Modern

Well Stimulation

Methods

Prof. Anatoly Zolotukhin

Part II - Well completion design

Syllabus

Selecting drainage strategy and well placement system (6 hours)

Well completion design (6 hours)

–Well perforation

–Sand control

–Gravel pack

Well stimulation methods (8 hours)

–Acid washing and matrix acidizing

–Hydraulic fracturing

–Horizontal drilling

Well productivity estimating methods (8 hours)

–Productivity of a well with arbitrary trajectory

–Well interference

Final test (exam, 2 hours)

Part II - Well completion design

Part II

Well completion design

Part II - Well completion design

3

Well completion design

Ideal completion means the lowest cost completion (i.e. initial and operating cost) that meets or nearly meets the demands placed upon it for most of its life

Part II - Well completion design

4

Factors influencing well completion design

Production rate – a starting point for WCD

Multiple reservoirs

–Multiple completion inside casing, several strings or smaller casing cemented in one borehole, different types of multilateral wells, commingled production, etc.

Recovery drive mechanism

–Secondary recovery methods – selective injection/production interval should be considered

Well stimulation

–May require zonal isolation

Sand control

Part II - Well completion design

5

From the mechanical consideration point of view WCD should:

Maximize profit

Keep the installation simple

Ensure an overall reliability and safety

Anticipate all operation conditions

Part II - Well completion design

6

Well Completion

Single completion. Open borehole

Part II - Well completion design

7

Well Completion

Single completion. Production tubing

Part II - Well completion design

8

Well Completion

Single completion with single packer and string

Part II - Well completion design

9

Well Completion

Dual completion with single packer and single string

Part II - Well completion design

10

Well Completion

Parallel dual completion with two packers and two tubing strings

Part II - Well completion design

11

Well Completion

Triple completion with two or three packers and two or three tubing strings

Part II - Well completion design

12

Well Completion

Effect of Tubing and Packer on Pressure Gradient in Well

Part II - Well completion design

13

Well Completion

Multiple tubingless completion

Part II - Well completion design

14

Well Completion

Completion techniques used for horizontal wells

Part II - Well completion design

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Well Completion Design

Artificial lift position

Multilateral junction node point

Liner pressure drop

Inflow Performance

(lateral 1)

Liner pressure drop

Inflow Performance

(lateral 2)

Part II - Well completion design

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Well Completion Design

a)

b)

c)

d)

Part II - Well completion design

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Well Completion Design

e)

f)

g)

h)

i)

j)

Part II - Well completion design

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Well Completion

Design

Remote

Telemetry System

Wellhead

Downhole

Control

Valves with

Integral Sensors

Hard Wired

Downhole

Telemetry

System

Part II - Well completion design

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Shale gas production technology

Technology

Wells are drilled vertically into the shale formations and then 500 – 1500 meters horizontally through them

The next step is to fracture the rock

After perforating the lower end of the production liner the well is filled with water and sand

The shale is then fractrured by pumping the water + sand into it under high pressure

Source: Marcellus shale gas production, Statoil, 2010

September 21, 2013	PetParoleumtII - WellPolicycompletionand Operations,design	20
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