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ATMPETE 689 UBDATM

ATM ATM

Lesson 17

Flow Drilling

Mudcap Drilling

Snub Drilling

Closed SystemsRead: UDM Chapter 2.8-2.11

pages 2.180-2.219

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Flow Drilling

Flow drilling refers to drilling operations in

which the well is allowed to flow to surface

while drilling.

All UBD operations are really flow drilling

operations, but the term is usually applied to

drilling with a single phase mud, and no gasis injected except by the formation.

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Petroleum Engineering

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Petroleum Engineering

Drilling fluid selection

Density is determined by:

maximum pressure

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Surface Equipment

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Surface

Equipment

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ATM ATMHarold Vance Department of

Petroleum Engineering

Surface Equipment - RBOP

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ATM ATMHarold Vance Department of

Petroleum Engineering

Surface Equipment - RBOP

sealing element

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ATM ATMHarold Vance Department of

Petroleum Engineering

Surface Equipment

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ATM ATMHarold Vance Department of

Petroleum Engineering

Sizing Flare line

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ATM ATMHarold Vance Department of

Petroleum Engineering

Sizing Flare line

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ATM ATMHarold Vance Department of

Petroleum Engineering

Sizing Flare line

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ATM ATMHarold Vance Department of

Petroleum Engineering

Sizing Flare line

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Surface Pits

Primary Oil Separation Pit

Secondary Oil Separation Pit

Skimmer System Safety

Drilling Fluid Pit

Oil Transfer Tank

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Operating Procedures

Mechanical objective is to control the well

at the surface to maintain underbalanced

conditions. Maximum tolerable surfaces pressures

should be established before drilling starts.

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Mudcap Drilling

Utilized with uncontrollable loss of

circulation during flowdrilling operations.

Higher pressures than can be safely handledwith the rotating head or RBOP.

Not necessarily underbalanced.

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Mudcap Drilling

Driller loads the annulus with a relatively

high density high viscosity mud and closes

the choke with surface pressure maintained Drilling is then continued blind by

pumping a clear non-damaging fluid down

the drillstring through the bit and into thethief zone.

TPETE 689 UBDT

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Mudcap Drilling

Applications:

Sustained surface pressures in excess of 2000

psiSour oil and gas production

Small diameter wellbores

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Mudcap drilling

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ATM ATMHarold Vance Department of

Petroleum Engineering

TPETE 689 UBDT

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ATM ATMHarold Vance Department of

Petroleum Engineering

Fluid Volume Requirements

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ATM ATMHarold Vance Department of

Petroleum Engineering

Fluid Volume Requirements

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ATMPETE 689 UBDATM

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Petroleum Engineering

Fluid Volume Requirements

Annular volumes will depend upon whether

the operator desires continuous or periodic

injection of annular fluids or whether afloating mudcap is to be used.

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ATM ATMHarold Vance Department of

Petroleum Engineering

Fluid Volume Requirements

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Fluid Volume Requirements

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Fluid Volume Requirements

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department of

Petroleum Engineering

Snub Drilling

UBD operation utilizing a snubbing unit or

coiled tubing unit.

Expense is justifiable if very high formationpressures are anticipated, and uncontrollable

loss of circulation is expected.

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Petroleum Engineering

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ATM ATMHarold Vance Department of

Petroleum Engineering

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ATM ATMHarold Vance Department ofPetroleum Engineering

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ATM ATMHarold Vance Department ofPetroleum Engineering

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ATM ATMHarold Vance Department ofPetroleum Engineering

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ATM ATMHarold Vance Department ofPetroleum Engineering

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department ofPetroleum Engineering

Closed Systems

Refers to UBD operations with a specific

surface system.

A pressurized, four phase separator and afully closed surface system, is used to

handle the returned fluids.

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department ofPetroleum Engineering

ATMPETE 689 UBDATM

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department ofPetroleum Engineering

Fig. 2.70

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department ofPetroleum Engineering

Fig. 2.71

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ATMPETE 689 UBDATM

ATM ATMHarold Vance Department ofPetroleum Engineering

Fig. 2.72

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