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Historical Review of Dual and Multiple Completions. By Joe Dunn Clegg. History. Early Days (1859 to 1900) Spindletop & East Texas: RRC & Proration After WW II: Commingling & Dual Approval The 1950’s & 60’s: Hard times : Duals + The 1960’s: Computers and Offshore

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Presentation Transcript
history
History
  • Early Days (1859 to 1900)
  • Spindletop & East Texas: RRC & Proration
  • After WW II: Commingling & Dual Approval
  • The 1950’s & 60’s: Hard times : Duals +
  • The 1960’s: Computers and Offshore
  • The Good Years: 1970 to 1984
  • Reality and Profitability
  • Using the Best Technology

Joe Dunn Clegg

multiple zones
Multiple Zones
  • One zone: Only single possible
  • Two or more zones: Development Plan Needed--How best to produce reserves.
  • Aggie approach: Singles & Plug-Back
  • Well for each zone (expensive)
  • Mix of singles, duals, multiples and …..recompletions.

Joe Dunn Clegg

slide4

Multiple Zones

  • Objective: to make more production with less initial costs & less operating expenditures .…make more money
  • Applicable for only limited rates in certain environments….. 2”x 2” for < 1000 bpd x 1000 bpd
  • Avoid large mismatches in depth and pressure ….…D depths < 10%; D gradients < 10%
  • Review potential operating problems/costs
  • Key often a long flowing life
  • Dual artificial lift & workovers usually a problem

$

Joe Dunn Clegg

slide5

Annulus-

Tubing

Dual

for

flowing

wells

Packer

Leakage

Tests?

Joe Dunn Clegg

slide6

Flow Coupling

Cross-over

Packer

Tubing

Flow Coupling

Landing Nipple

Blast Joint

Polished Nipple

Packer

No-Go Nipple

Perforations

Annulus-

Tubing

Dual with

Cross-Over

Joe Dunn Clegg

slide7

Courtesy

Otis

Fad in the 1960’s

Work-Overs?

Secondary Recovery?

Unitization?

Little Operating

Cost Data Available

Joe Dunn Clegg

slide8

Exxon

Special

Multiple

“Tubingless”

Completion

Joe Dunn Clegg

slide9

Concentric

Dual

Completion

Tubing

Upper

Zone

OK for

Flowing

Zones

i.e.

Gas Wells

Lower

Zones

Joe Dunn Clegg

slide10

Dual

Parallel

Gas-Lift

Survived

the test

of time

Joe Dunn Clegg

11

slide11

Dual

Parallel

Gas-Lift

w/concentric

tbg. string

Upper Zone Production

Normal gas injection

Lower Zone

Production

x

Lift Gas

o

12

Joe Dunn Clegg

slide12

x

Proposed Dual

Parallel

Gas-Lift

X

X

9 5/8”Csg

3 1/2” OD Tbg w/

W/Gas

Injection

String

&

1.9” OD Tbg

Special

Crossover

(Hydraulic)

(Permanent)

Joe Dunn Clegg

13

slide13

Three

Tubing

String

Dual

Gas-Lift

Casing Size?

(Hydraulic)

Rigid

<90’

(Hydraulic)

(Permanent)

Joe Dunn Clegg

Outz & Osmus

slide14

Dual Rod Pumping: One Beam Unit

Schematic

Sucker-rod string

Upper Zone Production

Upper Zone Gas

Lower Zone Production

Liquid & Gas

Upper Zone

Lower Zone

Circulating Sleeve

Upper Pump

Seal

Lower Pump

o

Joe Dunn Clegg

slide15

Head to Head

Dual Beam

Rod Pumps

Joe Dunn Clegg

slide16

Triple Beam Rod Pumps

Joe Dunn Clegg

slide18

Dual Hydraulic

Lower Zone

Power Fluid

All Production +

Power Fluid

9 5/8” Csg

Upper Zone

Power Fluid

Commingled

Production

Upper Zone

Lower Zone

Joe Dunn Clegg

slide19

Production lower pump +

all power fluid

Production upper zone

Power fluid for upper pump

UP

Power fluid for lower pump

LP

Dual Hydraulic

Pumping: No vents

Joe Dunn Clegg

slide20

Hypothetical

Dual ESP

Installation

Upper Zone

Pump

Perforations

Packer

Lower Zone Pump

Feasible

but not

Practical

Upper

Zone

o

o

o

o

Lower Zone

Joe Dunn Clegg

slide21

Multilateral Dual

Upper Zone Lateral

Lower Zone Opposed

Multilateral

Joe Dunn Clegg

slide22

Multiple

Completion:

Commingled

Zones

One

Tubing String

Joe Dunn Clegg

my conclusions
My Conclusions
  • Singles or Commingling Preferred
  • Duals are profitable for selected cases
  • Multiples (>2) are seldom justified over well life except for flowing wells
  • Most successful high rate (> 200 BPD) artificial lift: ...Gas Lift
  • Savings on drilling costs are often lost due to higher operating costs, higher workover costs and lost reserves
  • Multiple completions increase stress

Joe Dunn Clegg

slide24

The Winner

Duals Singles Multiples

Flowing Wells

Special Cases

Joe Dunn Clegg