOB (kN/mm of bit diameter) | Recommended Rotary Speed (RPM) | Typical Formation |
|---|---|---|---|
| 111–117 | 0.3–0.75 | 200–80 | Very soft, low compressive strength |
| 211–247 | 0.5–1.0 | 180–70 | Soft to medium |
| 311–347 | 0.75–1.1 | 160–60 | Medium to hard |
| 417–447 | 0.75–1.1 | 160–60 | Very soft to soft (TCI) |
| 517–547 | 1.0–1.5 | 120–40 | Soft to medium (TCI) |
| 617–647 | 1.3–1.8 | 90–35 | Medium to hard (TCI) |
| 737–777 | 1.5–2.0 | 70–25 | Hard to extremely hard (TCI) |
Steel tooth bits (IADC 100–300 series): 8 1/2″ bit operating at 80 RPM in soft formation typically requires 100–150 kN WOB. Refer to IADC code for specific guidance.
TCI bits (IADC 400–800 series): Higher WOB and lower RPM characteristic — maximum WOB increases with IADC series.
7.2 PDC Bit Operating Parameters — WOB and RPM
| Formation Type | WOB (kN/mm of bit diameter) | Rotary Speed (RPM) | Torque Range (kN·m) |
|---|---|---|---|
| Very soft | 0.3–0.8 | 150–300 | 5–15 |
| Soft | 0.6–1.0 | 120–220 | 10–25 |
| Medium | 0.8–1.2 | 100–180 | 20–40 |
| Medium‑hard | 1.0–1.5 | 80–140 | 30–55 |
| Hard | 1.2–1.8 | 60–100 | 45–70 |
7.3 Downhole Motor Operating Parameters
| Parameter | Typical Specification |
|---|---|
| Operating differential pressure | Up to 8.1 MPa (1,174 psi) for KD Force motors |
| Flow rate | 400 – 1,600 L/min (depending on motor diameter) |
| Rotational speed | 60 – 400 RPM (motor output, before bit) |
| Torque output | 2,000 – 14,250 N·m (depending on size and differential pressure) |
| Temperature rating (high‑temp) | Up to 180 °C (355 °F) with high‑temp elastomers |
8. API Connection Thread Specifications — Downhole Tools
All Kingdream downhole tools use API rotary shouldered connections conforming to API Spec 7‑2, the industry standard for rotary shouldered connections in the petroleum and natural gas industries.The specification covers three preferred connection designs: NC (number) style, REG (regular) style, and FH (full hole) style.
8.1 API REG (Regular) Connection Sizing — By Bit Diameter
| Bit Diameter (inches) | Pin Connection (API REG) | Recommended Make‑Up Torque (kN·m) | Recommended Make‑Up Torque (ft‑lbs) |
|---|---|---|---|
| ≤ 4 3/4″ | 2 7/8″ REG | 4.5 – 6.5 | 3,300 – 4,800 |
| 5 1/2″ – 6 1/2″ | 3 1/2″ REG | 9.5 – 12.2 | 7,000 – 9,000 |
| 7 7/8″ – 8 1/2″ | 4 1/2″ REG | 16.3 – 21.7 | 12,000 – 16,000 |
| 9 7/8″ – 13 3/4″ | 6 5/8″ REG | 37.9 – 43.3 | 28,000 – 32,000 |
| 14 3/4″ – 26″ | 7 5/8″ REG | 48.0 – 58.0 | 35,000 – 43,000 |
8.2 API Thread Inspection Specifications
API Spec 7‑2 includes requirements for:
-
Dimensional requirements on threads and thread gauges
-
Stipulations on gauging practice and gauge specifications
-
Instruments and methods for inspection of thread connections
[Product images: API Spec 7‑2 connection thread chart — REG thread dimensions for all downhole tools]
9. Certification and Quality Specifications
9.1 API Certification Status
Kingdream has successfully passed the 2025 API certification audit, including:
-
API Q1/ISO 9001 quality management system surveillance audit
-
Roller cone bit monogram surveillance audit
-
Diamond bit monogram recertification audit
The company holds API Spec 6A/16A/16C certifications through its subsidiary Chengde Kingdream, covering wellhead equipment, BOPs, and choke and kill manifolds.
9.2 ISO and HSE Certification
Kingdream and its subsidiaries maintain:
-
ISO 9001 quality management system certification
-
HSE (Health, Safety, Environment) system certification
-
CCS (China Classification Society) certification
9.3 Material Specifications
| Component | Material Specification | Hardness |
|---|---|---|
| Drill collar (standard) | AISI 4145H modified alloy steel | Brinell 285–341 |
| Drill collar (non‑magnetic) | Non‑magnetic alloy steel | Application‑dependent |
| Tricone bit steel tooth | High‑manganese steel with tungsten carbide hardfacing | RC 55–60 on hardfacing |
| TCI inserts | Premium tungsten carbide | Hardness varied by insert shape |
| PDC cutters | Synthetic diamond compact (polycrystalline diamond + carbide substrate) | Diamond table hardness |
| Rotary sub | AISI 4145H | Brinell 285–341 |
10. Application Specifications — Matching Tool to Formation
| Application | Formation Characteristics | Recommended Tool Specifications | Key Specifications |
|---|---|---|---|
| Very soft formations (shallow top-hole) | Low compressive strength, sticky, non‑abrasive | Steel tooth tricone, IADC 111–137, open bearing | WOB 0.3–0.75 kN/mm, RPM 200–80 |
| Soft formations (conventional onshore) | Low to medium strength, some abrasion | Steel tooth tricone, IADC 211–247, open bearing with gage | WOB 0.5–1.0 kN/mm, RPM 180–70 |
| Medium formations (directional wells) | Variable strength, interbedded | PDC bit — 5–6 blades, 16 mm cutters, steel body | WOB 0.8–1.2 kN/mm, RPM 100–180 |
| Medium‑hard, abrasive | High compressive strength, abrasive | TCI tricone, IADC 517–547, sealed journal bearing | WOB 1.0–1.5 kN/mm, RPM 120–40 |
| Hard, highly abrasive (deep wells >5,000 m) | Very high strength, extremely abrasive | TCI tricone, IADC 617–647, metal face seal bearing | WOB 1.3–1.8 kN/mm, RPM 90–35 |
| Ultra‑deep wells (>7,000 m) | Extremely hard, high confining stress | Diamond drill bit + KD Force high‑torque motor | Diamond cutting; motor torque >10,000 N·m |
| Horizontal / extended reach | Variable, interbedded, directional control required | RSS PDC bit + KD Force motor + stabilizers | Shaped‑cutter PDC; motor uniform stress distribution |
| Complex interlayered | Alternating soft/hard beds, hard plastic | Three‑stage hybrid bit + torque impactor | Patented hybrid crushing; torque impactor reduces stick‑slip |
Why Choose Kingdream for Your Downhole Tool Specifications
1. National Manufacturing Champion — Industry‑Highest Recognition
Kingdream has been honored as a National Manufacturing Single Item Champion Demonstration Enterprise for its roller cone bits — the highest recognition for Chinese manufacturing in the drill bit sector. The KINGDREAM trademark is recognized as a well‑known trademark in China.
2. Complete API Spec 7‑2 and 7‑1 Certification
All Kingdream downhole tools comply with API Spec 7‑2 (rotary shouldered connections) and API Spec 7‑1 (rotary drill stem elements) , with full third‑party inspection available through any accredited agency. Kingdream successfully passed the 2025 API certification audit.
3. Full Size Coverage — 3 3/4″ to 26″
Kingdream provides one‑stop specifications for downhole tools in sizes from 3 3/4″ to 26″ , with complete IADC code coverage from 111 through 777.
4. 40+ Years of Manufacturing Heritage
Kingdream has been dedicated to drill bits and tools for over 40 years in the oil and gas industry, developing extensive cross‑formation rock‑breaking experience and building a comprehensive technical specification database.
5. "Four‑Ultra” Technology System
Sinopec Equipment's core "Four‑Ultra” technology system — ultra‑high pressure structure, ultra‑hard materials, ultra‑high control ability, and ultra‑high precision manufacturing ability — provides the technological backbone for continuous innovation in downhole tool specifications.
6. Vertically Integrated Manufacturing — 17 Production Lines
SOFE has 17 production lines, an 8,000 hp pump test center and seven professional laboratories — ensuring consistent quality and complete traceability for every certified component.
7. Global Reach — 40+ Countries, All Major Continents
Kingdream has exported downhole tools to more than 40 countries and regions, including North America, South America, Russia, the Middle East and Africa.
8. Integrated R&D and Field Service
Sales personnel and technical service personnel work together on drilling sites, conducting joint tests and product selection with customers. Kingdream has established a service chain for all drilling processes.
9. Field‑Proven Performance in Extreme Conditions
Kingdream tools have set multiple performance records: 5,818 m "one trip drilling” in Tarim Basin using diamond bit + high‑torque motor; 20%+ ROP improvement in Kuwait’s carbonate reservoirs; and 57% ROP improvement in Algeria's Sonatrach Southwest block using hybrid bits.
Frequently Asked Questions (FAQ)
Q1: What is API Spec 7‑2, and why does it matter for downhole tools?
API Spec 7‑2 is the industry standard for rotary shouldered connections used in petroleum and natural gas drilling. It specifies dimensional requirements on threads and thread gauges, stipulations on gauging practice, gauge specifications, as well as instruments and methods for inspection of thread connections.All Kingdream downhole tools comply with API Spec 7‑2, ensuring connection compatibility and thread integrity across the entire drill string.
Q2: What is the IADC code, and how do I use it to select a drill bit?
The IADC three‑digit code classifies every roller cone drill bit:
-
First digit (1–8): Cutting structure and formation series (1‑3 = steel tooth; 4‑8 = TCI)
-
Second digit (1–8): Formation hardness within that series (1 = very soft … 8 = extremely hard)
-
Third digit (1–7): Bearing, seal and gage protection design (1 = standard open … 7 = sealed journal with gage protection)
Use the IADC code to match the bit to your formation. For soft formations, select IADC 111–217. For hard, abrasive formations, select IADC 617–777.
Q3: What size range do Kingdream downhole tools cover?
-
Tricone bits: 3 3/4″ to 26″
-
PDC bits: 3 3/4″ to 17 1/2″
-
Diamond bits: 3 3/4″ to 26″
-
Downhole motors: 3 1/2″ to 9 1/2″
-
Drill collars: 3 1/8″ to 10″
Q4: What API connection threads are used on Kingdream downhole tools?
Kingdream downhole tools use API REG (regular) style threads conforming to API Spec 7‑2, with sizes ranging from 2 7/8″ REG to 7 5/8″ REG depending on tool diameter. REG connections are the industry standard for rotary drilling equipment.
Q5: What is the difference between steel tooth and TCI tricone bits?
Steel tooth (milled tooth) bits have cutting elements machined directly into the steel cones and hardfaced with tungsten carbide. They are lower cost and suited for soft to medium formations (IADC 111–347). TCI (tungsten carbide insert) bits have pressed‑to‑shape tungsten carbide inserts installed into the cones. They are much more durable and used in medium‑hard to extremely hard, abrasive formations (IADC 417–777).
Q6: What is the difference between steel body and matrix body PDC bits?
Steel body PDC bits are machined from high‑strength alloy steel — excellent toughness, lower cost, suitable for softer formations. Matrix body PDC bits use a tungsten carbide matrix material cast around a steel core — superior erosion and abrasion resistance, ideal for hard, abrasive formations and high‑velocity drilling fluids.
Q7: What are the recommended WOB and RPM for TCI bits in hard formations?
For IADC 617–647 TCI bits in hard formations (deep wells >5,000 m), recommended operating specifications: WOB 1.3–1.8 kN/mm of bit diameter, RPM 90–35. For extremely hard formations (IADC 737–777), WOB 1.5–2.0 kN/mm, RPM 70–25.
Q8: What is the operating temperature rating for Kingdream downhole motors?
Standard Kingdream downhole motors are rated for approximately 120 ℃ (250 °F) . For high‑temperature and ultra‑deep well applications, Kingdream offers motors with advanced elastomers rated for continuous operation up to 180 ℃ (355 °F) — validated in Tarim Basin ultra‑deep wells.
Q9: What is the typical lead time for Kingdream downhole tools?
For standard sizes (8 1/2″, 12 1/4″) and common IADC codes, typical lead time is 4–6 weeks from order confirmation to shipment. Custom tool strings and integrated BHA packages require 6–8 weeks depending on specifications.
Q10: Does Kingdream provide custom downhole tool specifications for specific well conditions?
Yes. Kingdream's R&D and marketing teams are integrated, promoting combined design and supply of drill bits and downhole tools. Share your well plan, formation data and drilling parameters, and Kingdream’s engineering team will specify every component of the downhole tool string to your exact requirements.
Q11: What are the material specifications for Kingdream drill collars?
Standard Kingdream drill collars are manufactured from AISI 4145H modified alloy steel, full‑length heat treated to Brinell hardness 285–341 with minimum impact strength of 40 ft‑lbs IZOD. Non‑magnetic drill collars use specialized non‑magnetic alloy steel for MWD and survey compatibility.
Q12: What is the make‑up torque specification for API REG connections?
-
3 1/2″ REG: 9.50 – 12.2 kN·m (7,000 – 9,000 ft‑lbs)
-
4 1/2″ REG: 16.30 – 21.70 kN·m (12,000 – 16,000 ft‑lbs)
-
6 5/8″ REG: 37.93 – 43.30 kN·m (28,000 – 32,000 ft‑lbs)
Proper make‑up torque is critical for connection integrity. Always use API‑specified torque values for the specific connection size.
Q13: Does Kingdream provide third‑party inspection for downhole tools?
Yes. Kingdream's manufacturing process can be supervised by customers and inspected by any third‑party certification agency — DNV, ABS, Lloyd’s, or any other accredited inspector. Complete traceability documentation is provided for every certified component.
Q14: What is the global downhole tools market outlook?
The global downhole tools market size was valued at USD 4.10 billion in 2025 and is projected to grow to USD 6.31 billion by 2034, exhibiting a CAGR of 4.88%. The market is driven by increased drilling activity in the Middle East, North America and offshore basins, as well as ongoing replacement of older tools with API‑certified equivalents.
Q15: What is the "Four‑Ultra” technology system?
Sinopec Equipment's core "Four‑Ultra” technology system — ultra‑high pressure structure, ultra‑hard materials, ultra‑high control ability, and ultra‑high precision manufacturing ability — provides the technological backbone for continuous innovation in downhole tool specifications, ensuring consistent breakthrough performance in the world’s most challenging drilling environments.
