Why OT Is a Different Problem
IT security assumes you can patch and restart. Field systems run production; a patch can interrupt wells, and a restart can stop a compressor. NIST SP 800-82 r3 and CISA guidance treat OT as its own discipline: availability first, safety-critical response, long service lives, and equipment that cannot run antivirus.
The Attack Paths That Matter
The common entries are not sophisticated: default passwords on RTUs, remote access ports left open for vendors, laptops that cross between office and field, and phishing that lands on the same network as the control system. ISA/IEC 62443 defines zones and conduits, the idea that the office network and the control network should not be one flat network.
The Baseline That Works
The realistic program: inventory every connected field device, change default credentials, put OT on its own network segment with limited firewall rules, require VPN for remote access, keep vendor access logged, and train field staff to recognize phishing. Most operators do not need a security team; they need a network drawing and a password policy.
The record that closes the loop
Operational Technology Security rests on the same field data as the rest of the operation: tickets, timesheets, approvals, and inspections. The same discipline shows up in Remote well monitoring and SCADA and Field communications and radio and Digital field ticket accuracy. If those records live in notebooks, email, and memory, start with an operations audit.