Single stage job calculations 2

Question 1

name the critical values in a single stage calculation?

Answer 1

Dimensions and capacity of the open hole and casing
Annular volume of the casing in open hole and in previous casing
Cementing information such as API slurries and density of additives
Absolute volume information

Question 2

Name the section of your Field Data Handbook where yo can find information 
Cement Slurry Properties
Outside diameter displacement of tubing and drill pipe
Drillpipe displacement bbl/ft
Density of additives
Slurry volumes
Capacities - holes
Capacities-tubing, drillpipe, casing.

Answer 2

Section 3 Capacities (tubing drillpipe casing and holes), drillpipe displacement and OD displacement of tubing and drill pipe
Section 5 Slurry volumes
Section 7 Density of additives and cement slurry properties.

Question 3

Is the volume between the collar and the shoe important in single-stage calculations?

Answer 3

Yes

Question 4

Is the volume of the open hole below the casing shoe critical to single stage calculations?

Answer 4

No, (the vol in the rathole), the mud in the rathole tent to maintain there and the cement to go upward

Question 5

how many times more water the prehydrated bentonite absorbs than the conventional one?

Answer 5

4 times

Question 6

How much volume must be overdisplacement for a shoe track?

Answer 6

1/2 of the volume capacity

Question 7

how Yield slurry is changed?

Answer 7

by modifying the solid-to-liquid ratio of the cement slurry by adding water.

Question 8

what do total water requirement include?

Answer 8

Mix water needed (+20% safety margin)
Dead volume of the tank (mix fluid)
Water for washes spacers and displacement
20 bbl for priming and washing up

Question 9

what is the total time in a cementing job?

Answer 9

the minimum thickening timer for the slurry to be used

Question 10

what does the estimated time for cementing operations include?

Answer 10

Mixing Time
Displacement Time
10 min for plug drops and other activities
1 hr safety margin

Question 11

How does the minimum thickening time must be?

Answer 11

the greater of 1.5 times the job’s time

or plus 2 hr

Question 12

How many gallons a barrel is

Answer 12

42 gal/bbl

Question 13

how many gallons a ft3 is

Answer 13

7.48 gal/ft3

Question 14

Which of the next statements apply when ensuring water quality for a cementing job?

• Test cement and additives from samples supplied to the lab by manufacturer
• Perform lab test with the same water used during cement job.
• Use clean water from the site to test cement in laboratory.
• Run a confirmation lab test immediately prior to cementing

Answer 14

• Perform lab test with the same water used during cement job.
• Use clean water from the site to test cement in laboratory.
• Run a confirmation lab test immediately prior to cementing

Question 15

are displacement volume calculations affected in any way by the ID sampling of pipe lots?

Answer 15

yes

Question 16

Is there a method available to correct for the amount of air retained in Oil-based and salt systems?

Answer 16

Yes, there is a compressibility factor for the displacement fluid, calculated from density measurements of mud balances.

Question 17

considering current manufacturing practice, which method do you use for determining casing ID for calculations?

Answer 17

Determine the average between theoretical ID and the largest possible pipe diameter within API specifications

Question 18

How is cement yield improved?

Answer 18

by modifying the solid to liquid ratio of the cement slurry adding water.
and modifying the density of the solids

Question 19

what is the maximum BWOC of bentonite that can be used?

Answer 19

25% BWOC

Question 20

How many samples from a lot of sections of pipe would give an acceptable estimate of average pipe capacity and a more accurate displacement volume?

Answer 20

10% of the lot