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Instrumentation & Control
Parameter Recorders
Parameter recorders keep a time-based record of drilling, cementing and pressure test data. The category covers multi-pen mechanical drilling recorders, hydraulic chart pressure recorders and electronic drilling recorders (EDR) with their sensors, servers and rig displays. A recorder holds the evidence for well records and incident reviews, so its clock, calibration and data ownership matter as much as its condition.
Operating principle
A mechanical drilling recorder draws several parameters on a strip or circular chart driven by a clock. Pens move with hydraulic or mechanical inputs such as hookload, pump pressure and rotary torque, and one channel usually marks penetration. A hydraulic pressure recorder uses a pressure element, such as a Bourdon tube or helical coil, to move a pen across a circular chart. Crews use them on cementing jobs, BOP and casing pressure tests, and well tests.
An electronic drilling recorder collects sensor data, stores it at a fixed sampling rate, shows it on rig displays and sends it ashore. Pason's EDR is one widely used example.
Configurations
| Type | Record | Typical use |
|---|---|---|
| Mechanical multi-pen recorder | Paper strip or circular chart | Backup to electronics, smaller rigs |
| Hydraulic pressure recorder | Circular chart per test | Pressure tests and cementing |
| Electronic drilling recorder | Digital database, sent ashore | Primary rig record, remote monitoring |
Key specifications
| Parameter | Why it matters | Typical classes or units |
|---|---|---|
| Channels or pens | Sets how many parameters you record | Number of pens or inputs |
| Chart duration | Sets chart change interval | Hours or days per chart |
| Element range | Must suit the test pressure | psi or bar per element |
| Data protocol | Must reach the operator's systems | WITS, WITSML, Modbus |
| Sampling rate | Decides what fast events you capture | Samples per second |
Data standards
WITS is the older Wellsite Information Transfer Specification. Its simple form sends ASCII records over a serial link. WITSML, an Energistics standard, exchanges well data as structured objects between rig and office. Version 1.4 is still widely used, while version 2.0 runs over the Energistics Transfer Protocol. Check which version your operator's systems expect before you buy a used EDR server.
Standards and certification
Recorders on the drill floor need Ex protection for their zone, and electronic sensors need ATEX or IECEx certificates. Pressure elements should be calibrated against a dead-weight tester or a reference traceable to national standards. Where a pressure chart documents a BOP or casing test, the operator and regulator expect the calibration certificate to be current on the day of the test.
Failure modes and inspection
- Clock drives that run slow, so chart time no longer matches events.
- Worn pen arms and linkages, sticking pens and dry ink.
- Pressure elements that lose span or zero after an overpressure.
- Hard disk and power supply failures in EDR servers.
- Unsupported operating systems on rig computers.
Check each pressure element against a dead-weight tester across its range, run the clock against a reference, and power up electronic units to confirm data logging and export.
Documentation
Ask for a calibration certificate for each pressure element, spare chart stock or a supplier for the charts, and for electronic recorders the software version, licence terms and data service contract. Old charts belong to the well record and the operator, so they stay with the previous user.
Integration and compatibility
Mechanical recorders need hydraulic or mechanical inputs that match your sensors. Electronic recorders depend on the supplier's sensors, software and data service. Some EDRs are supplied as a rental or service, so used hardware may not run without a contract.
Refurbishment and when used makes sense
Mechanical chart recorders make sound spares, because they run without networks or software. A recorder overhaul cleans and adjusts the clock, replaces pens and linkages and recalibrates every element. Unused surplus pressure elements are worth holding for test recorders. A used EDR is only worth buying for a rig on the same system, with the supplier's agreement.
Related equipment
For the sensors that feed a recorder, see drilling instrumentation, and for test packages see well test equipment. Naventr can pass your questions on recorder condition to the Seller.
FAQ
Frequently asked questions
What is a multi-pen drilling recorder?
A multi-pen drilling recorder draws several drilling parameters on one clock-driven chart. Common channels are penetration, hookload, pump pressure and rotary torque. Rigs keep them as a backup to electronic recording, because they work without networks or software.
Can I buy a used electronic drilling recorder outright?
Sometimes, but many electronic drilling recorders are supplied as a rental or service. The hardware may belong to the supplier and need its software and data service. Confirm ownership, licences and service terms with both the Seller and the supplier.
How do you check a used chart pressure recorder?
Compare each pressure element against a dead-weight tester or a calibrated reference across its full range. Check that the clock keeps time over a full chart rotation, and inspect pen arms and linkages for wear. Ask for the last calibration certificate too.
What is the difference between WITS and WITSML?
WITS is an older specification that sends simple records, often as ASCII over a serial link. WITSML is the Energistics standard that exchanges structured well data objects between rig and office systems. Most modern data systems use WITSML.
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