Download 7. Plug-Back Cementing PDF

Title7. Plug-Back Cementing
File Size779.4 KB
Total Pages14
Table of Contents
                            Introduction
	Topic Areas
	Learning Objectives
Unit A: Purposes of Plug-Back Cementing
	Plugging to Isolate Zones
	Plugging to Stop Lost Circulation
	Plugging for Directional Drilling
	Plugging for Well Abandonment
	Unit A Quiz
Unit B: Plug-Back Cementing Calculations
	Balanced Plug Cementing
	Example Using Equalization Point Formula
	Balanced Plug Job One  (One Wellbore Geometry)
		Calculations (Drillpipe Out)
			Sacks Of Cement
			Mixing Water
		Calculations (Drillpipe In)
			4  Height of Cement (HOC)
			5  Height of Spacer Ahead (HOS)
			6  Volume of Spacer Behind
			7  Height of Mud
			8  Volume Of Mud Behind (To Balance)
		Working with a Fixed Amount of Spacer
			5  Height of Spacer
			6  Volume of Spacer (Behind Cement)
	Balanced Plug Job Two (Two Wellbore Geometries)
		Calculations (Drill Pipe Out)
			Sacks Of Cement
			Mixing Water
		Calculations (Drillpipe In)
			4  Height of Cement (HOC)
			5  Height of Spacer (HOS)
			6  Volume of Spacer Behind Cement
			7  Height of Mud
			8  Volume of Mud (To Balance)
	Unit B Quiz
Answers to Unit Quizzes
                        
Document Text Contents
Page 1

Section 7

Plug-Back Cementing

Table of Contents
Introduction................................................................................................................................................7-3

Topic Areas ............................................................................................................................................7-3
Learning Objectives ...............................................................................................................................7-3

Unit A: Purposes of Plug-Back Cementing ...............................................................................................7-3
Plugging to Isolate Zones .......................................................................................................................7-3
Plugging to Stop Lost Circulation ..........................................................................................................7-4
Plugging for Directional Drilling ...........................................................................................................7-4
Plugging for Well Abandonment ...........................................................................................................7-5
Unit A Quiz ............................................................................................................................................7-6

Unit B: Plug-Back Cementing Calculations ..............................................................................................7-7
Balanced Plug Cementing ......................................................................................................................7-7
Example Using Equalization Point Formula ..........................................................................................7-8
Balanced Plug Job One (One Wellbore Geometry) ..............................................................................7-9
Balanced Plug Job Two (Two Wellbore Geometries)..........................................................................7-11
Unit B Quiz ..........................................................................................................................................7-13

Answers to Unit Quizzes .........................................................................................................................7-14


7 • 1 Cementing 1

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