1. What is Completion?
Completions are the interface between the reservoir and surface production. To convert
a well that has been drilled into a safe and efficient production or injection conduit.
OpenHole completion well may be producing through casing.
Completion is a part of well control envelope and remain so through the life of a well.
Wc = Fm+Oₓ+Tq+R+Rg+[∫ 𝐹(
𝑡=𝑛
𝑡=0
∑Activities)]
Wc = Fm+Oₓ+Tq+R+Rg+ [∫ ∑ ∇𝐴𝑖ₐ𝑡=𝑛
𝑡=0 + ∑ ∇𝐴𝑖ₐ₁ +𝑡=𝑛
𝑡=0 …+ m + n
𝑡=𝑛
𝑡=0
)]
∫ 𝐹(
𝑡=𝑛
𝑡=0
∑Activities) = (∫ ∑ ∇𝐴𝑖ₐ𝑡=𝑚ₐ
𝑡=0 + ∑ ∇𝐴𝑖ₐₓ +𝑡=𝑚ₐ₊₅
𝑡=𝑚ₐ₊₁ … …+ m + n
𝑡=𝑛
𝑡=0
t = 0+1+2+3+……+m+n
Where m< = n
∆Ai = Change in Activities such as Initial completion ->Production->Well Intervention->
Workover-> Abandonment (final stage in well life cycle). For each change in a well cycle
there will be an addition of ∇𝐴𝑖.
𝑖ₐ= Primary completion/Prod/WI/WO/Abandonment.
𝐴𝑖ₐ = All the other activities on the wellbore in succession of primary completions.
t=0 beginning of the activity, t=n end stage of the completion activities cycle
(Abandonment).
Wc = Segment of wellbore being completed,
t= Time from 0 to n period (completion activities duration),
Fm = Formation Evaluation,
Oₓ = Optimizing Well Spacing
Tq = Completion Techniques (Decision on commingling/multiple/single/OpenHole
completion is the outcome of formation evaluation (Fm),
A = Set of activities,
Activities = F(Completion objective),
R = Rig type, R = F(Completion Technique) i.e. R=F(T),
Rg = Regulatory submission
*Activities to be performed as per completion program
2. Various completions attributes/activities correlate to the above functional relationship
such as:
Ø Formation Evaluation
Ø Optimizing well spacing
Ø Completions Techniques
Ø Cost/AFE
Ø Rig type
Ø Milling
Ø Plugbacks (Intervals)
Ø Treatments (Intervals)
Ø Stimulation (contact intervals)
Ø Perforations (contact intervals)
Ø Setting in wellbore equipment such as production tubing, coil tubing etc.
Ø Setting up wellhead/Production tree/Christmas tree for the product to flow through
the pipeline.
Ø Production testing
Ø Regulatory reporting
Ø Safety
Ø Environmental (Energy used, venting, flaring etc.)
Ø Others
![What is Completion?
Completions are the interface between the reservoir and surface production. To convert
a well that has been drilled into a safe and efficient production or injection conduit.
OpenHole completion well may be producing through casing.
Completion is a part of well control envelope and remain so through the life of a well.
Wc = Fm+Oₓ+Tq+R+Rg+[∫ 𝐹(
𝑡=𝑛
𝑡=0
∑Activities)]
Wc = Fm+Oₓ+Tq+R+Rg+ [∫ ∑ ∇𝐴𝑖ₐ𝑡=𝑛
𝑡=0 + ∑ ∇𝐴𝑖ₐ₁ +𝑡=𝑛
𝑡=0 …+ m + n
𝑡=𝑛
𝑡=0
)]
∫ 𝐹(
𝑡=𝑛
𝑡=0
∑Activities) = (∫ ∑ ∇𝐴𝑖ₐ𝑡=𝑚ₐ
𝑡=0 + ∑ ∇𝐴𝑖ₐₓ +𝑡=𝑚ₐ₊₅
𝑡=𝑚ₐ₊₁ … …+ m + n
𝑡=𝑛
𝑡=0
t = 0+1+2+3+……+m+n
Where m< = n
∆Ai = Change in Activities such as Initial completion ->Production->Well Intervention->
Workover-> Abandonment (final stage in well life cycle). For each change in a well cycle
there will be an addition of ∇𝐴𝑖.
𝑖ₐ= Primary completion/Prod/WI/WO/Abandonment.
𝐴𝑖ₐ = All the other activities on the wellbore in succession of primary completions.
t=0 beginning of the activity, t=n end stage of the completion activities cycle
(Abandonment).
Wc = Segment of wellbore being completed,
t= Time from 0 to n period (completion activities duration),
Fm = Formation Evaluation,
Oₓ = Optimizing Well Spacing
Tq = Completion Techniques (Decision on commingling/multiple/single/OpenHole
completion is the outcome of formation evaluation (Fm),
A = Set of activities,
Activities = F(Completion objective),
R = Rig type, R = F(Completion Technique) i.e. R=F(T),
Rg = Regulatory submission
*Activities to be performed as per completion program](https://image.slidesharecdn.com/4fcca4f7-ebfd-41f5-8f73-cd7b7f04c3fe-160901133412/85/What-is-completion-1-320.jpg)
