19. Intro Drilling & Cementing

Question 1

Types of Rigs

Answer 1

Drillship, Semi-submersible, Jackup, submersible, land

Question 2

Derrick

Answer 2

Main structure through which all the drilling operations performed; can suspend millions of pounds in weight; used to apply weight to the drill string

Question 3

Mud System

Answer 3

Well Control, control leak-off; cooling & lubrication; transport drilling debris; provide drilling power (motor)

Question 4

BOP RAM functions

Answer 4

Blind, Shear, Slip, Pipe RAM

Question 5

Casing

Answer 5

Large pipe run into the wellbore to protect the integrity of the hole and isolate various parts of the formation from each other and the surface; concentric with smalles diameter reaching the greatest depth and largest diameter closer to surface

Question 6

Four most common casings from surface to downhole

Answer 6

Conductor, surface, intermediate, production casing

Question 7

Objectives of Well Cementing

Answer 7

Zonal Isolation; Support for subsequent casing strings; protection for the casing; protection of the borehole

Question 8

Primary Cementing Steps

Answer 8

Mud circulation by rig pump; pressure test; pump wash and spacer; dropping bottom plug; mixing slurry; pump lead slury; pump tail slury; dropping top plug; displacement; check returns

Question 9

Which has a lower density lead or tail slurry?

Answer 9

Lead because it will be covering the upper part of the annulus.

Question 10

Plug Cementing

Answer 10

Sidetraccking; abandonment; depleated zone plug; lost circulation plug; Open-hole test anchor

Question 11

Remedial/Squeeze Cementing

Answer 11

repair improper zonal isolation; raise the top of the cement; plug perforations; repair corroded casing

Question 12

Difference in top and bottom plug

Answer 12

Load bottom plug into cement head first; bottom plug is not solid because it has to rupture