Fracturing maintenance

Technical Specifications – Maintenance Services & Intervals

Recommended Preventive Maintenance Schedule (QPA2500 / SCF5000 / SCF8000)

Component	Inspection Frequency	Replacement Interval (Typical)	Critical Signs
Packing (plunger seals)	Daily visual	200–400 hours (abrasive sand) / 500–800 hours (clean fluid)	Leakage >10 drops/min, visible fluid spray
Valves & seats	Weekly (or after each stage)	300–600 hours (sand) / 800–1,200 hours (clean)	Loss of rate/pressure, unusual knocking sound
Plungers	Weekly (visual + gauge)	600–1,000 hours (depending on fluid abrasiveness)	Grooving >0.010″, chrome wear exposing base metal
Suction/discharge valve springs	At each valve replacement	Same as valves	Weak spring – slow valve closing
Fluid end fasteners (studs/nuts)	Each disassembly	3–5 removals (replace)	Stretch, corrosion, thread damage
Fluid end body	Annual (NDT)	8,000–15,000 hours (depending on pressure cycles)	Cracks detected by MPI or dye penetrant
Power end bearings	5,000 hours (inspection)	10,000–15,000 hours	Unusual noise, high oil temperature, metal in oil
Engine / transmission	Per engine manufacturer	Per OEM schedule	N/A

Fluid End Service Kits (OEM)

Kit Type	Includes	Application	Part Number
Valve & Seat Kit (standard)	5 tungsten carbide valves + 5 seats + 10 O‑rings	QPA2500, 105 MPa	SK‑QPA2500‑VS
Valve & Seat Kit (high pressure)	5 premium valves + seats, 175 MPa rated	SCF8000	SK‑SCF8000‑VS
Packing Kit	5 sets of plunger packing (V‑stack or chevron) + lubricant	All QPA/SCF pumps	SK‑QPA‑PKG
Plunger	Single plunger, hard chrome plated, your size	QPA2500 (4.0″, 4.5″, 5.0″, 5.5″)	PL‑QPA‑[size]
Complete Fluid End Overhaul Kit	Valves + seats + packing + plungers + springs + gaskets + fasteners	Full fluid end rebuild	SK‑QPA‑FULL
Power End Bearing Kit	Main bearings + rod bearings + seals + gaskets	QPA2500 power end overhaul	SK‑QPA‑PE

Product Types – Fracturing Maintenance Services

We organize our maintenance offerings into service packages. Choose what fits your operation.

1. Scheduled Preventive Maintenance (SPM) Contract

Best for: Operators with a regular fracturing schedule (weekly or monthly jobs)

What’s included:

• Quarterly on‑site inspection of all pumps (valve condition, packing wear, plunger measurement)

• Oil sampling and analysis (power end, transmission, engine)

• SOFElink remote monitoring with automated alerts

• Priority access to spare parts

• Fixed annual fee + discounted labor for repairs

Typical cost: $XX,XXX per year (depending on fleet size). Contact for quote.

2. On‑Call Field Repair Service

Best for: Operators who prefer pay‑as‑you‑go maintenance

What’s included:

• 24/7 dispatch to your wellsite (within region)

• Mobile service truck with common spares and tools

• Labor billed hourly + parts at published price list

• Travel time billed for locations beyond service center radius

Typical response time: 4–12 hours (within same region). For remote international locations, we coordinate with local partners.

3. Fluid End Exchange Program

Best for: Operators who cannot afford days of downtime for fluid end overhaul

How it works:

1. You order a remanufactured fluid end (exchange core)

2. We ship it to your location (air freight available)

3. Your crew swaps the fluid end in 4–6 hours

4. You ship your worn fluid end back to us for credit

Turnaround (exchange program): You receive the replacement before you even remove the old one – zero downtime beyond the swap.

4. Power End Overhaul & Exchange

Same concept as fluid end exchange, but for the lower end of the pump. We maintain a stock of rebuilt power ends (QPA2500, SCF5000). Exchange turnkey service includes shipping both ways.

5. Spare Parts Supply (OEM & Compatible)

We stock a full inventory of wear parts and major components:

• Valves and seats (tungsten carbide, ceramic, Stellite)

• Packing sets (various materials for different fluids)

• Plungers (hard chrome, stainless steel, ceramic coated)

• Seal kits for fluid end and power end

• Fasteners (studs, nuts, washers – grade 8 or higher)

• Bearings (crankshaft, connecting rod)

• Gaskets and O‑rings (viton, PTFE, NBR)

All parts ship from our central warehouse within 24 hours (express delivery available).

6. Training & Technical Support

Best for: Operators who want to build in‑house maintenance capability

What’s included:

• On‑site training: fluid end overhaul, valve replacement, packing change, troubleshooting

• Classroom training: pump theory, failure analysis, preventive maintenance planning

• Digital manuals and video library

• Remote diagnostic support (video call with our engineers)

Typical training duration: 3–5 days for crew, 1–2 weeks for maintenance leads.

Applications – Where Our Maintenance Services Are Used

Our fracturing maintenance services support all types of stimulation operations:

• Shale gas multi‑stage fracturing – high sand volumes require frequent valve and packing changes. Our on‑site teams keep pumps running between stages.

• Tight gas / conventional fracturing – preventive maintenance between jobs, fluid end overhauls during off‑seasons.

• Coiled tubing fracturing – smaller pumps (500–1,500 HP) – we supply parts and repair services for all makes.

• Acidizing operations – specialized seals and corrosion‑resistant parts; we stock Hastelloy and Inconel components.

• Offshore fracturing – we offer corrosion‑protected parts and certified technicians for platform maintenance.

• International operations – our parts and remote support reach any location. For major fleets, we can station a full‑time technician on site.

Why Choose SJ Petro for Fracturing Maintenance?

Because we built the pump. Because we know where they fail. Because we have the parts and the people to fix them faster than anyone else.

Your Maintenance Pain Point	SJ Petro’s Answer
"We keep buying 'OEM’ parts online, but they fail in 200 hours.”	Counterfeit and low‑grade parts are rampant. We sell genuine OEM parts direct – no middlemen, no fakes.
"Our local shop takes 3 weeks to rebuild a fluid end.”	Our exchange program gets you a rebuilt fluid end in 24 hours (air freight). Your downtime is just the swap – 4–6 hours.
"We run Halliburton pumps. Can you help?”	Yes. We manufacture high‑quality aftermarket parts for most major brands – often at 30–50% less than OEM.
"We don’t have a maintenance team on site. Failures kill our schedule.”	Our field service teams can be dispatched to your wellsite. We’ll also train your crew so they can handle basic repairs themselves.
"We wish we could predict failures before they happen.”	SOFElink predictive monitoring gives you alerts on valve wear, packing leaks, and bearing issues – before they cause a shutdown.

More reasons fracturing operators trust SJ Petro maintenance:

• OEM manufacturer – We built the pumps. We have the original engineering data, the exact material specs, and the test procedures.

• Global parts inventory – Over $5M in spare parts stocked at our main warehouse. Regional hubs in major oilfield areas.

• 24/7 technical hotline – Call our engineers anytime, anywhere. Video support included.

• Service centers – Full overhaul facilities in Jingzhou, Chengdu, and Xinjiang (China). Expanding to Middle East and Russia.

• Competitive pricing – OEM quality at 20–40% below North American brands.

• Fast turnarounds – Standard fluid end overhaul: 2 days (including test). Power end overhaul: 10 days.

Frequently Asked Questions (FAQ) – Fracturing Maintenance

Q1: Do I need OEM parts, or can I use cheaper aftermarket parts?

A: You can use aftermarket parts – but be very careful about quality. We’ve seen "cheap” valves that failed in under 100 hours, causing damage to the fluid end body. Our aftermarket parts (for non‑SJ Petro pumps) are manufactured to our high standards, with proper heat treatment and hardfacing. We recommend using OEM parts for critical components (valves, seats, plungers) and aftermarket for less critical ones (gaskets, seals). If you’re unsure, ask us – we’ll give you honest advice.

Q2: How do I know when to replace valves and seats?

A: Signs of valve/seat wear:

• Pressure drop at the same pump speed

• Unusual knocking or hammering sound from the fluid end

• Loss of rate (you need higher pump speed to maintain the same flow)

• Irregular pressure trace on the data van (spikes and valleys instead of smooth curves)

With SOFElink monitoring, the system will alert you when valve impact energy exceeds a threshold. Without monitoring, inspect valves every 200–300 pumping hours in abrasive service.

Q3: What’s the typical packing life in sand fracturing?

A: In high sand concentration (5–10 ppg), packing typically lasts 200–400 hours before leakage becomes excessive. In clean fluid (no proppant), packing can last 800+ hours. You’ll know it’s time to replace when you see fluid leaking past the plunger at a rate of more than 10–15 drops per minute at full pressure.

Q4: Can your field service team come to our wellsite anywhere in the world?

A: We have full‑time service teams in China’s major oilfield regions. For international locations (Russia, Middle East, Americas, Africa, Southeast Asia), we work on a case‑by‑case basis:

• If you have a large fleet (10+ pumps), we can station a full‑time technician at your location.

• For occasional needs, we dispatch a team (travel time and expenses billable).

• For emergency parts, we ship via DHL/FedEx to anywhere in 2–5 days.

We also train your local mechanics to handle most repairs – then we support them remotely.

Q5: What is the cost of a fluid end overhaul (labor + parts)?

A: Rough estimates (USD) for a QPA2500 fluid end:

Service	Parts	Labor	Total (approx)
Valve & seat replacement (all 5)	$800 – $1,500	$300 – $500	$1,100 – $2,000
Packing replacement (all 5)	$400 – $700	$200 – $400	$600 – $1,100
Complete fluid end overhaul (valves, seats, packing, plungers)	$2,500 – $4,000	$800 – $1,200	$3,300 – $5,200
Plunger replacement (each)	$200 – $400	$100 – $200	$300 – $600

Prices vary with material (tungsten carbide vs. Stellite vs. ceramic) and quantity. Volume discounts for fleet maintenance contracts.

Q6: How long does a power end overhaul take, and how much does it cost?

A: For a QPA2500 power end overhaul (bearings, seals, full inspection):

• Labor hours: 60–80 hours (skilled technicians)

• Parts cost: $3,000 – $6,000 (bearings, seals, gaskets, fasteners)

• Total typical cost: $6,000 – $10,000

• Turnaround: 2–3 weeks (if we have parts in stock)

We also offer exchange power ends – you send us your worn unit, we send you a rebuilt one. Exchange cost is approximately $5,000 – $8,000 plus shipping, with a core credit returned after we receive your old unit.

Q7: Do you offer maintenance for pumps from other manufacturers (Halliburton, NOV, Schlumberger, Weir, etc.)?

A: Yes. We service most major brands of fracturing pumps (triplex and quintuplex). We manufacture high‑quality aftermarket parts for these pumps – often at 30–50% below OEM prices. Our field technicians have experience on multiple brands. Just tell us the pump model and serial number, and we’ll quote accordingly.

Q8: What training do you provide for our own maintenance staff?

A: We offer three levels of training:

Training Level	Duration	Content	Best For
Operator maintenance	2 days	Daily checks, packing adjustment, valve inspection, basic troubleshooting	Rig crew
Fluid end specialist	5 days	Full valve/seat/packing replacement, plunger measurement, leak diagnosis	Maintenance leads
Master technician	10 days	Fluid end overhaul, power end bearing replacement, NDT inspection, pump alignment	Senior mechanics

Training can be done at your facility (our instructor travels to you) or at our factory in Jingzhou (you send your staff). Includes hands‑on practice on a live pump.

Q9: What is the lead time for spare parts?

A: Standard parts (valves, seats, packing, plungers) – in stock, ship within 24 hours (Monday–Friday). Express shipping (DHL/FedEx): 2–5 days to most international destinations. Less common parts (fluid end bodies, crankshafts): 2–4 weeks. We recommend maintaining a minimum stock of critical wear parts at your location.

Q10: How does SOFElink predictive maintenance work? Do I need to buy a new control system?

A: If you already have SOFElink on your pumps, the predictive maintenance features are included (no extra charge). The system monitors pump vibration, valve impact, temperature, and operating hours. It sends alerts when parameters exceed thresholds.

If you don’t have SOFElink, we can retrofit sensors to your existing pumps (even other brands). The retrofit kit includes vibration sensors, temperature probes, and a data gateway. Cost is approximately $5,000 – $10,000 per pump, including installation.