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Secure a cloud-connected drilling operation by treating every connection as a controlled operational pathway—not as a simple IT integration. Start with an accurate inventory of controllers, safety systems, engineering workstations, historians, gateways, site networks and cloud services. Then remove unnecessary exposure, separate assets into zones with restricted conduits, mediate remote work through a monitored jump host, establish a baseline of normal industrial traffic and plan patching and incident response around process safety and availability.
There is no universal architecture for every land rig, offshore installation or drilling contractor. The practices below adapt cross-sector guidance from the U.S. Cybersecurity and Infrastructure Security Agency (CISA), including its monitoring guidance, ICS recommended practices, joint asset-inventory guidance and the Principles of Operational Technology Cybersecurity released on October 1, 2024. They are not a drilling-specific security standard or an engineering procedure. Validate each control against your process hazards, safety case, supplier support conditions and local legal requirements.
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Define the operational boundary before choosing cloud controls
“Drilling system” can describe very different installations. One site may include programmable logic controllers, distributed control or rig-control systems, human-machine interfaces, engineering workstations, safety instrumented systems, power and top-drive controls, historians, condition-monitoring gateways and a site operations network. Another may have a smaller control footprint but several vendor-maintained packages. Cloud services might receive historian data, maintenance records, alarms or analytics; they should not automatically receive the ability to issue control commands.
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CISA’s principles are cross-sector critical-infrastructure guidance developed with ASD’s ACSC, the FBI, the NSA and international partners. They help organizations examine how business decisions can adversely affect OT cybersecurity; they do not certify a design or establish legal compliance.
Build an inventory that describes function, consequence and communication
You cannot secure pathways you have not identified. Use an inventory that describes what an asset does, what depends on it and how it communicates. CISA’s joint OT asset-inventory guidance describes organizing assets by operational function or criticality and using ISA/IEC 62443-style zones and conduits: a zone groups assets with shared security requirements, while a conduit constrains communication between zones.
Record the minimum useful fields
| Inventory field | What to capture | Why it matters |
|---|---|---|
| Identity and location | Hostname, device type, serial or tag, rig or facility, cabinet or network location | Lets responders find the physical and logical asset. |
| Operational role | Control, safety, supervisory, historian, gateway, engineering or support function | Shows what could happen if the asset is unavailable or altered. |
| Criticality and consequence | Effects on personnel safety, well control, environment, production and recovery | Supports prioritization and access decisions. |
| Owner and maintainer | Responsible operational team, supplier and support contact | Prevents orphaned systems and unclear approvals. |
| Software and support status | Firmware, operating system, application version, support and end-of-life position | Determines patch options and residual risk. |
| Connections | Source and destination, protocol, direction, port or service, business purpose and frequency | Provides the basis for firewall rules and anomaly detection. |
| Access paths | Local consoles, engineering laptops, jump hosts, vendor links and cloud interfaces | Exposes unplanned routes into OT. |
Inventory in a repeatable sequence
- Collect existing records. Reconcile drawings, control-system databases, switch and firewall configurations, supplier documentation and maintenance lists. Treat each source as incomplete until checked.
- Validate passively first. Observe network traffic and consult operators before active scanning. An unknown scan can disrupt fragile or safety-related equipment.
- Assign function and consequence. Mark assets that support personnel protection, well control, pressure management, shutdown, power or recovery. An asset’s business value alone is not an adequate criticality measure.
- Map dependencies. Document which controllers depend on engineering workstations, time sources, historians, authentication, domain services, gateways and communications links.
- Draw data-flow diagrams. Show every boundary between field networks, control networks, site operations, enterprise services, supplier access and cloud services. Include direction and purpose, not merely a line between switches.
- Record uncertainty. Flag unknown devices, undocumented modems, temporary laptops and unsupported software for investigation. An uncertain connection should not be treated as trusted.
Decide what should connect to the cloud
For each proposed connection, answer three questions: What operational outcome requires it? What is the least data and least privilege needed? What is the safe state if the cloud, link or gateway is unavailable? If no clear owner can answer, do not connect the asset yet.
| Use case | Safer starting pattern | Questions to resolve |
|---|---|---|
| Historian or condition data | Replicate selected, read-only data through a controlled gateway or OT DMZ | Which tags are necessary? How is stale or corrupted data identified? Does the local operation continue if replication stops? |
| Alarm and event forwarding | Outbound, filtered event stream with local alarm handling retained | Who receives alerts, and how are duplicates, delays and loss handled? |
| Maintenance diagnostics | Brokered access to approved diagnostic data, separated from control functions | Can a diagnostic account alter configuration? What evidence is retained? |
| Remote engineering | Time-limited session through an approved jump host, with an operator or engineer supervising | What exact task requires it, and what is the rollback plan? |
| Cloud command or configuration | Exceptional case requiring a documented safety and engineering review | Is remote write capability genuinely necessary? Can a local interlock and independent approval prevent an unsafe change? |
Remove or redesign connections that have no current operational justification. Cloud availability, analytics value or convenience is not by itself a reason to expose a controller or safety system.
Segment OT into zones and tightly controlled conduits
Segmentation is a design decision about consequence and communication, not a label applied after installation. Group systems that share security requirements, then constrain the conduits between groups. A representative arrangement may include the following zones, but the correct boundaries depend on the installation:
- Process-control zone: controllers, operator stations and other systems needed for real-time control.
- Safety zone: safety instrumented or emergency-shutdown functions, separated according to the safety architecture and engineering requirements.
- OT supervisory zone: historians, alarm servers and operational applications that need carefully limited access to control networks.
- OT DMZ or transfer zone: brokers, update repositories, remote-access gateways and replication services that mediate between OT and enterprise or cloud environments.
- Enterprise and cloud zones: business applications and hosted services, treated as external to the control environment even when operated by the same organization.
- Supplier-access zone: controlled pathways for approved maintenance organizations, not a permanent extension of a vendor network.
Permit only documented flows between zones. A firewall rule should identify the source, destination, protocol, direction, purpose, owner and review condition. Avoid placing controllers directly on a public address or allowing a cloud service to reach an entire subnet because one application needs one data stream. Where a control or safety function can remain entirely local, design it to do so; cloud loss should not remove the operator’s ability to place the process in a safe state.
Make remote access a controlled operational procedure
CISA’s ICS recommended practices include dedicated guidance on configuring and managing remote access. Remote access should be justified, mediated, monitored and consistent with the site’s operating requirements. A VPN or multifactor authentication (MFA) feature is useful, but neither one alone makes an unbounded pathway safe.
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- Approve it operationally. Obtain authorization from the responsible OT or engineering owner. For safety-related or control changes, include the appropriate process-safety authority and change procedure.
- Use an intermediary. Terminate the external session at a hardened jump host or remote-access gateway in the controlled transfer zone. Do not give an external party direct internet access to a controller, HMI or engineering workstation.
- Authenticate strongly. Change default passwords, use individual accounts and enable MFA where possible. Do not share a standing supplier credential; if a legacy product cannot support these controls, document the compensating measures and residual risk.
- Limit privilege and reach. Permit only the specific host, application and protocol required for the task. Separate viewing, diagnostics and configuration rights.
- Supervise and record. Have an authorized site operator or engineer observe high-impact work. Log authentication, session start and end, commands or file transfers where technically possible, and the resulting configuration change.
- Close and verify. Disable the session when the task ends, remove temporary rules, confirm the process remains in its expected state and store the work record with the change documentation.
Monitor both ingress and egress. An approved remote session can still be misused, compromised or left open after maintenance.
Baseline normal OT behavior and monitor for meaningful deviations
Monitoring should understand industrial communications rather than treating every packet like an ordinary office event. CISA’s monitoring material highlights asset discovery, expected-traffic baselines and detection of suspicious connections, configuration changes, unnecessary services and other indicators.
Capabilities to require
- Asset discovery: Identify devices, software versions, industrial protocols and newly appearing endpoints, including systems absent from the inventory.
- Traffic baselining: Learn which hosts communicate, in which direction, using which services and during what operating conditions. Keep separate baselines for startup, drilling, maintenance and shutdown when behavior legitimately changes.
- Boundary detection: Alert on unexpected communication between OT and external networks or movement between OT segments.
- Change detection: Flag controller logic or configuration changes, new applications, altered firewall rules, new accounts and unauthorized engineering-tool activity.
- Service exposure: Identify unnecessary services, listening ports, remote-management tools and protocols that were not approved for the zone.
- Context and escalation: Attach the asset owner, criticality and operating state to an alert so the control-room response is proportionate.
- Threat-intelligence use: Consider relevant intelligence feeds and common sharing formats, while ensuring that external data does not trigger unsafe automated action.
| Observed event | Initial operational question | Safe response direction |
|---|---|---|
| New device or protocol in a control zone | Was it installed, temporarily connected or overlooked? | Confirm with the site owner; isolate only under an approved procedure if isolation could affect control. |
| Unexpected OT-to-cloud or internet connection | Which approved service initiated it and what data left the site? | Block or constrain the path according to the incident and change procedures; preserve logs. |
| Engineering workstation changes controller configuration | Is there an authorized work order and operator present? | Verify the change, capture the before-and-after state and escalate unauthorized activity. |
| Traffic between zones outside the baseline | Is this a known startup, maintenance or recovery condition? | Validate the operating state before taking containment action. |
| New service or application on an OT host | Was it approved, supported and tested? | Have the owner and supplier assess it; remove or restrict it if unnecessary and safe to do so. |
Do not equate a high volume of alerts with good monitoring. A useful system presents deviations that an operations team can investigate without creating alarm fatigue or unsafe automated responses.
Plan patching, recovery and incident response around availability
Patch-management and incident-response practices for ICS need more than a generic IT calendar. The supported product, test environment, operational window, safety implications and site procedures determine when and how a patch can be applied. The available guidance does not establish one universal patch interval for drilling OT.
Use a controlled patch process
- Confirm that the vendor supports the firmware, operating system and application combination.
- Check release notes for protocol, timing, safety and compatibility effects.
- Test in a representative environment when possible, including communications with dependent systems.
- Define a rollback method and retain known-good configurations, logic, images and license information.
- Schedule work with the control-room and process-safety owners; document why an emergency patch or a compensating control is necessary.
- Verify alarms, interlocks, historian collection, remote-access rules and time synchronization after the change.
Prepare for loss of cloud or network service
Document how operators continue safely when the cloud, gateway, wide-area link or authentication service is unavailable. Local control, alarm handling and shutdown functions should have an explicitly defined fallback. Backups must be protected from the same account and network paths as production systems, and restoration should be exercised under site procedures rather than assumed from the existence of a backup file.
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Define an OT incident playbook
- Identify who can declare an OT incident and who has authority to change the process state.
- Preserve relevant network, authentication, gateway and engineering-workstation logs without delaying a safety response.
- Assess whether the event affects personnel safety, well control, environmental protection, production or recovery.
- Contain the pathway in a manner that does not create a more dangerous process condition.
- Recover from a verified known-good configuration, then validate controls, alarms and communications.
- Record decisions, notify required parties and update the inventory, baseline and procedures after the event.
Choose monitoring and access tools by operational fit
Official guidance does not designate a product as approved. Evaluate each tool against the installation’s protocols, bandwidth, topology, safety constraints and support model. Ask for evidence in a representative test environment rather than assuming that an IT security feature behaves safely on a control network.
| Selection axis | Questions to ask |
|---|---|
| Collection method | Is collection passive, active or hybrid? What traffic, polling or agents are introduced, and what is the effect on fragile devices? |
| Industrial protocol coverage | Can it interpret the protocols and vendor implementations actually used on the rig, including encrypted or proprietary segments? |
| Inventory quality | Does it identify assets, roles, software versions, dependencies and changes, or only IP addresses? |
| Behavior baselining | Can it distinguish normal startup, maintenance and drilling states from suspicious deviations? |
| Remote-site deployment | Can it operate with limited bandwidth, intermittent links and multiple isolated installations without requiring cloud availability for local visibility? |
| Response integration | Can alerts and logs reach the incident-response process while preserving the context operators need? |
| Lifecycle and support | How are signatures, protocol parsers, software updates, vulnerabilities and end-of-life handled? Who supports the deployment during an outage? |
Validate claims with the actual control-system supplier and site engineering team. A tool that discovers more devices but disrupts timing, overloads a link or produces unusable alerts is not an improvement.
Governance: make security decisions part of engineering change control
Assign an accountable owner for every cloud connection, conduit, remote-access rule and monitoring alert. Include cybersecurity review in management-of-change processes, supplier onboarding, commissioning, decommissioning and emergency work. Record the operational justification, affected safety functions, fallback state, approval authority and review trigger.
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The cited materials are primarily U.S. agency and partner guidance. Duties for critical infrastructure, offshore operations, privacy, incident reporting and worker safety vary by jurisdiction and sector; involve qualified legal and regulatory specialists where applicable.
A practical implementation sequence
- Establish ownership and safety constraints. Name the OT security, control-system, process-safety, operations and supplier contacts for each installation.
- Complete the inventory and flow map. Resolve unknown assets and undocumented remote links before expanding cloud use.
- Classify and zone. Group assets by function and consequence; define conduits and permitted communications.
- Reduce exposure. Remove unnecessary internet reachability, change default credentials, patch supported systems and place necessary remote access behind a jump host.
- Implement monitored access. Require individual authentication, MFA where possible, least privilege, approval, session logging and prompt closure.
- Deploy fit-for-purpose visibility. Discover assets, establish operating-state baselines and tune detections with operators.
- Exercise resilience. Test local operation during cloud or link loss, verify restoration of known-good configurations and rehearse the incident playbook.
- Review continuously. Reassess connections after equipment, supplier, software, process or regulatory changes; update the inventory and baselines.
Failure modes that undermine otherwise good designs
- “The firewall means it is secure.” A permissive rule, stolen credential or unmanaged modem can bypass the intended boundary. Review actual paths and logs.
- “MFA solves remote access.” MFA verifies a user; it does not define the user’s privilege, task, destination or safe change procedure.
- “The cloud only reads data.” Gateways, credentials and update channels can still create a route toward OT. Separate read-only collection from administrative access.
- “Active scanning is harmless.” Test discovery methods on representative equipment and prefer passive observation where device stability is uncertain.
- “More alerts are better.” Baselines must reflect legitimate operating states and produce actions an operator can safely take.
- “Patch on the corporate schedule.” OT patch timing depends on support status, testing, operational windows and safety implications; document compensating controls when immediate patching is not possible.
- “The diagram is the inventory.” Drawings become stale. Reconcile them with observed traffic, configuration records and operator knowledge.
- “Cloud loss is only an IT outage.” If operators depend on cloud authentication, data or commands, define and test the local fallback before deployment.
The secure outcome is a drilling operation that knows what is connected, why each pathway exists, what normal behavior looks like and who can authorize a change. Cloud analytics and remote support can then be added without silently turning the control environment into an extension of an uncontrolled external network.
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