Cement Slurry Flow Properties and Mud Displacement

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Assignment Cement job | Cement Slurry Flow Properties and Mud Displacement

Cement Job Design: Laminar and Turbulent Flow

You are evaluating an intermediate casing string for the Assignment well, and you want to determine the type of flow in the annulus.

Contents

Assignment Cement job | Cement Slurry Flow Properties and Mud Displacement Cement Job Design: Laminar and Turbulent Flow Assessment “Cement job | Cement Slurry Flow Properties and Mud Displacement”

The string is 9-5/8″ in a 12-1/4″ Open Hole, and you are using Class G neat cement (density 15.8 ppg).

In this size string, $1\ BPM = 0.298\tfrac{ft}{sec}$ .

Determine whether the flow is laminar, transitional, or turbulent at 1, 2, 3, 4 and 5 BPM.

Cement Job Design Laminar and Turbulent Flow, Cement Job, Cement additives in drilling, cement additives, Cement Slurry Flow Properties, Mud Displacement

Solution

$D_2\ - D_1 = 12.25\ - 9.625\ = 2.625\ in$

$r = 15.8\ ppg$

$n\ = 1,\ 2,\ 3,\ 4,\ and\ 5\ \tfrac{bbl}{min} \times 0.298 \tfrac{ft}{sec}$

$m\ =\$ taken from the provided graph

So the $Re = 757 \times 2.625 \times 15.8 \times 0.298 \times \tfrac{Flow\ Rate\ (BPM)}{Viscosity\ (cP)}$

$= 9356 \times \tfrac{Flow\ Rate\ (BPM)}{Viscosity\ (cP)}$

Flow Rate (BPM)	Viscocity (cP)	Equation	Re	Flow Regime
1	250	Re= 9356×1 / 250	37	Laminar
2	100	Re= 9356×2 / 100	187	Laminar
3	40	Re= 9356×3 / 40	701	Laminar
4	12	Re= 9356×4 / 12	3119	Transitional
5	6	Re= 9356×5 / 6	7797	Turbulent

Assessment “Cement job | Cement Slurry Flow Properties and Mud Displacement”

1. What is viscosity?

A .The ratio of pressure to depth
B .The ratio of mass to volume
C .The ratio of stress to strain
D .The ratio of shear stress to shear rate Correct

2. What describes a dilute mix of cement and water pumped ahead of the cement slurry in turbulent flow to help remove gelled mud and filter cake?

A .Cement scavenger slurry Correct
B .Viscosifiers
C .Spacer fluid

3. Which of these hole conditions would be considered favorable for obtaining an optimal cement job? (Select all that apply.)

A .Free of drill cuttings Correct
B .Increasing hole diameter with depth
C .Thick, protective mud cake
D .Consistent hole diameter Correct
E .Free of swelling shales Correct
F .Few doglegs or washouts Correct

4. Identify a characteristic of turbulent flow within the annular space.

A .Fluid moves uniformly as a homogeneous, relatively undisturbed, body.
B .There is no fluid motion transverse to the bulk flow direction.
C .Fluid particles swirl around in all directions. Correct

5. Knowing the ECD when pumping a cement slurry up a casing/wellbore annulus is primarily important to preventing ________.

A .lost circulation due to high wellbore pressure at the casing shoe Correct
B .premature setting up of the cement
C .excessive waiting on cement time

6. Rheological models are used to predict _________.

A .mud displacement Correct
B .compressive strength
C .setting time
D .thickening time

7. Identify examples of non-Newtonian flow models. (Select all that apply.)

A .Power Law Correct
B .Bingham Plastic Correct
C .Equivalent circulating density
D .Herschel-Bulkley Correct
E .Reynolds Law

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