Cementing maintenance

Technical Specifications – Cementing Equipment Maintenance Parameters

The tables below present our cementing maintenance service scope and performance specifications.

Cementing Head Maintenance Specifications

Maintenance Task	Inspection Method	Acceptance Criteria	Recertification Interval
External visual	Dye penetrant, MPI	No cracks, no severe corrosion	Every job (pre‑use)
Thread inspection	API master gauges	No galling, stripping, or wear beyond 5%	Every job
Metal seal surfaces	Visual + profilometer	No nicks, gouges >0.010″	Every job
Elastomeric seals	Visual + compression set test	No cuts, swelling, or permanent deformation	Replace annually or after 10 jobs
Valve function (ball/plug)	Manual cycling with pressure	Smooth operation, no leakage at rated pressure	Every job
Plug release mechanism	Functional test with dummy plug	Reliable release, indicator flag visible	Before each use
Hydrostatic shell test	Water, 1.5× WP, 15 min hold	No pressure drop, no visible leakage	Annually or after repair
Pressure rating verification	Stamp inspection	Legible rating (3K, 5K, 10K, 15K PSI)	Annually

Float Equipment Maintenance Specifications (Per API 10F / ISO 10427‑3)

Parameter	Float Shoe	Float Collar	Acceptance Criteria
Back‑pressure valve test	Forward flow: unrestricted	Check valve fully open	Pressure drop <5%
Reverse flow test	Press from below	Check valve closed	Zero leakage @ differential pressure
Hydrostatic body test	1.5× WP	1.5× WP	No leakage, no body deformation
Thread connection	Box thread (casing)	Pin + box	API thread gauge passes, no damage
Cement port obstruction check	Visual + drift test	Visual + drift test	Full port opening, no debris
Temperature rating verification	Stamp or cert	Stamp or cert	Match job BHST

Cementing Plug Maintenance Specifications

Parameter	Inspection Method	Acceptance Criteria	Replacement Schedule
Body (polyurethane/rubber)	Visual	No cuts, tears, swelling, or ozone cracking	Replace when damaged or after 2 years
Rubber cups	Visual + durometer	Durometer within spec (±5 Shore A)	Replace when worn >15%
Anti‑rotation mechanism	Functional test	Smooth engagement/disengagement	Inspect every 5 jobs
Thread protectors	Visual	In place, undamaged	Replace as needed
Storage condition	Environmental check	Clean, dry, horizontal rack, no UV exposure	Continuous
Drift test	Through simulated casing section	Smooth passage without binding	Before each use

Cementing Plunger Pump Maintenance Specifications

Component	Maintenance Task	Wear Limit	Replacement Criteria
Valve seat	Visual + lapping	Surface wear <0.010″	Pitting or >0.010″ wear
Valve disc	Visual	No cracks, erosion depth <0.020″	Cracked or eroded through
Plunger	Dimensional + surface finish	O.D. wear <0.005″ from new	Chrome worn through or out of round
Packing	Visual + leakage test	Leakage <10 drops/min	Leakage excessive or after 500 hours
O‑rings and backup rings	Visual	No cuts, flattening, or extrusion	Replace at every valve service
Threads (seat retainer)	Visual + torque check	No galling, torque within spec ±5%	Damaged threads = replace retainer

Service Types – Cementing Maintenance Programs

We offer several cementing maintenance service levels to match your operational needs and budget:

1. Pre‑Job Field Inspection – A technician visits your wellsite before the cementing job to inspect the cement head, plugs, float equipment, and surface lines. Minor repairs (seal replacement, thread dressing) performed on site. Includes a written inspection report.

2. Preventive Maintenance (Annual or Semi‑Annual) – Scheduled overhaul of cementing equipment in our workshop. Full disassembly, cleaning, NDT of pressure bodies, seal and wear part replacement, hydrostatic testing, and recertification. Equipment returned with new data plate and test certificates.

3. Corrective / Emergency Repair – 24/7 call‑out for equipment failure. Technician mobilizes with a pre‑packed spares kit for your equipment model. For major failures, we arrange component exchange.

4. Component Exchange Program – We keep a stock of refurbished, recertified cementing heads, float shoes/collars, and pump valve assemblies. You receive a refurbished unit within 24‑48 hours and return your core within 30 days. Downtime reduced from weeks to hours.

5. Fleet Maintenance Contract – For operators with multiple cementing units or large tool inventories, we provide scheduled maintenance for your entire fleet. Fixed monthly or annual fee. Includes emergency response, spare parts, and quarterly reporting.

6. Recertification for Regulatory Compliance – Many jurisdictions require API‑compliant documentation for cementing equipment. We perform full recertification (visual, NDT, pressure test, function test) and provide a certificate suitable for submission to regulators, ABS, DNV, or BV.

7. Cementing Plug Storage & Rotation Service – We maintain your cementing plug inventory in our climate‑controlled warehouse. Plugs are inspected before dispatch, rotated on a first‑in, first‑out basis, and recertified annually. You pay only for plugs you use.

Applications – Where Our Cementing Maintenance Is Deployed

Our cementing maintenance services are used in:

• Primary cementing operations – Surface casing, intermediate casing, and production casing. Pre‑job inspection of cement heads and float equipment ensures reliable plug release and back‑pressure valve integrity.

• Remedial cementing / squeeze jobs – Equipment that sits for long periods between uses requires thorough inspection before mobilization. We service cementing units and downhole tools for squeeze and block squeeze operations.

• Plug and abandonment (P&A) – Aging wells require certified cementing equipment for permanent abandonment. Our recertification services meet regulatory requirements for P&A work.

• Offshore platform cementing – Compact cement heads and space‑constrained equipment require specialized maintenance. Our technicians hold offshore survival certification and can perform on‑platform maintenance.

• Arctic / low‑temperature cementing – Cold‑weather maintenance programs ensure seals, valves, and hydraulic systems function at -45°C. Heated storage for plugs during transport.

• Deepwater / HP/HT cementing – High‑pressure (15,000 PSI) cement heads and float equipment undergo rigorous hydrostatic and temperature‑cycling tests before deployment.

• Rental fleet recertification – Tool rental companies rely on our annual recertification services to maintain API compliance for their cementing equipment fleet.

Why Choose SJ Petro for Cementing Maintenance?

• OEM engineering knowledge – We built much of this equipment. Our engineers have original drawings, material specs, and heat‑treat recipes. When we repair a cement head, we follow the manufacturer’s specifications — not "close enough.”

• API SC 10 compliance – Our inspection and testing procedures align with API Spec 10D (bow‑spring centralizers), API 10F (cementing float equipment), and related technical reports on cement plugs and stage collars. Your regulatory compliance is covered.

• Mobile field service – Our fully equipped service trucks carry common spare parts (seals, valve kits, plug components), NDT equipment (MPI, UT), and test gauges. We come to you — even to remote well sites.

• Exchange program reduces downtime – Instead of waiting 4‑6 weeks for a cement head overhaul, you get a refurbished unit in 24‑48 hours. Send your core back at your convenience.

• Climate‑controlled plug storage – Cementing plugs are stored in our clean, dry, temperature‑controlled warehouse. No UV damage, no humidity swelling, no ozone cracking. Plugs arrive at your wellsite in as‑new condition.

• Full documentation – Every maintenance job comes with a digital report: inspection findings, measurements, replaced parts list, test certificates (hydrostatic, function), and recertification sticker. Audit‑ready.

• 24/7 emergency hotline – A real engineer answers, not a call center. We dispatch a technician with a spares kit within hours of your call.

• Competitive pricing – As an OEM manufacturer, we are 20‑30% below third‑party repair shops for equivalent API‑certified maintenance work.

• Warranty – 12 months on all maintenance work and replaced components (excluding consumables like seals and packing).

Frequently Asked Questions (FAQ)

Q1: What is the most common cause of cementing equipment failure?
Worn or damaged seals on cement heads and float valves, followed by improper storage of cementing plugs (leading to rubber degradation). Our pre‑job inspection catches these issues before they cause a failure.

Q2: How often should cementing heads be recertified?
API does not specify a fixed interval, but industry best practice is: annual full recertification (hydrostatic test, NDT, seal replacement) and pre‑job visual inspection before every cementing job. Some regulators require annual recertification for critical wells.

Q3: Can you service cementing equipment from other manufacturers (e.g., Halliburton, Schlumberger, Weatherford)?
Yes. We maintain reverse‑engineered drawings and seal cross‑references for most common cementing head models. Send us the model number and photos. We can usually identify the repair parts needed within 24 hours.

Q4: What is included in a pre‑job field inspection of a cementing head?
Visual inspection for cracks, dents, and corrosion; thread inspection with API gauges; metal seal surface check; elastomeric seal condition; valve function test; plug release mechanism test; and pressure rating verification. We provide a signed inspection report for your records.

Q5: How should cementing plugs be stored between jobs?
In a clean, dry environment, protected from weather extremes. Plugs should be stored horizontally on racks or in protective containers to prevent deformation. Thread protectors and protective caps must remain in place. Avoid direct sunlight (UV damages rubber) and high humidity (causes swelling).

Q6: Do you provide on‑site maintenance for offshore platforms?
Yes. Our technicians hold BOSIET, HUET, and CA‑EBS offshore survival certification. We perform cement head and float equipment maintenance directly on the platform, including NDT, seal replacement, and function testing.

Q7: What is the turnaround time for a cement head overhaul?
Standard overhaul: 10‑15 business days (receipt to shipment) for most models. Expedited service (5‑7 days) available for an additional fee. Our exchange program delivers a refurbished unit in 24‑48 hours.

Q8: Do you offer exchange program for float shoes and collars?
Yes. We stock refurbished float equipment in common sizes (4‑1/2" to 20"). You receive a recertified unit and return your core within 30 days. No waiting for manufacturing lead times.

Q9: What documentation do you provide after recertification?
You receive: incoming inspection report (including photos of wear), repair log, dimensional report, NDT report, hydrostatic test certificate, function test certificate, and a new recertification sticker. All documents are digital and searchable.