Classification of downhole tools

Technical Parameters – Kingdream Downhole Tool Classification

The following table provides a high‑level summary of each tool category’s key specifications. Detailed data sheets are available on request.

Tool Category	Size Range (OD)	Temperature Rating	Max Pressure	Key API Standard
PDC Drill Bits	3‑¾″ – 26″	N/A (matrix/steel body)	N/A	API 7‑1
Roller Cone Bits	4‑¾″ – 26″	N/A	N/A	API 7‑1
Mud Motors (PDM)	43 mm – 286 mm (1.7″ – 11.25″)	150°C (std), 175°C (HT)	20,000 psi	API 7‑1
MWD Tools	48 mm (1.89″) – 121 mm	150°C (std), 175°C (HT)	20,000 psi	API Q1, 7
Drilling Jars	2‑⅞″ – 8″	150°C	15,000 psi	API 7‑2
Stabilizers	4‑¾″ – 12‑¼″	N/A (hardfaced)	N/A	API 7‑1
Non‑Magnetic Drill Collars	3‑½″ – 9‑½″	N/A	N/A	API 7‑1 (PSL2)
Fishing Overshots	To match fish OD (2″ – 10″)	150°C	15,000 psi	API 7‑2

Application Fields by Tool Classification

Different well types and drilling conditions call for different combinations of downhole tools. Here is how our classification applies to common applications:

🏗️ Vertical Wells (Conventional)

• Tools used: PDC or roller cone bit + drill collar + jar (optional) + stabilizer (for hole cleaning)

• No MWD required (straight hole)

📐 Directional and Build‑Section Wells

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

• MWD provides real‑time inclination and toolface – essential for building angle

📏 Horizontal and Extended‑Reach Wells

• Tools used: Same as directional, plus:

  • Turbine‑powered MWD (longer run time)

  • Multiple stabilizers in the BHA for lateral control

  • Heavy‑weight drill pipe above the BHA to control torque and drag

⛽ Underbalanced and Air Drilling

• Tools used: EM‑telemetry MWD (no mud pulse) + mud motor designed for gas/liquid two‑phase flow + jar + stabilizers

• Standard mud pulse MWD does not work without a continuous fluid column

🧪 Geothermal and High‑Temperature Wells

• Tools used: High‑temperature (175°C) MWD + high‑temp elastomer mud motor + high‑temp jars

• All seals and electronics rated for extreme downhole heat

🎣 Fishing and Well Intervention

• Tools used: Overshot (to catch fish) + jar (to deliver impact) + milling tools (to dress fish) + washover pipe

• A separate fishing tool kit stocked on the rig

Product Types – Complete Downhole Tool Supply from Kingdream

Under the Kingdream brand, SJ Petro manufactures and supplies the full spectrum of downhole tools:

🔹 A. Drill Bits

• PDC bits (matrix and steel body)

• Roller cone bits (milled tooth, TCI)

• Diamond bits and core bits

🔹 B. Downhole Drilling Motors (PDM)

• Straight and adjustable bent housing

• High‑speed and high‑torque lobe configurations

• Sealed bearing and mud‑lubricated bearing versions

🔹 C. MWD & LWD Tools

• Directional MWD (inclination, azimuth, toolface)

• MWD + natural gamma

• Resistivity LWD (optional)

• Surface systems and spares

🔹 D. Drilling Jars & Shock Subs

• Hydraulic drilling jars (upward and downward impact)

• Mechanical drilling jars

• Axial and torsional shock subs

🔹 E. Stabilizers & Reamers

• Spiral blade, straight blade, replaceable sleeve

• Non‑magnetic stabilizers

• Roller reamers and hole openers

🔹 F. Non‑Magnetic Drill Collars (NMDC)

• 15‑15HS, 15‑15LC, 318 stainless grades

• Full API 7‑1 PSL2 certification

• Ultrasonic and magnetic inspection

🔹 G. Fishing Tools

• Overshots (basket, spiral, latch‑type)

• Spears (pull, rotary, releasing)

• Junk baskets, milling tools, washover pipe

• Cutting and pulling tools for packers/plugs

🔹 H. Drill Stem Components

• Heavy weight drill pipe (HWDP)

• Crossovers and subs (lift, float, lift nipple)

• Drill collars (standard and spiral)

Why Choose SJ Petro / Kingdream for Downhole Tools?

🏭 One Manufacturer, One Classification, One Quality Standard

Instead of dealing with half a dozen suppliers, you source all your downhole tools from Kingdream – a brand recognized alongside major global manufacturers. Every tool in our classification is built to consistent API standards (API Q1, API 7, API 7‑1, API 7‑2) and tested in our own facilities.

👑 Major Global Downhole Tool Manufacturer

Kingdream is one of the world’s leading downhole tool suppliers, with a product portfolio that competes directly with Baker Hughes, Schlumberger, Halliburton, and National Oilwell Varco. We are not a niche player – we supply CNPC, Sinopec, CNOOC, and international oilfields across the Middle East, Central Asia, Africa, and Russia.

🔧 Integrated Systems Engineering – Tools That Work Together

Because we design and manufacture the entire BHA – from bit to MWD to motor to jars to stabilizers – our tools are optimized to work together. The MWD toolface offset aligns with the mud motor scribe line. The stabilizer spacing is calculated for your specific BHA dynamics. Everything fits. Everything communicates. Everything is documented in one set of manuals.

📋 Full API and ISO Certification

• API Q1, API 7, API 7‑1, API 7‑2

• ISO 9001, ISO 14001, OHSAS 18001

• GOST certification available for Russian/Eurasian markets

• Third‑party inspection (DNV, BV, ABS) welcome

🌍 Global Export Track Record

Our downhole tools have been exported to Russia, Kazakhstan, the United States, Canada, the Middle East, and South America. We understand export documentation, logistics, and field support across international borders.

🔄 Lifecycle Support – From Selection to Fishing

We do not just sell tools. We help you select the right tool for your formation and well plan. We provide spares and maintenance training. And when things go wrong, our fishing tool classification gives you the right equipment to retrieve the BHA.

Frequently Asked Questions (FAQ)

Q1: Why do I need a classification system for downhole tools?

A: Downhole tools serve very different functions. A classification system helps drilling engineers and procurement teams quickly identify the correct tool for a specific downhole condition – for example, whether you need a hydraulic jar vs. mechanical jar, or a spiral vs. straight blade stabilizer. It also helps organize your inventory and maintenance schedules.

Q2: Are Kingdream downhole tools compatible with tools from other manufacturers?

A: Yes. All our tools are manufactured to API 7‑1 and 7‑2 dimensional standards. You can run a Kingdream mud motor with a third‑party PDC bit, or a Kingdream MWD tool inside a non‑magnetic drill collar from another supplier. Connection types (NC, REG, IF) match industry standard thread forms.

Q3: Do you provide engineering support for BHA design?

A: Yes. Our application engineers can help you design the optimal bottom hole assembly based on your well trajectory, formation data, and drilling parameters. We use BHA modeling software to predict buckling, vibration, and torque/drag. This service is free for qualified projects.

Q4: What is the typical lead time for downhole tools?

A: Lead time varies by tool category and customization level:

• Drill bits (PDC, roller cone): 4–6 weeks for standard sizes, 8–10 weeks for custom designs

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

• MWD tools: 8–12 weeks

• Jars, stabilizers, NMDCs: 6–8 weeks

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

Contact us for current stock availability and expedite options.

Q5: Do you offer rental or trial programs for downhole tools?

A: Yes. For qualified operators and drilling contractors, we offer rental programs for mud motors, MWD tools, and fishing tools. Trial runs of new bit designs or motor configurations can be arranged with performance-based terms. Contact our sales team for details.

Q6: How do I know which type of mud motor (lobe configuration) I need?

A: The choice depends on your required torque and speed at the bit. Low‑speed high‑torque (1:2, 3:4) motors are used for PDC bits in hard formations and extended laterals. High‑speed low‑torque (5:6, 7:8) motors are used for roller cone bits and softer formations. We provide a selection guide and can recommend based on your mud flow rate and bit size.

Q7: What is the difference between a hydraulic jar and a mechanical jar?

A: A hydraulic jar delays the impact – the jar strokes after maintaining overpull or overtorque for a set time (usually 30–90 seconds). This allows you to work the string before the jar fires. A mechanical jar fires immediately when the preset load is reached. Hydraulic jars are more common for deep wells; mechanical jars are simpler but require precise load setting.

Q8: Do you manufacture fishing tools for specific fish shapes?

A: Yes. We supply custom‑designed overshots and spears for non‑standard fish (e.g., damaged collars, irregular shapes). Provide us with a sketch or sample, and our engineering team will design and manufacture the tool. Standard fishing tools are stocked for common fish sizes (2″ to 10″ OD).