C1 wellbore completion concepts

Designed & Presented by

Mr. ĐỖ QUANG KHÁNH, HCMUT

12/2010

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

1


 Completions: the interface between the reservoir and

surface production.
 The role of the completion designer: to take a well
that has been drilled and convert it into a safe and
efficient production or injection conduit.

 Completion design: a mix of physics, chemistry,
math., eng., geo., hydraulics, material science and
practical hands-on wellsite experience. => to balance
the theoretical with the practical.
12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

2

 In the development of a hydrocarbon reservoir, a large

number of wells are drilled and require to be
completed, to allow the structure to be depleted.
However, the drilling and completion operations are
crucial to the long term viability of the wells in
meeting the specified objectives.

 The design and completion of both production and
injection wells are required to satisfy a number of
objectives including:
12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

3


1. Provision of opt. production/injection performance.
2. Ensure safety.
3. Maximise the integrity and reliability of the completion over the

envisaged life of the completed well
4. Minimise the total costs per unit volume of fluid produced or
injected, i.e. minimise the costs of initial completion, maintaining
production and remedial measures.

 Depending upon the reservoir characteristics or
development constraints, the completion may be required

to fulfil other criteria, e.g. to control sand production.
12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

4


 The design of a completion can therefore be assumed

to proceed concurrently at two different levels. The
initial intention would be to produce a conceptual design, or a
series of alternatives. From these conceptual designs, one or
more would be selected for more detailed development.

=> a detailed design process would be pursued with
the intention of producing a completion string design
which specifies all components and also assesses the sensitivity of
the well and completion performance to variations in the reservoir
data used for the design.
12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

5


 The fundamental design of a completion consists of

four principal decision areas, namely:
1. Specification of the bottom hole completion technique.
2. Selection of the production conduit.

3. Assessment of completion string facilities.
4. Evaluation of well performance / productivityinjectivity

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

6


 Completion Design Strategy

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

7


 Team integration

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Đỗ Quang Khánh – HoChiMinh City University of Technology
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8


 Data sources for completion design

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

9


 Economic influence of completions.

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

10


12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

11


 Statement of requirements (SOR):

• Pulling together the data the will be incorporated into
design.
• Incorporate reservoir and production data and an

expectation of what completion needs to achieve over
the life of the field.

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

12


 Basis of design:

• Outlines the main decisions made in the completion
design & their justification.
• Forms the basis designed of reviews by colleagues,

internal or external specialists & vendors.
• Includes the basic installation steps & design risk
assessments.

• Includes major decisions s.a the requirement for sand

control, stimulation, tubing size & artificial lift
12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

13


 Completion procedures

• Installation procedures are reviewed and agreed by all
parties involved.
• Reviews and issuing procedures should precede

mobilization of equipment and personnel.

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

14


 Post-completion report
• Reports well status in detailed.

• Reports results and lessons learnt.
• Includes a detailed schematic (with serial numbers,

equip specifications, dimensions and depths), a tubing
tally, pressure test details and plots, summaries of
vendor reports, etc.
=>This document is critical for any engineer planning a

later well intervention.
12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

15


 Wells can be producers or injectors.
•

can produce oil, gas and water.

•

can inject hydrocarbon gas, water, steam and waste products

•

can be combined either simultaneously (e.g. produce the tubing
and inject down the annulus) or sequentially (produce

hydrocarbons and then convert to water injection duty).

 Completions are often divided into:
•

reservoir completion (connection between reservoir & well) and

•

upper completion (conduit from reservoir completion to surface
facilities).

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

16


 Major decisions in the reservoir completion are:
•

Well trajectory and inclination

•

Open hole vs. cased hole

•

Sand control requirement and type of sand control

•

Stimulation (proppant or acid)

•

Single or multi-zone (commingle or selective)

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

17


 Reservoir completion methods

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
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18


 Major decisions in the upper completion are

•

Artificial lift and type (gas lift, electrical pump, etc.)

•

Tubing size

•

Single or dual completion

•

Tubing isolation or not (packer or equivalent)

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
Email: or

19


 Upper completion methods

12/2013

Đỗ Quang Khánh – HoChiMinh City University of Technology
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