PETROLEUM DEVELOPMENT GEOLOGY WELL TEST

DOWNHOLE TESTING EQUIPMENT Open-Hole Sampling EquipmentRDT & RCI are equivalent with RFT/MDT Baker RCI® Halliburton RDT® Formation Test Tool FTT sample chambers hold 420cc to 3 gallons o

Well Test Objectives

1 Identify and Obtain reservoir fluids; oil, gas

& water

2 Determine basic reservoir parametes;

productivity (PI), permeability(k), skin (S), initial Resv Pressure (P*) & Resv Temp.

3 Well potential & deliverability (gas well) : It

may be mandatory to proof field

commerciality

4 Boundary & irregular conditions Reservoir

(GOC, OWC & Reservoir Limit)

WELL TESTING METHODS

– OPEN HOLE

– CASED HOLE

– WIRELINE TESTING : RFT, MDT & DST (IT WAS)

– PRODUCTION TEST WITH COMPLETION STRING

IN PLACE : DST

Surface Test Equipment

Subsea Safety Equipment

DOWNHOLE TESTING EQUIPMENT Open-Hole Sampling Equipment

RDT & RCI are equivalent with RFT/MDT

Baker RCI®

Halliburton RDT®

Formation Test Tool (FTT) sample chambers hold 420cc to 3 gallons of reservoir fluid depending on make and

model.

Open hole samples aid production and facility designs and are sometimes used

for PVT studies.

1 ST GENERATION

RFT

REPEATED FORMATION TESTER

- unlimited pressure survey

- unlimited pressure survey

- many fluid sampling (unlimited?)

- able to identify fluid type

- able to replace(pump out)

unrequired fluid sample

SCHLUMBERGER

DOWNHOLE TESTING

EQUIPMENT

RFT / MDT

Mud pressure

Reservoir pressure

Build-up pressure

Example RFT Record

• To identify the reservoir

pressure

• To identify the fluid content

• To estimate the permeability

• To estimate the productifity

• To define the fluid contact (OWC,

OGC and GWC if any)

Fluid Contact Determination with fluid gradient from RFT

oil

water

RFT depth

W ate

r G ra die

nt 0.4

33 p si/ ft

t 0 3 6 7 p s i/f t

OWC

• Clean up (flow)

• Shut-in

• Main flow (one period or flow-after-flow, flowing test with 4 to 5 different choke size)

• Main Build –up (shut-in)

Selective Layer Testing

Example : Pressure Testing Result

Build up data analysis

THE ROLE of WELLSITE/DEVELOPMENT GEOLOGIST (DG)

DG Propose/selects the testing/perforation sand, interval and depth

Estimate the reservoir fluid contents and it’s static pressure

Provide the reservoir rock parameter for testing analysis such as lithology, porosity

and permeability if any (from log, or qualitative)

Stop the testing when unsafe operation Testing Engineer (TE) decision

Decide testing duration TE decide flow & shut-in periods TE also

selects choke size for flow testing.

Select taken fluid sample TE decide fluid sampling methods And

responsible for fluid sample handling

As Operation Witness will validate &

analyse the result

TE is prime Operation Witness and will validate & analyse the testing result.

DG & TE will be along selecting the

perforation method

Hyperjet/HSD(high shot density)

3 TCP (Tubing Conveyed Perforation)

1 Define the perforation intervals at

porous zone & hydrocarbon zone

(pay zone.

design such as gun type, size, SPF

(shot per ft), Spacing (angle between

two shots), charge/explosive type;

penetration deep and entrance hole.

in the hole); using mud or brine

water or special completion fluid,

under/over balance.

shooting result (whether all charges

PERF At Net pay