12.10.5 RiskSubCategory
| Topic Version | 1 | Published | 11/11/2016 | ||
| For Standard | WITSML v2.0 | ||||
| Type: | Enumeration | Stereotype: | «Enumeration» | ||
Specifies the sub-category of risk, in relation to value of Risk Category.
|
Name |
Type |
Notes |
|---|---|---|
|
gas kick |
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shallow water influx |
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other influx or kicks |
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loss circulation |
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poor hole cleaning |
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good hole cleaning at high ROP |
Rate of Penetration |
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high mud weight |
High mud weight (i.e., greater than 10 parts per US gallon). |
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special additives needed |
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gumbo problems |
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high ECD - rheology related |
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excessive circulation |
Greater than 2 hours. |
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performing a kill |
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mud weight change |
Greater than 0.5 parts per US gallon. |
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excessive pipe cement scaling |
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pit gain or loss |
Greater than ten barrles. |
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mud stability problems |
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shallow gas flow |
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twist off |
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stuck pipe |
Greater than 30 minutes. |
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wireline stuck in hole |
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stick and slip |
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vibration - axial |
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vibration - torsional |
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vibration - transverse |
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vibration unknown or rough drilling |
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uneven wear of BHA |
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uneven wear of drillstring |
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excessive torque |
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excessive drag |
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reaming greater than 2 hours |
Greater than 2 hours. |
|
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washouts |
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tight hole or overPull |
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failed inspections or fatigue wear |
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|
mechanical |
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drilling greater than 1000 feet/day |
Greater than 1000 feet per day. |
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drilling greater than 2000 feet/day |
Greater than 2000 feet per day. |
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drilling less than 20 feet/day |
Less than 20 feet per day. |
|
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trips greater than 24 hours |
Greater than 24 hours. |
|
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excessive time for BHA makeup |
Bottom Hole Assembly |
|
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waiting on decisions |
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waiting on weather |
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waiting on tools |
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sloughing or packoffs |
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ballooning |
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fracture problems |
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unstable zones |
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formation integrity test |
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leak-off test |
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tectonics |
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pore pressure |
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breakouts |
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|
bed parallel |
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wellbore stability |
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excessive doglegs |
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|
sidetrack |
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|
BHA change for directional |
Bottom Hole Assembly |
|
|
wrong total flow area |
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|
well collision - actual |
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well collision - technical |
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|
geosteering |
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abnormal tendency changes |
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resurveying |
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in-field referencing (IFR) actions |
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|
bit or BHA performance |
Bottom Hole Assembly |
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drilling optimization |
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|
bit balling |
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lost cones or broken cutters |
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excessive bit wear or gauge |
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low rate of bit penetration |
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high rate of bit penetration |
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|
downhole tool |
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|
surface system |
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motor or rotary steerable system failure |
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topdrive failure |
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hoisting equipment failure |
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circulating equipment failure |
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electrical system failure |
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blow out preventer events |
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surface instrumentation problems |
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rig communications |
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|
completion equipment failure |
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miscellaneous rig equipment |
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tool or equipment failure |
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|
squeeze jobs |
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|
casing surge losses |
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|
stuck casing or completion |
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|
shoe failures |
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|
early cement setup |
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casing collapse |
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|
milling |
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excessive casing wear or cuttings |
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excessive formation damage or skin |
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casing rotation or reciprocation rqd |
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|
broaching |
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completion or casing |
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stratigraphy |
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|
fishing |
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|
junk in hole |
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delay due to political unrest |
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|
rig move |
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|
gas hydrates |
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pending analysis |
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riser disconnect |
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other |
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|
personnel |
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environmental |
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automotive |
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|
asset |
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|
information |
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|
time |
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|
HSE |
health, safety and environmental |
|
Association |
Notes |
|---|---|
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From: RiskSubCategory. To: TypeEnum Generalization |
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From: Risk. To: RiskSubCategory Dependency |