What does a field operator do in oil and gas production?

I. Core responsibilities (Field Operator — Oil & Gas Production)

Frontline operation of wells and surface facilities to safely maximize hydrocarbon throughput, maintain equipment reliability, and ensure accurate measurement/compliance.

• 1.1 Surveillance & control — Conduct structured rounds; capture pressures, temperatures, rates, levels, vibrations; adjust chokes, valves, and setpoints per procedures; reset minor trips; escalate abnormal trends.
• 1.2 Start-up/shutdown — Execute controlled start-up and shutdown of wells, separators, heaters, compressors, pumps, dehydrators, and VRUs following cause–effect and ESD logic.
• 1.3 Well testing & allocation — Operate test separators/portable test units; stabilize and record oil, water, gas; sample for BS&W/API; calculate net oil, water cut, and GOR; enter results into production systems.
• 1.4 Measurement & custody transfer — Gauge tanks, operate LACT units, witness/prove meters (with measurement techs), issue run tickets, reconcile volumes, and identify imbalances or losses.
• 1.5 Artificial lift field adjustments — Implement field-set adjustments (e.g., plunger lift cycle timing, gas-lift valve checks, rod-pump time clocks/VSDs) under engineer guidance.
• 1.6 Chemical management — Monitor and adjust injection rates for corrosion inhibitor, scale inhibitor, demulsifier, biocide, and methanol; track inventories and dosage effectiveness.
• 1.7 Produced water & disposal — Operate skim tanks, IGF/WEMCO, filters, and disposal pumps/injection wells; maintain discharge quality or injection pressure within limits.
• 1.8 Pigging & line operations — Prepare, launch, and receive pigs; isolate, depressure, and manage differential pressure; verify pig passage; complete pigging reports.
• 1.9 Reliability and PMs — Perform routine maintenance (lubrication, strainer cleaning, belt/packing checks, filter change-outs), valve strokes, instrument loop checks with I&E techs.
• 1.10 Safety & permits — Lead/participate in JSAs, apply PTW and LOTO, perform gas testing, maintain H2S readiness, conduct fire/gas/ESD drills, and ensure safe work boundaries.
• 1.11 Troubleshooting — Diagnose foaming, carryover, sand-fouling, hydrate risk, paraffin/asphaltene issues, seal leaks, overheating, cavitation, and high vibration; implement safe field fixes.
• 1.12 SCADA/HMI & data quality — Monitor alarms, acknowledge events, input meter factors/offsets as authorized, and ensure accurate, time-stamped data entries and shift logs.
• 1.13 Compliance & reporting — Record emissions, flare volumes, VRU runtimes, spill response, near-misses; maintain regulatory logs and environmental controls.
• 1.14 Vendor/contractor coordination — Escort and oversee haulers, chemical reps, well service crews, and inspection contractors; verify work scope and site readiness.
• 1.15 Shift handover & documentation — Complete handover notes, equipment status, open permits, isolations, and outstanding alarms; update route books and P&ID markups.

I.A Key field calculations used (examples)

• 1.A.1 Water cut: \( \displaystyle WC = \frac{V_{\text{water}}}{V_{\text{oil}} + V_{\text{water}}} \)
• 1.A.2 Net oil rate: \( \displaystyle Q_{\text{net\_oil}} = Q_{\text{liq}} \cdot \left(1 - WC - S\&W\right) \)
• 1.A.3 Gas–oil ratio: \( \displaystyle GOR = \frac{Q_g}{Q_{\text{net\_oil}}} \)
• 1.A.4 API gravity: \( \displaystyle API = \frac{141.5}{SG_{60^{\circ}F}} - 131.5 \quad \Rightarrow \quad SG_{60^{\circ}F} = \frac{141.5}{API + 131.5} \)
• 1.A.5 Tank volume (vertical cylinder): \( \displaystyle V(h) = \pi r^2 h \) with temperature correction via \( \displaystyle V_{60^{\circ}F} = \frac{V_{T}}{CTL} \)
• 1.A.6 Meter correction: \( \displaystyle Q_{\text{std}} = Q_{\text{indicated}} \times MF \)
• 1.A.7 Chemical dosage: \( \displaystyle \text{Dose}~(\mathrm{mg/L}) = \frac{\text{mass injected (mg)}}{\text{fluid volume (L)}} \)

II. Required skills, competencies, and physical demands

II.A Technical skills

• 2.A.1 Process operations — Separators, heaters, glycol/amine dehydration basics, compression, VRU, produced-water treatment.
• 2.A.2 Measurement — Tank gauging, LACT operation, meter proving support, BS&W testing, API gravity and shrinkage awareness.
• 2.A.3 P&IDs and cause–effect — Interpret PFDs/P&IDs, shutdown keys, instrument ranges, control loops.
• 2.A.4 SCADA/HMI — Alarm management, trends, basic setpoint entry under MOC/authorization.
• 2.A.5 Mechanical aptitude — Pumps, seals, rotating equipment, valve packing, flange assembly, leak checks.
• 2.A.6 Safety systems — PTW, LOTO, gas testing, H2S/BA sets, confined space awareness, hot work boundaries.
• 2.A.7 Field calculations — Conversions, standard conditions, CTL/CPL factors, orifice/DP readings (awareness).

II.B Soft skills

• 2.B.1 Situational awareness — Hazard recognition, stop-work authority.
• 2.B.2 Communication — Clear radio comms, shift handovers, concise log entries.
• 2.B.3 Prioritization — Route planning, response to alarms vs. routine tasks.
• 2.B.4 Collaboration — Interface with engineers, techs, and contractors; follow procedures.
• 2.B.5 Documentation rigor — Accurate measurement tickets, permits, and checklists.

II.C Physical and regulatory requirements

• 2.C.1 Physical — Walk several miles per shift, climb ladders/stairs, carry 25–50 lb, work in heat/cold, kneel/crouch for inspections.
• 2.C.2 PPE — FRCs, hard hat, gloves, eye protection, steel toes, H2S monitor; SCBA fit test for H2S facilities.
• 2.C.3 Fitness & driving — Valid driver safety credentials; long-distance driving on lease roads.
• 2.C.4 Training — H2S, First Aid/CPR, PTW/LOTO, confined space awareness, fall protection; offshore roles require sea survival.

III. Typical tools, software, and equipment used

• 3.1 Control/IT — SCADA/HMI terminals, historian/viewers, mobile production data apps, CMMS work-order apps, handheld RFID/barcode scanners.
• 3.2 Measurement — Tank tapes, thermometers, thief samplers, centrifuges for BS&W, hydrometers/API thermohydrometers, portable Coriolis/turbine test meters, prover connections.
• 3.3 Instrumentation — Pressure calibrators, deadweight testers (with techs), multimeters, handheld communicators for smart transmitters (with I&E).
• 3.4 Safety — Multi-gas detectors (H2S/LEL/O2/CO), SCBA sets, emergency eyewash checks, fire extinguishers, spill kits.
• 3.5 Mechanical — Hand tools, torque wrenches, grease guns, filter strap wrenches, valve keys, pig launch/receive tools.
• 3.6 Diagnostic — IR thermometer/camera, ultrasonic thickness gauge (with inspectors), vibration pens.
• 3.7 Communications — Two-way radios, satellite phones (remote areas), vehicle GPS/AVL units.

IV. Work environment

• 4.1 Locations — Onshore leases, tank batteries, central facilities, gathering/boosting stations, gas plants; offshore fixed platforms or FPSO topsides.
• 4.2 Shifts/rotations — Onshore routes: 8–12-hour shifts with on-call duty; offshore: 14/14 or 28/28 rotations; night shifts for some assets.
• 4.3 Travel — 30–90% field time; extensive driving between sites; helicopter/boat transfers offshore.
• 4.4 Conditions — Weather exposure, noisy areas, hydrocarbon/chemical handling, H2S zones, heights and confined areas by permit.
• 4.5 Overtime/outages — Call-outs for alarms/upsets; extended hours during start-ups, pigging campaigns, or turnarounds.

V. Reporting lines and cross-functional interfaces

• 5.1 Reports to — Production/Operations Supervisor (onshore) or OIM/Platform Supervisor (offshore). Shift may be led by a Lead/Charge Operator.
• 5.2 Interfaces — Production engineers, reservoir engineers (well performance), facilities engineers (modifications), I&E and mechanical techs (maintenance), measurement specialists (custody transfer), HSE advisors, pipeline control/dispatch, logistics, third-party haulers/contractors, and regulators when escorted.
• 5.3 Handoffs — Daily logs and test sheets to engineers; measurement tickets to accounting/measurement; maintenance notifications to CMMS planners; permit packages and isolations to contractors.

VI. Career ladder

• 6.1 Field Operator ? Lead/Charge Operator — Expands to coordinating routes, mentoring, permit issuer authority, and outage coordination.
• 6.2 Lead/Charge Operator ? Panel/Control Room Operator — Focus on DCS/SCADA control, alarm management, optimization across multiple trains/fields.
• 6.3 Panel Operator ? Production/Operations Supervisor — Team leadership, scheduling, KPIs, budget inputs, regulatory liaison.
• 6.4 Specialist tracks (lateral) — Measurement technician, I&E technician, Reliability tech, or Wellsite/Workover supervisor, depending on interest and certifications.
• 6.5 Senior leadership — Operations Superintendent/Manager overseeing multi-field assets or offshore complexes.

VII. Deliverables & interfaces

• 7.1 Deliverables — Daily production reports, well test sheets, shift handover logs, PTW/LOTO documentation, JSA records, LACT tickets and tank gauge sheets, chemical usage logs, emissions/flare logs, spill/incident reports, CMMS work requests.
• 7.2 Recipients — Operations supervision, production/measurement/accounting teams, maintenance planners, HSE, and engineering for analysis/optimization.

VIII. Toolchain snapshot

• 8.1 Software — SCADA/HMI, historian/trending, production data capture, CMMS work orders, mobile inspection apps.
• 8.2 Measurement — Tank gauging tools, thief samplers, centrifuge BS&W kits, hydrometers, portable test meters, prover connections.
• 8.3 Safety/diagnostics — Multi-gas detectors, SCBA, IR camera/thermometers, vibration pens, ultrasonic thickness (with inspectors).
• 8.4 Mechanical — Hand/torque tools, filter/strainer tools, pigging equipment, lubrication tools.

IX. Progression trigger

• 9.1 Lead/Charge Operator — Typically promoted after 18–36 months (estimated), consistent safe performance across 15–30 wells/facility trains, plus PTW Issuer, H2S Supervisor-level, measurement basics, and SCADA alarm-management training.
• 9.2 Panel/Control Room Operator — After demonstrating full start-up/shutdown competency and abnormal-situation handling, plus DCS fundamentals and Management of Change competency (estimated 3–5 years total experience).
• 9.3 Production/Operations Supervisor — 5–8 years experience, proven leadership, incident command familiarity, budgeting/KPI literacy, and strong audit/compliance record (estimated).

For current openings, search jobs on Rigzone.