Directional drilling tools
Technical Specifications – Directional Drilling Tools Range
The tables below present key specifications for our most requested directional drilling tools. All specifications comply with API standards and are customizable.
Downhole Mud Motors (PDM) – KD Force Series
| Parameter | 5LZ73 (2‑7/8") | 5LZ95 (3‑3/4") | 5LZ120 (4‑3/4") | 5LZ165 (6‑1/2") | 7LZ197 (7‑3/4") | 7LZ244 (9‑5/8") |
|---|---|---|---|---|---|---|
| Outer diameter (mm/in) | 73 / 2.87 | 95 / 3.74 | 120 / 4.72 | 165 / 6.50 | 197 / 7.76 | 244 / 9.61 |
| Recommended bit size (mm/in) | 95‑121 / 3.7‑4.8 | 118‑149 / 4.6‑5.9 | 149‑200 / 5.9‑7.9 | 200‑250 / 7.9‑9.8 | 250‑311 / 9.8‑12.2 | 311‑445 / 12.2‑17.5 |
| Lobe configuration | 1:2 / 5:6 | 5:6 / 7:8 | 5:6 / 7:8 | 5:6 / 7:8 | 7:8 / 9:10 | 7:8 / 9:10 |
| Flow rate range (L/s) | 3‑8 | 8‑16 | 12‑24 | 20‑35 | 28‑48 | 45‑70 |
| Operating differential pressure (MPa/psi) | 3‑5 / 435‑725 | 4‑6 / 580‑870 | 4‑6 / 580‑870 | 5‑7 / 725‑1015 | 5‑7 / 725‑1015 | 6‑8 / 870‑1160 |
| Output torque (N·m) up to | 800 | 2,200 | 4,500 | 8,500 | 13,500 | 22,000 |
| Bit speed range (rpm) | 150‑300 | 100‑250 | 80‑220 | 70‑180 | 60‑150 | 50‑120 |
| Working temperature (°C) | 120 / 150 (opt.) | 120 / 150 (opt.) | 120 / 150 (opt.) | 120 / 150 (opt.) | 120 / 150 (opt.) | 120 / 150 (opt.) |
| Bending angle (adjustable) | 0‑1.5° | 0‑1.5° | 0‑2.0° | 0‑2.0° | 0‑2.5° | 0‑3.0° |
| Stator material | NBR oil‑resistant | NBR oil‑resistant | NBR / HNBR | NBR / HNBR | HNBR (high‑temp) | HNBR (high‑temp) |
| API Spec | 7‑1 | 7‑1 | 7‑1 | 7‑1 | 7‑1 | 7‑1 |
| Total length (m) | 3.5‑4.2 | 4.5‑5.2 | 5.5‑6.5 | 6.5‑7.5 | 7.5‑8.5 | 8.5‑9.5 |
Stabilizers (Integral Blade & Replaceable Sleeve)
| Parameter | 4‑1/2" | 5" | 6‑1/2" | 8" | 9‑1/2" | 11" |
|---|---|---|---|---|---|---|
| Outer diameter (in) | 4.5 | 5.0 | 6.5 | 8.0 | 9.5 | 11.0 |
| Hole size range (in) | 6‑1/8 to 6‑3/4 | 6‑1/8 to 8‑1/2 | 8‑1/2 to 9‑7/8 | 9‑7/8 to 12‑1/4 | 12‑1/4 to 17‑1/2 | 17‑1/2 to 26 |
| Connection type | NC38 / 3‑1/2" IF | NC38 / NC46 | NC46 / NC50 | 5‑1/2" FH / NC56 | 6‑5/8" REG | 7‑5/8" REG |
| Blade type | Integral spiral | Replaceable sleeve | Integral / sleeve | Integral / sleeve | Integral spiral | Replaceable sleeve |
| Blade count | 3 | 3 or 4 | 3 or 4 | 4 | 4 | 4 |
| Body material | AISI 4145H | AISI 4145H | AISI 4145H | AISI 4145H | AISI 4145H | AISI 4145H |
| Hardfacing | Tungsten carbide | Tungsten carbide | Tungsten carbide | Tungsten carbide | Tungsten carbide | Tungsten carbide |
| API Spec | 7‑1 | 7‑1 | 7‑1 | 7‑1 | 7‑1 | 7‑1 |
Drilling Jars (Hydraulic & Mechanical) – API 8C
| Parameter | SJY121 (4‑3/4") | SJY165 (6‑1/2") | SJY203 (8") | SJY279 (11") |
|---|---|---|---|---|
| Outer diameter (mm/in) | 121 / 4.8 | 165 / 6.5 | 203 / 8.0 | 279 / 11.0 |
| Connection | NC38 | NC50 | 6‑5/8 REG | 7‑5/8 REG |
| Max. tensile load (kN/klbf) | 350 / 78.7 | 700 / 157.4 | 1,000 / 224.8 | 1,500 / 337.2 |
| Up jarring force (kN/klbf) | 350 / 78.7 | 700 / 157.4 | 1,000 / 224.8 | 1,500 / 337.2 |
| Down jarring force (kN/klbf) | 180 / 40.5 | 350 / 78.7 | 500 / 112.4 | 800 / 179.8 |
| Full open length (mm/in) | 8,950 / 352 | 9,260 / 365 | 9,786 / 385 | 10,500 / 413 |
| Temperature rating | 120°C / 150°C (opt.) | 120°C / 150°C (opt.) | 120°C / 150°C (opt.) | 120°C (200°C opt.) |
| API Spec | 8C | 8C | 8C | 8C |
| Operation type | Double‑acting mechanical‑hydraulic | Double‑acting | Double‑acting | Double‑acting |
MWD System – Typical Specifications
| Parameter | Value |
|---|---|
| Outer diameter (mm/in) | 48 / 1.9 to 178 / 7.0 |
| Directional survey range (inclination) | 0 – 180° |
| Inclination accuracy | ±0.1° |
| Azimuth accuracy | ±0.5° (dependent on latitude) |
| Toolface accuracy | ±1.5° (magnetic), ±2.0° (gravity) |
| Telemetry type | Mud pulse (positive / negative) |
| Data transmission rate | 0.5 – 3.0 bits per second |
| Downhole weight on bit (DWOB) | Real‑time, ±5% accuracy |
| Downhole torque measurement | Real‑time, ±5% accuracy |
| Temperature measurement | –20 to +175°C, ±1°C |
| Vibration measurement | 3‑axis accelerometer |
| Maximum temperature rating | 125°C / 150°C / 175°C (options) |
| Maximum pressure rating | 20,000 PSI (138 MPa) |
| Battery life | 100 – 300 hours (depending on telemetry rate) |
MWD systems can be integrated with gamma ray and resistivity LWD sensors for full geosteering capabilities.
Crossovers, Lifting Subs & Various Subs (API Spec 7‑1)
| Connection Type (Top) | Connection Type (Bottom) | Length (ft/in) | Material |
|---|---|---|---|
| NC38 (3‑1/2" IF) | NC46 (4" IF) | 3.5 / 42" | AISI 4145H |
| NC46 (4" IF) | NC50 (4‑1/2" IF) | 4.0 / 48" | AISI 4145H |
| NC50 | 4‑1/2" REG | 4.0 / 48" | AISI 4145H |
| 4‑1/2" REG | 5‑1/2" REG | 4.5 / 54" | AISI 4145H |
| 5‑1/2" REG | 6‑5/8" REG | 5.0 / 60" | AISI 4145H |
| 6‑5/8" REG | 7‑5/8" REG | 5.5 / 66" | AISI 4145H |
*Custom crossovers for any pin/box combination (including proprietary connections) are available on request. Lifting subs are designed with dedicated handling grooves and lift points per API 8C.*
Product Types – Complete Directional Drilling Tools Portfolio
We manufacture and supply the full spectrum of directional drilling tools:
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Downhole Mud Motors (PDM / KD Force series) – 2‑7/8" to 11‑1/4" sizes. Straight, single‑bend, double‑bend, and adjustable bent housing configurations. Extended power sections for higher torque.
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Bent Subs & Adjustable Bent Housings – Fixed and adjustable angle configurations (0.5° to 3.0°). Scribe line indexed for accurate toolface orientation.
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MWD & LWD Systems – Real‑time directional survey (inclination, azimuth, toolface), downhole weight on bit, torque, temperature, vibration, and formation evaluation via gamma ray and resistivity sensors. Mud pulse telemetry. Battery or turbine powered.
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Rotary Steerable Systems (RSS) – Point‑the‑bit and push‑the‑bit designs for continuous rotation steering without slide drilling.
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Stabilizers – Integral blade (straight or spiral), replaceable sleeve, and eccentric adjustable types. Tungsten carbide hardfacing for extended wear life.
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Drilling Jars (Hydraulic & Mechanical) – Double‑acting hydraulic‑mechanical jars (SJY series). Adjustable jarring force, high load capacity, temperature ratings to 200°C.
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Reamers & Hole Openers – For enlarging pilot holes, opening casing windows, and under‑reaming operations. Fixed blade and expandable designs.
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Crossovers, Lifting Subs & Various Subs – Any thread combination (API NC series, REG, FH, IF, proprietary). Stress‑relieved design, full magnetic particle inspection.
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Shock Subs / Vibration Dampeners – Torsional and axial vibration reduction to protect MWD electronics and extend downhole motor life in hard rock.
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Float Subs – Incorporating check valves to prevent backflow of drilling fluid and cuttings during connections.
Applications – Where Our Directional Drilling Tools Excel
Our directional drilling tools are field‑proven across the full spectrum of modern drilling:
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Horizontal drilling (long‑reach wells, >2,000 m lateral) – High‑torque KD Force mud motors with extended power sections deliver consistent drive over long laterals. MWD tools provide continuous inclination and toolface updates.
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Extended reach drilling (ERD) – Our RSS and high‑performance stabilizers manage torque‑and‑drag while maintaining hole cleaning efficiency. Real‑time downhole torque and WOB data from MWD optimize surface parameters.
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Sidetracking & thru‑tubing drilling – Slim‑hole motors (2‑7/8" to 3‑3/4") for sidetracking through whipstocks or milling windows. Small‑diameter subs and bent housings for restricted clearances.
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Deep & ultra‑deep vertical sections – Large‑diameter motors (7‑3/4" to 11‑1/4") for high torque requirements. Integrated stabilizers maintain hole straightness.
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Pad drilling and cluster wells – MWD and RSS enable precise anti‑collision management when wells are closely spaced. Toolface control minimizes tortuosity.
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Hard rock & abrasive formations (granite, basalt, quartzite) – TCI‑enhanced stabilizer hardfacing. Heavy‑duty shock subs protect downhole electronics. High temperature rated components (150‑175°C) for deep, hot wells.
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Coal bed methane (CBM) & shallow gas – Lightweight, short‑length motors for shallow, low‑hydraulics applications. Single‑bend configurations for gentle build rates.
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Well intervention & workover – Small‑diameter motors (2‑7/8" to 4‑3/4") for milling and drilling through existing completion hardware.
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Offshore platform directional drilling – Compact, corrosion‑resistant construction with ATEX/IECEx certification available on request.
Why Choose SJ Petro as Your Directional Drilling Tools Supplier?
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Sinopec‑backed quality & resources – We are a direct subsidiary of China’s largest oilfield equipment group. Through Kingdream, we leverage over 40 years of dedicated downhole tool manufacturing and R&D experience. Combined with SJ Petro’s 80+ years of oilfield equipment heritage and 314 in‑house R&D engineers, we deliver unmatched technical depth.
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National record‑setting performance – In the Tarim Basin, a customized 9 1/2" four‑blade KSF pioneer diamond bit paired with a 197mm KD Force high torque equal stress downhole motor achieved 5,818 meters of one‑trip drilling — a national record. This achievement has been highly recognized by oilfield users and drilling construction parties, who sent thank‑you letters and looked forward to further cooperation.
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API Spec 7‑1 & 8C certified – Every downhole motor, stabilizer, sub, and drilling jar is manufactured under API Q1 quality management system. Full material traceability (EN 10204 3.1), dimensional reports, NDE (MPI, UT) reports, and hydrostatic/function test certificates provided.
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Integrated design — bits & motors together – Kingdream has developed functional products including comprehensive drilling series, directional drilling series, hard formation drilling series, core bit series, and impregnated bit series. The diamond bit size covers 3‑3/4 to 26 inches. We promote integrated design and supply of drill bits and downhole motors, providing value‑added services and complete sets of down‑hole tool strings. This means your motor and bit are pre‑matched for optimal hydraulic and mechanical performance.
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Fleet‑wide spare parts interchangeability – Standardized lobe configurations, connection threads, and seal types across our product range mean one set of spares supports your entire directional drilling fleet — reduces inventory cost and simplifies logistics.
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Field engineering support – Sales personnel and technical service personnel work together on drilling sites, conducting joint tests and product selection with customers. Our service chain covers all drilling processes — from pre‑job planning to post‑run dull analysis.
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Competitive direct‑manufacturer pricing – As an OEM manufacturer (not a trading company), we eliminate markups. You pay factory‑direct prices for Sinopec‑level quality — typically 15‑25% below Western brands for equivalent API certification.
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Global logistics – We have shipped directional drilling tools to over 30 countries, including Russia, Kazakhstan, UAE, Saudi Arabia, India, Indonesia, and North Africa. Full export documentation (commercial invoice, packing list, bill of lading, certificates of origin) provided.
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Warranty & after‑sales support – 12 months on all downhole motors, stabilizers, jars, and subs. We also provide failure analysis on returned tools (dull grading, inspection reports) to help you optimize BHA design for future runs.
Frequently Asked Questions (FAQ)
Q1: How do I choose between a downhole mud motor and a rotary steerable system (RSS)?
Mud motors are ideal for slide drilling where you need to change trajectory without rotating the drill string. They are cost‑effective for standard directional wells, sidetracking, and shallower build sections. Rotary steerable systems (RSS) are preferred for long lateral horizontal wells, complex wellpaths, and eriskoye drilling conditions where continuous rotation improves hole cleaning and reduces torque‑and‑drag. RSS costs more but often pays back through higher ROP and reduced vibration damage. We supply both and can recommend based on your specific wellpath design.
Q2: What is the typical torque output of a KD Force downhole motor?
Our KD Force high torque equal stress motors deliver up to 20% higher torque than standard motors of the same diameter. For a 7‑3/4" motor (197mm), maximum torque reaches approximately 13,500 N·m at 5‑7 MPa differential pressure. The uniform stress distribution across the power section reduces risk of stress concentration and fatigue failure, making these motors more durable and reliable in complex formations. Extended power section options are available for even higher output torque.
Q3: Can I get a downhole motor with an adjustable bent housing?
Yes — many of our motor sizes are available with adjustable bent housings that allow you to change the angle at surface before running in hole. Typical adjustment range is 0° to 3.0° in 0.25° increments. The housing has a scribe line indicating the bend direction for accurate toolface orientation relative to the motor’s alignment marks.
Q4: What is the maximum temperature rating for your MWD tools?
Standard MWD tools are rated to 125°C (257°F). High‑temperature variants (150°C / 302°F) are available, and for extreme geothermal or deep HP/HT wells, we offer 175°C (347°F) rated electronics. Battery life decreases at higher temperatures; consult our engineering team for life calculations for your specific bottomhole static temperature.
Q5: How do I know if I need a stabilizer above the motor?
A stabilizer placed directly above the motor helps centralize the BHA, reduces vibration, and improves the consistency of the build rate. It is standard practice in most directional assemblies, especially for build sections of 3°/100 ft or higher. For straight or tangent sections, a near‑bit stabilizer or string stabilizer may be sufficient. We provide BHA design recommendations based on your well plan.
Q6: Can you supply crossovers for non‑API connections?
Yes. We manufacture custom crossovers for any proprietary thread type (including Tenaris Hydril, VAM, JFE, and other premium connections). Provide us with the top and bottom connection specifications (pin/box, size, pitch, taper), and our threading shop will manufacture to your requirements with full thread gauge certification.
Q7: What is the typical lifespan of a downhole mud motor?
With proper operating parameters (flow rate within range, differential pressure not exceeding maximum, avoiding bit balling), a PDM power section typically lasts 150‑300 rotating hours. Seals, bearings, and universal joints are consumable items and should be inspected after each run. Our KD Force motors incorporate uniform stress distribution technology to reduce stress concentration, extending service life in demanding applications.
Q8: Do you provide rental or lease options for directional drilling tools?
Yes — we offer short‑term rentals (30‑180 days) for downhole motors, stabilizers, jars, and MWD systems. Rental includes spares and remote technical support. We also offer "performance‑based” contracts where rental rates include runtime guarantees. Contact our rental desk for availability and rates.
Q9: How do I get a dull bit analysis to improve my BHA performance?
Ship your dull motors, stabilizers, and bits to our Kingdream analysis laboratory. Our technicians will perform IADC dull grading, magnetic particle inspection, dimensional inspection, and failure mode analysis. You receive a written report identifying wear mechanisms (abrasion, impact damage, thermal degradation, etc.) and actionable recommendations for your next run — adjust WOB, change RPM, or modify BHA configuration.
