Drilling and completion tools maintenance

Technical Specifications – Maintenance Service Capabilities

The following table outlines our maintenance standards and testing capabilities. All services are performed to API or OEM specifications.

Service Category	Capability / Standard	Testing / Verification
PDC bit refurbishment	Cutter replacement, profile contouring, nozzle reaming	Dull grading (IADC), flow bench test
Roller cone bit refurbishment	Bearing replacement, tooth/insert repair, seal replacement	Pressure test, rotation test (up to 300 RPM)
Mud motor overhaul	Stator re‑rubbering, rotor chrome plating, bearing replacement	Hydraulic dyno – torque, speed, differential pressure
Drilling jar service	Seal replacement, fluid recharge, latch mechanism adjustment	Overpull/torque calibration, stroke timing verification
Stabilizer repair	Hardfacing replacement, body straightening, thread repair	Dimensional inspection (API 7‑1), MPI crack check
NMDC service	Thread repair, hardbanding, body straightening	Permeability (μ ≤ 1.005), ultrasonic wall thickness
MWD tool calibration	Accelerometer/magnetometer calibration, pressure housing testing	Inclination (±0.1°), azimuth (±1.0°), pressure test to 140 MPa
Completion tool service	Seal replacement, flow test, function testing (packer setting)	Pressure test to rated working pressure
Non‑destructive testing (NDT)	MPI, dye penetrant, ultrasonic (UT), eddy current	API 7‑2 / ASNT Level II certified inspectors
Thread inspection	Go/no‑go gauges, visual (ID/OD), pitch diameter measurement	API 7‑2 thread class
Pressure testing	Hydrostatic or gas (depending on tool)	Up to 140 MPa (20,000 psi)
OEM documentation	Repair report, test certificate, remaining life estimate	Traceable to original manufacturing records

Product Types – Maintenance Packages

We offer maintenance services as individual repairs or contract packages. Choose the level that fits your operation.

1. Single‑Tool Repair Service (Pay as You Go)

• Send us your worn or damaged tool

• We inspect, quote, repair (with your approval), and ship back

• Lead time: 2–4 weeks depending on repair scope

• Best for: Small operators, occasional tool use, emergency repairs

2. Preventive Maintenance Contract (Most Popular)

• Scheduled inspections based on tool running hours or runs

• We pull tools from your inventory, service them, and return to stock

• CMMS tracking and automated service alerts

• Fixed monthly or per‑tool fee

• Best for: Operators with 5+ rigs, high tool utilization

3. On‑Site Mobile Service (Remote Campaigns)

• Deploy our containerized workshop to your pad or platform

• Dedicated technician(s) on location for the duration of your campaign

• Maintenance performed between runs – no shipping delays

• Spare parts consigned on site

• Best for: Arctic, jungle, offshore, or any location far from service centers

4. Tool Rental + Maintenance Bundles

• Rent Kingdream downhole tools (bits, motors, jars, MWD)

• Maintenance included in rental rate

• Swap out worn tools for refurbished ones at field inventory points

• Best for: Operators who prefer not to own capital tools

5. Training and Certification (For Your Crew)

• On‑site training for your maintenance technicians

• Topics: Dull grading, thread inspection, motor assembly, jar testing

• Certification exam and refresher courses

• Best for: Operators building internal maintenance capability

Application Fields – Where Our Maintenance Adds the Most Value

High‑Volume Shale and Tight Gas Pads

When you are drilling 30+ wells from a single pad, tool usage is intense. Our on‑site mobile service keeps bits and motors turning between wells. No shipping tools to a distant repair center – we service them on the pad while the rig skids to the next location. Operators report 20–30% reduction in tool‑related downtime with this model.

Offshore Platform Drilling

Offshore logistics are expensive and slow. Flying tools to a shore‑based repair center costs days and thousands in helicopter time. Our offshore maintenance program includes platform‑based technicians and spare parts inventories – we service BOPs, mud motors, and MWD tools on the platform, reducing non‑productive time.

Arctic and Remote Land Drilling (Siberia, Northern Canada)

Winter weather windows are short. You cannot afford to ship tools south for repair and wait for the next barge or ice road. Our mobile service units are winterized to -45°C and stationed near your field. We perform maintenance in heated workshops on site, keeping your tools in the field for the entire drilling season.

Deep and High‑Pressure Wells

Tools that come out of deep, high‑pressure wells need meticulous inspection – HP/HT conditions accelerate wear and fatigue. Our NDT and pressure testing capabilities are certified to HP/HT standards (150°C+, 20,000 psi). We identify micro‑cracks and material fatigue before they cause downhole failures.

Workover and Re‑Entry Campaigns

Workover tools (jars, fishing tools, milling tools) are often used intermittently and stored for months between campaigns. Our pre‑campaign inspection service ensures every tool is ready before you mobilize – thread inspection, function testing, and documentation. No last‑minute surprises.

Why Choose SJ Petro / Kingdream for Tool Maintenance?

OEM Knowledge – We Built the Tools

We are not a third‑party repair shop guessing at tolerances. Kingdream manufactures the tools. Our maintenance technicians have access to original engineering drawings, material certifications, and assembly procedures. When we repair a Kingdream mud motor, it comes back as close to new as physically possible.

API and ISO Certified Service Center

Our maintenance facilities are certified to:

• API Q1 (Quality management)

• API 7‑2 (Threading and gauging)

• ISO 9001, ISO 14001, OHSAS 18001

• ASNT Level II/III NDT personnel

We are audited annually. You can trust our inspection and repair records.

Field‑Proven – Thousands of Tools Serviced Annually

Kingdream’s maintenance centers service thousands of downhole tools every year for CNPC, Sinopec, CNOOC, and international customers. Our repair data feeds back into our manufacturing engineering – we know which components wear fastest and have updated our designs accordingly.

Transparent Reporting – Full Traceability

Every tool we service gets a digital file in our CMMS. You can log in and see:

• Original manufacturing date and specifications

• Every repair event (date, work performed, parts replaced)

• Test results (pressure, torque, calibration)

• Remaining life estimate and next scheduled maintenance

No more "we think it’s okay.” You have the data.

Global Service Footprint

We operate maintenance centers in:

• Jingzhou, China – Main facility (OEM service)

• Kazakhstan – Serving Central Asian oilfields

• Middle East (Dubai) – Support for GCC and Iraq

• Russia (Moscow) – Local‑language service, GOST documentation

• Mobile units – Deployable worldwide

We are expanding. If you have a concentration of Kingdream tools in your region, we can establish a local service point.

Frequently Asked Questions (FAQ)

Q1: How often should I service my downhole tools?

A: It depends on the tool type and usage conditions. General guidelines:

• PDC bits: After every run (inspect; re‑tip every 2–3 runs depending on wear)

• Mud motors: Every 200–300 rotating hours or after every long lateral run

• Drilling jars: Every 6 months or after every firing event

• NMDCs: Thread inspection every 12 months or after any high‑torque event

• MWD tools: After every run (pressure test, sensor calibration every 2–3 runs)

Our CMMS can track your tool usage and send automated service reminders.

Q2: Can you maintain tools that are not from Kingdream?

A: Yes. We maintain downhole tools from all major manufacturers (Baker Hughes, Schlumberger, NOV, Halliburton, etc.) as long as we have access to OEM specifications or API standards. For tools where we lack specifications, we recommend returning to the original manufacturer. We are transparent about this.

Q3: How much does tool maintenance cost compared to buying new?

A: Maintenance typically costs 40–60% of new tool price, depending on the extent of wear. For example:

• Re‑tipping a PDC bit: 40–50% of new bit cost, restores 85–95% of original performance

• Stator re‑rubbering: 50–60% of new motor cost, full performance restoration

• NMDC thread repair: 30–40% of new collar cost

The cost–benefit improves with high‑utilization tools. We provide a repair vs. replace analysis before any work.

Q4: What is the turnaround time for a typical repair?

A: Standard lead times from receipt at our Jingzhou facility:

• PDC bit re‑tip: 10–14 working days

• Mud motor stator re‑rubber: 15–20 working days

• Drilling jar service: 7–10 working days

• NMDC thread repair: 10–14 working days

• MWD calibration: 5–7 working days

Expedite service (50% surcharge) reduces lead times by 40–50%. On‑site mobile service eliminates shipping time entirely.

Q5: Do you offer warranty on repaired tools?

A: Yes. All repairs are warrantied for:

• 90 days or one run, whichever comes first (standard)

• 180 days or two runs (extended warranty, additional cost)

The warranty covers workmanship and replaced components. It does not cover damage from misuse, deviation from recommended operating parameters, or fishing tool damage.

Q6: How do I send tools to your maintenance center?

A: Contact our service desk for a return merchandise authorization (RMA). We provide:

• Shipping instructions (including dangerous goods documentation for batteries and pressure housings)

• Packing checklist

• Blank inspection request form

We can also arrange freight pickup for large shipments (additional cost).

Q7: Do you provide certification for repaired NMDCs and BHA components?

A: Yes. We provide a certificate of repair that includes:

• Pre‑repair inspection results (NDT, dimensional)

• Work performed (thread repair, hardbanding, straightening)

• Post‑repair dimensional inspection (with API 7‑2 thread class)

• Magnetic permeability test results (NMDCs only)

• Final pressure test results (if applicable)

The certificate is signed by our QC manager and traceable to our API Q1 system.

Q8: Can you set up a consigned spare parts inventory near my operation?

A: Yes. For operators with long‑term contracts, we can consign critical spare parts (cutters, stators, bearings, seals, nozzles) at your warehouse or rig site. You pay only when you use the part. We monitor inventory levels and restock automatically. This eliminates your upfront spare parts capital and ensures parts availability.