The primary objective of casing/liner operations is to successfully run and cement a string of casing/liner capable of meeting the specified pressure test and service requirements. The success of the operations will depend on the following:

  • pre-planning, co-ordination, job execution
  • casing and liner condition
  • pressure tests, calculations and running measurements
  • hole and mud conditions.
  • cement slurry design

Purpose of casing

  • serve as an anchor for the BOP stack thus permitting safe well control of formation pressure
  • Surface casing takes some of the load of the wellhead from the subsequent casing strings
  • Prevents collapse of the upper wellbore during drilling
  • Increases the pressure rating of the hole with respect to higher pressures at greater depth
  • To case off depleted zones
  • Hydraulically isolates the wellbore fluids from the subsurface formations and formations fluids (i.e. time reacting troublesome formations)
  • Minimises damage to both the surface and subsurface environment by the drilling process.
  • Provides a high strength flow conduit for the drilling fluid to surface.

Purpose of Liner

Liners are suspended from the bottom of the previous casing and do not extend to the surface. Thus they are less expensive than a full string of casing.

Drilling Liner

  • isolate troublesome formations to allow further drilling.

Production Liner

  • Set through the production zone
  • Connected to the wellhead using a tie-back casing string when the well is completed
  • Is an economic method of extending casing to the production zone without the running the string back to the surface
  • Use of production liners with the tie-back casing strings results in lower hanging weight in the upper part of the well and are thus more economical.

Monitoring Casing Wear

Ditch Magnets

The metal worn away from the casing and tooljoint is carried by the mud to the shaker header box where it will be attracted to the ditch magnet. Not all the metal particles will be…

Liner running Operations - Best Practices

4.5" Liner Running Checklist

  • Pre-job planning meeting with all key personnel.
  • Refer to Tubular supplier Guidelines.
  • Liner weight and displacement graphs to be prepared.
  • Pip tags to be available prior…

4 1/2" Liner running programme

1. Hold safety meeting with crews before starting running the liner and report in iadc.

2. Make up plug dropping head on drifted single and lay in v door.

Prepare 10m of chicksan lines.

3. Make up and…

Casing Patches

A casing patch can be required in the following situations:

- the casing has to be set high before the casing hanger has landed, (well control requirements may dictate that an emergency slip cannot be…

Weight Set Tie-Back Packer Make-Up

The following procedure should be used when making up a weight set tie-back packer with a 7in liner.

1. PICK UP weight set tie-back packer c/w setting sleeve and PBR 9.5/8in, 43.5-53.5 lbs/ft x 7in…

Casing Centralisation

The centralisation of casing and liners as well as the correct positioning of the centralisers are essential parts of any casing or liner job. The main reason for centralisation is to ensure a…

Casing types definitions

This article presents the definition of the various casing types: conductor, surface casing, intermediate casing, production casing and liner.

Marine Conductor (Offshore)

This is for offshore drilling…

Casing Setting Depths

Casing setting depths found in Drilling Programmes fall into two categories:

1. Those where the casing is set at a specific marker (ie., formation above reservoir).

2. Those where the casing is set at…

Casing and Liner Running Preparation Guidelines.

Preparation for Running Casing and Liner:

1. ENSURE that all casing/liner and associated equipment is delivered to the well site allowing sufficient time for preparation prior to running.


Casing wear and solutions

Casing wear is very important as it effects the system integrity. A casing scheme is designed based on the properties of the chosen casing. Casing wear changes the thickness of casing walls and…

Casing and Liner Handling

This article describes the casing and liner handling guidelines.

Safety Requirements

  • ALWAYS wear gloves and eye protection when cleaning joints
  • EXERCISE CAUTION when rolling casing/liner across racks…

Running and Setting Tie-Back Packer

The following is a procedure example for running and setting a weight set tie-back packer with a 7in liner.

1. Suspend tie-back packer in slips. Make up the running tool on a joint of drillpipe and…

4 1/2" liner running program example

1. Hold safety meeting with crews before starting running the liner and report in iadc.

2. Make up plug dropping head on drifted single and lay in v door.

Prepare 10m of chicksan lines.

3. Make up and…

13.3/8 " Casing Running Programme

1. Voor running casing een veiligheids meeting waarbij alle betrokkenen aanwezig zijn. Vermeldt in Dagelijks rapport.

R/U om casing te runnen.

2. Make up & pipelock shoetrack volgens de running…

Minimising Casing Wear

General guidelines to minimise casing wear include:

  • limiting build up rates
  • deepening kick-off points
  • optimising drillstring design to reduce contact loads or employing suitable hardbanding
  • minimising…

Casing Operations Responsibilities

This article describes the various responsibilities for casing running operations and quality control.

Responsibilities for casing/liner preparation, hole conditioning and mud conditioning prior to…

Tie-Back Packers - General Information

Tie-back packers are generally run in the following circumstances:

- an inflow test has been performed and has failed

- the CBL indicates that a hydrocarbon bearing interval is poorly isolated from…

Casing and Liner Operations Planning

The following planning guidelines shall be adhered to:

  • The casing tally (bottoms up) shall be made listing the pipe as when racked. Casing length shall be casing running length and not total length.…

Example Casing Centralisers Programme

Centraliser programme for vertical and horizontal wells.

Centralizer spacing and float equipment for Vertical wells

Hole Size, in

Casing Size, in

Number of Centralizers

Shoe Track Design


Tie-Back Packers - PBR Clean Out and Packer Setting

The following procedure should be used when cleaning out the PBR for setting a weight set tie-back packer with a 7in liner.

1. RIH combined lower, upper tie-back polish mills and casing scraper.


Casing and Liner Colour Codes

Colour Codes for New Casing/Liner

All new casing shall be colour coded for yield as per API specifications 5CT.

API Casing/Liner Grade Identification Colour Codes

API Grade

Markings On Pipe Body…

Hole Conditioning before Running Casing or Liner

The hole conditioning guidelines described in this article should be adhered to in order to safely and successfully run the casing/ liner into the open hole.

Structural Casing

Driven or pre-installed:…

Liner Lap Testing - Inflow Testing

After running the liner, the liner lap shall be tested to a value based on the FIT at the previous casing shoe. If the test is unsuccessful  then the liner lap must be inflow tested, but if…

Casing Thread Compounds Friction Factors

This article present friction factors for typical Casing Thread Compounds.

Thread Compounds

Friction Factors

Bestolife 270


Houghton Stap Pb6


Houghton Joint No. 1


Running Casing with Weatherford Overdrive system - Best Practices

Rig up checklist

  • Rig down the rig elevator and bails, make sure the iron roughneck has been laid out
  • Remove the saver sub using the pipe handler of the top drive (rig procedure). Check the make-up…

Loadout List for Casing Operations

Loadout lists for 30", 20", 13 3/8", 9 5/8", 7" casing operations

Loadout lists for 30", 20", 13 3/8", 9 5/8" and 7" Casing, 7" and 4 1/2" Liner

Example of loadout lists for 30", 20", 13 3/8", 9 5/8" and 7" Casing,  7" and 4 1/2"…

Mandrel Casing Hangers

This article describes the mandrel casing hanger make-up and running proedures.

Mandrel Casing Hanger Make-up

The “total” hanger will consist of:

  • bottom pupjoint
  • MCH (Mandrel Casing Hanger)
  • top…

Stuck Casing - Remedial Action

In the event the casing string becomes stuck and all attempts to get it free are unsuccessful then , remedial action options shall differ according to the type of wellhead that is being employed and…

Procedure For Running 30” Conductor

Preparation, planning and procedure for running 30" conductor.

Job Preparation

Note: Well must be drilled to depth.  Plan on top 30” conductor pipe being 1.285m down from top of cellar.  Do…

Liner Tie-Back String

A string of casing can be run at a later date after a liner has been installed and joined to it as long as the liner hanger assembly top (or weight set packer top, if it has been run) has been…

Casing and Liner Pressure Testing

The test pressure and the justification for this pressure shall be clearly indicated in the testing programme. The casing string shall be tested to the lowest value as dictated by the following…

7" Liner Operations (Running and Cementing)

1. Hold safety meeting with crews before starting running the liner and report in IADC.

2. Make up plug dropping head on single and lay in v door.

Prepare 10m of chicksan lines.

3. Make up and…

Casing and Liner Running Procedures

1. General Running Procedure

1. Visually check each joint of casing/liner to ensure all joints are clear of foreign matter, measured and drifted.

Note: To prevent foreign matter entering the string…

Casing Make-Up Torque

Casing Make-Up Torque

Due to potential frequent changes to casing specification, casing make-up torque and drift dimensions shall be as per the manufacturer's…