top kill: meaning, definition, pronunciation and examples
C2Technical/Industry
Quick answer
What does “top kill” mean?
An oil well control technique to stop an uncontrolled flow (blowout) by pumping heavy fluid into the well from above.
Audio
Pronunciation
Definition
Meaning and Definition
An oil well control technique to stop an uncontrolled flow (blowout) by pumping heavy fluid into the well from above.
In oil and gas drilling, an emergency procedure involving pumping heavy drilling fluid (mud) into a blowing well at high pressure to overcome the upward pressure of hydrocarbons, forcing them back down. It is performed at the surface or at the wellhead after other methods have failed.
Dialectal Variation
British vs American Usage
Differences
No significant regional difference in meaning. The term is used internationally in the oil and gas industry.
Connotations
Connotes urgency, high-stakes engineering, and potential environmental disaster mitigation. Strongly associated with major blowout events.
Frequency
Extremely low frequency in general language. Its usage spikes in media coverage of major oil well blowouts (e.g., Deepwater Horizon, 2010).
Grammar
How to Use “top kill” in a Sentence
to top kill [well/blowout] (verb usage is rarer)a top kill of [the well]Vocabulary
Collocations
Examples
Examples of “top kill” in a Sentence
verb
British English
- The crew prepared to top kill the runaway well.
- They are top killing the blowout as we speak.
American English
- The team decided to top-kill the well before the storm hit.
- We can't top kill it until the BOP is sealed.
adverb
British English
- [Not standardly used as an adverb]
American English
- [Not standardly used as an adverb]
adjective
British English
- The top-kill procedure was their last resort.
- A top-kill attempt requires precise calculations.
American English
- The top kill operation was live on news channels.
- They reviewed the top-kill plan with regulators.
Usage
Meaning in Context
Business
Discussed in energy company crisis management and insurance reports.
Academic
Found in petroleum engineering journals and environmental risk studies.
Everyday
Almost never used unless discussing a major oil spill news event.
Technical
Standard term in drilling, well control, and well intervention manuals (e.g., IWCF standards).
Vocabulary
Synonyms of “top kill”
Strong
Neutral
Weak
Vocabulary
Antonyms of “top kill”
Watch out
Common Mistakes When Using “top kill”
- Spelling as one word: 'topkill'. While common in informal industry use, dictionaries often list it as two words.
- Confusing it with 'bottom kill' (injecting from a relief well into the reservoir).
- Using it as a general term for stopping any process (it's specific to well control).
FAQ
Frequently Asked Questions
In most formal technical writing, it is written as two separate words ('top kill'), though the hyphenated form 'top-kill' is also common, especially when used as a modifier.
A 'top kill' pumps heavy fluid into the well from the surface, down the original wellbore. A 'bottom kill' injects fluid from a relief well that intercepts the original well near its base, deep underground, which is often considered safer and more reliable.
Failure can occur if the pumping pressure is insufficient to overcome the reservoir pressure, if the fluid is not heavy enough, if there is too much gas in the wellbore causing unloading, or if the wellhead equipment is too damaged to contain the pressure.
Yes, BP attempted a 'top kill' in May 2010, which involved pumping heavy drilling mud into the failed blowout preventer. After three days of attempts, it was declared unsuccessful, leading to the eventual use of a containment cap and a successful 'bottom kill' via a relief well.
An oil well control technique to stop an uncontrolled flow (blowout) by pumping heavy fluid into the well from above.
Top kill is usually technical/industry in register.
Top kill: in British English it is pronounced /ˌtɒp ˈkɪl/, and in American English it is pronounced /ˌtɑːp ˈkɪl/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[Not applicable; term is technical, not idiomatic]”
Learning
Memory Aids
Mnemonic
Think: At the TOP of the well, they KILL the dangerous flow.
Conceptual Metaphor
A BATTLE/FIGHT metaphor: The well is an adversary that must be 'killed' or subdued.
Practice
Quiz
What is a 'top kill' primarily used for?