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Secure a cloud-connected drilling operation by treating every connection as an engineered operational pathway, not as an ordinary IT link. Build a complete OT inventory, map data flows, separate systems into zones and conduits, mediate all remote access through a controlled jump host, monitor for deviations from normal industrial traffic, and make patching and incident response fit the rig’s safety and availability requirements.
Controllers, safety systems, engineering workstations, historians, gateways, site networks and cloud services differ from one installation to another. The practices below are based primarily on cross-sector guidance from the U.S. Cybersecurity and Infrastructure Security Agency (CISA), including its October 1, 2024 release of Principles of Operational Technology Cybersecurity. They are not a drilling-specific security standard or an engineering procedure; validate every control against your process hazards, safety case, supplier support constraints and local law.
What security must protect in a connected drilling operation
In office IT, confidentiality is often the dominant concern. In drilling operational technology (OT), an unavailable or incorrectly controlled system can also stop a critical operation, damage equipment or create a process-safety event. A sound design therefore balances three outcomes:
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- Availability: Control, monitoring and communications must survive loss of a cloud service, a link, a device or a site network.
- Control and accountability: Operators must know what can change a process, who can make that change, and how to recover it.
Cloud services can provide useful functions such as fleet analytics, condition monitoring, centralized logging or remote expert support. They also create data flows and, in some designs, paths that can reach systems at the rig or installation. Give each flow a documented purpose, owner, destination, authentication method and failure behavior. A cloud connection that has no operational owner or defined fallback is an uncontrolled dependency.
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Start with an asset inventory and a data-flow map
You cannot secure what you cannot identify. Create one inventory for every installation and keep enough site-specific detail to distinguish a device on one rig from an apparently identical device on another.
Record the fields that affect risk
- Asset name, unique identifier, manufacturer and model.
- Function and process served, such as control, safety, supervision, data collection, engineering or communications.
- Operational criticality and the consequence of loss, delay, corruption or unauthorized change.
- Physical location, network segment, connected interfaces and communication protocols.
- Operating system, firmware, application version, support status and known end-of-life date.
- Owner responsible for operation, cybersecurity decisions and supplier coordination.
- Required inbound and outbound communications, including destinations, ports, schedules and bandwidth assumptions.
- Recovery information: known-good configuration, backup location, restoration sequence and the person authorized to restore it.
Include temporary equipment, vendor laptops, maintenance tools, wireless bridges, satellite or cellular gateways and devices brought aboard for a campaign. Record connections that are normally disabled as well as those that are always present.
Map flows, not just devices
Draw the path from a sensor or controller through supervisory systems, historians, gateways and site networks to any cloud endpoint. Add management, update, time-synchronization, authentication and logging flows. Mark where data crosses a trust boundary and what happens if that link fails. A one-way telemetry flow has a different risk from a channel that permits commands or configuration changes.
Use the map to answer a concrete question for every connection: What operational function requires this path, and what is the safest way to provide it? If nobody can answer, disable the path in a controlled change and verify that the process still operates as intended.
Classify the environment with zones and conduits
CISA’s 2025 joint OT asset-inventory guidance describes organizing assets by function or criticality and using the zones-and-conduits concept associated with ISA/IEC 62443. A zone groups assets with shared security requirements; a conduit is the constrained communication path between zones. This is a design method, not a claim that every rig should have the same number of segments.
Possible zones in a drilling environment
An installation might separate safety instrumented or emergency-shutdown functions, basic process control, supervisory and engineering workstations, historians and reporting, site services, and an external-services or cloud gateway zone. The actual arrangement depends on the equipment, process hazards and vendor architecture. Do not place a safety function in an internet-facing segment merely because it exchanges data with a cloud application.
Define conduits with explicit rules
For each conduit, specify the permitted source and destination, protocol, direction, authentication, time window and responsible owner. Deny everything else by default. Where a business or analytics system needs data, publish a carefully selected copy through a gateway or broker rather than extending the control network into the cloud. Keep command paths separate from telemetry paths whenever the process design allows it.
Segmentation is more than a firewall diagram. Test that routing, name resolution, remote administration and failover behave as documented. A rule that is technically present but bypassed by a modem, maintenance switch or unmanaged wireless device is not a real boundary.
Reduce exposure before adding controls
For every internet-facing or remotely reachable asset, document why the exposure is necessary. Remove unused public addresses, inbound port forwards, vendor accounts, legacy services and remote-management features. A controller should not be directly reachable from the public internet. If a device cannot be patched or securely managed, isolate it, restrict its communications to the minimum required and plan its replacement or compensating controls.
Minimum measures for a path that must remain
- Change default passwords before the system enters service. Use unique credentials and store them in an approved password-management process.
- Keep supported operating systems, applications and firmware patched according to a tested maintenance plan.
- Place remote sessions through a hardened jump host or equivalent access gateway in a controlled zone.
- Monitor both ingress and egress traffic, including connections initiated by the site toward external services.
- Use multifactor authentication (MFA) where the product and operating procedure support it. MFA is an additional control, not a substitute for segmentation, least privilege or monitoring.
- Disable unnecessary services and restrict administrative interfaces to the management path.
CISA’s ICS recommended practices include dedicated guidance on configuring and managing remote access. Treat that guidance as a starting point and verify that the resulting design preserves required response times and local operating capability.
Design remote access as a controlled operational procedure
Remote access should be justified, mediated, time-limited and observable. A permanent vendor tunnel or shared account makes it difficult to know who changed a setting and difficult to stop access during an incident.
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- Raise a work request. State the asset, purpose, requested commands or software, expected duration, operator in charge and rollback plan.
- Approve the operational risk. The control-system owner and the appropriate engineering or safety authority decide whether the work can occur in the proposed operating window.
- Prepare the path. Enable the jump host rule only for the approved source, destination and time. Confirm that backups, console access and a local operator are available.
- Authenticate individually. Use named accounts, MFA where supported and least-privilege roles. Do not share credentials between a contractor and the site team.
- Record the session. Capture authentication, commands or screen activity where technically and legally appropriate, along with network and system logs.
- Close and verify. Remove temporary rules, disable the account or certificate when the task ends, review changes with the local operator and perform a functional check.
If the cloud service fails, the site should retain a safe local mode. Define which controls continue without the link, how data queues or is discarded, and who can authorize a return to normal service.
Protect identities, configurations and engineering workstations
Account controls are effective only when they match the way OT is operated. Separate routine operator accounts from engineering and administrative accounts. Limit the ability to download logic, alter set points, change network rules or install software. Review membership at campaign changes, crew rotations and contractor off-boarding.
Engineering workstations deserve special treatment because they can alter controllers and safety-related configuration. Keep them in a restricted zone, allow software installation only through an approved process, and maintain offline or otherwise protected copies of known-good projects and device configurations. Verify backups by restoring them in a test environment or during an approved maintenance window; a backup that has never been restored is an assumption, not a recovery capability.
Monitor OT behavior, not just perimeter alerts
CISA’s OT monitoring material emphasizes asset discovery, expected-traffic baselines and detection of suspicious connections, configuration changes, unnecessary services and other indicators. Monitoring should understand the industrial protocols and operating patterns used at the site; a generic IT alert feed alone will miss important context.
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Build a baseline safely
Begin with passive collection where possible so discovery does not poll devices or interfere with timing-sensitive systems. Observe normal communications across a representative operating period that includes start-up, steady operation, maintenance and planned change. Document expected peers, protocols, rates, schedules and command types. Label the baseline with the operating mode; a connection normal during maintenance may be abnormal during drilling.
Alert on meaningful deviations
- A new asset, application, protocol or external destination.
- An unexpected connection between OT segments or from OT to an unapproved external network.
- Changes to controller logic, safety parameters, network rules or engineering files.
- Use of a previously unnecessary service, open port or administrative interface.
- Repeated authentication failures, unusual account use or a remote session outside its approved window.
- Traffic volume, timing or command sequences that differ materially from the established operating baseline.
Send high-value events to the team that can act on them. Retain timestamps synchronized well enough to reconstruct an event, protect logs from alteration and define retention periods with legal, contractual and investigation needs in mind. CISA also recommends considering threat-intelligence ingestion and common sharing formats; use them only when the site can validate relevance and avoid flooding operators with untriaged indicators.
Patch and change management must fit the process
There is no universal patch interval for drilling OT. Timing depends on the supported product, vendor validation, operational window, safety implications, connectivity and site procedures. Maintain a documented plan that distinguishes urgent security fixes from routine updates and identifies systems that cannot be patched in place.
A practical change workflow
- Identify the affected asset and the vulnerability or functional change.
- Check vendor support statements, dependencies, licensing and rollback options.
- Test in a representative environment or with a documented engineering review when a full test system is unavailable.
- Assess effects on control loops, alarms, historian data, safety functions, remote access and the loss-of-cloud operating mode.
- Schedule the work with the responsible operations and engineering authorities.
- Back up configurations and record pre-change values.
- Apply the change, validate function locally, inspect monitoring data and document the result.
When a legacy asset cannot be patched, use compensating controls such as stronger isolation, removal of unnecessary services, restricted removable media, tighter access windows and enhanced monitoring. Record the residual risk and a replacement target rather than treating the exception as permanent.
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An OT incident plan must describe safe operational actions, not only IT containment. Define who can place equipment in a safe state, who can authorize isolation, how to contact the control-system supplier and how to preserve evidence without disrupting a critical response.
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- Maintain current contact lists and escalation paths for operations, engineering, safety, cybersecurity, management and suppliers.
- Prepare decision trees for suspected unauthorized access, malicious configuration change, loss of a gateway, ransomware on an engineering workstation and unexplained process behavior.
- Keep tested local control and recovery procedures available when cloud services or wide-area links are unavailable.
- Predefine evidence to collect: access records, jump-host sessions, firewall logs, controller and engineering changes, configuration backups and relevant process alarms.
- Exercise the plan in a controlled setting, including a scenario in which remote access must be disabled while the rig continues safe operation.
Isolation should be deliberate. Disconnecting a network cable or powering off a device can remove an attacker but can also disable alarms, synchronization or a protective function. The person directing containment must understand those dependencies.
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CISA does not approve particular products. Select technology against the site’s protocols, deployment constraints and safety requirements. Use a proof-of-value or engineering validation process before broad deployment.
| Selection axis | Questions to answer |
|---|---|
| Collection method | Is discovery passive, active or hybrid? Could polling affect fragile or timing-sensitive devices? |
| Industrial protocol coverage | Can the system interpret the protocols and device types actually used on the installation, rather than only generic IP metadata? |
| Inventory quality | Does it identify firmware, roles, owners, dependencies and duplicate or stale records? |
| Behavior baselining | Can operators define normal traffic by operating mode and receive useful deviation alerts instead of excessive noise? |
| Remote-site deployment | Can sensors operate with limited bandwidth, intermittent links and strict change controls? What data remains available locally if the cloud is unreachable? |
| Response integration | Can events be exported to existing logging, ticketing and incident-response workflows with reliable timestamps? |
| Lifecycle and support | What is the update policy, support lifetime, offline operation, vulnerability-notification process and supplier escalation path? |
For a jump host or remote-access gateway, add session approval, time limits, named identities, MFA support, command or screen recording, emergency disablement and a local break-glass procedure to the evaluation.
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CISA’s October 1, 2024 OT cybersecurity principles are intended to help organizations recognize how business decisions can adversely affect OT cybersecurity and the risks attached to those decisions. Apply that idea to procurement, cost reduction, fleet standardization, cloud migration and maintenance scheduling. The person who accepts a change should have authority over its operational consequences.
ISA/IEC 62443 and NIST SP 800-82 are recognized OT references cited in CISA monitoring material. Confirm the current edition and applicability before treating either as a requirement. Following a framework does not by itself establish legal compliance or prove that a particular architecture is safe. The cited guidance is primarily from U.S. agencies and partners; obligations vary by country, regulator, contract and sector.
A phased implementation plan
First 30 days: establish control
- Name an OT security owner and an engineering decision owner for each installation.
- Identify internet-facing, remotely reachable and cloud-connected assets.
- Remove clearly unnecessary exposure and change default credentials.
- Document emergency contacts, local operating modes and current recovery media.
Next 60–90 days: make pathways explicit
- Complete the asset inventory and data-flow map.
- Define zones, conduits and permitted communications.
- Move remote work behind a controlled jump host and named accounts.
- Start passive monitoring and establish operating-mode baselines.
Ongoing: validate resilience
- Run the patch and change workflow for supported and legacy assets.
- Review accounts, firewall rules, cloud destinations and monitoring alerts on a defined schedule.
- Test restoration, loss-of-link behavior and incident decision trees.
- Reassess the design whenever equipment, suppliers, process hazards or regulations change.
Common failure modes and corrections
- “The VPN makes it secure.” A VPN protects a transport path but does not supply least privilege, session approval, asset isolation or OT-aware monitoring. Put the connection behind a jump host and constrain the destination.
- “MFA solves remote access.” MFA reduces credential abuse; it does not prevent an authorized user from making an unsafe change. Add role separation, time limits, logging and engineering approval.
- “The inventory is finished.” Static spreadsheets miss temporary devices and undocumented links. Reconcile records with passive discovery, configuration reviews and interviews with operators and suppliers.
- “Block everything during an incident.” Abrupt isolation can interrupt protective or monitoring functions. Use the incident decision tree and have the control owner direct containment.
- “A cloud outage is only an IT problem.” If operators rely on cloud data or authentication, loss of the service can affect operations. Test local control, queued data and manual fallback.
- “A framework certificate proves safety.” Standards and guidance help structure decisions; they do not replace a site-specific hazard review, commissioning tests or legal compliance analysis.
The Bottom Line
Connect drilling OT to cloud services only through documented, minimized and monitored pathways. Inventory every asset and dependency, separate zones with tightly defined conduits, mediate remote work through named and time-limited access, baseline normal industrial behavior, and test recovery without the cloud. The right controls depend on the installation’s process hazards, equipment and jurisdiction, so engineering ownership must remain part of every security decision.
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