Well Name /Designation

1.  The original name will be set by  the geology or exploration  departement  .There are three categories of well which need to be coded : 
2. Wells with the same Well Head and the Same Target 
3. Wells with the same  Well Head  and Different Targets 
4. Wells with Different Well Heads and the Same Target 

1. WELLS WITH THE ORIGINAL WELL HEAD CO-ORDINATES AND TARGET :

1

      1.1  Vertical Well :

Is defined as having the same well head and target co-ordinates as defined in the well programme . The well code will be : 

Prospect /Field name : Well 

Well Number : 1 

Therefore / number  is : Illustration Line 1 -------Well-1

    1.2. Side Track in a Vertical Well : 

The term Side Track will only be used when there is a mechanical Side Track due to operational problems .If a new hole is drilled due to a operational problem maintaining the same target co-ordinates , this does not alter the well name . 

To permit the identification  of the various side-tracks each is given a number .1 is the original hole , 2 is the first side-track , 3 the second , etc.This is shown in the figure and in the following example : 

            Illustration line 1------- Field name : Well-1 

            Illustration line 2-------1st Side Track : Well-1(hole N° 2) 

            Illustration line 3-------2nd Side Track : Well-1(hole N° 3) 

    1.3.Directional Well : 

Is defined directional  as a well where the target co-ordinates are different from the well head co-ordinates .The well code will be : 

Field name : Well 

Number : 1 

Code :DIR 

So the final well code will be : 

Illustration line 1-------Well -1_DIR 

    1.4.Side Track in Directional Well : 

This is  considered  the same condition as for a vertical well : 

Illustration  line 1--------Original well name /number : Well-1_DIR 

Illustration  line 2--------Side Track : Well-1_DIR (hole n°2) 

    1.5.Horizontal Well : 

Is defined as a well that has a final hole path with a inclination of 90° .

The name will be : 

Field name : Well 

Well number :1 

Extension :OR

Therefore the final well code will be : 

Illustration line 1-------Well-1_OR

Note :  The pilot hole into the reservoir will also be deemed part of the horizontal well . 

    1.6.Side Track in a Horizontal Well : 

This is considered  the same condition as for a vertical well :

Original  well name / number Well-1_OR

Illustration line 2--------Side Track : Well-1_OR(hole n°2)  

2.WELLS WITH THE ORIGINAL WELL HEAD CO-ORDINATES AND DIFFERENT TARGETS

In this category are wells with : 

The original well head co-ordinates with more than one hole and different target co-ordinates. 

Each new hole will be given a new code as will the operations  necessary  to prepare for the side-track (cement plug , casing window operation , etc . ) .

The name of the first hole will have the original code (Well-1) , the follwing  holes will be added to the original code with one of the follwing two additions : The first one indicates the well type : 

• DIR, directional well  
• OR , horizontal well
• APPR, deepened well

The second one indicates  the targets new co-ordinates : 

• A, second target 
• B , third   target 

Example # 1

Illustration line 1, Original well (vertical)--------Well-1

Illustration line 2 , Directional hole --------Well-1_DIR(A)

Illustration line 3, Horizontal hole -------Well-1_OR(B) 

Example  # 2  

Illustration line 1 , Original Directional Well-------Well_DIR 

Illustration line 2 , Directional Well with the second target : Well-1_DIR (A)         

      

           

     

Example  # 3

Illustration line 1 , Original Directional Well -------Well-1_DIR 

Illustration line 2, Vertical well  with a second target -------Well-1(A) 

Example  # 4

Illustration line 1 , Original Vertical Well -------Well-1 

Illustration line 2 , Horizontal hole  with a second target -------Well-1_OR(A)

Illustration line 3, Horizontal hole with a third target --------Well-1_OR(B)

Example  #5

Illustration line 1 , Original Directional Well -------Well-1_DIR 

Illustration line 2 , Directional hole  with a second  new target -------Well-1_DIR (A)

Illustration line 3, Horizontal well  with a third target --------Well-1_OR(B)

       

Example  #6

Illustration line 1 , Original Vertical Well -------Well-1

Illustration line 2 , Directional hole with a second target -------Well-1_DIR (A)

Illustration line 3 , Deepened well with a third target -------Well-1_APPR (B)

Illustration line 4 , Deepened well with a fourth new target -------Well-1_DIRAPPR (C) 

3. WELLS  WITH DIFFERENT WELL HEAD CO-ORDINATES AND SAME ORIGINAL TARGETS 

In this category are the wells where the target co-ordinates remain the same while the wellhead  location has been moved .This condition can only occur where there has been a drilling problem  in the well .

There are two different cases : 

Case 1 

When there is one or more strings of casing set , it can be considered  that every hole is a single well , so the name of the wells after  the first will be the original well plus the code to define the well type (DIR , OR ) with the added code BIS   for the second well , TRIS for the third well , etc .

Example # 1

Illustration line 1 , Original Vertical Well -------Well-1 

Illustration  line 2, Second Well -------Well-1_BIS

Illustration  line 3, Third Well-------Well-1_TRIS

Case 2  (no casing set ) 

When no casing string has been set , it can be considered  that every  hole is part of a single well .The code for the following holes is the original  well plus (1) for the first hole , (2) for the second hole , etc .

Example # 2

Illustration line 1 , Original Well -------Well-1 

Illustration  line 2, Second hole  -------Well-1(2°) 

Illustration  line 3, Third hole  -------Well-1(3°) 

Illustration  line 4, Fourth hole  -------Well-1(4°) 

Illustration  line 5, Fifth hole  -------Well-1(5°) 

Illustration  line 6, Sixth  hole  -------Well-1(6°)