A – B – C – D – E – F – G – H – I – J – K – L – M – N – O – P – R – S – T – U – V – W – X
| HAPC | Habitat area of particular concern |
| HAL | Halliburton |
| HOA | Hand/on/off (switch) |
| HA | Hazard analysis |
| HAZOP | Hazard and operability (analysis) |
| HAZCOM | Hazard communications |
| HAZID | Hazard identification (study) |
| HAZOP | Hazardous Operation |
| CESQG | Hazardous waste conditionally exempt small quantity generator |
| LQG | Hazardous waste large quantity generator |
| HAZWOPER | Hazardous waste operations and emergency response |
| SQG | Hazardous waste small quantity generator |
| HRCC | HCAl of Calliper (in Inches) |
| HSMP | Health and safety management plan |
| HES | Health, environment, and safety |
| HSE | Health, safety, and environmental |
| HSSE | Health, safety, security, and environment |
| HAZ | Heat Affected Zone |
| C7+ | heavy hydrocarbon components |
| HLO | Heavy Load-out (Facility) |
| HWDP | Heavy weight drill pipe |
| HWDP | Heavy Weight Drill Pipe |
| h | Height or thickness |
| HLO | Helicopter Landing Officer |
| HUET | Helicopter underwater egress training |
| HDA | Helideck Assistant |
| HTM | Helideck Team Member |
| HFRS | Helix Fast Response System |
| HWCG | Helix Well Containment Group (an industry cooperative of 24 deepwater E&P companies working in the Gulf of Mexico) |
| HE | Henderson Gulf of Mexico leasing area |
| HH | Henry Hub |
| HEXT | Hex Diplog |
| C6 | hexanes |
| HGS | High (Specific-)Gravity Solids |
| HIPPS | High Integrity Pressure Protection System |
| HI | High Island Area Gulf of Mexico leasing area |
| HPWBM | High Performance Water Base Mud |
| HP | High pressure |
| HPGAG | High Pressure Gauge |
| HPHT | High pressure, high temperature |
| HDT | High Resolution Dipmeter Log |
| HT | High temperature |
| HTHP | High Temperature High Pressure (same as HPHT) |
| HVDC | High Voltage Direct Current |
| HCA | High-consequence areas |
| HP/IP | High-pressure and/or intermediate pressure |
| HPU | High-pressure unit |
| HUD | Hold Up Depth |
| HL | Hook Load |
| HCCS | Horizontal Clamp Connection System |
| HCM | Horizontal Connection Module. To connect the Xmas Tree to the Manifold |
| HDD | Horizontal directional drilling |
| HPU | Horizontal pumping unit |
| hp | Horsepower |
| HWP | Hot work permit |
| HH | Howell Hook Gulf of Mexico leasing area |
| HPPS | HP Pressure Log |
| HCAL | HRCC Calliper (in Logs)(in Inches) |
| HFE | Human Factors Engineering |
| HFL | Hydraulic flying lead |
| HHP | Hydraulic Horsepower |
| HPU | Hydraulic Power Unit |
| HC | Hydrocarbons |
| HFC | Hydrofluorocarbons |
| HISC | Hydrogen induced stress cracking |
| H2S | Hydrogen sulfide |
| HYROP | Hydrophone Log |
| HP | Hydrostatic Pressure |
| HEC | Hydroxyethylcellulose |
| HPG | Hydroxyl propyl guar |
| HYPJ | Hyperjet |