Well Completion Types Essay

2445 words - 10 pages

Well Completions  Well Completions

Completion ‐ Completion Definition
• • After a well is drilled and the hydrocarbon bearing reservoirs have been  After a well is drilled and the hydrocarbon bearing reservoirs have been established, it needs to be completed to allow the hydrocarbons to flow  from the reservoir to surface. Completions are the interface between the reservoir and surface  Completions are the interface between the reservoir and surface production. The role of the completion designer is to take a well that has  been drilled and convert it into a safe and efficient production or injection  conduit. The ideal completion is the lowest cost completion (considering initial and  ...view middle of the document...

• Many of the simpler multilateral systems use open hole reservoir  techniques. • The Open hole completions find application in competent The Open hole completions find application in competent  formations – especially naturally fractured limestones and  dolomites.

Open Hole Completion Open Hole Completion
Advantages of open hole completion Ad antages of open hole completion • Adaptable to special drilling techniques to minimize formation  damage or to prevent lost circulation into the producing zone. • With gravel pack provides excellent sand control method where  productivity is important. • No perforating expenses and saving of rig time. p g p g g • Log interpretation is not critical since entire interval is open. • Full hole diameter is available to flow. • Can be easily deepened Can be easily deepened. • Easily converted to liner or perforated completion. • Facilitates ultra short radius multiple radial completion.

Open Hole Completion Open Hole Completion
Limitations of Open Hole Completion Li it ti fO H l C l ti • Excessive gas or water production difficult to control. • Difficult to selectively stimulate producing interval Difficult to selectively stimulate producing interval. • Difficult to fracture selectively. • Casing set “in the dark” before the pay zone is drilled  Casing set  in the dark before the pay zone is drilled or logged. • Require more rig time on completion. q g p • May require frequent cleanout. • No way to regulate fluid flow from or into well bore. y g • Subsequent cased hole completion will restrict well  bore and completion string diameter.

Open Hole Completion Open Hole Completion

a – Open Hole Completion Open Hole Completion b – Open hole with slotted liner

Complex open hole  p p with multi‐laterals

Open Hole Completion Open Hole Completion

Long Horizontal Section completed Open Hole

Cased Hole Completion Cased Hole Completion
In the cased and perforated completion, Casing is set into or through the  I th d d f t d l ti C i i ti t th h th producing formation and cemented. The casing is then perforated to  provide communication between the well bore and formation. • Ad t Advantages of the Cased Hole Completion f th C d H l C l ti
– Ease of selective completion and work over operation in the producing  intervals. – C Can effectively control gas and water producing by selectively  ff i l l d d i b l i l perforating and isolating. – Can effectively control and monitor zonal fluid production. – P Permits multiple completions. it lti l l ti – Can stimulate selectively. – Can fracture selectively. – DST’s Logs and formations samples provided information on casing  setting depth or abandon. – Can be deepened, but with smaller hole. – Can be adopted to sand control, selectively, both as pre‐pack or  conventional gravel pack.

Cased Hole Completion Cased Hole Completion
Limitations of the Cased Hole and Perforated  Li i i f h C dH l dP f d Completions
– Long interval perforation can be...

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