Dril tech Flashcards
Type of drilling rig
land and marine rigs
land - light land rigs, heavy land rigs, and helicopter portable rigs
marine - floating rigs and bottom supported rigs
floating rigs - semi submersible, drill ships, drilling barge
bottom supported rigs - jackup, platform and submersible
Is a drilling rig which is specially designed to drill holes on onshore locations
land rig
Its main features are portability and maximum operating depth
land rig
Land rig components
mud pumps, mud tanks, draw works, top drive/rotary table, mast/derrick, drill string, primary power generation equipment and auxiliary power generation equipment
Key differentiation factors in drilling rigs
lifting capacity, horsepower, number of mudtanks and power and ability to circulate drilling fluid, size
Main features of land rigs
portability and maximum operating depth
Are built so that the derrick can be moved easily and reused for drilling new holes
land rig
Various rig components are _________ so that the rig can be moved in units and connected easily
skid mounted
Is assembled on the ground with pins and then raised as a unit using the rig hoisting equipment
jackknife, cantilever and derrick
Crew members can move land rig on ____…
truck, tractor, helicopter, heavy rolling gear
_____ can be moved pretty simple compared to ______
small land rig ultraheavy land rig
Price of oil rigs for land drilling in us
18M usd to 20M usd and can rise to 25M usd
Light Duty Rig Depth feet _____ Meter _____
3k to 5k 1k to 1.5k
Medium Duty rig Depth feet _____ Meter _____
4k to 10k 1.2k to 3k
Heavy duty rig Depth feet _____ Meter _____
12k to 16k 3.5k to 5k
Ultra heavy duty rig Depth feet _____ Meter _____
18k to 25k 5.5k to 7.5k
is a large stucture or on in water with facilities to drill wells, extract and process oil and natural gas and to temporarily store product until it can be brought to shore for refining and marketing
offshore rig
4 stages of rigs
exploration stage, appraisal stage, development stage, production stage
rigs are used to drill exploration wells and ‘wildcat’ wells for potential hydrocarbon bearing geologicaal structures after various geological studies and seismic surveys have identified locations in which these structures could be placed
exploration stage
rigs are used to drill several wells to understand flow rates and reservoir dynamics and to determine the size and limits of the reservoir in order to confirm the assumption that hydrocarbons can be produced economically
appraisal stage
rigs are used to drill wells to depth of a productive zone of the reservoir
development stage
rigs are used to drill more wells, also known as repair/work-over wells, to fix existing wells
production stage
this practice is also known as infield driling depending on the complexity of the job, asmaller work-over rig may be used for a work-over program to repair wells, enhace production or provide other well treatments
production stage
types of offshore rigs
workover, floaters and bottom supported
floaters = semi submersible and drill ship
bottom supported = jack up and platform
jack up = standard, high specification and harsh environment