Drilling and Completion Drilling Equipment

Drilling and Completion

Drilling and Completion Drilling Equipment


...CONTENTS...



Functions of casing



Drilling and Completion Drilling Equipment

Types of Strings of Casing



 DRIVE PIPE


 CONDUCTOR PIPE

A short string of casing  of a large dimeter which is normally the first casing string to be run in the hole

 Surface Casing

A string of casing set in a wellbore to case off any freshwater sands at shallow depths and it set below the conductor pipe 

 Intermediate Casing

A string of casing set in the borehole to prevent the hole from caving and seal off a formation

 Production Casing

A casing string which used as a production tubing to run  complete the well for production

Liners

A string of casing which placed at which awell is to be drilled and used to save the money of drilling


Example Hole and String Sizes


Casing in an exploration well


Casing in development well



Running the casing


Casing Collar

Test BOP System

Installing the Casing

Hanger

Making perforation

Running production tubing


 Casing Accessories


Guide show

is used to guide the csg through doglegs and restriction in the hole and to protect lower edge of the csg

Float shoe

Guide show contains valve element(ballor flapper )prevents cement from flowing back into csg

Casing shoes (reaming type
shoe)

Casing shoe (Directional type
nose)

Float collars

one way valve placed at one or two joints above the shoe prevents mud from entering

the csg while it is being lowered inside and cement from flowing back into csg

centralizers



advice run around the casing which is designed to support and centralize the casing in deviated wellbores

هى عباره عن اداه تستخدم لجعل ماسوره الحفر فى مركز الحفره حيث تساعد drill string على عدم الانحراف يمين او يسار اثناء عمليه الحفر

Scratcher

advice fastened to the outside of the casing which removes mud cake and the promote a good cement job

هى عباره عن اداه تستخدم لتنظيف البئر من خارج ال casing عن طريق ازاله mud cake اثناء عمليه ال cementing وذالك لعمل روابط جيده بين ال cement وwellbore well


selection of casing setting depths


Fracture gradient Definitionand importance


The forces affecting on the casing



external force

Which result from an external pressure which tends to collapse the casing

internal force

Which result from an internal pressure which tends to burst the casing

Longitudinal or axial loading

Axial loading my be tension due to dead load or compression due to buoyancy

Classification of CSG

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